BUILD YOUR OWN

SAYEL lYE TV ANTENNA

luild amusical horn for your car
liuilal audio from your VCR
IHF prescaler for your counler
THE INCREDIBLE
SHRINKING IC
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49
175
299
229
159
79
45
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35
S 298
Guaranteed ShiDment
Cleveland GonsLmer Corr4Juters ~ Corropcnlnts
guarantees shipment of ClJl11)Uter systems
within 4S hoursupon receipt of your order.
Our ,.nure to ship within 48 houre
.n1:iti.. you to US of eoftwsre. FREE.
To Order: Or to get our free catalog CALL 1-B000321-5805 TOLL FREE. Charge your
order to your VISA or MASTER CHARGE account. Ohio residents call: [216] 464-B0217.
Or write, including your check or money order, to the address listed below.
Freight Policies Al crders of $1oo or more are
shipped treightprepaid. Orders of less thanili100 pleaseadd
$4.00 to cover shppirg costs. ohio residents add 5,5% Sales Tax.
~ .
Hours: Call Monday thru Friday.
VISA" S:OOAM to 5:00 PM ED.T,
TOLL FREE: 1-800-321-5805

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Look at these easy hardware prices:
610 Board For use with Superboard II and Challenger 1P.
8K static RAM. Expandable to 24K or 32K system total.
Accepts up to two mini-floppy disk drives. Requires +5V
@4 .5 amps. -
Mini-Floppy Disk Drive Includes Ohio Scientific's PICODOS
software and connector cable. Compatible with 610
expander board. Requires +12V @1 .5 amps and +5V @
0.7 amps. [Power supply & cabinet not included.)
630 Board Contact us for important details.
AC-3P 12" combination black and white TV/video monitor.
4KP 4K RAM chip set .
PS-005 5V 4.5 amp power supply for Superboard II.
PS-003 12V power supply for mini-floppies.
RF Modulator Battery powered UHF Unit .
CS-900B Metal case for single floppy disk drive and power
supply. [While stock lasts.)
AC-12P Wireless remote control system. Includescontrol
console, two lamp modules and two appliance modules, for
use with 630 board.
AC-17P Home security system. Includesconsole, fire
detector, window protection devices and door unit for use
with 630 board. 249
C1P Sams C1P Service manual 8
C4P Sams C4P Service manual 16
C3 Sams Challenger III manual 40
Ohio Scientific and independent suppliers offer hundreds of programs for the
Superboard II, in cassette and mini-floppy form.
Ohio Scientific
Superboard II
5299
"The Superboard II is an excellent
choice for the per-senal computer
enthusiast on a budget."
-BYTE, MAY 1979
It's the first complete computer
system on a board.
Superboard II uses the ultra
powerful 6502 Microprocessor
8K Microsoft BASIC-in-ROM
4K static RAM on board,
expandable to 8K
Full 53-key keyboard, with upper
and lower case. Plus user
expandability.
Video interface and audio
cassette interface.
The Ohio Scientific Superboard II at
$299 - in today's economy - has
got to be the best buy by far. It will
entertain you with spectacular
graphics made possible by its ultra
high resolution graphics and super
fast BASIC. It will help you in school
or industry, as an ultra powerful
scientific calculator. Advanced
scientific functions and a built-in
" immediate" mode allowyou to
solve complex problems without
programming .
The Superboard II can be
expanded economically, for business
uses, or to remotely control your
home appliances and security. Even
communicate with other computers.
Read what's been written
about Superboard II:
"We heartily recommend Super-
board II for the beginner who wants
to get into microcomputers with a
minimum cost. A real computer
with full expandability."
-POPULAR ELECTRONICS, MARCH 1979
II dCLEVELAND CONSUMER
J i i I ~ COMPUTERS & COMPONENTS
P.o. Box 46627
Cleveland, Ohio 44146 .
~ - - - - - - - - - - - - - - - - ~
I
Order Form
- CLEVELAND CONSUMER P.O. Box 46627 I
_ COMPUTERS & COMPONENTS Cleveland, Ohio 44146
I 0 Superboard II $299. 0 RFModulator $35. I
o 610 Board $298. 0 AC-3P 12" BIW Monitor $159.
I 0 Mini-Roppy Disk Drive $299. 0 C1P Sams Manual $8. I
I
[Attach separate sheet for other items .)
NAME
I ADDRESS: I
I
CITY: STATE: ZIP: I
PHONE:
I Payment by: VISA __MASTER CHARGE --MONEY ORDER -- I
I Credit Card Account # I
I
Expires Interbank #[Master Charge) ~
TOTAL CHARGED ORENCLOSED s [Ohio Residents add 6.5 % Sales Tax] I ~
L
arders of less than $ 100, please add $4.00 to cover shippingcosts , Orders will be accepted from U.S. and R en
Canada only. All prices quoted are U.S. date of publication, stendard UPS shipping FOS the factory . ~ - l
._------------ - - - - - - - - - - - - - - - - - ~
...
CIRCLE 9 ON FREE INFORMATION CARD
1
The more
logicalwayto look
insidean Ie
Suggested U.S. resale. Available at select ed local dis tribut ors. Prices, specifications subj ect to change without not ice.
<0 Copyright 1980Global SpecialtiesCorporation.
CIRCLE 38 ON FREE INFORMATION CARD
Our 23-oz. Logical Analysis Test Kits include
Logic Probe, Digital Pulser, Logic Monitor, complete
manuals and accessories, plus case.
LTC Logical Analysis Test Kits:
everything you need for over
90% of your digital testing.
Everything you need is at your finger-
tips. Circuit-powered . And easy to use.
Ready to read logic activity at a glance,
poi nt-by-point or IC by IC. Or to inject digital
signals for test ing.
Let the LEOs of our Probes, Pulsers and
Logic Monitors light the way to answers for your
troubleshooting, design and educational needs .
The Logical Analysis Test Kit comes in two
versions: our $270.00* High-Speed Kit, LTC-2,
which captures pulses as narrow as 6 nsec, rep
rates to 60 MHz; and our $240.00* Standard Kit,
LTC-1 , which goes to 50 nsec , 10 MHz. Both
include complete manuals , accessories and a
compact, custom-molded case. Either way,
you've got a strong case for simp lified
digit al testing.
Smarter tools for
testing and design.
GLOBAL
SPECIALTIES
CORPORATION
70FultonTerr. NewHaven, CT 06509 (203)624-3103, TWX710-465-1227
OTHER OFFICES: San Francisco(415) 648-0611 , TWX910-372-7992
Europe: Phone Saffron-Walden 0799-21682, TLX817477
Canada: Len Finkler Ltd., Oownsview, Ontario
Call toll -free for details 1-800-243-6077
lillliD-
Elealranla..
Electronics publishers since 1908
THE MAGAZINE FOR NEW
IDEAS IN ELECTRONICS
AUGUST 1981 Vol. 52 No. 8
TECHNOLOGY 4 LOOKING AHEAD
Tomorrow's news today. David Lachenbruch
22 SATELLITE TV NEWS
The latest happenings in an excit ing new industry.
Gary H. Arlen
61 SOLID-STATE MICROWAVE DEVICES
How semiconductors can be made to oscillate in the
gigahertz (1000-MHz) range. Joseph J. Carr
70 HOBBY CORNER
Some answers, some questions, and some useful
information. Earl " Doc" Savage, K4SDS
72 NEW IDEAS
A pri ze-winning application from a reader.
VIDEO 73 SERVICE QUESTIONS
R-E's Service Editor solves technicians' probl ems.
SPECIAL FEATURE
BUILD THIS
AUDIO
EQUIPMENT
REPORTS
41 THE INCREDIBLE SHRINKING IC
A short history of int egrated ci rcuit s. and a look at
their futur e. Bonaventura Antony Paturzo
45 SATELLITE TV ANTENNA
The 8-8all-a satellite TV antenna you can bui ld
for under $750. H.D. McCullough
49 SYNTHESIZED RF GENERATOR
The Programma-2 covers a range of 300 kHz to 30 MHz and
costs about $3100 less than its commercial counter-
parts. Gary McClellan
53 ELECTRONIC MUSICAL HORN
Don't blow your horn in traffic-play it!
Fred Blechman and David McDonald
57 $60 MODEM
Part 3-The conclusion of this art icle presents the software
your computer will need to use the modem. Robert Ward.
64 UHF PRESCALER
Extend the range of your frequency counter up to
650 MHz. Bill Owen
67 DIGITAL AUDIO FROM YOUR VCR
At last you can do digital record ing at home. Here's a
description of how audi o information is stored in a
"v ideo" format. Leonard Feldman
28 Non-Linear Systems Touch Test 20 DMM
30 BBC-Metrawatt-Goerz Model MA1H VOM
30 Heathkit Model IM-2400 Frequency Counter
31 Radio Shack Model PRO-2002 Programmable Scanner
32 Kantronlcs Mini-Reader Morse Code and RTTY Decoder
RadiO-Elect ronics, (ISSN0033-7862) Publish ed monthly
by Gernb ack Publi cati ons, Inc" 200 Park Avenue South,
New York. NY 10003. Second-Class Postage Paid at
New York.. N.Y. and additional maili ng off ices. One-year
subscr ipti on rate: U.S.A. and U.S. possessions. $13.00,
Canada, $16.00. Ot her count ries. $20.50. Single copies
$1.25. 1981 by Gernsback Publi cations, Inc. All rights
reserved. Printed in U.S.A.
DEPARTMENTS
16 Advertising and Sales Off ices
110 Advertising Index
82 Computer Market Center
16 Editorial
111 Free Information Card
24 Lett ers
79 Market Center
74 New Products
6 What 's News
Subscription Service: Mail all subscr ipt ion orders .
changes, corr espond ence and Postmaster Noti ces of
unde livered copi es (Form 3579) to Radio-Electr onics
Subscript ion Service, Box 2520. Boul der, CO 80322.
A stamped self-addressed envelope must accompany
all submitted manuscri pt s and/or artwork or photo-
graphs if their return is desired should they be rejected .
We dis claim any responsibili ty for the loss or damage of
manu scripts and/or artwor k or phot ographs while in
our possession or otherwise.

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As a service to readers, Radio-El ectronics publi shes avail able plans or information relat ing to newsworthy products, techniques and scient if ic and technological developments. ~
Because of possible var iances in the qualit y and cond ition of materi als and workmanship used by readers, Radio-Electronics discl aims any respons ibility for the safe and proper (0
functioning of reader-built proj ect s based upon or from plans or Informati on publi shed in this magazine. ~
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BETA'S
COMEBACK
PROJECTION
MARCHES ON
CATALOG ON
DISC
It' s no secret that the Beta home VCR format has been taking a clobbering from VHS at the
marketplace. A slight Beta comeback began in late 1980, and now a new series of recorders may
lead to a more complete reversal of the situati on. Sony has redesigned its recorder s from the
ground up-c-changing , miniaturizing, and producin g a complete new look that trul y capitalizes
on the smaller size of the Beta cassette.
The first of the new Beta' s is the new 9'l2-pound port able described here last month , to be.
introduced in the U.S. by both Sony and Zenith. The second, containing many of the features of
the port able, is a new AC home unit that is just over three inches high and has the appearance of
a fine hi-fi component. The old cassette-l oading elevator has been replaced by a slot in the front,
and the comple x series of belt drives by six tiny motors. The reel-drive motor is so small that it
fits into the spindle. The home unit, less than half the size of its predecessor, is programmable
for two weeks (four channel changes) and contains a wide variety of special effects, with all
function s controlled by an infrared wireless remote unit.
One of the unit' s striking features is a multi -purpose fluorescent display panel, that shows the
time when the unit is turned off. When it' s turned on, it replaces the traditional tape counter
with a display showing elapsed playing time in minut es and seconds, activated by counting sync
pulses electronicall y. The panel is also used for sett ing the automatic programmer, cuing t he user
through the step-by-step setup process. One of the recorder' s soft-touch electronicall y activated
pushbuttons can put up to nine index pulses on the tape for instant program-segment locations-
and those indexing pulses are indicated on the display. A separ ate multi-LED display indicates
tape remaining in the cassette. By fall, Sony and Zenith are expect ed to offer as many as five
different VCR's using the new Beta design-which, of course, is compatible with other Beta
recorders. It will record in Beta II or Beta III speeds and play back in those or Beta 1.
Giant-screen TV is moving ahead with two unique rear -pr ojection designs. The most unusual is a
new set by Zenith. When turned off, it looks like a furniture cabinet about the size of a lowboy
25-inch console. When the "on" button is pressed on the infra-red wireless remote control, the
top of the cabinet hinges back and a 45-inch lenticul ar screen rises slowly upwards. When you' re
finishing viewing, just click the remote off and the screen descends back into the console.
The unit uses three 5-inch projection tubes made by Zenith, with faceplates angled so that the
picture is self-converging. The tubes ' spot size is claimed to be the smallest in the industr y and
peak brightness is said to be 180 foot-lamberts.
Another advanced rear-screen projector design will be fielded this fall by Magnavox, Philco,
and Sylvania, all subsidiaries of North American Philips . The cabinet is far bigger than Zenith's
and the picture measures 50 inches. The entire system-electronics, tubes , and optics-has been
designed from the ground up for projection. The most striking aspect of this set is its special
fresnel screen . It incorporates 1000 lenticular lenses sur rounded by a black matri x, similar to
that used in picture tubes, to increase cont rast. The enhanced contrast result s in a picture with
qualit y close to that of a dir ect-view tube. The manufacturer claims that the system present s 410
lines of resolution from direct video input (330 from an off-air picture), with a 40 to I contrast
ratio in 50-foot-candl e ambient light , and a wide viewing angle.
Both the Zenith and the Philips projectors, priced at $3,500 and $3, 750 respectively, use f/1
lenses built by U.S. Precision Lens Co. A new extremel y compact lens system, designed for
rear -projecti on, currently in the works, is expected to give birth to the next generation of
small-cabinet sets next year. Thi s new system, combined with such approaches as Zenith's
pop-up, should lead to new popularity for projection sets.
Many-but not quite all--Qf the traditional functions of the Sears catalog may be taken over by
the videodisc. As an experiment, Sears is distributing the electronic version of its 236-page
summer catalog to 1000 owners of Pioneer LaserDi sc players. The optical disc is divided into 13
"merchandi se shops," directly addressable by frame number, and 13 "fashion shows and demon-
strat ions," which may be called up by dialing the proper chapt er numbe r. The latter consist of
demonst rations in motion and sound, the former of still frames illustrating and describing the
merchandi se. There are nearly 18,000 items on the single-sided disc, which would run only 28
minutes if played straight through. In addition to copies at the homes of player owners, Sears
will have the disc catalog available at some catalog order stores and counters. Intere stingl y,
alt hough Sear s uses the optical system for its catalog, it is selling only the CEO capacitance-type
disc player for consumer use.
DAVID LACHENBRUCH
CONTRIBUTING EDITOR
VIIhaf-s rJeVlls
KQED'S CHIEF ENGINEER FRED KROCK and music director Victor Ledin with Sony' s PCM-100
digital audio encoder.
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Specialists in demand
by employers in '80's
Graduate compu ter scient ist s will be re-
cruited by more firms than graduates in any
other specialty, accordi ng to a recent sur-
vey of 947 employers hiring technical grad-
uates in 1981. Mechanical and electrical
engineers are also in demand and will be
recruited by two-thirds of the compan ies
surveyed.
The demand for new specialties will be
increased by the new technologies now
developing. The survey source , Peterson ' s
Guides Annual Survey of Technical Career
Opportunities, lists 100 companies that are
seeking nuclear engineers, 27 that are hir-
ing meteorologists, 40 that are recrui ting
marine engineers, and 21 that need solar
engineers.
Digital radio broadcasts
In a U.S. radio " first" , San Francisco sta-
t ion KQED-FM has aired a series of con-
certs recorded live using digital audio. The
complete season of the San Francisco
opera, as well as concerts of other San
fOrancisco musical organizations, were in-
cluded in the stat ion's nationally broadcast
programs. Station KQED is using a Sony
PCM-100 digital processor for the record-
ing and broadcasts, which are beamed to
244 National Public Radio affiliates via the
National Public Radio satell ite.
The reaction of listeners and participat-
ing radio management s has been " ex-
tremely positive," says KQED. A typical
commen t is that t he digital recordings are
" identical" to a direct live audio pickup (un-
like analog record ing, which has inherent
tape hiss and a much smaller dynamic
range). The station 's chief engineer says,
" The PCM recordings sound exactly like
live br oadcas ts. In AlB compari sons, I
can' t tell the diff erence."
The digital system has advantages other
than fidelity. Tape and storage costs can be
cut since the digital recordings are stored
on videocassett es inst ead of reel-to-reel
analog tape. The tapes suffer no detectable
loss of quality with age and use, and they
can be copied an unlimited number of
times with perfect accuracy.
Electronics Hall-of-Fame
Center proposed
Two vice presidents of the National Elec-
tronic Service Dealers Association (NES-
DA), Gene Dillingham and Bill Lawler, are
leading a project to inaugurate a Hall-of-
Fame Center as a tribute t o those who have
made significant contributions in the field
of electronics. It would include for starters
such figures as Thomas A. Edison, inventor
of the electric light, motion pictures, and
the phonograph; Lee deForest, the father
of radio; Hugo Gernsback, publisher, in-
ventor, and electronics prognosticator, and
David Sarnoff, color-TV pioneer.
Dillingham and Lauder presented the
plan to NESDA's House of Representa-
tives, which approved the project January
31, 1981.
NESDA is invit ing EIA, NEDA, ITA, NAE-
DA, NABER, NAVA, NATESA, and all other
national associat ions in the electronics in-
dustry to join in making this Hall of Fame
possible by forming a Hall-of-Fame Foun-
dat ion to administer the operation of the
Hall-of-Fame Center .
Inquiries may be sent to NESDA, Atten-
tion: J. W. Williams , 2708 West Berry St .,
Fort Wor th, TX 76109.
New small-car wiring system
A novel prototype car "wiring" system
was displayed by National Semiconductor
at the recent Society of Automotive Engi-
neers conference and exhibition. It was
designed to solve the problem of space lim-
itation in today's small cars.
The steady stream of compact economy
cars has posed a multitude of problems for
engineers. In particular, the space available
for automobile electrical harnesses-c-bun-
dies of electrical wir ing throughout the
car-has been restricted severely. The
ever-increasing variety of electrical acces-
sories on the newer cars makes the prob-
lem even worse.
National Semiconductor's system con-
sists of transmitters, receivers, and a pow-
er conditioner. The transmitters are con-
nected to the regular dashboard switches
(ignition, lights , etc.) They send an encoded
signal when the switch is turned "on"
(closed) and another when it is opened. The
receivers decode the signals and turn on
the corresponding loads (headlights, wip-
ers, etc.) or turn them off , as instructed.
The system's power conditioner filters
transients from the vehicle's electrical sys-
tem, protecting transmitters and receivers
and preventing false signals.
With this new multiplex "wiring" system,
the wiring harness can be reduced to three
wires: a high current-load power wire, a
multiplex system power wire, and a ground
wire. The space saving is significant. In
addition, the new system permits adding
extra electrical accessories at will, simply
by connecting additional transmitters and
receivers to the three key wires.
Speech synthesizer for low-
volume users
The Votrax SC-01 speech-synthesizer IC
is now available in low-volume quantities
through the company's newly established
sales division , Vodex , states Vodex general
manager Russell Thielman. The SC-01 IC,
released in 1980, is a speech-synthesizer
IC that produces speech using a propri-
etary technique for combining electronic-
ally generated phonemes through a series
of elect ronic commands to make an unlim-
ited vocabulary.
The " t alking" IC can now be purchased
in quantities from five to 5,000, where, pre-
viously, it was available only for large-vol-
ume orders. In quantities of 1,000, the IC is
available at a per unit cost of $37.50, says
Thielman.
continued on page 12
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Reg. $155.00
SPECIAL
$139.00
includes free case
Single Trace 15MHz
Dual Trace 30MHz
MS-15
The Roadrunner
Model 6100
5 Range audible signal-
ing function
0.5" LCD display
6 Functions
29 Ranges
WESTON

Dual Trace 15 MHz
BATTERY OPERATED
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OSCILLOSCOPES
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V-152B 15 MHz Dual Trace
V-202 20 MHz Dual Trace
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V-302B 30MHz Dual Trace
V-352 35MHz Dual Trace
V-550B 50 MHz Dual Trace,
Dual Time Base
V-1050 100 MHz Dual Trace,
Dual Time Base
Call For
Special Intro
Price Offer
New Sweep/Function Generator
DY4U4Xw,z" MODEL 3020
L:::lA1.. .111 Four inst ruments in one
package-sweep generator . func-
tion generator . pulse generator .
tone-burst generator .
Covers O.02 Hz-2MHz
1000 : 1 tuning range
Low-distort ion high-accuracy
outputs
Three-step attenuater plus
vernier control
Internal linear and log sweeps
, Tone-burst output is front-panel or
externally programmable
We carry a full line of multi meters, oscilloscopes, frequency counters, audio and
RF generators, power supplies and accessories.
Just call our Toll-Free number and one of our experts will answer all your
questions about test equipment.
KEITHLEY
TRIPLETT
:KPRECISION
New Portable Digital
Capacitance Meter
THE TEST EQUIPMENT
SPECIALISTS
TOLL FREE HOT LINE
800-223-0474 t=:I
PRECISION
VIZ nan
8 Non-Un"' Systems .
54 WEST 45th STREET, NEWYORK, N.Y. 10036 1--------------------------1
INNEWYORK STATE 212-687-2224
ePHILIPS WESTON
@HITACHI
LEADER DDORIC I
AUGUST

HICKOK
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color Tv. It's complete with built-in digi-
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NRI Training
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More than 60 years and amillion
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V I I h a ~ s ,.eVlls
continued from page 6
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Lithium photo batteries
A new high-performance cylindrical pho-
tographic battery with a storage (shelf) life
of more than five years is now available.
Introduced by Duracell International Inc., it
is the first cylindrical lithium battery avail-
able for consumer use in this country.
DURACELL's PX28L LITHIUM BATTERY
The new 6-volt battery is made up of two
3-volt cells. It is directly interchangeable
with present alkaline and silver-oxide types
and fits a wide variety of 35-mm cameras.
Most photo batteries have a storage life
of only one to two years, and many serious
photographers change them oftener than
once a year, to be sure of dependable ser-
vice. The Duracell PX28L can be stored in a
camera for more than five years with little
or no loss of energy.
Telematic acquires RCA division
Telernatlc, a manufacturer of TV service
components and an early constructor of
test jigs and adapters, has acquired the
RCA Test Jig and Adapter Division.
The company will manufacture the RCA
test jig and adapters as an independent
line. It will continue to make its own test jig
and adapters. The combination will enable
Telematic to service practically every tele-
vision set in use today.
All products will be supplied from Tele-
matic's plant at 108-02 Otis Avenue, Coro-
na, NY 11368.
Hitachi wins lawsuit
Hitachi, Ltd. , Tokyo, Japan, has an-
nounced that the billion-dollar antitrust and
ant idumping lawsuits filed by Zenith Radio
Corp. and National Union Electric Corp .,
against 21 Japanese and U.S. companies,
including Hitachi and two of its subsidiar-
ies, have been dismissed by the U.S. Dis-
trict Court in Philadelphia. The complaints,
filed in 1970 and 1974, alleged that the
defendants and almost 100 alleged co-con-
spirators had conspired to take over the
U.S. market for television receivers and
other consumer electronic products by
concerted dumping and price discrimina-
tion, and by pursuing unlawful acquisitions
in the United States.
The decision by Judge Edward R. Beck-
er, coming after more than ten years of liti-
gation, granted Hitachi 's motion for sum-
mary judgment as to all of plaintiffs' claims
under the Sherman Act, Robinson-Patman
Act , Clayton Act, and the 1916 Antidump-
ing Act. Last year the Court granted Hita-
chi 's motion for summary judgment as to
all but minor aspects of plaintiffs' other
claims under the 1916 Act. That ruling has
been appealed and is pending before the
U.S. Court of Appeals in Philadelphia.
Local TV stations
may triple in three years
If positive action is taken on rule-making
procedures now before the FCC; the num-
ber of channels available to the TV viewer
in most areas will increase within three
years to at least three times the number
now available.
That statement was made by Lo-Power
Digest, a new publication aimed at entre-
preneurs who may be interested in the pro-
posed new field for investment. It is based
on the FCC's decision to take appl icat ions
for new low-power stations under the same
rules as regular "translator" stations, that
simply repeat the programs of present TV
stations in areas where the coverage is not
good.
The result has been a flood of applica-
tions-supposedly exceeding 1,000 per
month-for the new stations. It is hoped
that new highly stable low-power solid-
state transmitters may allow the FCC to
relax some of the rules now applicable to
high-power stations to allow the low-power
stations to operate at a lower cost than is
now possible. That, plus low-cost cameras
and video-tape systems, may make low-
power local TV stations feasib le in smaller
cities that are not now considered large
enough to support a local station.
" Low-power television broadcasting, the
first new broadcast service considered by
the FCC in 20 years, offers the same possi-
bilities as the advent of commercial televi-
sion broadcasting in the 1940's," says
Charles D. Ferris , Chairman of the FCC. " It
poses the exciting chall enge to commercial
and noncommercial entrepreneurs of cre-
ating programming to make the new ser-
vice attractive to Americans. "
The proposed new service would operate
on UHF channels, with a power maximum
of 1,000 watts-enough to cover almost
any average-sized city. Stations would be
licensed to drop in on nearly any channel
where they could prove that no interference
would be caused to exist ing stations.
FIRST CO
2
MILITARY LASER
HUGHES AIRCRAFT ENGINEER William Tomita
adjusts the transmitter on an advanced proto-
type model of the first carbon-dioxide laser
developed in the United States for tactical mili-
tary applications. The transmitter and its elec-
tronics will 'be housed in the white casing at
left. The new laser will have several key advan-
tages over the solid-state lasers now used in
military rangefinding. A carbon-dioxide laser
will penetrate battlefield smoke and dust better
than a solid-state device. It also operates in the
same waveband as the tank's thermal-imaging
system. That means that the laser will reach
any target that the gunner can see through his
thermal night sight. The new laser is harmless
to the human eye and can be used safely in
training exercises.
Direct satellite broadcast
endorsed by FCC
At a recent meeting, the FCC endorsed
the general idea of direct television broad-
casting from satellites to private homes. It
also took under consideration a COMSAT
proposal to provide that service.
Few of the details of the proposed ser-
vice were worked out, but the Commission
expects t o be able to give final approval to
the new service sometime in 1981. The FCC
has already warned microwave communi-
cations systems that they may have to
cease operating in the 12-GHz band, be-
cause of possible interference with the sat -
ellite-home TV signal s.
Television broadcasters are not happy
with the new proposal; the National Associ-
ation of Broadcasters suggests that the
service should be studied further, and then
approved by Congress before implementa-
tion . "Any interim approval by the FCC is
shortsighted," stated NAB president Vin-
cent T. Wasilewski. R-E
12
1-800-556-7586
EAST COAST
OMEGA Sales Co.
12 Meeti ng St.
Cumberland, RI 02864
1-401-722-1027
$2799
$3195
$2595
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$ 529
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$1225
$1449
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$ 679
$ 289
$ 85
$3245
$ 839
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$ 99.95
$ 165
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$ 619
$ 139
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$ 449
WEST COAST
OMEGA Sales Co.
3533 Old Conejo Rd. #102
Newbury Park, CA 91320
1-805&0.499-3678
CA. TOLL FREE 1-800-322-1873
1-800-235-3581
INTERTEC SUPERBRAIN 64K RAM
QD SUPERBRAIN
NEC 5510 SPINWRITER
NEC 5530 SPINWRITER
OKIDATA MICROLlNE-80
"OKIOATA MICBOtINE-82
OK\E)ATA MICROLlNE-83
APPLE II PLlJS 48K
ARPLE DISK w/3.3 DOS Controller
P.. PPLE DISK w/o Controller
BASE II PRINTER
HAZELTI NE 1420
NORTHSTAR HORIZON II 32K QD
ANADEX DP-9500
T-ELEVIDEO 912C
TELEVIOEO 920C
TELEVIDEO 950
CBM 8032 COMPUTER
CBM 8050 DISK DRIVE
CBM 4032 COMPUTER
CBM 4040 DISK DRIVE
CBM 4022
CBM VIC-20
CBM C2N
RADIO"SHABK II 64K
RADIO SHACK III 16K
CEEDEX/ AMDEK 100
LEEDEX/AMDEK 100G
LEEDEX/AMDEK COLOR-1 13" Color Monitor
MICROTEK 16K RAMBOARD for ATARI
MICROTEK 32K
ATARI 400 16K
ATARI 825 PRINTER
ATARI850lNToERFACE
or both together
ATARI810 DISK DRIVE
(Call for price list of ATARI software)
WE ACCEPT C.O.Do'S
NO SURCHARGE FOR
CREDIT CARD ORDERS
ALL EQUIPMENT FACTOR"
FRESH W/MFT.WRNTY.
STOCK SHIPMENTS
SAME DAY OR NEXT
ATARI 800 32K $779
NEC 12-
MONITOR
$229
PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE.
::E EAST COAST / WEST COAST e ~
OMEGA SA"LES COMPANY
CIRCLE 40 ON FREE INFORMATION CARD
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TWELVE STRONG
HEATH/ZENITHYOUR
Pick a strong partner
Acomputer purchase is the beginning of a long term
partnership between you and the people you buy from.
Your ongoing need for software and accessories re-
quires a partner who will stand by you with a growing
line of products. And nowhere will you find a more com-
plete line of hardware, software and accessories than
at your Heathkit Electronic Center. Here are twelve
strong reasons to make Heath/Zenith your partner.
1. The AII-In-One Computer
The heart of the Heath/Zenith line is the stand-alone
89 Computer. It's a complete system with built-in 5Y4-inch
floppy disk drive, professional keyboard and keypad,
smart video terminal, two Z80 microprocessors, and
two RS-232C serial I/O ports . It comes with 16K RAM,
expandable to 64K.
6. Utility Software
Expand the performance range of your computer with
a broad selection of util ity tools, including the best of
Digital Research and the complete line of innovative
Softstuff products.
7. Disk Systems
The 8-inch Heath /Zenith 47
Dual Disk System adds over 2
megabytes of storage to your
89 Computer. Diskettes are
standard IBM 3740 format , double-sided,
double-density.
The 5Y4-inch 87 Dual Disk System adds
200K bytes of storage to your 89. Both
disk systems feature read/write protec-
tion and easy plug-in adaptability.
All Heathl Zeni th
Computer Products
are available completely
assembled and tested for
commercial use. Orin easy-
to-build, money-sa ving kits.
8. Self-Study Courses
Learn at your own pace
with Programming
Courses that teach you
to write and run your own
programs in Assembly,
BASIC, Pascal or
COBOL.
A course on Computer Concepts
for Small Business gives you
the understanding to eval-
uate the ways a computer
can benefit your business.
Personal Computing is a
complete introduction to
the fundamentals for the
novice. Every Heathkit!
Zeni th course is pro-
fessionally designed
for easy, step-by-
step learning.
4. Programming Languages
Foryour own custom programs,
Microsoft languages are
available in BASIC (compiler
and interpreter) , FORTRAN
and COBOL.
2. Peripherals
These include the popular Heath /Zenith
19 Smart Video Terminal, loaded with
professional features. And the 14 Line
Printer, priced as low as $495. Other
printer brands are on display,
including high-
speed, typewriter-
quality printers.
5. Operating Systems
Three versatile systems give you the capability to per-
form your specific tasks.
CP/M by Digital Research makes your system com-
patible with thousands of popular CP/M programs.
UCSD P-System with Pascal is a complete program
development and execution environment.
HDOS, Heath Disk Operating System gives you a
sophisticated, flexible environment for program
construction, storage and editing.
3. Software
Word processing, includes reliable, easy-to-use
Zenith Electronic Typing and powerful , full-featured
WORDSTAR.
Small Business Programs, feature General Ledger and
Inventory Control.
HUG, Heath Users ' Group, offers members a library of
over 500 low-cost programs for home, work or play.
14
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REASONS TO MAKE
COMPUTERPARTNER
Your strong partner
CLEVELAND,OH
28100 ChagrinBlvd.
216-292-7553
COLUMBUS,OH
2500MorseRd .
614-475-7200
TOLEDO,OH
48S. ByrneRd .
419-537-1887
WOODLAWN,OH
10133 SpringfieldPike
51 3-771 -8850
OKLAHOMA CITY, OK
2727 Northwest
Expressway
405-848-7593
FRAZER,PA
630 Lancaster Pike
(Rt.30)
215-647-5555
PHILAOELPHIA, PA
6318 Roosevelt Blvd.
215-288-0180
PITTSBURGH, PA
3482Wm. Penn Hwy.
412-824-3564
WARWICK, RI
558Greenwich Ave.
401-738-5150
DALLAS, TX
2715RossAve.
214-826-4053
HOUSTON,TX
1704W. Loop N.
713-869-5263
SAN ANTONIO, TX
71 11 Blanco Road
51 2-341 -8876
MIDVALE, UT
58East 7200South
801-566-4626
ALEXANORIA, VA
6201Richmond Hwy.
703-765-551 5
VIRGINIABEACH, VA
1055 IndependenceBlvd.
804-460-0997
SEATTLE, WA
5058thAve . N.
206-682-2172
TUKWILA,WA
1543953rdAve . S.
206-246-5358
MILWAUKEE, WI
5215 W. Fond du Lac
414-873-8250
Units of Veritechnology
Electronics Corporat ion in
the U.S.
Prices and specifications subject to change without notice.
Visit Your Heathkit Electronic Center*
where Heath/Zenith Products are displayed, sold and serviced.
PHOENIX, AZ MISSION, KS
2727Wln dianSchoolRd. 5960 LamarAve .
602-279-6247 913-362-4486
ANAHEIM, CA LOUISVILLE, KY
330E. Ball Rd. 12401 ShelbyvilleRd.
714-776-9420 502-245-7811
CAMPBELL, CA KENNER, LA
2350 S. BascomAve. 1900 Veterans
408-377-8920 Memorial Hwy.
ELCERRITO, CA 504-467-6321
6000PotreroAve. BALTIMORE, MO
415-236-8870 171 3E. Joppa Rd .
LAMESA CA 301-661-4446
8363Cenier Dr. ROCKVI LLE, MO
714-461-011 0 5542Nicholson Lane
LOS ANGELES CA 301-881-5420
2309S. SI. PEABODY, MA
213-749-0261 242Andover SI.
617-531-9330
POMONA, CA WELLESLEY MA
1555 N. Orange GroveAve. 165 WorcesterAve.
714-623-3543 617-237-1510
REDWOOD CITY, CA DETROIT MI
2001Middlefield Rd. 18645 W.'EightMileRd .
415-365-8155 313-535-6480
SACRAMENTO, CA E DETROIT MI
1860FultonAve . 181 49E. Eight Mile Rd .
916-486-1575 313-772-0416
WOOOLAND HILLS, CA HOPKINS MN
22504VenturaBlvd. 101 Shady Oak Rd.
213-883-0531 612-938-6371
OENVER, CO ST PAUL MN
5940W. 38thAve. 1645 Whii eBear Ave.
303-422-3408 612-778-1211
AVON, CT BRIDGETON MO
395W. Main SI. (RI. 44) 3794 Rd .
203-678-0323 314-291-1850
HIALEAH, FL OMAHA NE

305-823-2280 402-391 -2071
PLANTATION, FL ASBURY PARK, NJ
71 73 W Broward Blvd. 1013StateHwy. 35
305-791-7300 201-775-1231
TAMPA, FL FAIR LAWN NJ
4019 W. HillsboroughAve . 35-07Broadway (RI. 4)
813-886-2541 201-791-6935
ATLANTA, GA AMHERST NY
5285 Roswell Rd . 3476 Sheridan Dr.
404-252-4341 716-B35-3090
CHICAGO,IL JERICHO, L.1. NY
3462-66W. DevonAve. 15Jericho Turnpike
312-583-3920 516-334-8181
DOWNERS GROVE, IL ROCHESTER, NY
224OgdenAve . 937Jefferson Rd.
312-852-1304 716-424-2560
INDIANAPOLIS, IN N. WHITE PLAINS, NY
2112 E. 62nd SI. 7 Reservoir Rd .
317-257-4321 914-761 -7690
HEATH/ZENITH
All at your
Heathkit Electronic
Center
Pick the store nearest you
from the list at right. And
stop in today for a demon-
stration of the Heath/Zenith
89 Computer System. If you
can't get to a store, send
$1.00for the latest Heathkitv
Catalog and the new Zenith
Data Systems Catalog of
assemb led commercial
computers. Write to
Heath Co., Dept. 020-804,
Benton Harbor, MI 49022.
12. Value
Your money buys you more because
Heath /Zenith prices are among the industry's most
competitive. Make your own comparison and find out
how much you can save.
Complete, integrated computer hardware and soft-
ware, designed to serve you and to grow with you
- that's what to look for in a strong partner. And
with Heath /Zenith you get it all unde r
one roof.
11. Service
No one stands by you like Heath/Zenith.
We help you get your system up and
running smooth ly. Service is avail -
able from trained technicians,
over the phone or at one of 56
Heathkit Electronic Centers .
9. Expansion Options
Communicate wit h the outside world through a Three-
port EtA RS-232C Seriattnterface.
Expand RAM to 64K with easy-to- install expansion
chips.
10. Accessories
Your Heathkit Electron ic Center has the
latest in modems, black-and-white and
color video monitors, computer furniture
and a full line of supplies, accessories, books
and parts .
15
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Becoming An Author
Wherever I go , the most often asked question is: " How do I go
about writing an article for Radio-Electronics?" I do not dismiss
that question lightly. Our readers represent a vast untapped reser-
voir of knowledge. Each and every one of you has developed a
special expertise in at least one particular area. Many of you have
unique ideas and knowledge that is not widely known. The drive to
acquire knowledge and share knowledge and ideas with others is
immense. In fact , t hat is the main funct ion of Radio-Electronics. It
is a vehicle for t he exchange of knowledge and ideas. For those
reasons we encourage our readers to write articles.
What do you get out of writing an art icle? Aside from the ext ra
income and recognition of having your name in print , there's the
satisfaction of sharing your knowledge with others. In effect, you
have advanced the knowledge of the members of this industry and
have helped people just like yourself. Indeed , it is a rewarding and
satisfying achievement.
Submitting an art icle is not difficult. It is simply a matter of
sending it t o my attention. The best fi rst step, however, is to send
me an outline of the article to see if we' re interested in the subject.
If we are, we' ll tell you to go ahead and perhaps even make a few
suggest ions regarding your outline.
There are far too many steps involved in writing an art icle for us
to cover here . However, we do have an Author's Guide that will
answer many of your questions. If we've managed to stir your
curiosity, then send a self-addressed stamped envelope to Author's
Gu ide, Radio-Electronics, 200 Park Avenue South, New York, NY
10003 , and we'll send you one.
Now what's your excuse for not writi ng an arti cle?
ART KLEIMAN
Managing Editor
Hugo Gernsback (1884-1967) founder
M. Harvey Gernsback, edi tor-i n-chief
Larry Steckler, CET, publisher
Arthur Kleiman, managing editor
Josef Bernard, K2HUF. technical editor
Carl Laron, WB2SLR, assistant edi tor
Jack Darr, CET, service editor
Leonard Feldman
contr ibuting high-fidel ity edi tor
Karl Savon, semiconductor editor
Herb Friedman, communicati ons editor
Gary H. Arlen, contributing editor
David Lachenbruch, contributing editor
Earl "Doc" Savage, K4SDS, hobby editor
Ruby Yee, production manager
Robert A. W. Lowndes, production
associate
Joan Burwick, production assistant
Gabriele Margules, circulation director
Arline R. Fishman,
advertising coo rdinator
Cover photo by Robert Lewi s
Radio-Electronics is indexed in Applied
Science &Technology Index and Readers
Guide to Periodical Literature.
Gernsback Publ icat ions. Inc.
200 Park Ave. S.. New York . NY 10003
President : M. Harvey Gernsback
Vice President : Larry Steckler
Secretary/Treasurer : Carol A. Gernsbac k
ADVERTISING SALES 212-777-6400
Larry Steckler
Pub lisher
EAST
Stanley Levit an
Radio- Electronics
200 Park Ave. Sout h
New York. NY 10003
212-777-6400
MIDWEST/Texas/ Arkansas/Okla.
Ralph Bergen
The Ralph Bergen Co.
540 Frontage Road-Suit e 361-A
Northfield. Ill ino is 60093
312-446-1444
PACIFIC COAST
Mountain States
Marvi n Green
Radio- Electronics
413 So. La Brea Ave.
Los Ange les. Ca 90036
213- 938-0166-7
SOUTHEAST
Paul McGinn is
Paul McGinnis Company
60 East 42nd St reet
New York. N.Y. 10017
212-490-1021
NOWSONYTEACHESYOU
THETHEORYBEHIND
VIDEO COLOR SYSTEMSAT
THETOUCH OFABUTTON.
It's a whole new way of getting an education in color video technology-Sony-style.
The classroom is home or shop. The seat-your most comfortable. The hours-your own. The
method-five videocassettes and five accompanying booklets that make up
a complete, self-paced learning program. With Sony teaching.
Called "Color Systems: ' this second course in Sony's Video Funda-
mental Series is designed for those who require a thorough back-
ground in all aspects of color theory as it applies to the VIdeo
mdustry today. .
You'll see clear demonstrations that unravel the myster-
ies of color circuitr y-from cameras to CRT's. Youwill learn
about the equipment and signals used for testing, plus useful
techniques for troubleshootmg color video systems. Each cassette
comes with its own study booklet, whose self-review questions show
you when you're on top of the material and ready to move on.
You can order a preview tape, individual tapes on a
specific subject or the entire Color Systems course in Betamax
or U-matic format.
Course Contents: 1. Properties of Color. 2. Color Cam-
era Systems . 3. Video Display Systems. 4. Encoding NTSC Color. .
5. Decoding NTSC Color.
Whether you own, sell or service video equipment, or have
an overall electronics background, "Color Systems' will make you
thoroughly at home in the world of color video technology.
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Exp. Date VISA/MasterCard Number
City ---'-'State, _
Zip Code. .Phone # _
~
We ho_no _r_V_I_SA _a_nd _M_a_st_er_c_a-Ord_v_i_a_ph_o_n_e_o_ r m_ai_l.__. , ..
Name
Address, _
Signature
Mai l to: Sony Video Products Company.Tape Production Services.
700 W. Artesia Blvd.. Compton. Californ ia ~ 0 2 2 0 .
o Please send additional information.
NOTE: Tapes returnable if defect ive when received. Please allow two
weeks for deliver y.
SONY:
Video Communications
Sony. Betamax and U-matic are registered trademarks of the Sony Corp.
CIRCLE 25 ON FREE INFORMATION CARD
SONYCOLOR SYSTEMS COURSE
I'm interested in learning color video technology. Please send me:
COLOR SYSTEMS SERIES-COMPLETE
(5 cassettes/ booklets. customized album an d binder supplied)
Betamax 0 I hr. 0 2 hr $295.00
Regular Price 5330.00
3;"" U-matic D $355.00
Regula r Price 5405.00
1_ . 2_ . 3 _ ' ~ 4 _ ~ 5_
PREVI EW TAPE
Betamax 0 I hr. 02 hr '. ' $12.50
U-matic 0 $28.00
Add appropriate sales tax and $1.75 per cassette ($8.75 for complete
course ) for handling and shi pping. (UPS in continental U.S. If outside.
add $30.00 for Expor t Cha rges. plus Collect Freight Char ges ; special
han dling is extra.) For phone orde rs. call (213) 537-4300. xJ3l, or visit
your local SONY Video Produ cts Dealer.
INDIVIDUAL LESSONS
(Pri ce per cassette/booklet)
Betamax 0 I hr. 0 2 hr $66.00
W' U-matic D $81.00
Circle lesson # and indi cate quantity desired in space provided .
(/)
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"Ifyouregoing tolearn
electronics, you might
aswell learnitright!"
"Don't settle for less.
Especially when it comes
to career training. ..because .
everything else inyour life
may depend on it. That's
why you ought to pick CIE!"
Accred ited Membe r Nationa l Home Study Council
Age .Phone (area code) _
Check box for G.!. Bill information: D Veteran D Active Duty
MAlLTODM:
o YES... I want the best of everything! Send me my FREE cmschooi
catalog - including details about the Associate Degree program- plus my FREE
package of home study information. RE-18
Associate Degree .
Now, CIE offers an Associate in
Applied Science Degree in Electronics
Engineering Technology. In fact,
all or most of every CIE Career
Course is directly creditable
towards the Associate Degree.
Send lor more details
anda FREE school
eatalog.
Mail the card today. If'tt's gone,
cut out and mail the coupon. You'll
get a FREE school catalog plus com-
plete information on independent
home study. For your convenience,
we'll try to have a CIE representa-
tive contact you to answer any ques-
tions you may have.
Mail the card or the coupon or
write CIE (mentioning name and
date ofthis magazine) at: 1776East
17th Street, Cleveland, Ohio 44114.
Pickthepace that's right
lor you
CIE understands people need
to learn at their own pace. There's no
pressure to keep up . . . no slow
learners hold you back Ifyou're a
beginner, you start with the basics.
Ifyou alreadyknow some elec-
tronics, you move ahead to your
own level.
Enjoythe promptness 01
CIE's "same day" grading
cycle.
When we receive your lesson
before noon Monday through Satur-
day, we grade it and mail it back-
the same day. You find out quickly
howwell you're doing!
CIEeanprepare you lor
your FCCLicense.
For some electronicsjobs, you
must have your FCC License. For
others, employers often consider it a
mark in your favor. Either way, it's
government-certified proofofyour
specific knowledge and skills!
More than half ofCIE' s courses
prepare you to pass the government-
administered exam. In continuing
surveys, nearly 4 out of5 CIE gradu-
ates who take the examget their
Licenses!
r---------.-..----
I

C I E
Cleveland Institute of Electronics, Inc.
1776 East 17th Stre e t . C leveland. Ohio 44114
I

I
PrintName _

Address Apt. _
City _
State ----LZip _

Meet the Electronics

Specialists.
When you pick an electronics
school, you're getting ready to invest
some time and money. And your
whole future depends on the educa-
tion you ~ e t in return.
That s why it makes so much
sense to go with number one .. . with
the specialists ... with CIE!
There's no suchthing as
bargain eduea60n.
Ifyou talked with some ofour
graduates, chances are you'd find a
lot ofthemshopped around for their
training. Not for the lowest priced
but for the best. They pretty much
knewwhat was available when they
picked CIE as number one.
We don't promise you the moon.
We do promise you a proven way to
buildvaluable career skills. The CIE
faculty and staffare dedicated to
that. When you graduate, your di-
ploma shows employers you know
what you're about. Today, it's pretty
hard to put a price on that.
Because we're special-
ists, we have to stay
ahead.
At CIE, we've got a position of
leadership to maintain. Here are
some ofthe ways we hang onto it .. .
Ourstep-by-steplearning
includes "hands-on"
training.
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GOING ALOFT
AROUND THE
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CIRCUIT
At the latest gathering of the Satellite Private Terminal Seminar in Washington in early spring,
the cost of home satellite receivers dropped to an all-time low. Complete packages of equipment
were available for as little as $1,800. In truth, a realistic package of antenna, tuner, LNA, and
associated hardware still costs around $3,000 for a parabolic dish; and that means a retail price of
up to $6,500 for the same equipment. But if you'll be satisfied with a spherical antenna and lesser
quality hardware, you can get into satellite TV for under $2,000.
Close to 2000 people showed up for the SPTS conference and there were more than 50
exhibits . Even Ralph Nader stopped by to offer a word of encouragement. A number of new
vendors showed up with equipment, such as SatFinder Systems, which unveiled several equip-
ment packages. Its SS-l deluxe rotatable antenna setup includes a 10-foot fiberglass dish, a polar
mount, LNA and polarity motor, additional equipment, and directions on how to install a
foundation , forms, and assembly. For $1700 less, the company offers a hand-rotatable unit with
a scaled down equipment package.
National Microtech came with a glossy package of literature and a full-line of equipment,
starting with its Apollo XK package for $3,980 (including 120 LNA, 10-foot dish and KLM
receiver). Remote tunable receivers were available from many new suppliers .
The success of the conference bodes well for the next SPTS conference slated for August
14-16 in Omaha. Details are available from Satellite TV Technology Inc., PO Box G, Arcadia,
OK 73007.
Among the fascinating visual glimpses during the conference were the array of dishes spread
out all around the grounds and parking lots of the hotel where the meeting was held. The
exhibits even lapped over to nearby streets, where one vendor parked his car, with a trai ler and
small-dish antenna in tow.
The increasing interest in satellite communications by major TV broadcasters was evident at the
National Association of Broadcasters convention. In much the same way thai the cable TV
industry plowed into satellite usage five years ago, broadcast operators now seem ready to get
into t he act effectively. AT&T, which now carries much of the network TV broadcasting via
microwave circuits nationwide, was on hand to show off several of its new services for satellite
transmission-including an impressive all-digital process that it can now use for FM radio
satellite trans mission.
As at other conferences, the parking lot was packed with dishes, including a novel "SimuISat"
dish t hat was unveiled by Satellite Communications Network, a small New Jersey firm. The
antenna, which looks like a cut-off version of a 1O-meter dish, can pick up signals simultaneously
from as many as four different satellites.
The ABC, CBS, and NBC TV networks are going to test the idea of sending all of their
programming via satellite. The test, due to begin in October, will last about three years and
probably use the latest AT&T Comstar satellite (8r west longitude) . One network official said
the networks expect to know within a year if the satellite feed is preferable to the expensive and
extens ive set -up of terrestrial microwave facilities that the networks now use.
AT &T may have another interesting new customer-the world's largest printer, R. R. Don-
nelley and Sons. The company wants to transmit high-speed data-I .5 million bits per second-
to its regional printing plants. It would be the first commercial use of AT&T's satellites for such
massive data transmission.
RCA Americom has developed a new satellite TV distribution technique that makes it possible to
put earth stations in areas subject to terrestrial microwave interference. Optimized Video
Transmission (OVT) is a method that makes it possible for a TVRO to be co-located with TV
studios in electronically congested downtown areas. The new technology can produce a substan-
tial improvement in the picture by eliminating the low-level impulse noise that is often prevalent
in small earth stations; in essence, the system shaves off part of the bandwidth to eliminate
interference from other RF transmissions .
Wold Communications, which is offering expanded video programming for broadcast and
private TV networks, will begin using two transponders on the new AT&T satellite, probably
beginning around next March 1.
Satellite Music Network is now beaming two audio channels-Modern Country music and
Pop Adult music-via Westar to radio stations around the country.
GARY ARLEN
CONTRIBUTING EDITOR
BECKMAN
Convenient storage and multiple viewing angles
are featured in the new line of Beckman bench!
portable DMMs.
Introducing theTECHTM360
DMM. Mever has it been
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portable DMM puts unmatched for just $289 (U.S. only), including
capability and convenience at your batteries. The companionTECH
fingertips . quickly, with audible and visible 350 (without RMS and temperature
You can select from 8 functions indications. Measure up to 10 amps measuring capability) is priced
and 31ranges with one turn of the without adding special adaptors. at $229.
single selector switch. All with 0.1%basic Vdc accuracy. For information on the com-
an or off the bench, you can 12,000 hour battery life plete line of Beckman DMMs and
accurately measure all complex Designed for ultimate ease of accessories, call your local distrib-
waveforms withTrue RMS ACfunc- operation, the TECH 360 delivers utor today. For the one nearest you
tions. Extend resistance measure- 12,000 hours continuous service(up call: (714) 993-8803 or write
ment to 1/100 ohm resolution. Read to 4 years of normal use) from stan- Beckman Instr uments, Inc., Electro-
temperatures from - 20 C to dard heavy-duty batteries. You'll Products Group, 210 South Ranger
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lef:f:ers
NATIONAL IC's
I have good news for readers who have
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MM 5369ESTIN is available for $2.85
postpaid, and the 74C90N is availab le for
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f rom Ci rcu it Spec ialists Co., POBox 3047,
Scottsdale, AZ 85257-and for these parts
only there is no minimum order.
They also have other hard-to-find parts.
GARY McCLELLAN
LED VU METER
We not iced Brad Albing' s art icle, " Led
VU Meter for Your Hi-Fi ," in t he May
Radio-Elect ronics. It was good, but he is
qu ite out of date in saying that " at the
present t ime, onl y Exar is manufacturing
an IC suitab le fo r use in a VU meter ." Na-
tional Semiconductor has been making
t he LM3916 for over a year now, and it
covers t he VU range f rom +3VU to
-20VU. This IC includes complete out-
put -current dri vers for LED's so that no
externa l tr ansistors or current-limiting re-
sistors are needed . Also, when used in
conjunction with an LM3915, it can cover
a wider range to - 40VU per the applica-
tion notes in the LM3916 data sheet.
ROBERT A. PEASE,
Staff Scientist,
National Semiconductor Corporation
Santa Clara, CA
You're absolutely correct. However, Mr.
Albing is not at fault. When he wrote the
article, well over a year ago, the statement
was correct. Our editorial staff must ac-
cept the responsibility for not catching
this when we published the artie/e.-Editor
BALLY ARCADE INFORMATION
I noticed Mr. Cornett 's letter on page 23
of the May issue of Radio-Electronics.
One wou ld infer from it that there was no
other Bally-oriented information source
available. In actuality, I have been pub-
lishing t he Arcadian Newsletter since
November, 1978.
I real ize that this is a pure oversight on
Mr. Cornett's part, since he has been a
subscriber for quite a while, and it was his
advertisement in issue number 11 that
started his current operation.
I would appreciate a mention of the
Arcadian in the next available issue of
Radio-Electronics, to inform your readers
of an alternative or concurrent informa-
tion/software/hardware source. Our sub-
script ion rate is $12.50 per year.
ROBERT FABRIS,
Arcadian, 3626 Morrie Dri ve,
San Jose, CA 95127
PIRATE BROADCAST STATIONS
I am shocked and disgusted wi th the
art icle, " Pirate Broadcast Stat ions"
(Radio-Electronics, May 1981), wherein
the author, Robert Grove, not only reports
their existence but makes the art icle a
plug for them. As I see it, a reputable
magazine is now advocating breaking the
law.
The article clearly shows the current
left ist rhetoric against the " establish-
ment," " t humbing their noses at the
FCC," etc . I do not go along with the
Signature
Send to : R03Oi:IO..lGc , PO Box 372,Tujunga, Califomia 91042
City State/ Providence /Count ry Postal Code
United Ca nada Foreign
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AUDIO POWER METER
In referenc e to the art icle, "Audio Power
Met er" in the February 1980 Radio-Elec-
tronics: there's an error on page 46 in the
component-pl acement guide: D7 (diode
D7) is placed backwards. The schematic
on pages 44/45 is correct.
After many f rust rati ng hours, where my
righ t channel wasn' t operating, whi le the
left channel wo rked perfec t ly, I found that
the above was the sol ut ion. Other than
that. I'm very happy wit h the meter.
DAVE KRABBENHOn
CABLE TV
Recentl y, I read your editorial , " Cable
Television-The Clou d Behind t he Si lver
Lining" (Radi o-Electroni cs, February
1981), and I am very dist urbed by what I
have been reading in your magazine, and
elsewhere, wit h respect to the f ut ure of
broadcast tel evision and cablevision.
I. for one, do not wish to see cable com-
pete with t he networ ks or local stations if
com mer cials are going to dominate the
cabl e-TV networks the way -they have on
broadcast tel evision.
I do not mi nd paying for cable-TV if I
can watc h a prog ram without t he loud
and annoyi ng commercials, watch pro-
grams that are slanted towards the con-
sumer (auto repai r, food -purchasing, etc.),
watch recent quality movies (regard less
of mov ie ratin gs), and enjoy a multi t ude
of cable 's exclusive services, such as the
interactive systems. In the near future,
those interactive systems will allow a home
to be wired via t he cable company for in-
trusion al arms, al low the elder ly to call for
emergency aid, and provide ot her services
requi ring two-way commun ications.
The interactive systems might be ex-
pand ed to allow for a variety of discus-
sion shows presentin g informati on and
answering quest ions via cable, or a toll -
free telephone number, on a number of
subjects such as satell ite TV, amateur
radio, mi nor television repairs, bicycle re-
pairs, automobile maintenance and re-
pair , cook ing, cabinet -mak ing-the list
could go on and on.
There are j ust too many " t ime-f illers"
on broadcast television, and not enough
quality pro gramming like Perry Mason or
Bonanza, where the family can learn
tidbit s about law or obta in new view-
points on the fair way to treat peop le.
"How to " programs cou ld help t he con-
sumer-even t he most inept homeowner-
to fight back at infl ati on. This, then, is the
big challenge I see for cable-TV: to put
"l earning" back into television and take
out the wast eful time-f ill ers. To add mor e
commer cials, or more shows like Dukes
of Hazzard, is not a " service" to t he
public but a disservice. To pay for that kind
of nonsense is j ust like rubbi ng salt into an
open wound, and is an injustice to us all .
In summary, I don 't mind paying for a
serv ice (something t hat offers potential
benefit to us all), but I do mi nd, and object
to, paying for more commercials and
lower-g rade programmi ng that only allows
us to waste away in our easy chairs in
f ront of the idiot box.
KENNETH PROCTOR, E.E..
Br icktown , NJ
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propositi on t hat the establi shment is
totally wrong in all t hat it does; that the
FCC is gui lty of " censorship," or that the
out laws provide " a breat h of air" in a sea
of drivel.
The next time you are over the ocean in
a jet, let us hope t hat thi s "drivel " (your
pi lot call i ng traff ic control, for example) is
not drown ed out by some ill egal nit wit
who is sel fi shl y using somet hing t hat is
not his to use.
Let us give credit where cred it is due. I
have been in radi o commu ni cations for
nearly half a century; I have always found
the FCC to be honest, fair, and conscien-
tious. I have worked in practi call y all
types of radio, and I have always felt that
99% of my fellow workers in the indust ry
have bent over backward to obey t he
rules ; that without such voluntary co-
ope ration, of course, the FCC would be
powerl ess, and the airwaves would be a
nightmarish mess. (Take a look at the
citizens-band mess.) I also feel t hat the
legal amateurs have earned their right to
a port ion of t he spectrum, and resent
being crowded out by the outlaws .
Finally, radio is international. Granted ,
the agreements are not perf ect; but they
are a reminder that the nati ons can and
do get together in some things of mutu al
benefit (such as the post al service, World
Health Organi zation, etc.). How an Ameri-
can magazine could run an article that
condones these frequency t hieves is be-
yond my comprehension.
BEN LANE,
Tolovana Park, OR
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THE TOUCH TEST 20, RECENTLY INTRODUCED BY
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When the Touch Test 20 is t urne d on, it
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sured over six ranges. An accuracy of 0.2%
is claimed by the man ufacturer. The input
impedance is 10 megohms and t he AjD con-
verter uses an integrating tech nique that offers
high noise-rejection and good stabi lity, with a
minimum of critical components. AC-vo ltage
from 10 microvolts to 750 volts (RMS) is mea-
sured over six ranges. Accuracy is 0.5%
using an average-responding converter. The
input impedance is agai n 10 megohms. AC-
current from 10 microvolts to 10 amps is mea-
sured over four ranges . DC-current from 0.01
micr oamp to 10 amps is meas ured over seven
ranges.
Resis tance is measured over seven ranges.
Acc uracy of the readings is said to be 0.25%.
In all but the highest range (20 megohms) the
test voltage is less than 0.2 volt. That allows
in-circuit tests to be made without "turni ng
on" semiconductor devices. The Touch Test
20 has a special DIODE TEST function that reads
the forward voltage drop across the diode.
Another usefu l function is t he continuity test.
In this mode, the Touch Test 20 emits an audi-
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Suggest retail price is $35.95
Contact your local dealer or PANAVISE today.
PANAVISE PRODUCTS. INC.. 2850E. 29THST.. LONGBEACH. CA. 90806. (213) 595-7621
CIRCLE 47 ON FREE INFORMATION CARD
The world of
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2500 So. LaCienega Blvd.
Los Angeles, California 90034
Put Professional Knowledge and a
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ble tone that varies in proport ion to t he resis-
tance measured.
The Touch Test 20 can also be used to mea-
sure capacit ance . It does so for capacitances
from I picofar ad to 200 microfarads over thr ee
ranges. The listed accuracy is I%. When the
Touch Test 20 was used to measure a lab-
calibrated, 0.334 micr ofarad capacitor , the
unit measured it as 0.333 microfarads. A com-
ponent-test adaptor is provided which simpli-
fies the connection of capacitors, resistors, and
other devices to the front-panel jacks.
For thos e who need to make conductance
measurements, the Touch Test 20 will do it for
conductances from 0.01 nanosiemens to 199.9
nanosiemens. The listed accuracy is 0.2%.
Thi s featu re is useful when testing insulation
or in any sit uation where extremely high resis-
tances are involved.
The Touch Test 20 is neatl y packaged in a
2.9X6 .4X7.5-inch case. The unit weighs less
than three pounds and is powered by a charger-
type unit (supplied) for fixed operation or by
three, "D-t ype", lead-acid cells for port able
operation (a line-operation-only model is also
available). The lead-acid cells will operate the
unit for up to six hours . The cells take 16 hours
to recharge.
The instruction manual is quit e complete
and covers theory of oper at ion, service, calibra-
tion, and other techn ical topics. There is a full
schemat ic and several pages of interior photos
to aid in part s identificati on. The unit is cover-
ed by a one-year limited warranty.
The Touch Test 20 is a pleasure to use and
you have to try it to appreciate it. The Touch
Test 20 has a suggested retail price of $467.00
with the lead-acid cells, $435.00 without. R-E
continued on page 30
29
scale) voltmet er as a standard, I did some
quick tests and found that the model MAl H's
accuracy (at least on the voltage ranges I
checked) fell well within 0. 1%. That's ample
accuracy for practical service work.
Overall, it's a nice-looking instrument, and
very easy to use. The meter scale and range-
and funct ion-selector-switch are on the front
panel; the test leads plug into jacks on t he top
of the case, which keeps them out of the way.
Four jacks ar e used: COMM ON, OHMS, VOLTS
AND AMPS (ACjDC) , and the I,OOO- VOLT range.
Those jacks are the recessed type, so no bare
metal is exposed. The test-lead tips are novel
and handy. They have very short, sharp tips,
for probing closely-spaced points. J ust above
the tips is a set of springs allowing them to be
plugged into any standard banana jack. A pro-
tecti ve collar is built into the handle, to prevent
accidental contact wit h potentially dangero us
voltages and curr ent s.
The'model MAl H has a suggested list price
of $74.00 for the meter and test leads. A carry-
ing case is available for $22.00. From BBC-
Metrawatt-Goerz, 165 Fieldcrest Ave, Raritan
Center, Edison, NJ 08837. R-E
EVER- RESPONSIVE TO THE NEE DS OF THE
electronics indust ry, the Heath Company
(Benton Harbor, MI 49022) has introduced a
compact , hand-held frequenc y counter de-
signed for portable use. The model IM- 2400
covers a frequen cy range of 50 Hz to 512 MHz
and uses five rechargeable nickle-cadmiurn
cells (included) .
Published specifications include a typical
sensitivity of 10 millivolts, with 25-millivolt
sensitivity guaranteed throughout the range of
the unit. Input impedance is claimed to be I
megohm shunted by less than 20 picofarads in
the 50-Hz-50-MHz range; 50 ohms in the
40-512-MHz range. Input protection is 150-
volts RMS to 100 kHz, dr opping to l O-volts
RMS at 50 MHz. Input prot ecti on in the
40-512-MHz range is 5-volts RMS. The time
base uses a 10-MHz master clock wit h a listed
stability of I part per million. Temperatu re
stabilit y is claimed to be 10 parts per million
from 0 t hrough 40 degrees Centigrade.
Time bases of I or 0.1 second can be selected
from the front panel. Resolution is determined
by the range and time base chosen. With the
RANGE switch in the 50-Hz- 50-MH z position,
and t he TI ME BASE switch in the l- second posi-
EQUIPMENT REPORTS
cont inued from page 29
THERE'S A NEW ENTRY INTO THE FIELD OF
measuring equipment, the BBC-Metrawatt-
Goerz model MA l H analog YOM. The model
MAIH is small, but qui te versatile . There are
six AC-voltage ranges: 1.5 to 500 volts (full
scale). The nine DC-voltage ranges, 150 milli-
volts to 1000 volts (full scale) are selected by
the front- panel selector-switch (as are all of t he
meter's ranges) , but the zero- IOOO-volt range
(DC) uses a separate input jack. Current (AC
and DC) is measured over five ranges: 5 mA to
5 amps (full scale). An additional DC-current
range of 0-50 microamps (itA) can be selected
by switching the meter to the 150-milli-
volt- 50-mi croamp range. Because the meter
needle's deflecti on is the same for those two
ranges, the manufacturer decided to save a
switch position by comb ining them. To get the
proper reading, simply use the appropriate
meter scale. All voltage and current ranges are
calibr at ed in the 1.5- 15- 50 syste m, which sim-
plifies making readings.
Resistance is read on four ranges; X I , X IO,
X 100, and X 1000. The X 1000 range can be used
for checking semiconductors, since the current
is limited to only 0.083 mA, The meter also
has a DB scale, that measures from +5 to - 15
dB. Zero dB is defined as 0.775 volts across
600 ohms. A calibrat ing chart is included in
the instructi on manual, wit h instructions for
converting readings to dB, and the multiplier
factor used.
All ranges are selected by a single switch in
the center of t he panel. The meter scale is larg-
er t han average and the marki ngs are very clear
and easy to read.
The instruction manual gives instru ctions
and a calibrat ion chart for rough-checki ng
capacitors. We tr ied it out on a couple of filter
capacit ors, incl udi ng one known to have a bad
section. It read the values of the good sections
quite accurat ely, and caught the open one.
The manual is written in three languages:
English, French, and German. All function s
ar e covered, plus instructions for servicing and
recalibration if needed. The only thing missing
from the manual (that I noticed) was a state-
ment of t he unit's accuracy. Using a 0.1% (full
A95 and A97 Series
Line Transformers-
make it possible to con-
nect low-impedance
lines to mid- and high-
impedance inputs (or
vice-versa.)
A15TG Tone Generator
- 700 Hz signal he lps
check levels , connec-
tions, mixer inputs, a nd
cables.
A15LA Line Input
Adapter-converts bal-
anced low-impeda nce
mic input to line leve l
input.
A15HP High Pass
Filter-reduces low-
frequency noises and
proximity effect.
A15PA Presence
Adapter-adds inte lligi-
bility and brilli ance.
A15LP LowPass Filter-
reduces objectionable
high-frequency noises .
A15RS Response
Shaper-sibilance filter-
ing, plus flattened
response.
A15BT Bridging Trans -
former - mat ches bal-
anced or unba lanced
devi ces of different
impedances.
A15AS Microphone
Attenuator-prevents
overload.
A15PRS Phase
Reverser
for balanced lines .
SHURE
The Sound of the Professionals"
U
Sendforthe brochure, AL280F
Shure Brothers Inc., 222 HartreyAve.,
Evanston, IL60204.
In Canada: A. C. Simmonds & Sons Li mited
Manufacturers of highfidelitycomponents,
microphones , sound systems and
related circuitry.
Low-
Frequency
Noise
Lack of
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Sibilance
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cure the 10 most
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CIRCLE 46 ON FREE INFORMATION CARD
fact: These 10 problem solvers in
your toolbox are like 10 new tricks up
your sleeve . Or 10 hours of saved
time . Or money in the bank. They
make molehills out oftroubleshooting
mountains, without soldering, or
splicing, or internal equipment
modif ications.
Problem: Solution:
Phasing
Input
Overload
30
(/)
a
Z
o
a:
f-
a
w
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W
6
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a:
tion, the resoluti on will be 10 Hz; wit h t he
TI ME BASE switch in the O.I-second position,
t he resolut ion will be 100 Hz. Wit h the RANGE
switch in th e 4D-512-MHz position, and the
TIME BASE switch in t he l -second position, the
resolution will be 100 Hz; wit h the TIME BASE
switc h in t he O. I-second position, the resolu-
tion will be I kHz.
The modelIM-U OOis, of course, a kit and,
although I took great care in assemb ling t he
uni t, I did have one serious probl em; a solid
short bet ween t wo parallel traces on the
print ed-cir cuit board . When I could not find
the source of the probl em, I finally t ried to
eliminat e it by gouging a deep channel in the
board between the two shorted tracks. Doing
that got rid of the problem and I can only guess
that it was caused by a tiny bit of metal t hat
was imbedded in the board itself.
Three methods of calibrat ion are outlined in
the instructions; using a standard communica-
tions or AM broadcast receiver, using anot her
frequency counter and a signa l generator, or
using a laboratory-standard frequency genera-
tor. I used the second method and then
checked t he calibrati on against anot her fre-
quen cy generator as well as a laborat ory-st an-
dard generat or. The result s were well within
t he publi shed specificat ions.
Th e qual ity of the service manual is always
important, and, as usual, Heath has done an
excellent j ob. Included wit h the manual is a
large fold-out schemat ic and a complete tech-
nical descripti on of the ci rcuitr y. All solid-
stat e devices are list ed with t heir circ uit ident i-
fication number, their Heath part numb er,
and, where possible, subst it utes . All pin-outs
and t ransist or leads are clearl y identified.
The model IM-UOO measur es 1'1, X 3'/ , X
8'/, inches. The display uses LED' s t hat,
t hough easy to read under any lighting condi-
tions, consume quite a bit of current , making
use of t he opt ional battery elimi nator/charger
a good idea. An opt ional telescopic ante nna
wit h a BNC fitt ing (to match the one on the
unit) is also available.
Ail-in-all, if you take your t ime building the
mode l IM-2400, and t reat it with any degree
of care, it should per form well for many years.
The mode l I M- U OO se lls for $ 144.95
($ 190.00 assembled); t he optional batter y
elimi nator/charger sells for $4.95 . R-E
IN A FIELD OF RAPIDLY CHANG ING CONSUMER
electr onics, Radi o Shack (1400 One Tandy
Ce nter, Fort Wort h, TX 7610 2) stayed with
their keyboa rd-entry programmable scanner,
t he model PRO- 200f , an unusuall y long
length of time. That scanner was a lead item in
their catalog for many years. Now, a new top-
of-the -line programmabl e scanner, the model
PRo-2002, is dominating the Tandy line.
The new scanner is no miniature; it is virt u-
ally the same size as its predecessor. Frequency
coverage is broader than some competitive
units and includes the following ranges: 30-50,
108-1 36, 138-174, and 4 1D-5 12 MHz. That
means that the often-overlooked Feder al gov-
ern me nt and militar y alloca t ions in the
138-1 44 and 410-420 MHz segments of the
spect rum are available to the listener.
Frequen cy steps for scanning and searching
are at 5-kHz intervals on low and high band,
12.5-kHz int ervals on UHF, and 25-kH z inter-
vals in the AM aircra ft band . There.is no way
to extend the uni t' s frequency limits, as is pos-
sible with some ot her scanners.
The model PRo-2002 is a 50-channel mi-
croprocessor-controlled, freq uency-synthe-
sized progr ammable scanner. Frequencies en-
tered are sto red in five memory banks tha t can
be called up in any combination. Sca nning rate
is select able (six or three channels per second),
as is search rate (eight or three ste ps per sec-
ond) . Another featur e is the abili ty to store
five separate search ranges, one in each of the
five memory banks .
The scanning receiver uses eit her an integral
whip antenna or an external antenna, connect-
ed using a rear -apr on Motorola-type jack.
Additional rear-apron connect ions include a
TAPE-OUT jack for recording and an external-
speaker jack. A two-pin recessed jack for DC is
also available for mobile operation. The AC
line-cord is permanentl y attached.
A 9-volt batter y (not included) is used to
ret ain the frequencies in memory when the AC
line-voltage is int errupted. The battery is
accessibl e from t he back of the unit. The fluo-
rescent display provides frequency, channel
PriceWithout sacrifice.
HITACHI \'-3028 &\'-1528
Put a provenHitachidual-trace oscilloscope onyour bench
foras littleas $735. OurY152B15MHz model includes un-
precedented sensitivity(l mY/ div.) ...lOX sweep magnif-
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input...and more. Need greater bandwidth? Our Y-302B
model is the only30MHz dual-trace scopewithsignaldelay
line priced under $1000, with all the above features, to
make your 'testing operations fast, easy, and accurate,
Reliability is exceptional, too. (As 'you'd expect from a
manufacturer with over 20 years of experience "outseop-
ing" the competition.) So exceptional, in fact, that Hitachi
qualityis backedby a 2-year warranty...the longestin the
industry. Whether you use it for teaching or repairs, for
video, audio, or computer testing, you can't find more
scope for your dollarthan at Hitachi. Writeformoredetails.
Hitachi..:rhe measure
of quality
Y-152B15MHz Dual Trace $735*
Y-302B30 MHz DualTrace $995*
*Probes included.
@~ J ! ~ A ~ i ! j J
175Crossways Park West
Woodbury, NY11797
(516) 921-7200

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CD
CD
.....
CIRCLE 39 ON FREE INFORMATION CARD
31
City, State Zip _
Name (print) _
IT SEEMS HARD TO BELIEVE THAT JUST
a few years ago, the only economical means
available to copy radioteletype was the tele-
print er-a part icularly cumbersome, noisy,
mechanical behemoth.
Recent improvements in digital technology
have now made possible a variety of attract ive
alternatives, not the least of which is the new
programmable scanner users. Sharp selectivi-
ty, is very difficult to achieve in low-cost con-
sumer radios.
Selectivity is listed as 9 kHz at - 6 dB
and 15 kHz at - 50 dB. Best IF rejection
occurs at 154 MHz ( - 80 dB). An IF frequen-
cy of 10.7 MHz is normally found in all Radio
Shack scanners.
The priority channel is sampled every three
seconds, causing a 100-millisecond interrup-
tion of whatever scanner function happens to
be in operation at the moment. Nor mally that's
not a problem.
The DELAY function provides a 3-second
hold on any channel searched or scanned that
becomes active when checked. That allows
reply time for the other units duri ng two-way
communications reception. Without the DE-
LAY function, rescan or search will continue
immediately after the carrier disappears.
The unit will accept all normal narrowband
FM signals, 7 kHz. One crystal and one
ceramic filter are used to tighten up the IF
bandwidth; the second conversion frequency is
455 kHz. Squelch sensitivity is approximately
I microvolt (signal plus noise-to-noise at 25
dB). Power consumpt ion is nominal; 19 watts
duri ng AC operation and 10 watts during
mobile use.
While the model PRG-2002 is slightly more
difficult to operate than some competit ive
units, the routine is easy to learn. An audio-
tone generator beeps each time a program key
is pressed, confirming that the command has
been entered.
Another of the unit's features is the window
detector; when the receiver stops on a search-
discovered channel, it stops on the center fre-
quency. That means that the frequency dis-
played will be accurate, even though there is a
strong carrier.
We found the overall RF sensitivity to be
quite good, nearly equal to a much higher-
priced competitive scanner. It is certainly ade-
quate for the majority of applications. Search-
rat e programmability and search-direct ion
choice (up or down) are also advantages, add-
ing to the flexibility of the unit. A CLEAR but-
ton allows the user to remove an accidentally-
entered frequency.
All in all, we were pleased with the Radio
Shack model PRG-2002 scanning receiver. It
sells for $399.95. R-E
Assembled
and Tested
function, pressing the MONITOR button will
automatically insert that frequency into mem-
ory in place of the channel being displayed. If
you attempt to program an out-of-range fre-
quency, an error message will be displayed.
The Radio Shack model PRG- 2002 uses I
LSI microprocessor, I LSI phase-locked loop,
9 CMOS integrated circuits, 13 additional
IC' s, 44 discrete transistors, and 75 diodes.
Sensitivity on the AM aircraft band is nomi-
nally 1.0 microvolt ( 10 dB signal-to-noise ratio
at 60% modulation) ; low and high band FM
sensitivity is 0.5 microvolt, and UHF sensitivi-
ty is 1.0 microvolt-( 20 dB signal-to-noise ratio
at 3 kHz deviation).
Lowand high band spurious-signal rejection
(at band center) is 50 dB; UHF is not speci-
fied. UHF spurious signals (especially primary
images) have been a common complaint among
Introduce yourself to the wor ld of
computers. Speak their language, feel their
sensors and get t o know them inside and out.
FutureTec 180\!) is a complete Z-80 base
computer developed by electro nic educators
and is all you need to get started in the fast-
growing world of computers. This is a hands-on,
user oriented computer now off ered at the special
introductory price of $225. Satisfaction guaranteed
or return within ten days for full refund.
FutureTec 180 can open doors for you into a world
of scientific data that is as far reaching as space it self . How do
computers think? What is a memory device? What is address decoding
to peripheral devices? Answers to these questions and many more are
covered in our easy step-by- step home instruction manual.
Our FutureTec 180 computer includes a spacious mahogany case with
built-in power supply and reserve capabilities for external application,
Powerful Conceptv software monitor system which allows machine language
programming ease and full on-board display section with tone indi-
cator for audio-visual reinforcement makes learning easier. Automatic scrolling
is incl uded plus telephone-type keyboard for ease of operation. Execution of
your program can be stopped any time, memory address or registers can be
changed and your program can be continued with single key stroke.
In fact 25 keyboard functions like data search, comp uting and
tracing jump relatives and hardware testing facilities makes
a truly user friendly oper ating system.
Expe rience a 180
0
turn in your career - send
today for your FutureTec 180 computer.
GETTOKNOW
COMPUTERS
number, delay, priority, channel and search
bank, manual mode, program mode, search
mode, and lockout symbols. The display is
quite bright and easy to read.
The model PRG-2002 contains an internal
digital clock that displays hours, minutes, and'
seconds. A rear-apron slide switch allows the
clock to be disconnected if desired during
mobile operat ion to prevent battery drain when
the vehicle is unatt ended for long periods of
time.
A PRIORITY function may be used on any of
the 50 channels; when activated, a signal
appearing on the channel will automatically
cause the scanner to lock on that channel until
the signal is no longer present.
Search, lockout , and delay functions are
conventional enough and work welL If an
acti ve frequency is found during the search
To order call 216-961-4041 or wri t e P.O. Box 5784 , Cleveland Ohio 44101
Price $225 each DPersonal Check DCashiers Check/Money Order
o VISA DMasterCard (Bank No
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SPECIFICATIONS
2-80 CPU (Central Processing Unit)
Advanced Machine Language
Concept Software Monitor
Clock Frequency 2MHz
1Kx8RAM
2716,2KROM
Regulated Power Supply SV @1.2 amp
Dual Transistor Display Drivers
High Brightness LED's J
40 Pin Edge Connector for Expansion & Peripherals
Fully Expandable National

RmlREerECl80
Allow 4 to 6 w eeks for delivery .
REDUCE SHOCK HAZARD. NEW, VARIABLE
ISOLATION TRANSFORMER, ONLY $143.75.
Here's extra safety for person nel-
protection for equipment. Absol utely
necessary for servicing or testing any
transformerless equipment-industry,
lab, school or field .
New WP-29 ISO-V-AC lets you set
isolated output voltage to precise
value you need. Monitor either
isolated output or direct input
voltage on panel meter. It's the most
versatile isolation transformer you
can buy!
Two isolated outputs: polarized
standard two-wire socket and banana
jacks (so isolated AC may be applied
directly to circuit points). Completely
port able. Thermal over load prot ection
of transf ormer and output prot ected
by 2-amp. circuit breaker. Output
leads suppli ed.
WT-540B
For safety.
Detects AC leakage in
appliances and equipment.
Calibrated at 0.5
and 0.75 mA.
$36.75
AC Leakage Tester
WP-28 Porta-Isotap
150 VA isol ated, 500 VA
direct. Output 105-130V.
TV adapaters supplied.
Carryi ng strap.
$57.00
WP-27A Isotap II
400 VA isolat ed only.
Outputs 25 to 150V AC
in 5V steps.
$79.95
,--- --- - - - - VIZ RELIABILITY.
VIZ is a 50 year- old company. Our instruments are fully warranted,
parts and labor, for a year . All units tested to NBS standards.
We offer service and parts availabi lity for a minimum of ten years.
Over 15 repai r depots in U.S.A.
WP-26A Isot ap
400 VA isol ated,
500 VA dir ect. Outputs
at 105, 120 and 135 V.
$77.00
VIZ ls ot a p" isolation transformers
Want full technical details and a demonstration? Call toll -free, 1-800-523-3696, for the VIZ distributor near you.
Look to VIZ for value, quality and availability.
Over 70 instruments in the line.
VIZ Mfg . Co., 335 E. Price St., Philadelphia, PA19144
CIRCLE 73 ON FREE INFORMATION CARD
C.E.1:
of t he Mini-Reader is that it can be used as an
audio-frequency counter, capable of reading
from 0-79 kHz.
OUf test
We plugged the Mini-Reader into t he exter -
nal-speaker jack of a popular genera l-coverage
receiver so t hat we could see if the uni t per-
formed as claimed. Tuning in ' the familiar
audio "diddly-diddly" of radioteletype, we ad-
j usted the receiver tuning dial unti l the Mi ni-
Reader's " ready" light blinked, indicating that
we were cent ered in t he audio passband. When
the appropriate functi on key was pressed, t he
latest world news began to move across the
display.
Next, we tuned in the CW portion of t he
80-meter amateur band. Sure enough, t he
Mini-Reader worked perfectly. Admittedly,
sloppy fists made some copy difficult, but even
those could still be interpreted!
Perhaps most important of all, our general-
coverage receiver could detect no RF interfer-
ence from the unit. This was indeed a pleasant
surprise. Even the earlier SWL model , though
well-shielded, caused some interference at cer-
tain frequencies. The Mini-Reader was com-
pletely clean.
All in all we were very pleased with the
Mi ni-Reader ; it did everyt hing that was asked
of it, and more. Kantronics has done well in
providing so much in such a small package.
The new Kantronics Mini-Reader is an
impor tant step forward in accessory technol o-
gy. It lists for $314.95, and is available from
your local Kantronics dealer. From Kantron-
ics, 120 I E 23rd St reet , Lawrence, KS
66044. R-E
FOR TECHNICIANS WHO ARE READY
FOR THE FUTURE
of no importance.
On Morse receptio n, the Mini -Reader will
track automatically at speed of 3-80 words-
per-minute. Code practice wit h the little unit is
a snap; simply insert a key into the appropriate
jack and watch the display as you practice your
keying. This will show up a sloppy fist every
time. At t he press of a button, the speed of the
received Morse code can be displayed.
The Mini -Reader will also decode 100- or
300-baud ASCII. Whi le the ASCII message is
hard to follow at t hose speeds, the device can
display individual characters to analyze data
bursts.
When not being used to monitor the busy
radio bands, the Mini -Reader can be used as a
24-hour clock, displaying hours, minut es, and
seconds. The versatile littl e unit can also be
used as a 24-hour timer. One unusual feat ure
adia-
Eleclranil .
SPECIALREPRINT
BUILD ABACKYARD SATElliTE TV RECEIVER
Kantro nics Mini -Reader.
Designed for reception flexibility, t he Mini -
Reader could well be t he most versat ile reader
available to date. It is certainly the most com-
pact reader available at this wri ting.
About t he size of a standard calculator (5'/.
X 3'/ , X 1'/ . inches), the compact Mini-Read-
er feat ures a bright , 10-character, fluorescent
alphanumeric display. The characte rs dis-
played move from right to left , and the display
is easy to read.
It compares very favorably with its prede-
cessor, the Field Day 2 SWL model. And it's
$150.00 cheaper!
Radioteletype (RTTY) messages are dis-
played at 60, 66, 75, and 100 words-per-min-
ut e. Si nce t he internal active-filter monitors
the " mark" signal only, "s hift" is of no conse-
quence. Normal or inverted mark/ space is also
r - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ~
: ...1e-EIeat.-1a 8/81 Please print
: Satellite TVReprint s
.45 East 17th St reet (Name)
New York, N.Y. 10003

: (Str eet address)

I w a nt re pri nts @ $6 .00 U.S . each, post-
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Send away today for your 36-page book -
let containing complete reprints of all
seven articles in t he series on Backyard
Satellite TV Receivers by Robert B.
Cooper Jr.
This all-inclusive report gives you all the
data you need to build your own Back-
yard Satellite TV Receiver.
TELLS ALL ABOUT domestic satellite
communicat ions, with full details on how
you can pull those elusive TV signals from
space.
LEGAL REQUIREMENTS, technical
specif ications, and how you, the home
constructor, can meet them. Find out
what mechanical and elect ronics skills
you need.
RECEIVER CHARACTERISTICS, tech-
nical details and speci fications, along
with examples of act ual receivers built at
comparati vely low cost.
Don't miss out again!
ANTENNAE DESIGN... and exactly how
you can bui ld a spherical antennae, while
keeping total earth station cost for the
complete system under $1,000.
THE FRONT END is cr itical when you
build your own system. We help you ex-
plore several different approaches to
making one that will work for you.
RECEIVER-SYSTEM hardware, and
how it goes together to brinIJ you direct-
from-satellite TV reception In your own
home.
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EIIIPIEIiT1111 TRIIIIIIII
IIIITIERSCllll CIIIIITCI.
NTS TRAt GINUITES YOU TO EXPLO E IC OCOM TERS,
AI. SYSTEMS RE, WITH STATE- -THE-ART EOUIP NT
YOU ASSEM LE KEEl!
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Wit hout question, microcomputers are the
state of the art in electronics. And NTS is the
only home study school t hat enables you to
train for this booming f ield by working with
your own production-model microcomputer.
We' ll explain the principles of trouble-
shooting and testing your microcomputer and,
best of all , we'll show you how to
program it to do what you want.
You'll use a digital multimeter, a
digital logic probe and other
sophisticated testing
gear to learn how t o
localize problems
and solve
them.
We
believe
that training
on production-
model equipment,
rather than home-made learning devices,
makes home st udy more exciting and rele-
vant. That's why you' l l f ind such gear in most
of NTS's electronics programs.
For instance, to learn Color TV Servicing
you'll build and keep the 25-inch (diagonal)
NTS/HEATH digital color TV.
In Communications Electronics you'll be
able to assemble and keep your own
NTS/HEATH 2-meter FM transceiver, plus test
equipment.
But no matter which program you choose,
NTS's Project Met hod of instruction helps you
quickly to acqu ire practical know-how.
Send for the full color catalog in the elec-
tronics area of your choice-discover all the
advantages of home study with NTS!
NTS also offers courses in Auto Mechanics,
Air Conditioning and Home Appliances. Check
card for more information.
1.
2.

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Simulated TV Reception 4.
I
I 3.
D Check if interested in G.I. information.
D Checkif interestedONLYin classroomtrainingin Los Angeles.
Apt. Ci ty _
State
Please rush FREE color catalog on course checked below
D MicroComputers/Mic roProcessors D Auto Mechanics
D Communications Elect ronics D Ai r Conditioning
D Digit al Electroni cs D Home Appliances
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-----.. - - - - . _ - - - - - . _ - - - - - - - - - - - - - - . _ ~
DiSNATIONAL
TECHNICAL
SCHOOLS
1. The NTS/ Rockwell AIM 65
Microcomputer Asingle board unit
wit h on-board 20 column al phanumeric
printer and 20 character display. A 6502-based
unit 4K RAM, expandable. 2. The NTS/KIM-l
Microcomputer A single board unit wit h 6 digit
LED display and on-board 24 key hexadecimal
calculator-type keyboard. A 6502 based
microco mputer with 1K RAM, expandable.
3. The NTS/HEATH H-89 Microcomputer
features floppy disk storage, "smart "
video termi nal , two Z80 micro-
processors, 16K RAMmemory, expand-
able to 48K . 4 . The NTS/HEATH GR-
2001 Digi tal Color TV(25 " diagonal)
features specialized AGC-SYNCmut ing,
fi ltered color and new sol id-state hi gh
voltage tripler rectifier.
39
TF040 a-Digit LCD ..
Frequency Range : 10Hz- ...,. __ ..
40MHz (t o 400MHz with TP600)'
Sensitivity : 40mV rms Timebase ~ ,
accuracy : better than 0.5 ppm. Batt ery li fe: I ~ _ /
Typically 80 hours ~
PFM200 a-Digit LEDHand Held Meter
Frequency Range : 20Hz-200MHz (to 600MHz with TP600). Sensit ivi ty: Typi call y
10mV . Timebase accuracy : bett er than 2 ppm. Batt ery lif e: Typi cally 10 hour s
. $99.95
TP600 600MHz Prescaler
Frequ ency Range : 40MHzto 6OOMHz. Sensitivity : 10mV. Output : Typically
500mV peak-peak. $79
TF200 a-Digit LCD
Frequ ency Range: 1OHz-2ooMHz (to 600MHzwi t h TP600) Sensit ivity : 10mV rms
20Hz-100MHz, 30mV rms 10Hz-20Hz, 1ooMHz-2ooMHz. Timebase accuracy : hetter
than 0.3 ppm. Battery life: Typicall y 200 hours . $299 (inc. batt s).
TO ORDER CALL TOLL FREE: 800-526-5311
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THANDAR ELECTRONICS INC
THANDAR SATISFACTION WARRANTY:
If for any reason, wh atsoever, you are not completely satisfied with your purchase, return it
with in 30 days of purchase date for a full refund - it' s as si mple as that!
PO. Box 8247, Haledon, New Jersey, 07538 Tel: 201-790- 3141
CIRCLE 48 ON FREE INFORMATION CARD
STOP PRESS TG102 2MHz Function Generator $299
TG105 5MHz Pulse Generator
Period : 200nsec to 200ms (5MHz to 5Hz). Pulse width : 100nsec to 1ooms. SOO
output range : 0.1V-l0V toTTL output. Sync. output. Operatin g modes: run,
external trigger, exte rnal gate, manua l t -shot or gate. Complement and square
wave. $199
DM235 3Y2Digit; 21 ranges; 0.5% basi c accuracy; $69.95
PDM35 3Y2Digit; Hand held ; 16 ranges; 1% basic accuracy; $39.95
CJ)
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FIG. 2-THIS 11-stage ring counter is an early (1963) example ofa TTL IC.
FIG. 1-SIMPLIFl ED SCHEMATIC of a typ ical RTL device, the MC792P, a triple 3-input NORgate.
earlier schemes used to couple tran-
sistor stages. Diode-coupled and direct-
coupled methods were unsatisfactory
because of IC process-variations, and
resistor-capacitor coupling suffered
from lack of speed. In 1961 , James Buie,
an IC designer at Pacific Semiconduc -
tors (now part of TRW), devised a
coupling scheme that isolated transistor
stages by using coupling transistors; his
method proved to be relatively inde-
pendent of process variation. Buie' s
work evolved into today' s TIL IC (see
Fig. 2).
By the mid-1960' s, Fairchild had
turned to linear IC' s. Robert Widlar,
then one of the designers at Fairchild,
was respon sible for the first practical IC
op-amp, the pA71fJ. Widlar also de-
signed the /-iA702 high-impedance op-
amp, the first IC comparator (/-iA71O),
and the first compensated IC op-amp,
the /-iA74I. Widlar' s design ideas
seemed radical in his day because he
used transistors to replace "simple" cir-
cuit elements such as resistors.
While bipolar IC technology was de-
veloping, some designer s concentrated
on the FET (Field-Effect Transistor)
and its applications. RCA Laboratories
was especi ally active in that area of
semiconductor deve lopment. In 1957
John Wallmark of RCA was granted a
patent for an FET. He saw the FET not
as merel y a discrete device , but as
groups of devices connected together
and forming logic patterns for com-
puters. Hi s concept, which he called
"integrated logic net s, " wouldn 't lead
to actual device s until a few years
later, and then under someone else' s
supervision.
In 1959Steven Hofstein , a recent re-
cruit to RCA, and Frederic Heiman,
another young engineer, set to work to-
wards a specific goal. The y wanted to
produce a silicon-insulated-gate FET
that was to be used in a multi-thou sand-
transistor circuit. The y succeeded in
1962. (See Fig. 3.)
Hofstein and Heiman demonstrated
the IC capabilities of their MOSFET
(Metal Oxide Semiconductor Field Ei-
speeding production of the end-product.
The integrated circuit was the logical
solution.
The first IC's
The first commercially available
mono lithic IC was a four-transistor, RTL
(Re sistor-Transistor Logic) flip-flop in-
troduced in 1961 by Fairchild Semicon-
ductor. By the end of 1961, production
quantities of logic IC' s were being pro-
duced by both Fairchild Semiconductor
and Texas Instruments. Some early
contracts for the " mass-produced" IC' s
came from the military (TI supplied spe-
cial circ uits for the Minuteman missile
program), and from the National Aero-
nautics and Space Administration, with
Fairchild the supplier. An RTL circuit-
a triple, 3-input NOR gate-is shown in
Fig. I.
Transistor-Transistor Logic (TIL)
came about because of the drawbacks of
Ten years after Bell Laboratories'
1947 demonst ration of their point-con-
tact transistor, Jack Kilby, of Texas In-
st ruments , set to work on building elec-
tronic circuits out of discrete semi-
conduct or components. His intention
was to show his superiors that entire
circuit s could be made out of a " solid"
piece of semiconductor material. Early
in 1959 such a " solid circuit " was shown
at the Institute of Radio Engineer s
show. That circuit was a flip-flop and its
resist or s, capacitors, and transi stors
were made entirely from monolithic
germanium.
At about the same time, Robert
Noyce, then manager of research and
development at Fairchild Semiconduc-
tor, decided to tum his own ideas into a
practical device. (His ideas were to use
diffused or deposited resistors, isolate
on-chip devices with reverse-biased p-n
junctions, and interconnect circuit ele-
ments through holes in the silicon diox-
ide by the evaporation of metal onto the
surface of the wafer.)
Today Kilby and Noyce are bot h
credited with the invention of the IC,
although, at the time of their work,
trends in the semiconductor industry al-
ready seemed to point to the develop-
ment of integrated circuits, Advances in
manufacturing processes had enabled
semiconductor devices to saturate the
market by 1960. One problem remained:
As the products that used those discrete
de vices grew in complexity, the number
of interconnections between the devices
al so grew. It reached a point where
produc ts couldn't be assembled quickly
enough to use all of the available de-
vices . What was needed, nowthat semi-
conductor s were plent iful, were ways of
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DRAIN
FIG. 3-CROSS-SECnON of a metal-oxide semiconductor devi ce. By 1963, RCAhad built IC's contain-
ing several hundred of these each.
THESE EARLY (1962) IC' s from General Electric contained as many as 18 transist ors and 66 tapped
resistors. Cont rast that wit h the compo nent count of modem VLSI IC's.

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izmg. Intel' s design was approved by
Busicom in October 1%9 and in June
197l , Intel introduced the 4004 micro-
processor family (designed by Federico
Faggin, now president of Zilog). The 4--bit
4004 was the first microprocessor; it was
built using p-channel MaS technology,
and measured 150x 110mils. Just as the
increasing complexity of discrete tran-
sistor circuits had seemed to point to the
development of the integrated circuit,
so too the increasing complexity of
some random logic designs now seemed
to show the need for a centralized com-
put ational/control element. Intel. how-
ever. was not alone in producing the
"calculator-like" Ie' s. Fairchild, Ameri-
can Microsystems, Texas Instrume nts,
Electronic Array s. Rockwell, and Mos-
tek all had contracts to build the de-
vice s. The MaS IC had truly come into
its own . Shipments increased in one
year from $15 million to $35 million and
by the end of 1970, the total was over
$100 million. The importance of MaS
technology had grown faster than most
people in the industry had expected.
Other advances in state-of-the-art IC
manufacture accelerated the growth of
an alre ady expanding industry . The use
of an electron beam to produce the
masks used in IC photo-lithography rad-
METAL
and most of those calculators were
made in Japan. Busicom wanted a set of
Ie' s that would support a family of cal-
culators, with ROM' s used for custom-
feet Transistor) by building a 2,5()()2-mil
(a mil is I/IOOO-inch) chip containing 16
MOSFET' s by the end of 1%2. By 1%3
RCA had built chips with several hun-
dred MaS devices.
Although MOSFET Ie' s promised far
simpler processing, much less power
consumption, and greater levels of in-
tegration than bipolar IC's, there were
still formidable problems in their man-
ufacture. Among those were oxide de-
fect s and an extreme sensitivity to static
charge. The MOSFET's were also much
slower and required different supply
volt age s than bipolar devices. Because
of those problems , and others, few com-
panies stayed very long with MOSFET
technology. In fact , for most of the
1960's the re were only two companies
producing MaS Ie's-General Micro-
electronics (founded in 1%3) and Gen-
eral Instrument. Even RCA, which had
done a considerable amount of pioneer-
ing work in MaS, shifted its main con-
cern back to the more lucrative bipolar
devices.
But the industry kept a watchful eye
on MOS technology, waiting for new
developments. The wait wasn' t a long
one , as we'll see.
The first ROM (Read-Only Memory)
appeared in early 1%7. Offered by Fair-
child, the ROM was a 64-bit MaS de-
vice arranged into 16 4bit words . A
1,024-bit ROM was offered by Philco-
Ford a year later. As ROM' s increased
in density, the term firmware (for soft-
ware in ROM) soon became popular.
Enter the microprocessor
In August 1%9 Busicom Corporation
of Japan commissioned Intel Corpora-
tion to design calculator Ie' s. At that
time many of the MaS Ie' s produced in
the United States went into calculators,
SOURCE
43
FIG. 4-THE INTEL 8086, a 16-blt LSI (Large-Scale Integr ation) microprocessor . Not e the di ff erence in
density between this chip and the one shown in Fig. 2. (Photo courtesy Intel Corporation.)
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ically changed one aspect of IC manu-
facture, as expensive and bulky ruby
lithograph y equipment was made obso-
lete. As circ uits increased in density and
complexity, clean rooms became clean-
er still. Doping (the introduction of im-
purit y atoms into the silicon) methods
were improved. Ion implantation, accel-
erating impuri ty ions into silicon using
very high voltages , was a great improve-
ment over thermal diffusion. Ion im-
plantation' s initial use was for high-
den sit y memories, with Mostek Corpo -
ration being the first to use the method
in its IK p-channel dynamic RAM(Ran-
dom- Access Me mory). With increas-
ingly complex circuits, IC manufactur-
ers relied more on computer model ing
prog rams and computer-assiste d design
for circuit analysis and mask layout.
The first 8-bit microprocessor , the
8008, was offered by Intel in sample
quantities in early 1972. The price was
.$200. The 8oo8could be interfaced to the
standard memory products of the time,
and with its 14-bit addressing capabi lity,
could address as many as 16,384bytes .
The 125 x 170-mil device was being
shipped in "kits" (with memory and
peripheral IC' s) by the spring of
1973. By that time National Semicon-
ductor had demonst rated its general-
purpose controller/processor, a 4-bit
microprocessor that could be used to
build processors with word lengths of up
to 32-bit s. Rockwell had also joined the
race with its own 4-bit parallel proces-
THESE INTEGRATED CIRCUITS from RCA are
housed in "flat packs," one of the f ir st standard-
ized IC cases.
sor. AMI, Signetics, and Weste rn Digi-
tal were also deve loping processors.
Everyone seemed to be joining the
microprocessor competition.
Intel' s 8080 helped usher in the sec-
ond generation of microprocessors.
That n-channel device had four times
t he addressing capability and about ten
times the throughput of the earlier 8oo8.
The designer of the 8080, Masatos hi
Shima, later left Intel to join Zilog
where he des igned the Z80. Early in
1974, RCA introduced the first CMOS
(Comp lementary MOS) microproces-
sor. the 1802: the TMS lOoo, Texas In-
struments' best-selling 4-bit microcon-
troller, was also introduced. In March of
1974, Motorola finally took the wraps
off its 68oo microprocessor. The 68oo
was supported by RAM, ROM, and in-
terfacing Ie's, plus Motorola's Exor-
cisor deve lopment system. By the fall of
1975, nearl y 40 different microproces-
sors were avai lable.
The state of the art
As IC des igners took more of a sys-
tems approach to their creations, the
single-chip microcomputer was devel-
oped. The first 8-bit single-chip micro-
computer was Intel's 8048 (although
Michae l Cochran and Gary Boone of
Texas Instruments received the basic
patent for the single-chip microcompu-
ter in 1971). Today, there's a new gen-
eration of 16-bit microprocessors : In-
tel's 8086, Zilog's Z8000. Motorola's
68000, and National Semiconductor's
16000.
The RTL flip-flop introduced in 1961
had four bipolar transistors. Today, a
typical 16-bit high-performance micro-
processor, such as the 68000, has 68,000
transistors . The recent introduction of
the 64K RAM marked the beginning of a
new phase of IC technology, VLSI
(Very Large Scale Integration) .
VLSI is still basically in the develop -
ment stage. In 1978 the U.S. Depart-
ment of Defense initiated its VHSIC
(Very High Speed Integrated Circuit)
development program, designed to pro-
vide an impetus for VLSI work, with an
emphasis on speed. Contracts have al-
ready been awarded for the initial phase
of the six year, $210 million program.
Among other things the Federal effort
hopes to develop devices with up to
250,000 gates, using circuit features as
small as 0.5 micrometer (millionth of a
meter). Contrast that with the 13,000
gates and 3.2 micrometer minimum cir-
cuit feature of the Motorola 68000.
How best to use VLSI technology is
st ill uncertain, but one thing does seem
sure: VLSI will be used to build ever
denser memory chips, perhaps with a
million bits or more of RAM, and with
access times a fraction of that of today's
fastest devices . Some sayan entire
mai nframe computer will be possible
with a handful of fC's,
Early in the 1970's, 20-micrometer
line widths were common in IC circuit
geometries. By the mid-1970's those di-
mensions had been cut in half. As the
decade ended, advanced devices with 3
to 4-micrometer line widths were avail-
able. Some say that devices with line
widths of less than I-micrometer will be
common by the end of the 1980's.
Some views on the future of IC tech-
nology, especially those concerning
the future of VLSl, take on an almost
Christmas-wish aspect. Nevertheless,
consideri ng how far we've come from
that first four-transistor flip-flop, the
next 20 years could be very interesting
indeed! R-E
IF YOU' RE A REGULAR READER. YOU'VE
heard about TVRO stations-special
set ups used by cable-TV companies
and others to receive the four -gigahertz
(4,000 MHz) signals from satellites .
One of the most expen sive compo-
nent s of a TVRO system is the antenna.
The 8-Ball antenna described here is one
of the few that you can build yourself
and is rel ativel y inexpensive and easy to
align.
With it , and a couple of other special
components. you can watch blacked-
out sporting events . commercial-free
movies, and other choi ce televi sion
fare usually available only on cable-TV
systems.
What you need in addition to the an-
tenna are an LNA (a speci al Low- Noi se
Amplifier to boost the very weak signal
picked up by the antenna) and a down-
converter to process the 4-GHz TV sig-
nal so it can be viewed on an ordinary
TV set . You can also purchase a special
TV set that has a down-convert er built
into it if you wish.
Before going any farther, take a
minute or two to st udy the various
photographs of the antenna in various
stages of as sembly. The complete
TVRO antenna consists of a 12-foot
SATELLITE
TV
IITEIII
Before you can receive
satellite television, you need
the appropriate antenna.
This inexpensive
design can be built
from common materials.
H.D. McCULLOUGH
.. dish" or reflector that captures the
incoming signal and focuses it at the
waveguide horn feeding the LNA. This
art icle covers the construction of the
di sh. The 8-Ball' s dish consists of two
main sec tions . One is the steel frame
that provides a rigid, durab le support
fixture. The other is the wood-latt ice
assembly to which the reflector surface
(screen wire) is fastened. An important
feature of this type of construction is
that it is not necessary to build the heavy
met al frame to close tolerances . How-
ever. you should keep all the meta l ribs
within a half inch or so of their intended
posit ions.
The redwood latti ce is attac hed to the
frame with adju stable bolts about every
two feet vertically and every three feet
across. Those bolt s allow the latt ice
(hence the reflector surface) to be ad-
justed to conform to the precise curve
required. When adjusting the antenna.
the vert ical wood strips should be set to
within a sixteenth of an inch of the
exact curve .
The steel frame (see Fig. I) consists of
three horizontal ribs (HRI, HR2, and
HR3) and five vert ical ribs (VRI through
VR5) plus the rear legs and braces. The
frame is made from lIs-inch thick I I/2 x
Lattice preparation
There are five vertical latti ce strips
made oP/4X3-inch redwood. Two of the
strips are 10 feet long. and three are 12
feet long. Prepare them by drilling holes
according to the measurements shown
in Fig. 3. The strips can be stacked and
all drilled at once : or, better yet, drill the
three 12-foot pieces and then the two
la-foot pieces. The holes will take 1/4_
inch bolt s so use a 9/J6-inch bit : asse mbly
will be eas ier.
You 'll need nineteen 12-foot pieces of
3/4 x 2-inch redwoo d stock for the hori-
zontal ribs. Thirteen of those are used
as -is. To get the angles at the comers of
the latti ce (see FigA) cut two ot her
pieces to II feet 4 inches. two pieces to 8
feet 10inches"and two pieces to 6 feet 2
inches. The come r diagonal pieces will
be covered later.
To establish the curve in the vertical
directi on , the five 3/4 x 3-inch redwood
strips will be attac hed to the vertical
steel ribs with adjustable bolts as shown
in Figs. 5 and 6. Note that the spacing
bet ween the vertical steel rib and the
vertical wood strip is identical for all five
verti cal ribs at any specific distance up
or down from the middle horizont al rib.
Th us. we see from Fig. 5 that all five
verti cal strips are touching the steel ribs
at t heir centers. and that 24 inches up
and down from center . the space be-
tween the wood strip and steel rib is 13/ 16
inch for all/he of the ribs, At 48 inches
from each side of center. the spacing is
3
7
/32 inches. and it is 7
1
/4 inches at 72
inches from center. The combi nation of
t he vertical curve formed by properl y
setting the adj ustment bolts and the
curve formed by the horizontal ribs will
estab lish a precise reflector surface.
Ilh- inch galvanized angle iron. Each
hori zontal rib is cut through at the cen-
ter so it can be bent (see Fig. 2-a)
and sec ured wit h a brace (HB) and end
braces (HEB) . The angle formed should
be approximately 163 degrees. To estab-
lish the precise surface curvat ure with a
minimum of final adjustmen ts. the angle
must be set very accurately.
A very small error in the location of
the bolt holes where the brace and end
braces are attached to the horizont al rib
will cause a large error at the ends of the
rib. Position the rib and braces accord-
ing to Fig. 2-a and clamp them together
with "C" clamps or locking-type pliers.
Drill the holes and set the pieces aside
temp orari ly.
When the horizont al brace is properly
shaped and bolted. the angle and loca-
tion of the brace will be such that the
five points on eac h horizont al rib where
a vertical rib is attac hed will lie on a
circl e with a radius 000feet as shown in
Fig. 2-b. The procedure just described
sets the curve of the frame and. there-
fore. the reflector surface in a hori zont al
directi on.
2S"
50"
3"
ENTER
LINE
HEB
VERTICAL
RIBS
HB
NOTCH
,
10-15/1S"
ARC OF CIRCLE
WITH30 FT. RADIUS
HEB
STRAIGHT EDGE
S"
"'1
VR3__
HB _VR4
I
I
+
-I,
i--l- VRI
'0---
B1
J l
I
I ' I S" I S" I
I

I
I
53"
I
I
, -
I
I
I
I HB I
I
t

I
.-
J I
.
C
I I
I
I
I
I
53"
I
.
L
I
I
I
I
Bl HB Bl
I
I 'v
is
"
lS" 'yj:
H
1
3

:
'L , I
' "
V'B2
233/4"
:
/ BF :
THETWO
OUTER
STRIPS--.
ARE10'" ---------..
FT. LONG I
FIG. 3-THE FIVEVERTICAL LATTICE STRIPSare prepared by drilling holes according to t he measure-
ments shown. Three str ips are 12 feet long with ei ght holes; two are 10 feet long with si x holes.
T30' TORADIUSPOINT
b
FIG. 2-THE HORIZONTAL CURVATURE of the B-Ball ref lector is developed by the bend In the
horizontal ribs and by horizont al brace as shown in a. The f ive vertical ribs in b all lie on an arc that has a
radius of 30 feet.
NOTE: ALL MATERIAL 1-1/2X 1-1/2 X l IB-INCH ANGLEIRON.
VERTI CALRIBS EOUALLY SPACED
(APPROX. 3S" APART)
FIG. 1-THE METAL FRAME provides a rigid and durabl e support st ruct ure. The only critical factor in
its constr uct ion is the sett ing of t he angul ar bend in t he t hree hor izontal members.
DISTANCE
FROM
CENTER
1
_0:
72"
70"
I
if)
o
Z
o
c::
f-
o
W
--I
W
6
l
PARTS LIST
Wood lattice strips (5/aor 3/4-inch red-
wood) :
12"BOLT
70"
50"
26"
26"
3" CENTER
i :- L1N E
ANGLE
IRONRIB
LOCATIONSOF AOJUSTMENT
BOLTS, ON ALL VERTICAL
STRIPS ARESAME OISTANCE
UP & OOWNFROMCENTER
LINE. ALSO SEE FIG. 5
.1
3/4 X2 HORIZ.
STRIPS
3/4 X 2 HORI ZONTAL STRIPS 3/4 X3 VERTICALSTRIPS
<, ./
.h-:'
~ .
~
~
~
r::t/"
, .
-
1.1 .-
. -
I
: ~
A
~
-:;;;7
~ -, ;---7
13/16"
SPACING
24" FROM
CENTER
1-+-- - - -------- -70" - - ---- - - - ----+1
1-+-- - ----------72"'---- ------ ---+-l
FIG. 5-SIDE VIEWof the top half of one vertical rib with wood latt ice attached.
FIG. 4-THE REDWOOD LATTICE ASSEMBLY
shows the locations of the 36 adjustment bolts.
Those bolts set the curva ture in a vert ical di rec-
tion. The arc of curvature is again 30 feet.
1
8'
T
Quantity
1
1
1
3
6
1
1
1
1
1
4
2
1
1
2
2
2
2
1
1
2
2
Quantity
72
10
10
10
6
Quantity
22
3
2
Length
12 It.
12 It.
12 It.
10 It.
6 i n.
9 ft.
12 ft.
12 It.
12 ft.
91t.
16 in.
23
3
/ 4 in.
74 in.
104 i n.
32 in .
59in:
30 In.
30 in.
83 in .
92 i n.
aft.
4 ft .
Size
2 in . x 12 It.
3 in . 12 ft.
3 in . x101t.
Part no.
HR1
HR2
HR3
H8
HE8
VR1
VR2
VR3
VR4
VR5
81
82
8F
8R
83
84
85
86
87
88
RL
RLX
Bolts (1/4X20 t hread):
Length
314 in.
4 in.
5 in.
ain.
12 in.
Frame: The following are a1l 1V2x1V2-
inch, Va-inch thick galvanized or
pr imed angle iron.
Miscellaneous (quantities in parenthe-
sis):
' / 4-i nc h nuts (196)
'/4-i nch 10 washers (72)
No. a-1
1
/ 4-inch brass wood screws (140)
aluminum screen (26 inc hes x 75 tt .,
0.011 i n. dia. wire, 1/16 i n. mesh or
heavy-du ty 0.025 in. di a. wi re. lis in.
mes h)
sta ples (rus tp roof)
glue
inclinomet er
radius wire
anchor bolts (4)
" J" br acket s (4)
Note: Some of these it ems will be
called for In Part 2.
Assembling the frame
Prepare eac h horizont al rib as shown
in Fig. 2 by attaching braces HB and
HEB with .! -inch bolts .
Next. place t he three horizontal ribs
on blocks and attach the five vertical
ribs as shown in Fig. I and Fig. 7. Use
3/ 4-inch bolts. No te that. because of the
braces. eac h hori zontal rib will have a
differ ent number of holes drilled in it-
so be sure to get the ribs in their proper
positions. The top view in Fig. 2-b
shows how t he vertical ribs are posi-
FIG. 6 (right}-DETAIL OF LATTICE ATTACH-
MENT showing use of nuts and washers on ad-
justment bolt.
tioned (note that the bottom ofVR3goes
under BF).
Tight en the nut s only finger tight unt il
all the pieces shown in Fig. I are in-
stalled and then tighten them securely.
Whether assembling the 8-Ball from a
kit. or from scratch. you' ll find that
some holes may not align perfectly.
Make sure that everyt hing is located
properl y. then align the holes with a
tapered punch. Hold the pieces in place
with clampin g-type pliers while you in-
sert the bolts.
BOLTHEAO
OR NUT&
WASHERFOR
THE8" ANO
12" BOLTS
HORIZONTAL
WOODSTRIP
VERTICAL
WOODSTRIP
WASHER
ANGLE .
I RON RIB
~
c
o
c
(f)
~
47
FIG. 7-THE THREE HORIZONTAL RIBS are supported on blocks while the three main vert ical mem-
ber s are atta ched t o t he framework.
FIG. 8-MARK ALL FIVE VERTICAL STRIPS every eight inches to make install ing the hor izontal strips
eas ier.
en
U
Z
o
a:
b
w
-.J
W
6
o

a:
48
Putti ng it a ll together
The next step is to assemble the red-
wood lattice as shown in Fig. 4.Mark all
five vertical strips every eight inches
(Fig. 8) for ease in pos itioning and in-
stalling the horizontal strips . Start at the
ce nte r and work outwa rd- it' s a good
idea to displace the first mark half the
widt h of a horizon tal st rip so that you
ca n line up the edge of each 3/ 4 x 2 with
one of the marks. All 19 hori zont al strips
are spaced on 8-inch centers except for
FIG. 9-ADJUSTMENT BOLTS are set for proper
spacing between vertical frame rib and wood
strip. Here a 7Yo-inch spacer aids adjustment at
72-inch point.
The following are available from McCul-
lough Satellite Systems, POBox 57, High-
way 62-East, Salem, AR 72576: The 12-
foot 8-Ball Satellite Television Antenna
Kit , $750.00. Includes everything except
staples and concrete for mounting base.
Frame is 1
1l2
x 1V2-inch angle iron with ail
pieces cut to fit and drilled. One coat of
primer applied. All 5/ax2 and 5/a x3 red-
wood strips. Aluminum screen is 0.011-
inch diameter wire in a V16-inch mesh.
Add $60.00 for heavy-duty mesh, $50.00
for extra bracing and $100.00 for galva-
nized frame.
The heavy mesh (0.025 inch diameter
wire, Va-inch mesh) is about 2V2times as
heavy as the regular mesh and will with-
stand abuse by hall , Ice, etc. much better
than the regular mesh. The extra bracing
is necessary If you plan to move the an-
tenna about. It makes the framework very
rigid.
The 12-foot 8-Ball with galvanized
frame, heavy mesh and extra bracing is a
commerclal-grade 'antenna named " Octa-
sphere" and Is available for $1195.00.
Feed horn (fi ts LNA with WR-229 input):
Sheet metal with brass flange, $40.00;
Aluminum $60.00. RG-213 cable (loss 25
dB/100 feet at 4 GHz), $0.50 per foot. FM-8
cable (loss 13 dB/100 feet at 4 gHz), $0.60
per foot. Avantek 120 LNA (50 dB gain)
$690.00 inclUding DC block; $650.00 with-
out DC block. All prices are FOB, Salem,
AR.
t he very top and bottom strips. Those
will be about 3/ 4-inch close r in.
Now attach the adj ustment bolt s to
the 3/ 4 x 3-inch vertical wood strips (ex-
cept for the adj ustment bolt s at the ends
of the two outermos t strips) using the
bolt lengths shown in Fig. 5. Not e that
the 8- and 12-inch bolt s are actually
cont inued 0 /1 page 78
GARY McCLELLAN
case. they can be special-ordered,
although, since there are two different
manufacturers for these parts, finding
them may not be as difficult as you
think.
Finally, a few words about calibra-
tion. Forget about conventional signal-
generator alignment procedures. This
unit can be aligned using only the built-
in error indicator, and a receiver that
can pick up one of the WWV trans-
output is rich in harmonics, allowing
frequency coverage into higher parts of
the spectrum.
Four thumbwheel switches allow you
to set the exact frequency you want
with ease; there's no squinting at a
tightly packed dial. The switches make
it easy to return to a specific frequency,
and that makes alignment of equipment
a lot easier!
Another important feature is a 50-
ohm RF output. This low-impedance
output allows you to use such acces -
sories as attenuators, which are a must
for low-level RF work. You can't use
attenuators on conventional RF signal
,.,.,p,11
< r..p.p,M
The Programma-2 synthe-
sized RF generator can be built
for about $100, yet offers many of the same
features found on commercial units costing over $3000.
THERE SEEMS TO BE A CRYING NEED FOR
a good, low-cost RF signal generator on
the average workbench. However. it
appears that this is something that no
manufacturer has realized yet. For the
most part, you have to make do with an
under-$IOORF generator that is usually
kit-built and quite drifty. To compound
the problem, the dial accuracy usually
leaves something to be desired, and an
external frequency counter must be
used for calibration whenever high pre-
cision is required. The answer is to
buy-s-or most often to lease-a fre-
quency synthesizer when you need a
high-performance RF signal-source.
But since prices start at about $3200,
owning one usually isn't too practical!
Enter the Programma-2 RF generator.
Now, for less than 1/32 of the cost ofa
commercial model, you can build an RF
......
<0
0:>
......
generator with many commercial fea-
tures. You get crystal-controlled ac-
curacy at any frequency you select-
typically 0.0005%, short term. What
that means is that if you set the unit for
30.01 MHz, the output is 30.010,000 Hz
150 Hz!
Since the unit is crystal controlled
and incorporates a frequency synthe-
sizer, any frequency you select will be
locked tightly. The prototype drifts less
than 10Hz from a cold start-in an hour
of operation. After that, any drift that
occurs is negligible.
As far as features are concerned, this
project covers a basic frequency range
of 3 to 30 MHz in 10-kHz steps. Flip a
switch and you get 300 kHz to 3 MHz in
I-kHz steps. Thus, this RF generator
covers the frequencies most often used
for IF/RF alignment, and for general
experimentation. In addition, its RF
generators, and that makes some tests
(like checking sensitivity) very difficult.
Other features include adjustable RF
output, switchable AM/CW operation,
and an error indicator.
Construction isn't too difficult,
despite the device ' s many features. The
electronics are on three PC boards.
RCA-type connectors are used to
simplify interconnecting the boards and
to make adjustments or servicing easier
in the future . The boards are all single-
sided (most synthesizers require double-
sided boards to keep system noise
down) and can be easily made (or pur-
chased-see Parts List).
All components used in this project
have been on the market for at least
three years, so you should have few
problems in obtaining them. The tuning
diodes (D201-D203 on the VCO board)
may be.difficult to locate. If that is the
mitters. A frequency counter is helpful,
but not necessary.
About the circuit
Let's get acquainted with the Pro-
gramma-2 RF generator by taking a
look at the circuitry. The boards con-
tain a number of different circuits, and
the time spent discussing them should
payoff. It's hard to build an advanced
project like this without knowing much
about it. One thing though: you should
have a basic knowledge of how fre-
quency synthesizers work to appreciate
this discussion. If you have followed
my previous articles on synthesizer-type
projects (see the June 1980, July 1980.
and October 1980 issues of Radio-Elec- 8
tronies) you should have no problems. C
This device is built on three PC
boards-VCO. control, and switch (see
Fig. I). The VCO (Voltage-Controlled
49
VCO POWER-
SWITCHING
LINES
FIG. 1-RF SIGNAL GENERATOR consists of three main sections: control board, veo, and switch
decoder.
the tuning diodes used to set the fre-
quency. It is prohibitively expensi ve
today to make a single VCO sweep the
entire range; 3 VCO's simplify things
and keep the cost down. Following the
VCO's, there is a simple divide-by-IO
circuit that reduces the VCO frequencies
to values needed by the control board.
(Also, the output from the divider pro-
vides IF range frequencies , extending
the range of this instrument down to
300 KHz)
The RF-output range is selected by
the HI-LO switch. From that point, the
RF signal goes through an amplitude-
modulation circuit, which can add a
500-Hz tone to the signal if desired . The
RF is amplified by a single-stage ampli-
fier and goes to the RF-OUTPUT connec-
tor. The remaining circuitry on this
board is a simple 5-volt and 15-volt
power suppl y; the 5-volts is for on-
board circuitry, while the 15-volts is for
the control board.
The control board is an extension of
the VCO board. It receives the divided-
down signal from the VCO board, and
divides it again by 2. This supplies a
signal that the programmable divider
can handle easily ; such devices trade
off speed for programmability. The pro-
grammable divider divides the input
FREQUENCY
SET --
SWITCH ES L..,-...J-,....L_.L.-..J
SWITCH
BOARD
Oscillator) board contains the RF-gen-
erating circuitry, a divider , an ampli-
tude -modulation circuit , an RF power-
amplifier and a power supply. That
sounds like quite a bit, but actually
each circuit block is very simple. The
whole thing uses seven Ie's and I
transistor.
Next comes the control board, which
contains a -;.- 2 divider , a programmable
divider , a crystal-controlled reference,
a pha se detector, loop filter, amplifier,
and sinewave converter. All that cir-
cuitry is compre ssed into six IC' s and I
tran sistor. Isn't IC technology wonder-
ful? It would normally take a big card
cage full of boards loaded with discrete
components to replace just those small
boards!
The last board is the switch board
that cont ains a decoder and switches
power to the proper VCO circuit , de-
pending 'upon frequency.
Let' s discuss each board in general
z and then cover the control board speci-
a? fically. The other boards will be dis-
I- cussed in greater detail later.
&l As you can see from Fig. I, the VCO
uJ board contains the RF-generating cir-
e cuitry. Three separate VCO's are re-
o quired to cover a frequenc y range of 3
to 30 MHz because of the limitations of
50
______ +12VAC
RFOUT
MOOULATION
500-Hz
SINEWAVE
PARTS LIST
CONTROL BOARD
All resistors Y4 watt, 5%, unless other-
wise noted
R101-R115, R123, R124, R131-100,OOO
ohms
R116, R11 9-10,OOO ohms'
R117-2200 ohms
R118-47 ohms'
R120-150 ohms'
R121-1 megohm
ohms
R125, R126--33,000 ohms
R127-100 ohms
R128--5,000 ohms, tr immer potenti-
ometer, horizontal PC-mount
Capacitors
C1 ceramic disc
C102, C103, C114, 50
volts, Mylar '
C104-22 16 volts, tantalum'
C105-100 electrolytic, 16 volts
volts , ceramic
disc
C109-100 pF, ceramic disc
C110-220 6.3 volts, electrolytic
C111-5-35 pF trimmer (E.F. Johnson
275-0430-005 or equivalent)
C112-39 pF, mica
C113-68 pF, mica
C116--0.001 50 volts, Mylar
Semiconductors
IC101-GD4013 dual D f lip-f lop with
set/reset
IC102-GD4059 programmable divide-
by-n counter
IC103-GD4046 phase- locked loop
IC104-78L05 f ive-vol t, 100 rnA, regu-
lator
IC105-GD4060 14-stage rippled
counter
IC106-GA3130AE op amp (RCA)
Q101-2N3906 PNP
Q102-MPS-A13 Darlington, NPN
D101-1N5229 4.3-volt, 500 mW, Zener
diode
XTAL101-2.048 MHz, 32 pF parallel -
mode , 0.005%, HC-33/U case
51-54-BCD t humbwheel switch (C&K
332110000 or equivalent)
J101-8 pin IC socket
Miscellaneous: PC board, IC sockets,
4-conductor ribbon cabl e, wire,
solder, etc.
*00 not substitute
A complete set of three boards for the
Programma-1 is avail able for $22.00
ppd. from: Technico Services, PO Box
20HC, Orangehurst, Fullerton, CA
92633. CA ,residents please add 6%
tax; foreign orders please add $3.00
for shipping. Order No. SSG1.
A complete set of parts, excluding
boards, crystal, transformer and case,
is available for $112.00 ppd. from: Cir-
cuit Specialists, Inc., PO Box 3047,
Scottsdale, AZ85281. Order No. KT-5.
Phone orders (800) 528-1417; all other
inquiries (602) 966-0764. AZresidents
please add tax.
Crystal (see Parts List) may be ob-
tained from: JAN Crystals, 2400 Crys-
tal Dr., Ft. Myers, FL 33906. (813) 936-
2397.
TO FREOUENCY SETSWITCHES
r--------.J!\\....--- --- ......
S2 S3 S4
a be d ab ed abed
COM
"
R109-

TO J202 Rl 03 - Rl08, <
>R115
2N390: E
(VCOBO)
R131 ( ALL
(ALLlOOK) lOOK)
C Rl17
TO
R101
....
R1l6
2.2K
ERROR
l OOK "::' 10 9 18 17 16 15 2221 2019 3 4 5 6
-=
10K LAMP
[215
(LED 301)
Cl 0l 14
1
R1l8 Rl19

4
IC10l
f
;-!.
[Cl02
E.

I
4m 10K
C04059
IC103
CD4013 CD4046
j13
!l Cl 01
6 7 8 9 10 11 16
1!
14
Cl02 0.1 ]
Rl02

13 14 24
0.1 I Cl04 [ +
lOOK 22116V

-= -= -=
TO [C206/1C207 Cl09
(VC0 8D)
Cl05
;: 100
P
F .. I IC104 0
+
i1 78LD5 Cl08
100/16VJ
3 7
Cl06 C 1
0
.'
500Hz
ICI06 1 6

CA3130AE (1E
IN5229 .r; 01 I
R1 29 pV
4
8
.
10K
ZENER -= -=-=
XTALl Ol

R130
_ _
2.2K
R1 27
R12 1 Cl13 lOOn
1 ME G 68 pF
cno r
TO J201

R123
220/6.3V-=+
(VCO BO)
Cl l l lOOK

[1 530 pF 10
C114
R1 22 R125
Cl12 I
[Cl05
h
0.1
68K 33K 33K B
\1
39 pF CD4060
I
,II 0102
1
'I Mf'S.A13
r
16
R124 Cl 16
CAL -= J:
lOOK
0.001 I E
TO 02121
m1BL06

-= C1l 5
s - 2V
500-Hz SINE WAVE
213/214
0.1
R128 TO
(VCO80) o I
\I
5K
S5
" C
FIG. 2-HEART OF THE CONTROL BOARD is a programmable divider, IC102, used to determine the
signal generator's output frequency from the switch settings.
frequency by whatever divisor has
been set by the frequency switches,
and outputs the resul ting signal to the
phase detector.
Meanwhile , a crystal-controlled clock
circuit generates a 500-Hz signal that
drives the phase detector. The detector
compares the two signals and outputs
error information to the filter , which re-
moves any trace of 500-Hz signal. The
DC volt age from the filter is fed to the
amplifier, which raises it to levels suit-
able to drive the VCO' s. Thus, the syn-
thesizer loop is completed, and can gen-
erate RF signals set by the frequency
switches. The remaining circuitry is a
square-to-sine-wave converter. All it
doe s is convert the 500-Hz clock-circuit
pulses into a 500-Hz sinewave that
drives the amplitude modulator, giving
a clean-sounding tone .
The switch board is another exten-
sion of the VCO board. It selects the
one of the three VCO circuits that
matches the FREQUENC Y-SET switch
position s. For example, when fre-
quencies bet ween 03.00 and 05.00 are
set on the switches, the 3-5 MHz VCO
circu it is selected. Selecti on of the
appropriate VCO is done by decoding
the switch postions with a simple
CMOS decoder on this board. The
appropriate VCO is selected by switch-
ing power to it.
Control board theory
Let' s discuss the first board to be
built. Refer to the control board
schematics, Figs. 2 and 3, for details as
you read about it. The board uses
CMOS Ie' s throughout . This type of
design is used not only to keep power
consumption down, but to minimize
noise as well. CMOS logic tends to be a
lot less noisy than TIL and the RF
signal is clea ner. Besides that, CMOS
blocks like the CD4059 programmable
divider are far eas ier to work with than
their TIL counterparts !
The circuit is quite straightforward .
The divided-down RF signal is fed to
the board' s DIYinput and drives IClOl, a
CD4013 divide-by-2 flip-flop. The in-
put circuitry, ClOl and RlOl /RI02, is
interesting-it acts as a level-trans-
lating interface. The signal at the DIY
input is TIL level (0- or 5-volts) and all
logic levels on the control board are o-
ar 9-volts. Those components bias the
CMOS flip-flop to the point where a
TIL signal will drive it. The divided
output from the flip-flop drives ICI02, a
CD4059 programmable divider. It
divides the input signal by a frequency
determined by the settings of the FRE-
QUENCY-SET switches, and output s the
result.
Right now, that IC is one of the sim-
plest and most effective (read "fool-
proof") ways of making a program-
able divider. The out put drives ICI03, a
CD4046 phase detector. The IC com-
pares the signal from the divider with a
500-Hz refere nce , and outputs correc-
tion pulses to a loop filter that smooths
them into a DC voltage. That' s the job
of CI02-CI04 and RI18-RI20. The
phase detector also has an output that
goes low when the two inputs are un-
equal. That drives transistor QIOI and
lights the ERROR lamp on the front
>
c
(j)
c

<0
ex>

51
SI S2

a b abc d
,
.----
10 9 18 17 16 15

1/
2
Jl0l
7
IC102
CD4059

(TOSWITCH
6
BOARD)
f
5
13
1
14 24
+9V
FIG. 3-PARTIAL SCHEMATIC of the control board, showing connections to J101 (to which the switch
board connects).
YCO board where it can be used to am-
plitude-modulate the RF signal, if de-
sired . Rounding up the circuitry on this
board is a simple 9-volt regulator that
uses ICI04, a 78L05 5-volt device. Since
9-volts is required, DlOl , an IN5229
4.3-volt Zener, is inserted in series with
the regulator to raise the voltage to the
correct value.
Construction
The control board foil pattern is
shown in Fig. 4. (A complete set of all
three PC boards is available for those
who do not wish to make their own.
See Parts List.) Do not attempt to use
point-to-point wiring techniques-the
result will be a noisy RF signal.
A few tips on the qual ity of parts you
use should be mentioned. When it
1..-
FIG. 4-FOIL PATIERN for the control board. Prepared boards are available-see Parts List.
FRONT PANEL of the completed Programma-2 synthesiZed RF generator. Its layout gives t he unit a
professional appearance. .
. - . __.-.----- - ---------- - - .
XTALIOI to produce a 2.048-MHz sig-
nal. The signal is divided down to 500
Hz by a set of binary dividers . The 500-
Hz output serves as the phase-detector
reference, as outlined earlier, and gen-
erates clock pulses for the square-to-
sine-wave converter.
Capacitor Cl14 and resistor R122 in-
tegrate the squarewave into a rough tri-
angle wave that is then filtered into a
smooth sinewave by the QlO2 cir-
cuitry. The output, which appears at
the MOD terminals, goes back to the
panel. The user can easily tell if the in-
strument is putting out the right fre-
quency or not.
The loop filter's output drives IC106,
a CA3130 op-amp. That device is used
to increase the voltage from the loop fil-
ter so that it can drive the tuning diodes
on the YCO board. It's just a nonin-
verting amplifier with a gain of 2.2.
The 5OO-Hz reference signal is gen-
erated by IClO5, a CD4060 oscillator/
divider circuit. That IC has a Pierce
crystal-oscillator that works with
comes to substitutions, this project will
tolerate some departure from the values
called out. However, it isn' t a good
idea to make substitutions for the parts
marked with an asterisk in the Parts
List. Most of those components are in
the loop filter, and deviations in value
or quality will affect performance. Be
sure you use Mylar capacitors where
specified (those green capacitors .often
found in transistor radios). Also be sure
to use tantal urns where called for; other
types may be too leaky and that will
make the RF signal noisy. Be sure to
get top quality parts and the instrument
should give excellent performance and
long life.
You may want to order the 2.048-
MHz crystal right away. Generally,
such crystals are made to order, and it
takes about a month to get them. Give
the supp lier the specifications for
XTALIOl, and you should have one
shortly. Price? About $5.00.
Next month, we'll finish building the
Programma-2's control board and show
you how to connect the unit's front
pane l FREQUENCY-SET switches to the
board. R-E
09 80
SOOHM
RF OUTPUT
Off
l EVEl
.,
.,
Rf GENERATOR
-------- -

------_.
RANGE' 300KH2 30MHZ
SET
PROGRAMMA JI
"
+
TfCHNICO
FR!O G EUOR
AM HI
CW to
MOOULA TlON RANGE
(/)
o
z
o
a::
o
UJ
....J
UJ
6
Ci
-c
a::
52
FRED BLECHMAN and
DAVID McDONALD
It's said that " music hath charms to soothe
the savage beast." Build this musical horn for your
car and find out whether that's true during rush hour.
THE FIRST AUTOMOBILES. TRAVELING AT
t he breathtaking speed of 15 miles per
hour, used warning horns operated by
squeezing a large rubber bulb to force air
through an orifice. As the car evolved so
did the hom, going t hrough the "aah-
oog-aah" mechanical contraption to
the standard e1ectronically-operated-
diaphragm hom that has been in use for
years. Now you can move into the space
age by building your own electronic
mus ical hom for under $35.
The Musical Hom is designed for 12-
volt vehicles and uses digital integrated
circuits and programmable read-only
memories (PROM 's) to generate virtu-
ally any desired tune, depending on the
PROM's installed. Pre-programmed
PROM's are available for several tunes
(see parts list) . The popular " La
Cucaracha" is described in detai l here .
How it works
You don ' t have to under stand how
the Mus ical Hom works to use it. The
disc uss ion that follows is expressed in
lay terms for the electronics-oriented
non-musician, to describe how the digi-
tal circuitry creates the musical notes.
Music is composed of sound of speci-
fica lly related frequencies (notes) that
are sustained for part icular durations
(beats). Consequent ly, if we can gener-
ate those frequencies in proper relation-
ship to each other, and provide a means
to control thei r duration, we can make
music!
The musi cal scale
There are several different musical
scales (tone-series with specific fre-
quency relationships) in use throughout
the world. In the United States, the
standard scale is the Equally Tempered
Chromatic Scale, using the American
St andard pitch of A=440 Hz. By defini-
tion, the frequency of each note is ex-
act ly 2
1
hz(two-raised-to-the-Unth-pow-
er or 1.0594631) times the preceding
note . This is most easi ly shown on a
piano keyboard, a sec tion of which is
illustrat ed in Fig. I wit h the frequency
of each key. The circled numbers are
reference number s for use later.
Our challenge is to generate electron-
ically a range of spec ifically related fre-
quenci es. Obviously, separate oscil-
lat ors could be used- a very expen sive
and complicated approach. Or , we
could have a single master oscillator and
provide numerous "taps"- using re-
sistors or capac itors- to generat e eac h
not e. That approach is used in many
inexpensive toy electronic organs.
We're goi ng to do it digitally, though...
and without a keyboard .
The approach used here is shown in
block-diagra m form in Fig. 2. Twelve-
volt car -battery power is regulated to
supply 5-volt s to all Ie' s. A variable
low-speed clock triggers an 8-bit up-
co unter that is initially set to zero when
power is applied. The counter's binary
output sequentially addresses a 256-10-
ca tion " song" PROM. Each location
contai ns a 4-bit binary code that defines
which of 16 possible notes should be
generated at that moment.
The 4-bit binary code that appear s on :>
the output of this PROM is the ' " note 8
co mmand" code, and is directed to one C
set of inputs of a dat a comparat or. ~
Meanwhile, a variable high-speed clock <0
stro bes another 8-bit up-counter whose S'
53
How it works
Figure 4 is the schematic of the hom.
A 555 astable multivibrator, ICI, with
CJ. C2. RJ. R2. and R3, generates
pulses at pin 3. Their frequency is de-
termined by the setting of RI, the TUNE-
SPEED control. It takes 256 pulses for an
entire tune. and you can control how
fast the complete tune plays by setting
RI -from very slow (27 seconds) to
very fast (2.3 seconds).
Two 7493's . IC4 and IC5, are cas-
caded to form an 8-bit counter. The
pulses from ICI clock IC4, a divide-by-
16 binary counter. The Q0. QJ. Q2
and Q3 outputs go to IC8 to address the
least-significant four bits. A0. AI, A2.
and A3. of the 8-bit input. The Q3output
of IC4 (every 16th pulse) also clocks
ICS. another divide-by-16 counter.
whose Q0. QJ. Q2 and Q3 outputs form
the most -significant four bits-A4, AS,
A6. A7-to complete the addressing to
IC8. Wherever power is applied (switch
S I held closed) IC2 puts out a momen-
tary logic-high 'pulse at output Q, which
resets both IC4 and IC5 to zero. Now
each clock pulse from Q of ICI causes
the address to IC8 to advance by one
location, from zero to 255. The outputs
ofIC8. data lines 00. OJ. 02 and 03. are
inputs to data comparator ICIO at A0.
AI . A2 and A3.
The song program
Looking back at Figure I, notice that
most keys have a circled number indi-
cated. as well as a frequency. The cir-
cled number is a decimal number from I
to 15 to represent that particular note.
Zero is no note-that is, silence. Not all
the keys are numbered, since the 4-bit
binary code used in programming these
numbers only allows for0 -15indecimal.
The number 5, for example, repre-
sents middle C (261.63Hz). Now look at
Fig. 3, the actual programming of IC8
for" La Cucaracha". Start at the lower
left comer. The first horizontal row is
memory address 0. Each row shows four
vertical columns. Each column has a
decimal value , going from left to right, of
8.4, 2, and I. You may recognize this as
a binary sequence, or a 4-bit binary
code. A black dot in a column signifies a
speed 8-bit counter and resets it to zero.
The second section of the flip-flop
changes the pulse to a square wave at
one-half of the pulse frequency. The
square wave is then amplified and fed
to a speaker. The transistor amplifier
is operated directly from the 12-volt
supply.
What all this amounts to is that the
low-speed clock and song PROM deter-
mine the specific notes and duration.
while the high-speed clock and tone
PROM generate each desired note by
counting the number of cycles to reach
an addressed memory location. This
will become clearer as we go through the
circuit in detail.
C
240 244 248 252 255
o
rected to the other set of data-com-
parator inputs.
When the two data comparator inputs
correspond exactly. the comparator
outputs a pulse to a flip-flop used as a
delay element and wave-shaper. The
output of the delay portion of the flip-
flop passes the pulse back to the high-
196 200 192
CIl
~

"" ...
-1
CIl
!--1 COUNT
."

(TYPICAL) C"")
m
CIl
4 12 16 24 28 32 36 44 48 52 56
64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 127
C C S- S- A- A- G-
8
128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 191
4
2 ..'.
I./' G-
G- G- S- O G- G- G- S 0
FIG. 1- 11'. OCTAVES on a plano-style keyboard. Circled numbers refer to values contained In the
tone-generation program.
binary output sequentially addresses a
"tone" PROM with 256 locations. Cer-
tain specific addresses in this PROM
contain a 4-bit code that corresponds to
one of 15 possible tones, or a space (no
tone). At these specific note locations.
the 4-bit code for the desired note ap-
pears at the PROM's output. and is di-
FIG. 2-HEART OF THE MUSICAL HORN is the data comparator, which determines when, and for how
long, each tone will sound.
en
o
Z
o
a:
I-
o
W
...J
W
6
o

a:
54
02
2NJOl
02
lN400J
o [C12
LMJ09
+J..CS Ic
:t 10/lF -:1-
Bl
12V SI
BATTERY ..:I..

01
01 2NJ904

);Sl N40c:
vee..l- J 0 "::'
2 4 ICl l-b 9
14 J 0 12 5 CL 1/2
1 ICll-. 10 749J_
CL 1/2 - _ K 0
..1- K 749J 0 Vee 1
1
Vee J;l "::' "::'
J
5
1
R7
"::'10K
ICJ
555
S
2
C5
.
01
1
RS
lOon
PITCH
"te
R1 Vee
l OOK Vee t
R2 t [315
1
10K[418 14 b1 II
_ r-- CL IC4 00 9 ee
tT 2 t 16
ICl RS 5 AO
' 6 555 5 OJ 6 Al _DO -'-12"-----_ _ ---,
t2 1 J!O 7 A2
Cl * .,.. 1. 11 C2 "::'
l /lF I -L I .01 V, J ;;
v: .r, II I
R4 2 RS749J 02 9
lOOK 8
6 OJ"::' 1 14 11 9
IC2 11 J
2 555 5 Vee -rrAJ A2 Al AO
1 C4 2 IC10 6
J .01 14 Vf
J
'
lC6 01 ee
2 RS749J02 W 11S
OJ1lh5
AO
l!0 11 S Al wOO 12
R5 Vee "::' 7 A2 i3 11
4 AJ en cOl

J
4 8 B A4 :::!02'-'.10=-------'
J 5 2 A5
r-=AS '" OJ..;;. 9_ --- .....
" CL 1e7 I r AJ
749J 02 9 La N J14
2 RS 8
OJ 11 "::'
-=11,0
FIG. 4-MUSICAL HORN SCHEMATlC. Transistor 02, a 2N301, Is a special gennanlum type-do not
attempt to use a silicon-type In Its place.
PARTS LIST
Resistors %-watt, 5% unless
otherwise specified , I
R1-100,OOO ohms, potentiometer
R2, R7-10,000 ohms
R3-1000 ohms
R4-100,OOO ohms .
R5-500 ohms, potentiometer
R6, R9-100 ohms
R8-330ohms
R10-see Table 1

C1-1 /IF, electrolytic
C2, C4, C5--o.01 I1F, ceramic disc
C3--o.1 I1F, ceramic disc
C6-10 I1F, electrolytic
Semiconductors
ICl-IC3-555 timer
IC4-IC7-7493 4-bit binary counter
IC8, IC9-N825129 or equivalent 256 x 4-
bit PROM (see below)
IC10-7485 4-bit magnitude comparator
IC11-7473 dual JK master/slave flip-flop
IC12-LM309K, LM340K or 7805K 5-volt
regulator
Q1-2N3904 or similar
Q2-2N301
01,02-1 N4003, 200 PIV
51-N.D. momentary pushbutton switch
Miscellaneous: PC board, 8-ohm speaker
or horn, IC sockets, hardware, etc.
NOTE: The following are available from
PPG Electronics, Dept. RE, 14663 Lanark
St., Van Nuys, CA 91402: Complete kit
including PC board and all parts except
case and IC8 (No. 1082), $39.95; PC board
only (No. 782), $11.95; IC9 tone PROM
(PPG-O), $6.95; IC8 song PROM ("Cuca-
racha": PPG-1, "Dixie": PPG-2, "Charge": .
PPG-3), $6.95 each; 2N301 output tran-
sistor, $1.99. Add $2.00 shipping & han-
dling for orders within U.S. CA residents
please add 6% tax.
"I" or logic-high output; a blank indi-
cates a "0" or logic-low output. The,
"I " ..column corresponds to data line D0
of IC8; the "2" column controls data
line DI- "4" controls D2 and "8" de-
tennine's the output at D3. Putting ali
that together, the black dots for each
row (memory address) ofIC8 determine
the logic states of the four data-output
lines. When IC4 and IC5 input an ad-
dress to IC8, what they do in effect is to
look at the contents of that address and
set the output data lines to the corre-
sponding logic levels.
Confused? Well, another sketch (Fig.
5) and some examples will help. The
.musical notation shown in Fig. 5 is non-
conventional in some respects, but
more easily understood by non-musical
readers. A "solid" note with a stem is I
beat, which occupies four memory ad-
dresses in the song IC (IC8). An
"empty" note with a stem is 2 beats ,
and needs 8 memory addresses _ The
legend shows the other symbols and the
number or beats associated with them.
Each note is shown conventionally on
the staff; C is shown one line below the
staff, for example. The numbers above
the staff represent beats--a total of 64
for the entire tune . (64 beats times 4 >
addresses per beat equals the total of a5
256 addresses in IC8).
Looking at Fig. 3 again, we see that -l
address 0 (binary 00000000 from IC4 CD
and IC5) contains a black dot in only the
55
4 BEATS 0. 5SEATS
FIG. 5-SIMPLIFIEDSCORE for "La Cucaracha." rectangles represent "rests"---9llrlods
when no music is played.
d.
LEGEND; I
-' BEAT
d 2 BEATS d 3 BEATS

instead is the command for a different

note, then IC6 and IC7 keep counting
upward. Decimal address 94 contains
the binary code 1110 (decimal 14),which
would be the next lower frequency mus-
ical note, " A# ," in Fig. 1.
We'll finish discussing how the Musi-
cal Hom generates tones when we con-
clude this article next month. We'll also
give you some pointers that will help
make building and troubleshooting the
circuit much easier. After all that's
done , we'll show you how to mount the
Musical Hom in your car . R-E
-
12 16 211 24 28 32 36 411 44 48 52 56 611 63
-rtF.
4
54 55 56 57 58 59 60 61 62 63 64

BEAT- 50 51 52 53
BEAT _
1 3 4 6 8 10 11 12 13 14 15 16 17
G:: IT&
LfH-J.
J.
j=ip.
c 0 _
A B==
BEAT - 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
-

1
0.
BEAT - 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
inputs . Only when the "A" and "B"
inputs of ICIO are identical does ICIO
generate a logic-high output at pin 6. As
IC6 and IC7 address the memory loca-
tions oflC9, most locations are "blank"
(all zeros) . Finally, at decimal address
89 the binary number 1011 appears
(decimal 11 or musical note " B" in Fig.
1). This is, at that moment, the " B" input
to IC10. If the"A" input also has this
same input (011) then pin6 ofIC10goes
high, and IC6 and IC7 are reset to zero
by a pulse from pin 12 of ICII-a. If,
however, the "A" input is not 1011, but
8
64 68 72 76 811 84 88 92 96 l11ll 184 1118 112 116 1211 124 127
4
2
1
B A# A G F# F

@
128 132 136 1411 144 148 152 156 1611 164 168 172 176 1811 184 188 191
8
4
.


2
1 E 0 C# C B
; A#
(])
CD CD
192 196 28ll 284 2118 212 216 2211 224 228 232 236 2411 244 248 252 255
8
4
2
1
A G F
CD CD CD
FIG. 6-TONE GENERATOR program. Start reading at upper left. The lower the number assigned to
note, the lower Its frequency (see text).
"2" column . This means that the 4-bit
binary code for 2 (0010) will appear at
the output data lines ofIC8. The number
"2" corresponds here to the note "G"
(below' 'C' ') in Fig. 1and is also the first
note shown in Fig. 5, with a duration of 1
beat. Remember, 1beat takes 4 memory
locations in the song chip. However, the
end of each note is cut off one-quarter
beat short to signify the end of that note,
so only address locations 0, 1, and 2 are
programmed with a "2". Location 3 is
blank-silence. Locations 4, 5, and 6
and then 8, 9, and 10also hold a "2" in
memory. This means that, so far, three
distinct "G" notes have been com-
manded, each with a single beat dura-
tion (beats 1, 2 and 3), just as shown in
Fig. 5.
The next note we want is a "C" for
beats 4, 5, and 6. That begins at IC8
memory address 12 (binary input from
IC4 of 1100and from IC5 of0000). Here,
black dots are in columns 4 and 1, for a
binary output from IC8 of0101, decimal
"5." This corresponds to "c" in Fig. 1.
The note duration continues through
IC8 address 22, followed by a zero at
address 23 to cut off the note after 3
beats. Addresses 24 through 30 play the
note "E" (decimal "7" in Fig. 1) for
2 beats as shown by the Fig. 5 score.
"Rests," such as beats 18 thru 21, are
simply blank memory locations for that
duration.
The tune program continues through
address 255and then starts again at 0.
Tone generation
So far , IC8 has defined the note and
duration commands, but how do the
notes actually get generated? Refer back
to the schematic (Fig. 3).
Another 555, IC3, with capacitor C5
and resistors RS, R6, and R7, generates
pulses at pin 3 at a frequency deter-
mined by the setting of PITCH potenti-
ometer RS. Those pulses are from500to
1000 times faster than the tune-speed
pulses from IC1. The IC3 pulses clock
binary counter IC6, which cause IC6
and IC7-another pair of7493's-to up-
count in the same manner as described
earlier for IC4 and IC5. The 4-bit binary
outputs of IC6 (least-significant bits)
and IC7 (most-significant bits) form an
8-bit address word for IC9, another 256
x 4 PROM. That PROM is specially
programmed to generate tones. Figure 6
shows the memory locations for each '
note in IC9. Here's how a tone is
generated:
As IC6 and IC7 count upwards at the
frequency generated by IC3, the output
of IC9 at each count is that contained by
the memory location addressed at that
instant. That output is fed from data
lines 1:>0, DI, D2, and D3 to the B0, Bt ,
B2, and B3 inputs of ICI0, a 7485 data
comparator. Remember that the binary
output of IC8 at that point is beingfed to
the "A" inputs ofICtO, which is looking
for an exact match at its "A" and "B"
(J)
a
Z
o
0:
.....
a
w
...J
W
6
is

0:
56
. gramming technique, parit y is set by the
software, rather than the UART, al-
though most UART' s are capable of
performing this function themselves.
We have included a test in the receive
dat a-path to eliminate the nulls often
sent as line-feed delays. That is a pe-
culiarit y necessary for the correct opera-
tion of our own telet ype simulator. If
you need that, you may also find that
you need to expand it to test for and
ignore other such characters, notably
the ASCII " DEL" (7F hex).
In order to make the emulator as
transparent to the user as possible , it
retains control until the ASCII character
" ESC" (IS hex) is typed . If you don't
have that character on your keyboard,
you will need to select a replacement.
Choose it carefully . You want to avoid
conflicts with other special-meaning
characters, not only those used by your
system, but also those used by the
"answer" station. :
The package is really just a collection
of short subroutines to be called by your
command interpreter. That means that
the exact command syntax is deter-
mined by the command syntax you now
use . You must avoid conflicts among
the new commands and your existing
command vocabulary .
Each command routine begins by
pushing the command interpreter' s
start ing address onto the stack . That al-
lows a RETURN statement to send con-
trol back to the interpreter. Figure 18
shows a simplified flowchart of the
typical interpreter to help you in under-
standing and identifying the routine in-
volved . In that illustration, parameters
are not par sed and assigned values until
needed by the " action" rout ine.
The emulator shown in Fig. 17 may be
broken down into five units. The main
loop has only four steps. It polls first the
keyboard and then the serial-input port .
If dat a is available at either source, an
appropriate service path (either RX
DATA LOOP or TX DATA LOOP) is
invoked. Those two paths are the two
large st unit s in the routine. Finally there
is a short exit path and an initialization-
entry pat h.
In adapting those routines to your ma-
chine, the first step is to study the hard-
ware . Get your manuals, find the data
shee ts on your UART and baud-rate
generator Ie' s. and study the I/O driv-
er s in your computer's software.
In investigating the baud-rate gener-
at or you must det ermine if it has a con-
trol register and. if so, how to select
the appropriate mode of operation. You
must learn the address of the control
regi ste r and determine whether the
baud -rat e generat or requires any initiali-
zation or clearing procedure.
You must ident ify the address of the
baud-rate generator's data register.
Most of tho se data register s will accept
two bytes of data that mayor may not be
TWO
STOP
BITS
CALL
TTY
CALL
SEROUT
PARITY
EVEN
STORE
ZERO
IN" PFLAG"
The terminal-emulator program sup-
plied in assembly language in Table 2
should run on most 8080 and Z80 sys-
tems (ours uses an 8080). The program
ass umes that certain subroutines, or
their equi valents, are included in your
computer' s monit or. Those subroutines
ar e de scribed in Table 3.
To eliminate some machine-depen-
dence, and to illustrate a useful pro-
PARITY
000
STORE
0FFH
IN "PFLAG"
SET
BAUO
RATE
STORE
IN
" RCHAR"
GET
NEXT
PARAMETER
INITIALIZATION& ENTRYPATH
COPY"SPEEO"
TOBRGEN,
" FORMAT" TO
UART
FIG. 17- A MAIN POLLING LOOP, a TX data loop, and an RXdata loop comprise the terminal emulator.
The comman d "TE" invokes the emulator.
FIG. 16-EIGHT OF THE NINE two-letter commands used In the termi nal emulator select the options.
of the echo may also be controllable, if
not locall y. then by issuing a command
to the "answer" station. Most users will
prefer to run at 300 baud all the time.
which usually implies sending only one
stop bit. Finally, we have never encoun-
tered an install at ion using odd parit y.
Thus you may want to set those options
in the emu lator permanently and imple-
ment onl y TE.
en
S:2
z
o
a:
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--l
UJ
6
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a:
58
* INITIALIZATION OFTHE UART AND BAUD RATE GENERATOR
* ARE PERFORMED HERE. CONTROL TRANSFERRED TO TX
I
I * LOOP SO THAT RECOGNITION CHARACTER MAY BE SENT
* BEFORE MAIN POLLING LOOP IS ENTERED.
*
II *
:J>
c
o
c

i
i
I
l
!
:
I
I
LOAD ONE STOP BIT
FORMAT WORD
SET ECHO FLAG NON-ZERO
ZERO ECHO FLAG
ZERO PARITY FLAG
SET PARITY FLAG NON-
ZERO
GET VALUE OF DIVISOR
FROM INPUT BUFFER
GET THE CHARACTER
FROM INPUT BUFFER
YOU MAY NEED TO INSERT I
ASECONDTESTHERE IFYOU
TALK TO INSTALLATIONS '
WHICH USE DIFFERENT LINE I
FEED DELAY CHARACTERS I
IGNORE LINE FEED DELAYS
ECHORECEIVEDCHARACTER
CONTINU E POLLING LOOP
SKIP RX LOOP IF NO DATA
READY
t table CO il eludes Oil next page)
- --
A,CW1
A
EFLAG
A
PFLAG
A
A
EFLAG
A
PFLAG
A
A,L
RCHAR
NULL
B,A
EFLAG
A
A,B
NA5
TTY
SROUT
A
NA3
80H
B,A
PFLAG
A
AB
NA4
80H
MVI
XRA
STA
RET
XRA
CMP
STA
RET
CMP
STA
RET
XRA
STA
RET
XRA
CALL PARAM
SHLD SPEED
RET
CALL PARAM
MOV
STA
RET
JZ NA1
CALL TTY
JMP NA1
CALL SRSTS
JZ NA1
MOV
LOA
ORA
MOV
JZ
CAL L
CALL
ORA
JPE
XRI
MOV
LOA
ORA
MOV
JZ
XRI
*
S1
*
*
*
RE
LE
PO
*
*
SS
*
*
PE
*
* THE FOLLOWING ROUTINES IMPLEMENT THEOPTION
* SELECT COMMANDS
RC
*
*
*
*
*
NA2
*
*
*
* THIS IS THE RX DATA LOOP
*
RXLOOP CPI
*
*
* END OF TX LOOP. MORE MAIN POLLING LOOP.
*
NA5
NA4
NA3
NA2A
I
: READY I
* THE FOLLOWING PATH TRANSMITS A BYTE OF DATA FROM :
* THE KEYBOARD I
*
TXLOOP CPI ESC /
RZ / CHECK FOR TERMINATION I
REQUEST I
SET HARDWARE FLAGS
/
/ CREATE EVEN PARITY
SAVE DATA
GET SOFTWARE FLAG
SET HARDWARE FLAGS
RETRIEVE DATA
/
/ CHANGE TO ODD PARITY IF
DESIRED
SAVE DATA
GET SOFTWARE ECHO FLAG
SET HARDWARE FLAGS
RETRIEVE DATA
SKIP LOCAL ECHO
PERFORM LOCAL ECHO
SEND DATA
TABLE 2
SKIP TXLOOP IF NO DATA
SELECT BAUD RATE GENER-
ATOR MODE
(8253 ONLY)
/
/ GET LSB OF DIVISOR
WRITE TO BRG DATA
REGISTER
/
/ GET MSB OF DIVISOR
WRITE TO BRG DATA
REGISTER
/
/ SET UP UART
GET RECOGNITION
CHARACTER
TRANSMIT IT
STORAGE FOR CURRENTLY
SELECTED BAUD RATE
DIVISOR
SOFTWARE FLAG. ZERO INDI-
CATES REMOTE ECHO.
SOFTWARE FLAG. ZERO
SELECTS EVEN PARITY.
STORAGE FOR RECOGNITION
CHARACTER
STORAGE FOR SELECTED
CONTROL WORD
INSERT THE VALUE WHICH
SELECTS THE FOLLOWING
FORMAT WHEN WRITTEN TO
YOUR UART: 1 START BIT, 8
DATA BITS, NO PARITY, 1
STOP BIT,
SAME AS ABOVE EXCEPT
SELECTS 2 STOP BITS
THE SERIAL STATUS
REGISTER'S ADDRESS

CONTROL REGISTER
ADDRESS OF THE SERIAL
RECEIVED DATA REGISTER,
ALL SERIAL REGISTERS ARE
PROBABLY LOCATED INA
UART
INSERT ADDRESS OF YOUR
BAUD RATE GENERATOR 'S
CONTROL REGISTER
INSERT ADDRESS OF YOUR
BAUD RATE GENERATOR 'S
DATA REGISTER
MAY NOT BE NECESSARY.
WITH 8253 FOR BAUD RATE
GENERATOR, THIS VALUE
SELECTS DESIRED MODE OF
OPERATION
ASCII ESCAPE CHARACTER
LINE FEED DELAY
CHARACTER
FORMAT
SCONT
RCHAR
NA2A
A,BMODE
BCONT
H,SPEED
AM
BDATA
H
A,M
BDATA
2
1BH
o
xx
xx
xx
xx
xx
xx
xx
xx
CALL KYSTS
JZ NA2
JMP
LDA
OUT
LDA
OUT
LXI
MOV
OUT
MVI
INC
MOV
OUT
OS
OS
OS
OS
OS
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
--
* THESE TWO INSTRUCTIONS ALONG WITH THE TWO AT NA2
* CONSTITUTE THE MAIN POLLING LOOP
*
*
NA1
FORMAT
NEWACT
RCHAR
*
*
*
*
*
*
*
*
BDATA
*
*
BMODE
*
*
*
*
II
SPEED
II *
Iii,
II PFLAG
*
II *
II
II
I, *
I' * MEMORY ALLOCATION, DATA STRUCTURE DEFINITION
Ir- -
CW2
II *
I:
II
SIN
*
*
*
*
BCONT
I'
Il *
Ii * MANIFESTS USED THROUGHOUT THE PACKAGE
II *
II CW1
II *
*
59
TABLE 2 (cont i nued)
* 6850ACIA
*
LOAD TWO STOPBIT *
CONTROL WORD SRSTS IN
STA FORMAT
RET
S2 MVI A,CW2
*
STA FORMAT
RET
*
*
* THISISASAMPLE INPUT ROUTINE, USED WITH MY
*
ANL
RZ
IN
RET
STATUS
MASK
SIN
THEADDRESS OFTHE
STATUS REGISTER
SELECTDATA READY BIT
GETDATA
TABLE 3
SROUT-Local serial-output routine. This routine outputs the contents of the ac-
cumulator to the serial port . Contents of the accumulator are unchanged at exit.
and parameter parser. The command
table should be obvious because of its
list of ASCII commands. A few moni-
tors however, tokenize (translate into a
kind of shorthand) their commands be-
fore looking them up. In that case the
table is just more numbers. If you don't
have an assembly-language listing, your
user's manual-or a local computer
club-may be able to help you.
The command interpreter can be
found by following the program flow
from the start . It will be one of the first
routines encountered. A tipoff is that it
almost always ends with the mnemonic
PCHL.
To find the parameter parser, read
through the action routines of com-
mands that require an argument,
"DUMP nnnn" (where "1I11f111" is a
memory address), for example. If a ver-
sion of PARAM is not called in those
action routines, then suspect that all
parsing is done before the command is
invoked. Go back to the code that fills
the input buffer and trace its path . In
that approach, the arguments will be
valued and stored in fixed memory loca-
tions immediately after the input buffer
is filled. If you can spot the memory
locat ions, you can simply load the val-
ues you need directly from them instead
of calling PARAM.
(continued on page 77)
PARAM- This routine returns the value of the next command line parameter in the
HLregisters. Recognizes both hexadecimal numbers and ASCII literals.
TIV-This is the local output device driver. Inthis package itsimulates a teletype on a
CRT. Requirements are that it accept its input in the accumulator and that the data
remain in the accumulator at exit.
KYSTS-Local input routine. Checks the status of the keyboard. On "data ready"
condition, returns the data in the accumulator with the zero flag cleared. On "data
not ready", returns with zero-flag set.
SRSTS- Local serial-input routine . Checks the UART status register for a "data
ready " indication. Like the above routine, any received data is returned in the
accumulator with the zero-flag cleared. When there is no data ready, return is withthe
set.
COMMAND INTERPRETER- This routine collects lines of input of the form 'COM-
MAND parameter parameter....parameter.' It identifies the command portion and
compares it to a table of valid commands. Ifa match is found in the table, control is
transferred to a routine located at an address retrieved from the appropriate table
entry . Before the transfer of control, the command interpreter inserts its ownaddress
on the top of stack so that the selected action routine maybe exited witha normal
ret urn.
need t he correct addresses for the con-
trol register, the status register, the
"transmit data" register, and the "re-
ceive data" register. Note that there are
sometimes separate status words for the
transmit and rece ive status-registers.
Once you have collected that infor-
mation, you are ready to write some
"best guess" I/O drivers. Those are
SRSTS, KYSTS, SROUT in Table 3. I
suggest that unt il you are more familiar
with the workings of serial communica-
tions you try to ignore error-and parity-
checking. Don't get involved with them
unless they're absolutely necessary to
clear your UART.
When you have those routines written
(see the end of Table 2 for a sample), set
them up as an endless loop to test them.
That will allow you to view the TX
OATA output on a triggered scope.
Similarly, a function generator may be
used at the input to generate garbage to
check the receive function. If you get a
receive-indication constantly, even
without an input signal , you have prob-
ably guessed wrong about the active
state or position of the data-ready status
flag.
Having mastered the above, you are
ready to attempt to integrate the rou-
. tines into your software. Your first task
is to identify the command interpreter
REPORT
ERROR
FILL INPUT
BUFFER WITH
COMMANO LINE
FROM KEYBOARD
COMPARE COMMAND
PORTIDNWITH
CDMMANDTABLE
ENTRIES
PUSH " START"
ON TOSTACK
LOAD HLWITH
APPROPRIATE
ACTION ROUTINE
ENTRY ADDRESS
FIG. 18-PARAMETERS ARE NOT PARSED and
ass igned values until needed by t he "a ction
routine" in t his command interpreter.
written to the same address. You will
also need to know which byte (least-or
most-significant) should be written first.
Also, find out if any special control
word must be written to set up for the
data-write.
Finally, you must know the frequency
of the clock signal input to the baud-rate
generator. Your baud rate will be deter-
mined by dividing that frequency by the
number written to the baud-rate gene r-
ator's data register.
Study the UART's control register
until you understand how to select the
transmission format specified in the list-
ing in Table 2. You must know which bit
of the UART's status register reflects
" data ready" (and whether it is active
high or active low-we assume active
high in our routines). Again you will
60
C/J
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0:
f-
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UJ
-J
UJ
6
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0:
New frontier for experiments. Solid-state devices let you
explore the 1 GHz region and beyond.
JOSEPH J. CARR
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en
-I
METAL DOWEL
harmonic of the tank frequency.
A rectangular waveguide can also be
used as a tuned cavity if one end is
blocked off and the Gunn device is
placed at the one-eighth wavelength
point as shown in Fig. 9. The DC bias is
provided to the Gunn device through an
RF choke that is designed to block the
microwave RF.
The dimensions of the cavity are de-
tennined by the placement of a parti-
tion. Energy from the cavity is coupled
into the waveguide-transmission line
through an opening called an iris. The
size of that iris is a trade-off between
Jl
RFOUTPUT
X
2
FIG. 8-CUTAWAY VIEWof a coaxial cavity. The cavity Is hall a wavelength long and the base of the
Gunn device Is placed at the one-elghth-wavelength point.
cavity are coupled to the out side world
through a short coupling loop that is
situated parallel to the dowel center
conductor. The load impedance of the
Gunn device is set by the position of
the coupling loop, and is adjusted for
the best compromi se between the
stability of the operating frequency and
the maximum output power.
While simple, the coaxial cavity suf-
fers from a few basic problems. It is a
low-Q tank, and is sensitive to factors
such as temperature and load impedance
variations . The Gunn device in a coaxial
cavity may also tend to oscillate on a
TUNING
SCREW
Gunn oscillators
The Gunn device will oscillate in the
transit-time mode using only a simple
resistance for the load. The efficiency
in that mode, however, is only one- to
five-percent, so relatively large amounts
of DC power are required to generate
small amounts of RF power.
If we place the Gunn device inside a
resonant cavi ty, and bias the device for
the delayed transit-time mode, then we
will obtain better efficiency and some
flexibility of the operating frequency.
Figures 8 and 9 show two methods
for mounting a Gunn device inside a
resonant cavity. Figure 8 shows a
cutaway view of a coaxial cavity. The
cavit y is .one-half of a wavelength long,
while the base of the Gunn device is
placed at the one-eighth wavelength
point. A conductive " dowel" supports
the Gunn device and connects it to the
ends of the cavity; the dowel is also the
center conductor of the coaxial cavity.
A tuning screw is used to vary the
operating frequency of the device. It
effectively changes the dimensions of
the cavity. and can fine tune the operat-
ing frequenc y over a small range.
The oscillations on the inside of the
Part 2

vices to generate rrn-
crowave signals required solving some
complex problems. This month we'll
continue our look at the development of
those device s.
61
FIG. 9-RECTANGULAR WAVEGUIDEused as a tuned cavity. The DC bias Is provided to the Gunn
device through an RF choke designed for microwave use.
Va
+ -
..
-
RF

/TUNING
SCREW
]!::
-=-
r--'-- ::=::
<5
IRIS
-, --RF
GUNN

PARTITION-

-I
8
X
2
AVALANCHEZONE
L.----- --i 1----1 .... +'--- - - -'
FIG. 11- IMPATI DIODE structure. Electrons
generated In the avalanche zone will flow into
the drift zone of the n-reglon.
small electrical field will cause velocity
saturation of the electrons.
The electrons gene rated in the ava-
lanche zone of the IMPATT diode
shown in Fig. II will flow into the drift
zone of the n-region. It takes very little
added voltage to cause a large increase
in current in that mode .
Let' s consider a situation where an
IMPATT device is biased to a potential
ju st below Vz; i.e., in the reverse-bias
region but not quite to the avalanche
point. We must select such a bias that a
small added potential will throw the de-
vice into the avalanche region. Let us
further ass ume that the IMPATT de-
vice is operated in parallel with a high-
Q resonant tank circuit (i.e., the
IMPATT device is operated inside of a
resonant cavity). The reverse-biased
PN junction will create a noise signal
that shock-excites the tank circuit into
oscillation. The RF voltage produced
by the resonant tank is added to the
bias voltage, causing the diode to go
into the avalanche mode on positive
peaks of the cycle.
The number of electrons generated
by aval anche multiplicat ion is a func-
tion of the applied voltage (Fig. 12-a)
and the number of charge carriers
pre sent. Because of that dual de-
pendence, the avalanche current pulse
(Fig. 12-b) continues to increase even
after the RF voltage cycle has passed
its peak. During that process the charge
density at the avalanche point grows
exponentially while the avalanche
charge current (Fig. 12-c) drifts toward
the other end of the drift zone.
Does the IMPATT produce negative
resistance? Note that the current
reaches a peak (Fig. 12-c) as the sine-
wave RF voltage goes through its zero
cross ing point (Fig. 12-a); a 9O-degree
delay with respect to the voltage peak .
The criterion for negative resistance is
a phase difference of 90 degrees or
more bet ween the applied voltage and
the series current, so we may conclude
that the IMPATT is a negative-re-
sistance device .
The pulse current in the external tank
circuit (Fig. 12-d) is semi-square and
represents a current lag over appl ied
voltage of more than 90 degrees. Those
two factors are shown together in Fig.
nomena, so was given the acronym
IMPATT. It has now been recognized
that Read ' s structure is just one of
several that will result in IMPATT
operation.
Figure 10 shows the current-vs-volt-
age curve for a PN-junction diode . For
our present purposes we will consider
onl y operation in the reverse-bias re-
gion, i.e., the region in which V is less
than zero. There is a critical breakdown
voltage Vz in the reverse bias region. At
reverse potentials less than this value,
the current through the PN junction is a
very small leakage current. But the cur-
rent suddenly increases when the volt-
age exceeds Vz: the junction is operating
in avalanchevThe increased current is
due to secondary emission or avalanche
multiplication, inwhich electrons of the
leakage current have a high probability
of colliding with other electrons. The
result is a very rapid increase in reverse
current. In ordinary signal or rectifier
diodes, the avalanche phenomenon can
be destructive. Certain types of diodes,
however, are able to control the ava-
lanche process by using properly doped
semiconductor material. Zener diodes
and controlled avalanche rectifiers are
in that category.
Consider the IMPATT diode struc-
tue shown in Fig. II. The PN junction
of interest is on the left side of the
structure. Note that the right hand con-
tains an n-nr junction. The nt region
fomi s a contact of low resistivi ty for
the electrode , and prevent s metallic ion
migration (much as in the Gunn struc-
ture) into the active region.
The cent er region is made up of n-type
materi al and is the active zone. That
active region must be doped to the ex-
tent that it is fully depleted at break-
down. We want to insure that a very
+V
LEAKAGE
CURRENT
:Vz +
-V/
AVALANCHE
POINT
+1
AVALANCHE REVERSF FORWARO BIAS
REGION BIAS REGION REGION
- I
FIG. 10-THE CURRENT-VERSUS-VOLTAGE
curve for a PN junction diode. Note the high re-
verse current when the voltage exceeds the
avalanche point, V
z.
maximum output power and a sensi-
tivity to changes in the load and internal
impedance s of the Gunn device.
IMPATT devices
The IMPATT (IMPact Avalanche
Transit Time) diode was proposed in
1953 by W.T. Read of Bell Laboratori es.
Read ' s suggestion was that the phase
delay in a PN junction diode bet ween
an applied RF voltage and an avalanch-
ing curr ent could be used for negative
resistance operation at microwave fre-
quencies. In Read ' s model diode, car-
riers drifting thr ough a depletion region
cau se the negati ve resistance. Fabrica-
tion difficulti es prevented the const ruc-
tion of a working Read diode unt il the
mid-60' s. In 1965, however, R.J . John-
son of Bell Labs verified the validity of
Read ' s model when he generated ap-
proximatel y 80 milliwatt s of RF energy
at 12 GHz from a silicon PN junction
diode. Read' s diode depends upon im-
pact avalanche and transit-time phe-
(/)
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62

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OUTPUT INPUT
have onl y one port, so must be coupled
to a circulator to isolate input and out-
put ports of the amplifier as shown in
Fig. IS. That type of amplifier is called
a reflection amplifier.
TRAPATT diodes
IMPAIT diode s are generally limited
to operation at frequencies above 3 or 4
GHz. The problem of lower operating
frequencies is one of finding a method
for stretching the duration of the transit
time. Until 1967, it had proven difficult
to use solid-state device s to generate
any significant amount of power in the
I-GHz region . In 1967, however , engi-
neers working for RCA succeeded in
exciting an IMPAIT-like device into a
different mode of operation. One set of
trials produced pulse powers of 425
watts with an efficienc y of 25 percent.
Further work with that new mode
yielded efficiencies up to 60 percent,
with late r work producing efficiencies
as high as 75 percent. Tuned tank cir-
cuits developed at RCA in that era per-
mitted a tuning range that was con-
tinuous over 0.9 to 1.5 GHz.
It appeared that the problem of in-
creasing the transit time had been
solved, but no one really knew why! At
the time the basic work on the
TRAPAIT device was going on there
was no good theory that explained the
observed behavior. Workers at RCA
dubbed the new mode the anomalous
mode. perhaps reflecting the fact that
they had no theory of operation.
At least two different theories were
advanced to explain the behavior of the
anomalous mode . Bell Laboratories ad-
vanced the theory that the high ef-
ficiency and lowered frequency of
operation was explained by the fact .
that a trapped plasma was created in
the device between sweeps of the
IMPAIT mode of operation. The theory
held that the trapped plasma shielded
the charge carriers from the external
voltage field , causing them to drift out
of the plasma at low velocity. That
theory led to the acronym by which the
device is now known: TRAPAIT
(TRApped Plasma Avalanche Transit
Time).
Next month we' ll ' finish discussing
the TRAPIIT diode and show you how
it and the IMPAIT are related. We'll
conclude this three-part series with a
look at the BARIIT device . R-E
FIG. AMPUFIERS have iust one
port and must be coupled to a circulator.
IMPATT applications
The previous discussion has demon-
strated that the IMPAIT device will
function as an oscillator at microwave
frequencies . If an IMPAIT is placed in-
side of a high-Q resonant cavity, and
biased with a DC potential slightly be-
low the avalanche potential, then noise
pulses will ring the cavit y to produce
the RF sinewave that actually drives
the junction into the IMPAIT mode of
oscillation. IMPAIT operation occurs
because the voltage of the ringing
waveform (an RF s ignal) adds algebra-
ically with the DC bias, causing the
junction to go into the avalanche mode
on peaks of the RF cycle . If the device
is correctly biased, then, the junction
will be in the avalanche condition for
most of the positive half of the RF sine-
wave excursion.
Although the IMPAIT device is an
oscillator that is capable of producing
substantial peak-pulse powers at micro-
wave frequencies, it is not universally
applied because it is a noisy source
(avalanching is a noisy proce ss). For
that reason , one doe s not ordinarily see
IMPAIT' s as recei ver local oscillators .
IMPAIT' s are used primarily at fre-
quencies above 3 or 4 GHz, with fre-
quencies up to 100 GHz having been
obtained. Many high-power IMPAIT' s
require operating potentials between 75
and 150 volt s DC; a fact seen as a dis-
advantage by some. Also, IMPAIT' s
are usually ope rated from constant-cur-
rent power supplies, also a disadvantage.
The applications of the IMPAIT are
not limited to oscillator service. There
is one report of IMPAIT' s being used
as microwave frequency multipliers.
Many IMPAIT' s are used as amplifiers.
In fact , it has been claimed that most
IMPAIT applications are as amplifiers,
not as oscillators. IMPAIT 'amplifiers
energy, in the manner of a positive, or
ohmric, resistance, the IMPAIT offers
a negative resistance.
The IMPAIT device just described is
known as a single-drift device. But an
avalanching PN junction produces both
kinds of charge carriers; i.e., holes and
electrons. The single-drift IMPAIT
uses onl y the electrons, and returns the
holes to the cathode p-region. That fact
limits the efficiency of the single-drift
devices to less than 15 percent.
Greater efficiency is obtained through
the use of a doubl e-drift IMPAIT de-
vice , such as shown in Fig. 14. That is a
pt-p-n-nr structure in which the ava-
lanche region brackets the PN junction.
The p+ zone serves as an ohmic contact
for hole charge-carriers, while the nr
region serves the same purpose for
electrons. The output efficiency is in-
creased over that of the single-drift
variety because the holes drift across
the p-zone very nearly in phase with the
electrons drifting across the n-zone.
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FIG. 13--THE PULSE CURRENTIn the external
tank circuit is a sernl-squarewave and lags the
applied voltage by more than 90 degrees.
13. Two factors combine to cause the
positive external current during the
negative excursions of the RF wave-
form : the time delay of the avalanche
process and the drift time of the ava-
lanche charge. Instead of absorbing
FIG. 14-DOUBLEDRIFT IMPATTdevice. In this
device the avalanche region brackets the PH
junction.
d
FIG. 12-AVALAHCHECURRENTpulse (b) con-
tinues to Increase even after the RF voltage
cycle has reached its peak (8).
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10mV
25mV
50mV
75mV
100mV
SPECIFICATIONS
Frequency range: 25 MHz-650 MHz (710)
Input impedance: 50 ohms (nominal)
Input protection: diode-clamped, 5-volts maximum
Output signal level: TIL-compatible
Input sensitivity (typical): 25 MHz
150 MHz
250 MHz
450 MHz
600 MHz
Supply: 5 VDC, 50 to 75 mA
UHF Prescale.
for you.
Your old, slow, frequency counter isn't
obsolete. Build this inexpensive
prescaler and extend your counter's
range as high as 650 MHz.
YOU DON'T HAVE TO REPLACE YOUR
pre sent VHF counter-you can upgrade
it with the simple prescaler described
here for only $30.00. The circuit will
allow you to extend the useful range of
your frequency counter 10 times, to a
maximum frequ ency of 650 MHz. A 45-
MHz counter can now go up to 450MHz
and a 60-MHz counter will measure fre-
quencies up to 600 MHz. With an up-
dated UHF counter you will be able to
check synthesized TV receivers and 2-
met er amateur and commercial trans-
mitters, as well as marine and 450-MHz
communications equipment.
The small I x 2-inch PC board con-
tains a high-speed ECL (Emitter Cou-
pled Logic) prescaler IC and a single-
stage common-emitt er amplifier . Its
small size will allow it to fit inside most
frequency-counter cabinets. The circuit
requires 5-volt s DC at 50-75 rnA. The
pre scaler can also be installed in a sepa-
rate enclosure with its own power sup-
ply and used without any modification
being made to the counter.
Theory of operation
The prescaler circuit (Fig. I) works by
amplifying the input signal to a level
where it can be divided by the prescaler
Ie. The output signal from this IC will
be exactly one-tenth the frequen cy of
the input signal. There is no accuracy
specification. The prescaler always di-
vides exactly by 10. If the input signal is
450 MHz, then the prescale output-sig-
nal will be 45 MHz. Of course, the fre-
quency counter does not know that you
have prescaled the input signal so you
will have to make allowances for the
dec imal point being in the wrong place.
(The correct decimal-point position is
one place to the right.) It may be possi-
ble to modify the frequency counter by
using a two-pole switch that both ap-
plies power to the prescaler and shifts
the decimal point one place to the right.
The PC board has a ground plane on
the component side. Grounding is criti-
cal at UHF frequencies and this ground
plane provides a very short path to
ground. Any component lead going to
gro und is simply soldered to the ground
plane on that side of the board.
Construction
Foil patterns for both sides of the
board are provided in Figs. 2 and 3. and
a part s-placement diagram. as seen from
B the component (ground plane) side of
z the board is shown in Fig. 4. The posi-
o tive leads are marked by a dot or st ripe
g: on the bodies of tantalum capacitors C4
~ and C5 and they must be placed through
m the holes that are not part of the ground
6 plane on the component side of the
CS board. The negative leads of C4 and C5
~ get solde red to pads on the circuit side of
64
):-
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SIGNAL
OUT
14 13 12 11
PARTS LIST
Note: Need for items marked with "'" de-
pends on user's requ irements (see text ).
All resistors 5%, % watt
R1-10 ohms
R2-100 ohms
R3-470hms
R4-75 ohms
R5-2200hms
Capacitors
C1-C3, pF, monol ith ic
C4, C5-3.3. IIF, 25-volt , tantalum
Semiconductors
01 ,02-1N914
Q1-2N2857 high-frequency, NPN-type
IC1-650-MHz prescaler (Plessey SP 8680
or Fairchild 11C90)
S1' - OPOT switch
Miscellaneous: PC board, 16-pin Iesocket,
coax, BNC connectors' . solder, etc.
The following are available from Opto-
electronics, Inc., 5821 N.E. 142nd Ave., Ft.
Lauderdale, FL 33334, Tel. 800-3275912
(orders only), 305-771-2051:
Kit of all parts (PSL-650 Kit), $29.95
Double-sided PC board (PSL-650 Board),
$6.95
Counter probe (P-100), $13.95
Telescoping antenna w/right-angle BNC
connector (TA-100), $9.95
SP8680 or 11C90 IC, $16.95
2N2857 transistor, $2.95
Minimum order $15.00-if less, add $2.00
for special handling. Please include 5% of
total order for shipping, handling and in-
surance. COD $2.00 additional. Florida
residents please add 4% tax. Visa and
Mastercard accepted.
Rl
10n
C2
+ +
C5 Cl
820pF 3.3/25 820pF
-=
4 6
R2
C3
lOon
820pF
IC1
11C90!SP8680
01
lN914
R5
non
02
lN914
SIGNAL INl
C8
820pF
the prescaler PC-board ground plane
and to the ground lug of the counter's
RF-input connector.
Connection and use
The available space and internal lay-
out will determine the best way to mod-
ify the counter for the prescaler. Several
possible interfacing schemes are shown
in Figs. 5 through 8. It will be helpful for
you to have a schematic of your counter
so you can determine where the signal
exits its amplifier and enters the logic
and counting circuitry. A DPDT switch
can usually be mounted on the counter' s
front or rear panel and used to switch
the counter's input connector to the pre-
scaler's input, or a second
input connector (prefer-
ably a UG-I094/U BNC-
type with solder lug) can
be added.
Figure 5 shows the sim-
plest connection scheme,
requiring no modification
to the counter. The circuit
in Fig. 6 shows the addi-
tion of a DPDT switch to
permit the counter' s input
connector to be used by
either the counter or the
pre scaler. The one in Fig.
7 allows you to bypass the
counter's amplifier and
couple the prescaler ' s
output directly to the
counter's logic- and counting-circuitry.
The arrangement in Fig. 8 will work the
best . but requires the addition of a
switch and a second input connector
along with some knowledge of the
BILL OWEN

2N2857 PINOUT VIEW):

03 PIN 1 EMITIER
01 2 BASE .
0
4
. 3 COLLECTOR
4 CASE
FIG. 1-PRESCALER CIRCUIT Is not complicated. Not shown here are connectors and switch, since
those will vary according to needs of user.
the PC board as well as to the ground
plane. (Any component lead that inter-
sects the ground plane should be sol-
dered to it. ) There is a hole adjacent to
C3 and R2 where a piece of excess com-
ponent lead is to be placed and soldered
to both side s of the PC board. That feed-
through wire provides the ground for
pins 12, 13, and 14 of the prescaler Ie.
There is also a hole next to pin I of ICI
- that needs a similar feedthrough wire.
The 5-volt ground, input, and output
connections are shown along the lower
edge and side of the PC board in Fig. 4.
The signal input should be made through
coaxial cable such as RG-174/U. The
shield of the coax should be soldered to
Frequency
(ounler
65
,.
FIG. 2 (ABOVE)-BOnOM of t he double-sided
PC board. Many of the IC's pins are not con-
nected to anything .
+5V OUTPUT
(COAX)
1:
I ,
, ,
FIG. 5-OUTPUT of the presc aler can be connected directly t o input of counter.
r-- -, PRESCALER
OUTPUT
NOTES: - SOLDER ONBOTH SIDES OFBOARD
J - FEEOTHROUGH JUMPER THROUGH BOARD.
SOLDER BOTH SIDES
SOLDER SHIELD OF COAX TOGROUND PLANE
(COMPONENT SlOE OFBOARD)
+5V
counter' s circuitr y. The switched 5-
volts in Fig. 8 can be used to shift or
eliminate a decimal point , as well as to
conserve power when the prescaler is
not being used.
If you wish, the PC board can be
mounted inside the counter's cabinet
with double-sided foam tape.
The use of a 10- or 15-ohm resistor
(R I) in series with the prescaler's 5-volt
input reduce s power consumpti on, as
well as improving sensitivity.
Signals from signal generators, fre-
quency synthesizer s, and other type s of
osci llators can be direct-coupled
to t he pre scaler ' s input. Transmitters
must never be direct -coupled to the pre-
scaler input or damage may result from
overload.
A length ofRG-58/ U coax with a BNC
co nnec tor on one end and mini-alligator
clips on the ot her end can be used as a
dir ect- coupled probe. For measuring
transmitted RF frequ encies an antenna
ca n be att ached to the prescaler' s input
con nector. A stiff piece of wire can be
used , or a tele scoping antenna with a
built-in right angle BNC connector. By
using an antenna , transmitted RF pow-
er-leve ls from less than a watt to seve ral
thousand watt s can be handled easily,
without damaging the counter. R-E
FREUUENCY
COUNTER
COUNTERr-- -,
INPUT
~ \ ~ 0 ~ - ~ $
COAXIAL
CABLE
W/CONNECTORS
PRESCALER
W/POWER SUPPLY
PRESCALER INPUT
AG. 3 (BELOW}-GROUND PLANE on compo-
nent side keeps lead-lengths short, as required at
UHF frequencies.
FIG. 4 (RIGHT)-SHIELD OF COAXIAL CABLES
is soldered di rectly t o ground pl ane, as is " case"
lead of 2N2857 t ransistor.
FIG. 6-DPDT SWITCH directs signal either to
prescaler or to counter's amplifier input.
Sl b
TOCOUNTER
LOGIC/COUNTING
CIRCUI TRY
FIG. 8-PREFERRED SETUP uses two separate
input s. Swit ched 5-volts turns prescaler on and
off and can also be used to move decimal point
(see text ).
PRESCALE
Slb
- - - -- I
+5V I
I
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OUT I
I
I
I
I
PRESCALE
~ PRESCALE
COUNTER
AMPLIFIER
CIRCUITRY OUT DIRECT
TOCO UNTER
LOGIC/COUNTING --- ----'
CIRCUITRY
FIG. 7-USING THIS ARRANGEMENT, out put s
of prescaler and cou nter's ampli fier are applied
directl y to counter 's logic/ coun t ing ci rcuit s.
OUT
PR ESCALER
+5V
DIRECT
IN
PRESCALE
Sl 'a
TOCOUNTER
'---- AMPLIFIER INPUT
COUNTER
INPUT
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66
Digital Audio
using your VCR
LEONARD FELDMAN
CONTRIBUTING HI-FI EDITOR
,
Existing video-cassette recorders can be adapted for use in digital audio applications.
Here are some details of the EIAJ standard for home-use PCM encoders and decoders.
WHILE THE AUDIO INDUSTRY SEEMS
slated for a long-drawn-out debate as to
which type of disc format is best suited
for digital audio-reproduction (at least a
half dozen video/audio and audio-only
digital disc schemes have been pro-
posed and demonstrated successfully),
when it comes to storing audio informa-
tion in digital form on tape, there is at
least some stability.
Fortunately for the future of digital
audio, a group of Japanese manufac-
turers, all members of the EIAJ (Elec-
tronic Industry Association of Japan)
realized that unless they could agree on
standards for taping digital audio in-
formation, the new technology might
well go the way of quadriphonic sound.
where too many competing systems re-
sulted in public disenchantment. Ac-
cordingly, the EIAJ (whose member-
ship includes just about every manufac-
turer involved in digital audio and VCR
manufacturing) was able to come up
with a set of standards that they have
labelled ElAJ Technical File STC-007,
Home Use PCM Encoders and De-
coders. PCM, of course, stands for
Pul se Code Modulation and is just an-
other way of saying digital audio.
The PCM processor
For those unfamiliar with the way
that digital audio recording works. , a
brief review might be in order. A PCM
(or digital audio-processor) is an elec-
tronic component that converts an
analog (continuous) signal into a num-
ber-code consisting of millions of pulses
per second. Each number (or "word"),
expressed in binary form, represents a
sampled amplitude of the analog wave-
form. In that digitized form, the descrip-
tion of the waveform can be stored on
tape (or, for that matter, on discs), pro-
viding that the bandwidth-capability of
the storage medium is adequate. In
playback, the function of the PCM pro-
ces sor is reversed. The millions of
pulses, fed back to the processor as
they are read from the tape , are recon-
verted into an analog electrical signal
that is then fed to the usual stereo am-
plifier and speaker pair.
The ideal storage device for such
dense digital information is the home
VCR, first because it can handle band-
widths to beyond 3.5 MHz, and second,
because there are already many of those
product s in consumers' hands, with
more being bought every day. Those
familiar with how a VCR works, (and
familiar with the requirements of the
U.S.-type NTSC video signal), will ap-
preciate the difficulties that had to be
overcome to use a VCR as a tape-stor-
age device for digitally processed audio
information.
Since the VCR's recording format
was designed originally for video, that
means that if we are going to use a
standard VCR as a storage device for
digital audio recording, we have to fit
the millions of "bits" that constitute
the digital-audio code into the video
signal-format that is already part of
every VCR. That format includes hori-
zontal-sync pulses after every video
line, and vertical- sync pulses after
every video field. There are 30 inter-
leaved frames (60fields) per second and
525 horizontal lines per frame in the
NTSC TV-standard. That means that
you can't record those digital ' audio
"bits" onto the videotape in one con-
tinuous stream. The pulses have to be
added to the signal format during the
horizontal-line periods of the normal
video-picture format. Since there are
many ways that this can be done, it was
important that the industry get together
on a standard format for PCM/VCR in-
terface and use.
The standard set forth by the EIAJ
does not tell manufacturers how they
must build their PCM audio processors ,
or what features such products must
have . Rather, it describes the signal
that is to be recorded on the VCR's
:l>
C
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C
en
-i
67
ceeding words of the sampling code are
act ually separated by 16 horizontal
lines. That is, if the first 14-bit word of
the first line of a field is sample number
I of the left-channel audio amplitude,
then sample number 1 of right channel
audio amplitude will appear displaced
OATA
,...---------'!\\-- --- - ---"
OATASYNC
a
CONTROL
SIGNAL BLOCK OATA
EQUALIZING I B-' LOCK
PULSE r "\------ - ---" BLANK
__ nn 1 i
I=u!i I
I -;, 3 I 3 111 I
-I- )1- -II )1-
I-
II
I I
I 3 I 3 I 3.5 111
I
I
FIELO 2
I -I- -,- -II-
245
-I- 7-1
I
262.5
-I
b
FIELO 1
VSYNC _

l ! I I II I
I I II I
I 13 I 13 4 I 1
1
!41 5 !
It )It )101_
1+-260.l--'1)*I+.------1330.1 )1 I
168 -I
I
L R L R L R
I
CRC
I
I-
12BBITS
t
-I
/ \
P Q
ERROR ERROR
CORRECTION CO RRECTION
FIG. 4-OFTHE 262.5 lines in each video field, 245 are used for the storage of audio data. An additional
line is used for a control-signal block. Both fields of a video frame are shown.
L 14 + 14+ 14 +14+ 14+14+ 14+ 14 +- 16 J
J BITS BITS BITS BITS BITS BITS BITS BITS
CONTENTS IOENTIFICATION
\
sampled audio signals (interleaved as
L, R, L, R, etc. ), followed by two
words (known as P and Q codes) for
error correction, and a 16-bit CRC
(Cyclic Redundancy Check) word for
error dete ction. In order to take care of
possible long dropouts in the tape, sue-
FIG. 3-ALTHOUGH ONE LINE can hold 168 bits, only 133 are used. The remaining space is occupied
by standard video sync- and reference-signals.
FIG. 5-CONTROL-SIGNAL BLOCK uses one line and contains information required for processing the
aud io data.
FIG. 2-EACH HORIZONTAL LINE contains six audio words, two error-correction words (Pand 0) and a
siX1een-bit CRC word for error detection.
10.6K
15/IS --P
SIS
OCT.
-- ;;. I
IOCT.
-
I
I

0 ..
5 /IS
ASIS
I
tape cassette in sufficient detail so that
a recording made on one VCR would be
playable on another VCR, usinganother
PCM processor (providing, of course,
that the VCR format s were the same).
The EIAJ PCM standardized format
Two channel s are used in the new
standard (for stereo). Pre-emphasis
(with automaticall y sensed de-emphasis
during playback) for additional noise
reduction is optional. The noise-reduc-
tion system uses two time-constant s: 50
microsecond s and 15 microseconds, as
shown in Fig. I . The sampling frequency
(the rate at which the analog signal is
+1 0
+20
<Xl
l'
0
o
e,
'"
-10
-20
200 500 1K 2K 5K 10K 20K
FREQUENCY- Hz
FIG. 1-NOISE-REDUCTION SYSTEM uses two
time constants for pre-emphasis and automati-
cally sensed de-emphasts.
sampled for instantaneous "numerical"
amplitude) has been fixed at 44,056Hz.
That rather unusual number is more
than adequate for recording and repro-
ducing audio signals up to 20 kHz (the
sampling rate in digital audio must be at
least twice the highest frequency to be
recorded) and in addition, it bears a
mathematical relationship to the hori-
zontal TV line-rate .
The EIAJ system uses 14-bit linear
encoding. This means that the encoder
can assign anyone of 16,384 (2
13
+ 2)
values to each sampled amplitude ; and,
mathematically, that means that for home
PCM recorders and processors we can
expect a dynamic range of about 85 dB.
Some of the encoders already demon-
strated do not actually use 14-bit en-
coding but instead , for reasons of
economy, use 12-bit encoders with so-
called float ing-point converters that
give the equivalent of a 14-bit output. It
is the cost of this section of the PCM
processor that accounts for the very
high price of those products so far. We
can hope that when AID and DI A con-
verters are reduced to large-scale-in-
tegration IC' s and are produced in high
quantities we may begin to see lower
costs for those PCM proce ssors.
The tot al number of bits per second
z in the standard is 2.643 megabits. That
number was determined in part by the
..... need to have enough redundanc y for
&l error correction and horizontal blank-
u:J ing. As shown in Fig. 2, the contents of
6 one horizontal line of equivalent video-
format signal will consist of three
a: word s each from the left- and right-
68
BUILD YOUR OW" ROBOT!
>-
c
G)
c
(f)
..-i
(Zip) (State)
Please pr int
.. He should have known bett er than to
tangle with a solid-state computer."
MOBILITY BASE is not a lunar space
station. It is the drive system that permits
the robot to move from here to there. Full
construction detai ls along with a discus-
sion of power sources is included.
THE BODY-FRAME AND ROTATION
MECHANISM. This is the part that makes
Unicorn-1 look like a robot. Wood and
Formica are the mater ials for t he body.
Motors and gears are what make it func-
t ion.
.. COMMUNICATIONS. How you can tell
your robot what to do. Preprogramming
techniques....radio control....computer con-
trol are all detailed.
SENSORS. How to add sensors so your
robot doesn 't bump into t hings.
Send today for your 52-page (8Y2 x 11")
booklet containing complete reprints of
all eleven art icles in the Build Your Own
Robot series by Jim Gupton.
This all- inclusive reprint gives you all the
data you need to build your own Robot.
TELLS EVERYTHING YOU NEED TO
KNOW to build the Unicorn-1 Robot with-
out the need for an engineering degree or
special equipment. The robot is fully
mobile wit h manipulator arms to grasp, lift
and carry.
MANIPULATOR ARMS and end-effec-
tors (hands) are what enable the robot to
perform useful tasks. Details of const ruc-
tion techniques and considerations are
fully explored.
....E...... .
Robot Reprints
200 Park Ave. South
New York, N.Y. 10003
SPtClAlIW'fllllT
BUIlD TItlSIlO8IIT FOR IIIlERS400
Radill-
Elealr nia
small quantities of prototype produc-
tion previously offered by Sony and
others) is Sanyo, a relative newcomer
to the ultra-high-fidelity field. Their
unit , the PCM Plus 10, carries a sug-
gested retail price of $3995. To that, of
course, must be added the cost of a
video-cassette recorder. Those are not
exactly the kind of prices that will bring
hordes of anxious customers to dealers
who stock the PCM processor. But
technology has a way of moving quick-
ly, and future advances may well make
the PCM processor as affordable and
popular as the cassette recorder is
today. R-E
by one word space, but sixteen lines
lat er in the encoded sequence.
As shown in Fig. 3, each complete
horizontal line contains space for 168
bit s, but only 128 bits of data per line
are used. The remaining space is used
for the horizontal -sync pulse, data-sync
pulses, and various other signals that
are required by the VCRfor a standard
TV signal format.
The signal format for a single video
field (there are two fields per frame and
30 frames per second) contains 262.5
horizontal lines of data, as shown in
Fig. 4. (The first field of a frame is
shown in Fig. 4-a; the second in Fig.
4-b.) Of those available lines per field,
245 lines are used for digital-audio data
storage, while one horizontal line is
used for a control-signal block. The
control-signal block line is made up of
56 bits for indicating the start of the
data block in each field; 14bits for con-
tent identification; 28 bits for " address;"
14 bits for control, which includes a
copy-prohibiting code; identification
code s for the P and Q error-correction
words; and a pre-emphasi s-identifica-
tion code, and 16 bits for the cyclic re-
dundancy error-detection code. The
contents of this control line are illus-
trated in Fig. 5.
We have referred several times to
error-correction in discussing the new
EIAJ PCM standards. Error correction
is a vital part of any digital-information
storage system. Dropouts caused by a
tape' s coating-irregularities or by poor
contact with the tape head's surface
may be insignificant and inaudible
when they occur in a conventional
analog tape-playback system; but losing
even a couple of microseconds of data
in a digital system can significantly alter
the numeric code that is to be recon-
verted to an audio signal. For that rea-
son, the error-correction system in-
cluded in the EIAJ standard format is
highly sophi sticated. The error-correc-
tion system can be instructed to " fill
in" the amplitude of the previous word
in the number code , or the average of
the preceding and succeeding words, so
that, in case of any dropout s during
playback, a smooth continuit y of sound
is always maintained.
No one can predict how soon prices
for PCM processors will plunge low
enough to make it practical for many of
you to abandon your open-reel and cas-
sette decks in favor of this new record-
ing technique. In professional applica-
tions, many larger studios are already
utilizing digital recorders (most of
which use a 16-bit system for even
lower distortion and greater dynamic
range) for making and editing master
tapes from which records are ultimately
produced and pressed.
At the consumer level, the only man-
ufacturer to offer a PCM processor for
home use as of this writing (aside from
69
- - - -. - -
, ,h e;:,b b y
,-- --- --- ---- ---- -- -- - - - - . .
AG. 1
1.5 TO '9vDC.
Idiot box entry .
Don't forget that the idiot box "con-
test" is still running. The circuit shown
in Fig. 1 is a slight modification of one-
sent in by Claude Elder of Aliquippa,
PA. It is a little audio oscillator that is
simple to build, yet has three control s
for the panel to add interesting con-
fusion to the operation. .
Momentary switch S1turns the sound
on and off, and S2 controls the decay of
the sound. The potentiometer controls
the frequency (tone) of the sound. The
parts values are not critical.
Most of the do-nothing circuit entries
have involved sound in one way or an-
other. How about some more with
flashing lig.hts and/or moving meters?
tnterest lnq books
McGraw-Hill has added two very
useful books to its Electro Skills series.
One is for reference and the other is on
Cls repa.
A Reference Guide to Practical Elec-
tronics by Robert G. Krieger, Sr. con-
tains a thorough treatment of 100 of the
most commonly used electroni cs equa-
tions . The book covers subjects ranging
from Ohm's law to some quite sophisti-
cated topics . Each section follows this
format: statement of the equation , defi-
nition of equation terms, thorough ex-
planation, and examples of use.
This guide has information that should
be near your workbench. It can help
you through some of the tough ones.
How to Repair CB Radios by Law-
rence E. Shultz does a good job of telling
you how to do just what the title
promi ses . It covers diagnosing, trouble-
shooting, and servicing 23- and 40-
channel CB' s. Power supplies and an-
tennas are covered as well. Though this
book is about CB equipment, the tech-
niques explained and used are applicable
to all kinds of receivers and transmitters.
The se books should be available
through your local bookstore but if you
have a problem finding them, write
Gregg/McGraw Hill, 1221 Avenue of
the Americas, New York , NY 10020.
Ifhe wishes, HC can look back at the
Hobby Comer in the July 1979 issue of
Radio-Electronics to find a way to make
normal clock Ie' s run faster (or slower)
than normal. It is only a matte r of
feeding a different frequenc y into the
50/60-Hz input pin. Do any of you have
other ideas about a sidereal clock?
button, to display the time in another
zone.
Perhaps the simplest solution came
from David Lippincott of San Diego,
CA. He calls our attention to the fact
that Radio Shack has a complete LCD
clock module (catalog No. 277-1(07)
with the two-zone capabil ity.
Michael Kesti of Grass Valley, CA
and Phelps Ter Heun of Ridgecrest , CA
both wrote about a clock kit that meets
the requirements. Coincidentall y,
Michael says that his clock IC has
failed and the company is out of busi-
ness . He cannot find a replacement for
the house-numbered device . Phelps,
writing about the same kit, mentions
that the clock IC is really a Mostek
MK50362N.
Thanks to those mentioned above and
to the others who rallied to Larry ' s as-
sistance. That information should solve
his problem. In the meantime , I am
astonished that no one has come up
with a little circuit to put between a
clock IC and the readouts to add (or
'subtract) from the " hour" digits.
One clock leads to another
Speaking of clocks, H. C. Gernhart
of Princeton, WV is trying to avoid the
high cost of a sidereal clock. (It seems
that such a clock is of great advantage
to tho se interested in astronomy.)
Well , I have forgotten more astron-
omy than I ever knew. However, I do
seem to reqall that sidereal time runs
at a constant pace-s-it' s just a
little slower than our "real" time. A
sidereal day is 23 hours , 56 minutes and
4.09 seconds long, compared to our
"normal" 24-hour one.
4 .7K
05
1-__-jI- r- 811.
MOST OF US ARE VERY conscious OF
energy consumption these days, and
we have variou s reasons for that con-
cern. Some of us are concerned about
the limited amounts of energy 'available
to our civilization. Others worry about
how to pay their energy bills and thus
are interested in keeping consumption
as low as possible.
Whatever the specific reason, we do
want to keep our energy use down to a
minimum. To do that effectively, we
need some way of knowing just how
much energy we are using. We can still
read the electric meter and the dials on
the gasoline pump, but 'more informa-
tion is needed. Staying with electrical
energy for the time being, we need to
know just how much a given appliance
is using at a particular time, as well as
its total usage.
Two readers have been working on
different aspects of that problem. Frank
Posthuma of Snohomish, WA has hit
several snags in his attempt to design a
digital circuit to measure energy usage
from the AC line. Dale Glaser of Albany,
CA is not having much success in mea-
suring power used from a 12-volt bat-
tery backup system. ,
If you have figured out a way to
make those or similar measurements,
how about passing it along? Not only
would Frank and Dale be grateful but
the rest of us could put the methodes) to
good use, too.
Dual clock
You'll recall Larry NeeI' s request
for help in designing/building a dual
time-zone clock. He want s a clock to
keep local time and, with the push of a
Energy consumption measurements, some clocks, an idiot
box, and more. EARL " DOC" SAVAGE, K4SDS, HOBBY EDITOR
(f)

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If coupon Is missing, write:

Heath Company, Dept. 020802
Benton Harbor, MI49022
Send today!
It costs nothing to discover the com-
plete line of Heath electronic kits.
Don't miss it. Clipand mailthe coupon
now.
Discover the fun of kit
building: It's a great way to
relax in your spare time, resulting in
beautiful things you'll be proud to
have in your home. And it's easy.The
famous Heathkit illustrated manuals
make it easy for anyone to build
reliable craftsman-like kits.
400 electronic kits:
Stereo components, color lV's, com-
puters, test instruments, electronics
educational programs,amateur radio
gear - things you've alwayswanted,
now at low kit prices.
Heathkit
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Benton H8rbor, MI49022
I Send my free Heathkit Catalog now. I
I I am not cur rently receiving your cat alog. I
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NPN
(SEETEXT)
TRANSFORMER
ISEE jit }OUTffiT
Help Prevent
Birth Defects -
The Nation's
Number One
Child Health
Problem.
The 555 is wired as an oscillator that
t urns the transistor switch on and off.
The transistor is any power NPN-a
power-tab audio type works well. One
of the smaller variety such as the Radio
Shack No. 2008 can be used if you limit
the on-time to brief intervals to prevent
burning it out.
As the transis tor switches, current is
allowed to pulse thorugh the transfo rm-
er. The rapid building and collapsi ng of
the magnetic field places a much higher
voltage on the transformer output.
Finding a proper transformer may
cause a bit of a problem. What you need
is an audio -output type made for use
with tubes-the higher the turns ratio,
the better. If you can scrounge one out
of an old tube-type radio or TV, prob-
ably it will do quite well.
Notice that the transformer is wired
backwards , as it were. The circui t is
connected to the secondary (the side
that was connected to the speaker) . Of
course , that makes the high impedance
(former) primary side the output.
If you need a small source oflow-cur-
rent high-voltage pulses, this circuit
may be j ust the thing. Watch the on/off
button-the current drain of this thing
will eat up a battery in short order. R-E '
IMEG
4 8
680n
IMEG
555
6 3
2 5
.02
.01
'=
'::'
Fig. 2
A little shocker
The circuit shown in Fig. 2 is quite
int er esting. Closing moment ary switch
S I produces a " shocking" high voltage
on the transformer. The electronic prin-
ciples here are the same as found in cat-
tle prods and similar devices. Of course,
this one is a bit on the weak side.
+9V ..:I..
0-----<0 0-----,
S1
New catalog
If you have not seen the Fair Radio
Sales Company (P.O. Box 1105, Lima,
OH 45802) catalog, do yourself a favor
and get one. Fair handl es government
and commercial electronic surplus and
their catalog includes receivers, trans-
mitters, subassemblies, motors, meters,
test instruments, and part s.
Printed circuit know-how
Quite underst andably, there is a lot
of interest in making and using printed
circuit boards. Of course, many art icles
have appeared in Radio-Electronics
about PC work. We do make every ef-
fort to keep you informed about the
lat est development s. What so many of
yo u seem to need, however , is a source
of information about all the methods of
fab ricating boards.
Well, the Heath Company (Benton
Harbor, MI 49022) has come to the
rescue with their 1-3/34 Printed Cir-
cult Course . In addition to the 390-page
self-study manual , this program includes
all material s for making boards using a
wide variety of methods plus two useful
kit s that use the PC board s you make:
the model GD-600 photoe lectric light
switch and the model GD-/ 287 touch
control switch. When you finish the
course, you not onl y have the knowl-
edge you need , but you have two items
to use around the house or shop.
The course is well planned, and is
wri tten in clear, easy-to-understand
language. It covers the selection of ma-
terial and method , design, art work, PC-
board fabrication, and board assembly.
If you want to " put it all together" as
far as PC boards go, give consideration
to this course. I am sure Heath will be
glad to send you a catalog containing
information about it, and the many
other courses and kits they offer.
CIRCLE 8 ON FREE INFORMATION CARD 71
rJEJ"" ideas
Date
NEW IDEAS
Print Name
Signature
St reet
This column is devoted t o new ideas ,
cir cuits, devic e applications, construc-
tion t echniques, helpful hints , etc.
All published entri es, upon publica-
tion, will earn $25. In addit ion, Panavise
will donate their model 324 Electronic
Work Center, having a value of $49.95.
It combines their clr cult-board holder,
tray base mount , and solder stat ion (see
photo below). Selections will be made at
the sole discretion of the editorial ' staff
of Radio-Electronics.
Titl e of Idea
I agr ee t o the above terms, and grant
Radio-Electronics Magazine the right
to publish my idea and to subsequently
republish my idea in collecti ons or com-
pilations of reprints of similar articles. I
declare that the attached idea is my
own or iginal material and that its publi -
cation does not violate any other copy-
right. I also declare that this material
had not been previousl y published.
0.1
R3
10 k
I?ST
/ 1
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a potentiomet er to give you a 2.27-Hz
clock pul se. That clock pulse is applied
to the input of the 4020. a 14-bit binary
co unte r.
The different iat ing circuit (C3, R3)
reset s the counter when the device is
first turned on. After the 40%t h clock
pul se, pin 3 of the counter goes high
and stays high until the 8192nd clock
pul se . When that happens, pin 3 goes
low again.
Using a clock frequency of 2.27 Hz,
it will take about 30 minutes for pin 3 to
go high and about 30 more minutes for
it to go low again. The output of the
counter is applied to one input of the
401 J NAND gate. To get the timing for
the 30-minute "on" state, a logic
"high" (12 volt s) is applied to the other
input of the NAND gate, and the gate's
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-=- - 30MIN I L - PER
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15 'is' 15 I"j'51
PIN 2 .:..=...J I:> L.::::'-J
FOR IN CREASED
OU,PUT DR IV E.
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T O
PUMP
AS SUMMER TEMPERATURES GO UP. SO
does the use of electricit y. For those
who own swimming pools, a large part
of that increased electrical usage is
ca used by t he swi mming-pool pump .
Although most pumps are set up to run
conti nuously, that type of operation is
unnecessary in many cases .
The circuit (Fig. I) described here is
a poo l-pump timer , or controller, that
lets you run your pump for 15, 30, or 45
minutes out of an hour, rather than con-
tinuously. If you wish, the circuit can
be disabl ed and the pump run continu-
ously simply by turning the circuit' s
power switch to OFF.
The 555 timer IC is connected in the
astable mode . Its output is adj usted by
POOL-PUMP TIMER
Mail your idea along wit h t his coupon
to: New Ideas Radio-Electronics,
200 Par k Ave. South,
New York, NY 10003
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FIG. 1
FIG. 2
City State ZIP
output is connec ted through R4 to the
base of Q I.
To get the 15-minute "on" state, the
logic "high" is removed from the input
of the NA ND gate and the output from
pin 2 of the 4020 is connected in its
place . When that is done , the output of
the gate is high for 45 minute s and low
for 15 minutes. To get the 45-minute
"on" state, the output from the 15-
minute " on" state is simply inverted
using a second NA NDgate. Another pair
of NAND gates may be used in parallel
with the first if you find that more dri ve
is needed .
The transisto r switch, QI, saturates
when the input to its base is high. Whe n
t hat happ ens, current flows and en-
ergizes the relay. The pool pump is con-
nect ed to the relay's normally closed
co ntacts and is turned off when the re-
lay is energized.
Cons truc tion is straightforwa rd, and
any meth od ca n be used. Wire wra p
was used to build the protot ype. The
only import ant point to remember is
that the relay co ntacts must be capable
of handling the current drawn by the
pump. Any 12-volt power supply may
be used , but a regulated supply such as
t he one shown in Fig. 2 is advisab le.
Th at' s all there is to it. I'm sure that
you ' ll find , as I did, that this circuit will
make running your pool a lot less expen-
sive thi s summer. -Tim Landr eth
service
questions
VERTICAL PROBLEM
Fred Steurer, of Hami lton, OH, sends
along a hint on the vertical osci llator
time-constant problem we covered in
t he January 1981 issue of Radio- Elec-
tronics (Service Questions). He says
that this probl em ca n also be caused by
the vertical-hold control if it has leakage
to the case. Thank you!
BURNING RESISTOR
I've got a peculiar problem! This Magna-
vox T940 burns out T302, a 1000ohm, 3-
watt resistor (actually a thermistor) in
series with the vertlca/-output transformer
primary. There Is only a 28volt drop
across It, showing less than 1 watt dissi-
pation! A SD-JJF capacitor on the bottom
end of the primary (C107C) shows no
shorts or leakage. With a new resistor, the
vertical sweep is normal until the resistor
blows.-K.Y., Marysville, MI
You've proved that the overload
isn' t due to DC, so, there' s only one
possibility left-excess AC current!
There is a very high pulse present at the
top of the primary, and the big capacitor
is meant to get rid of it at the bott om
end. I don't think it is working.
Check the bottom of the primary
with an oscilloscope. If you see a high
pul se- voltage, replace that capacitor.
An easy way to check is to disconnect
the capacitor and tack in a new one for
testing. The cause of prob lem is a high
pulse-voltage flowing thro ugh resisto r
and grounding through good capacitors
in the B+!
TRANSFORMER SUBSTITUTION
In the December 1980 issue of Radio-
Electronics, I had a question abo ut re-
placing power transformers in audio
amplifiers. I sugges ted a 12-volt fila-
ment transformer. A reader in Canada
disagrees with that! He says that the
original transformers have a built-in
fuse ! (Mostly imports, I think-Editor)
If a stock transformer is used , the next
fault may cause the amp to burn up.
I'll agree wit h him, in principle. As I
should have mentioned before, when-
ever I replace a transformer like this
(with a built-in fuse) I add a fast -blow
fuse to the circuit! Thi s is easier than it
sounds. You can use a pigtai l fuse, with
insulating sleeve or, if there is no room,
cut the line cord and use an in-line fuse
holder like those used on many car
radios. Check the actual maximum load
curre nt and don't use a fuse rated at
more than abou t 120% of that current.
Fo r a 0.7-amp current. for example,
use a I-amp fuse . R-E
Let the Triplett Model 60 tester show you what a full-
featured VOM is all about. You get all the extras that
make any test ing j ob easier . . . you get a superi or
design that el imi nat es 90% of costly repairs due
to VOM misuses . . . you get a VOM that's:
1. X'TRA RUGGED-Will wit hstand an
acci dental dr op up to five foot heig ht.
2. OVERLOAD PROTECTED-All ranges
protected by diode and unusal thr ee fuse
arrangement, i ncl uding 1/8 amp, 1 amp
and 2 amp/ 1000V fuses.
3. SAFETY DESIGNED FOR YOU-
Designed to most rigid safety standards ;
compl etely i nsulated unit i ncluding
newl y desig ned saf ety leads.
For a demonstration, contact your Trip lett
Dist ributor, Mod Center or representati ve.
Tripl ett Corporation, Bl uffton, Ohio 45817.
(419) 358-5015, TWX (810) 490-2400.
Triplett performance.. .
. TR IP LET T
CIRCLE 68 ON FREE INFORMATION CARD
$
MODEL 60
NOW ONLY
CIRCLE 69
FOR IN-PLANT
DEMONSTRATION
newpre;,ducf:s

L!J
".
see
"
,oot
""
CIRCLE 141 ON FREE INFORMATION CARD
The model AM-4 features auto-zeroing on all
ranges except the very sensitive 0-20-ohms
range. On the 0-20 ohms range, it may be neces-
sary to use the ohm-zero adjust to zero the instru-
DIGITAL MULTIMETER, model AM-4, is a digital
multimeter with ranges and capab ilit ies for indus-
tria l use. The ranges are 0-1.999/19.99/199.9
vol ts AC/ DC pl us 0-1000 VAC, and 0- 1500 VDC
(15K VAC/DC can be added wit h an accessory
high-voltage probe); 0- 19.99/ 199.9 J.lA AC/DC, 0-
1.999/19.99/ 199.9 mA AC/DC, 0-10 amps AC/
DC (0-300/1000/ 6000 amps AC can be added
wit h accessory clamp-on current t ransducers); 0-
19.99/199.9 ohms, 0-1.999/19.99/199.9K ohms
plus a special diode test range; 0-199.9 mV AC/
DC. An AC leakage range (0-1.999 mA AC) for
checking 115/ 230 VAC appliances can be added
with an accessory leakage detector.
The accuracy specifications are: DC, 0.8% of
reading LSD; AC, 1.5% of reading LSD
based on 45-500 Hz sinusoidal waveform. (Accu-
racy on 0-20/200 J.lA ranges may be affected by
outside interference.) Resistance is 1% of read-
ing 2 LSD. Clamp-on, AC current transducers
add 'h% of reading ; 15K VAC/DC high-voltage
probe adds up to 2% of reading. The leakage
detect or meets and exceeds ANSI requirements.
the system f rom triggering false alarms during
daylight, or because of temperature changes
without movement. The model GO-3510, special-
ly packaged in easy-to-assemble kit form with a
step-by-step assembly manual, is pr iced at
$139.95-Heath Company, Benton Harbor, MI
49022.

CIRCLE 50 ON FREE INFORMATION CARD

HOME SECURITY-SYSTEM KIT, model GO-
3510 Security Light Control, uses a passive
infra-red sensor to detect changes in tempera-
t ure, when accompanied by motion, in a 25-by-
25-foo t range . When a war m-bodied object
moves t hrough the fi eld, lights and/or other
devices (up to the model GO-35 10's 500-Watt
capact iy) are turn ed on.
Sensitivit y-l evel may be preset manually to pre-
vent false trigger ing. Buil t- in safeguards prevent
TOTAL I _
r
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pase 0 Elect ron i c Test Equi pment Construct ion $4.50
o 1st Book of Hi Fi Loudspeaker Enc losures $3.25
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\)S\NG i('l 0 Practical Computer Exper iments $4.75
50 0 50 CMOS IC Pro jects $3.50
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ment. Size is 6 "I,. X 3
13
/ , . X 1 "I,.inches; weight
11 ounces. MTL all-weather test leads are sup-
plied.
The model AM-4 is priced at $129.85.-
Amprobe Instrument , 630 Merrick Road, Lyn-
brook, NY 11563.
BROADBAND VHF/UHF BEAM ANTENNA , the
Scanner Beam, is intended primarily for the hob-
by scanner and is designed to work over the con-
tinuous frequency range from 108 through 512
MHz. The antenna consists of a seven-element,
log-periodi c array with a gain approaching 8-dB
above a dipole on the high band and UHF. The
15-db front -to -back rati o makes the Scanner
Beam suitable for long-distance, weak-signal di -
rect ional reception; average VSWR is 1.92:1. On
low band (30-50 MHz), the antenna resembles an
omni-d irectional ver tical antenna.
The Scanner Beam is construct ed of heavy-
duty aluminum tubi ng, and featur es unbr eakabl e
Cycol ac insulato rs, a 4-foot baked-enamel
pai nted boom, and incl udes a 4:1 matching balun
transformer for either 50- or 75-ohm coaxial
feedline. A universal offset mount permits it to be
attache d t o a met al mast with a mini mum of inter-
acti on, and further allows the antenna to be tilt ed
in a verti cal pl ane for satellite recept ion. It is also
useful for trans mitti ng in t he 144, 220-and 420-
MHz bands.
CIRCLE 142 ON FREE INFORMATION CARD
The Scanner Beam is priced at $39.95, plus
$4.00 for shipp ing. A mat ching coaxial cable
assembly, 65 feet long, with factory -installed " F"
connecto r, Motorola connector, and weather
boot costs $14.95 plus $4.00 shippi ng.-Grove
Ente rp rises , Inc., Route 1, Box 156S, Brasstown,
NC 28902.
CASSETTE INTERFACE, the Fast/oad, is a de-
vice that inputs prerecorded pr ograms into TRS-
80 Model I, Level II computers at 16 times the
normal speed. Any cassette of up to C-20 in
length can be loaded at 8000 baud using a modi-
f ied CTR-41 recorder plus t he Fast/oad. For short
programs the Fast/oad is faster t han di sk and
~ ", ~
~ . " . -
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~
CIRCLE 143 ON FREE INFORMATI ON CARD
longer programs load in seconds rather than min-
utes. The unit is a small box that is placed under
the cassette recorder and plugs into either the
back of t he TRS-80 16K keyboard or the expan-
sion interface. The Fast/oad does not require
t ransferring all programs to another medium f irst.
A modified CTR-41 cassette t ape recorder must
be used with t he Fast/oad. The modifi cati on
allows both the PLAY and FAST FORWARD controls to
be latched down at the same t ime so t hat t he
head is in contact with t he tape at t he fast-
forward speed. To use t he Fast/oad, the user ini-
tializes wit h a system command after turn ing on
the TRS-BO; then the LOAD command can be
used. Price for the Fast/oad Cassette Interface is
$188.00; the modified CTR-41 recorder is
$95.00.-Personal Micro Computers, Inc., 475
Ellis St., Mountain View, CA 94043.
BASS ACTIVATOR/SUBSONIC FILTER, model
DF120 Bass Bomb, provides variable bass-fre-
quency selection of 40 Hz to 160 Hz with a 0 to
12-dB bass-boost level control while using a filter
to eliminate subsonic noise. Attached to the pre-
amp and amplifier, the subsonic filter automati-
cally protects speakers and amplifiers from un-
wanted voltage spikes and also minimizes sub-
sonic noise from turntable, tone arm, acoustic
feedback, and warped records. Other features
are elimination of distortion under 20 Hz, a slide
CIRCLE 144 ON FREE INFORMATION CARD
control for selecting the most desired frequency,
and the option to keep subsonic filter in-circuit
even when bass boost circuitry is turned off . Sug-
gested retail price is $99.95.-Numark Electron-
ics Corp., 503 Raritan Ctr. , Edison, NJ 08817.
PRECISION TWEEZERS, are battery-powered
lighted tweezers, with stain less steel blades . They
are powered by a single AAA battery, and the
lamp directs the light to the working area.
A low-cost plastic-case mode l is available that
is ideal for field tool cases, just what is needed for
worki ng in poorly-lighted field situations. Two
stainless-stee l case models are also available,
one with a straight tip, and one with an angle tip.
The steel cases will last many years on t he indus-
tr ial assembly bench.
CIRCLE 145 ON FREE INFORMATION CARD
The plastic -cased tweezers are priced at $5.68;
t he steel tweezers are $16.98.-De8co Indus-
t ries, Inc., 351 F Oak Place,Brea, CA 92521.
CB RADIOS, President models AR-711 and AR
144: The model AR 711 (shown), designed and
built to the specifications of truckers and other
cantinued on page 76
Troubleshoot
complex
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products fast
with
B&K-PRECISION
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If you've ever signal traced an analog
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The breakthrough is B&K-PRECISION's
SA-1010 signature analyzer.
Companies committed to cutt ing
service costs and reducing "board float "
are designing many products for signa- .
tureanalysis testing . Digital " signatures"
are documented in a service manual.
The technician compares this reference
data with signat ures observed with the
SA-1010 in the circuit under test. When
the signatures match, the circuit is
good... when they don't, the probl em is
isolated! No complex wavefor ms or logic
tables to analyze. The SA-1010does
all the work by converting digital data
into easy-to -compare four-digit hexa-
decimal displays.
The SA-1010is the top performer,
packed with features .. .
20MHz operating speed
.10/-Ls set-up time
Mullifamily .. .TTL, MaS and CMOS
Internal clock output
Signature " HOLD"
Unstable Signature " HOLD".
Signature analysis is here today.. .and
the SA-1010 is in stock for delivery.
For more information, or to order an
SA- 1010, call B&K-PRECISION t oll-free at
800-621-4627.
EIJl1JI1IJ1I!Jl
DYNASCAN
CORPORATION
6460 West Cort land Street
Chi cago. illi nois 60635 312/889-9087
IntI. SI s . , 646 0 W. Cortland si.. Chica go , IL 60635
Canad ian Sales ; au as El ectroni cs, Ontar io
CIRCLE 24 ON FREE INFORMATION CARD
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CIRCLE 147 ON FREE INFORMATION CARD
a high-frequency dome radiator, equipped with a
one-Inch copper voice coil and two-pound mag-
netic assembl y. Formed of light weight phenolic
material coated wi t h aluminum, the dome repro-
duces the hi ghest frequencies wi th sup erior
depth and clari ty, offering greater powe r- han-
dling capaci t y as wel l. It also feat ur es a new high-
resolution diViding networ k that provides the sys-
tem with improved t ransient response throughout
its range. The 12- inch low-frequency driver , in
combinati on with a passive radi ator , delivers
except ionally deep, dist ortion-free bass re-
spon se. There is a fi ve-inch mi dra nge that pro-
vides accurate, nat ur al sound at all levels.
The model L 150A's maxi mum recom men ded
amplifi er power is 300 watts-per -channel. The
nominal impedance Is 8 ohms. Crossover fre-
quen ci es are 1.1 kHz and 9.7 kHz, the syst em' s
sensitivity Is 89 dB sound-pressure level (1 watt/ 1
met er).
The model L 150A is priced at $695.00 eac h.-
James B. Lansing Sound, Inc ., 8500 Balboa Bou-
levard, Nort hridge, CA 91329 . R-E
CIRCLE 146 ON FREE INFORM ATION CARD
professional users, feat ures a noi se-cancelling
mi crophone with an extr a-long co il that extends
to 10 feet. There is also a 4-inch ext ernal speaker,
wit h mounting bracket and 5- foot cable; inst ant -
select channel-9 and channel 19 swit ches; auto-
motiv e prot ective knobs, and a HI-CUT tone switch.
Other features includ e MIKE GAIN, RF GAIN, ANl / NB,
S/RF meter, digita l chan nel indicator, TX and RX
indicators, positive/negative ground, automatic
modulation control , PA and external speaker
jacks . There Is also a pl ug-i n DC powe r cord.
The model AR 144 is a 40-c hannel AM/SSB
mobil e CB radio featuring NB/ANl , Channel-9 pri-
ority , bri te-dim, mode and PA-CB switches, plus
MIKE GAIN, RF GAIN, and CLARIFIER controls. Other
features include S/RF mete r, digital chann el indi-
cator, TXl RX mode and chan nel-9 indicators, auto -
matic modul ati on co ntrol, detachab le dynamic
mi cr ophone, pos itive/negative ground, PA and
external speaker jacks, and plug- in DC powe r
cord .
The model AR 7 11 has a suggested retail price
of $139.95; t he suggested pri ce for t he Model AR
144 is $219.95. Both models car ry a two -year full
warr anty.-American Radio Corporation, 6330
Cast leplace Drive, Indi anap oli s, IN 46250.
FLOOR-STANDING SPEAKER SYSTEM, model
L 150A, is a successor to t he model L 150, and has
NOW YOU
CAN BUILD
YOURSELF
AN
ORCHESTRA
Address _
City
WERSI ELECTRONICS, INC. Dept. M4
P. 0 , Bo x 5318, 172 0 Hempstead Road
Lancaster , PA 17601
Please send above d emo pack @ $6,00.
Name _
The most advanc ed - most versat il e organ
you aver dreamed of Is now w i t h i n most
everyone' s reach , . because you build i t
yourself the exclusive WERSI wa y.
Expand your instrument according to
your ta ste and budget, With WERSl's
'Building Block' sy st em, y o u' ll never
need to trade organs again I
Super io r WERSI quali tv also availab le in
pianos, synthesi zers , amps, rhythm un its ,
etc. , . kit or factory assembled ,
Send $6 for the exciting Sight and Sound
package everyone raves about. You'll
recei ve the f am ous " WERSI T I ME 2"
12" LP w i t h acc ompanyi ng li bret t o as well
as a full co lor , 104 page manual , wi del y
acclaimed as the encyclopedia of organ
builders , introduc i ng you t o the
Wonderf ul Wo r l d of
liinllll#t-'l#tl l eader quali ty
.;;;;1._- dO-It-yourself Instrumants
--- - - - - - - - - - - - - -
Vital protection
for PC Boards

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" " 2 0tn , , > J' .
r
Be safe. Desol der PC components
wit h Endeco irons. Get proper HEAT
TO MELT and stro ng VACUUM
ACTION TO LI FT sol der and cool
bot h PC board and component
wit hou t damage,
Th ese PC co mponents replaced fast
wi t h End eco deso lderi ng or solde r-
ing t ools.
Enterprise Development Corp.
5127 East 65th Str eet
Indi anapoli s, IN 46220
Phon e: (317) 251- 1231
CIRCLE 43 ON FREE INFORMATION CARD
Endeco pr of ession al features Include
safety li ght t hat denot es high, low
and off on switc h model s. SS co n-
structi on for lon g lif e, light weig ht
and balanc e for easy use.
Co ntact yo ur dist ributor for Endeco
deso lder ing and sold ering irons, kit s
and equipment- or write us tod ay,
MOU NTAI N WEST, Dept. RE-8
4215 N. 16th St., Phoenix, AZ. 85016
Please send me your FREE color pro duc t catalog .
Name _
Address _
City State Zip_ _
or call toll free 1-800-528-6169

CIRCLE 30 ON FREE INFORMATION CARD
EXP OATE
8ClB6 MICROPROCESSOR
TRAINI NG UNIT $29995
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76
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Nothing less than the best.
I(EITHLEY
Keithley Instrument s. Inc.
28775 Au rora Road /Cleveland . OH 44139
(216) 248-o400 /Telex: 98-5469

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Our new model 128 has a beeper and a whole lot more.
After you've seen it we think you'll agree that this is the
best all around field service DMM available. It beeps
on all three functions-V, 0 and A-and on all ranges
J
for each function. Applications are virtually
unlimited. It "displays" a standard digital readout,
an audible tone for rapid over/under checks and
n
over/ under arrow.
Unique 128 design enables you to
T e
verify forward conduction and reverse
d
blocking of semiconductor
junctions, test LEOs and check.
soun multiple junction components.
h
Even with the beeper on, the
128 maintains 10MOinput re-
e O
l1r le sistance. You can calibrate
1. both the beeper threshold
and the A/D without disassembling the instrument.
The 128 is human engineered
with a large, 0.6" display, rugged
ABS case and display Window,
350-hr battery life and overload
protection.
Much less versatility can cost
much more than $139.
The 128 is the sound choice
because it's the smart buy.
Contact your local Keithley rep-
resentative or distributor.
BUILD A MODEM
co ntinuedfront page 60
If all el se fails , you' ll have to write a
simple ver sion of PARAM just for this
package.
Once you have found the command
interpreter, you must determine if the
entries in the command table are offi xed
or of vari able length. Variable-length
entries are usually marked by setting the
most significant bit of the command' s
last character high. To make a short
command work in a table affi xed-length
commands , pad it with blanks. The end
of the table may be detected either by a
counter's reaching zero, in which case
an adjustment to the program will be
nece ssary, or by the inclusion of an
end -of-tab le marker.
To con struct the routine s in BASIC,
you must have commands available that
allow input and output to specific I/O
ports. An input command that "hangs
up " until data is ready will not work.
In BASIC, the indirect calls used in
the ass embly-language program are not
practical. Replace them with a multi-
way branch structure (ON-GOTO. tF-
THEN-GOTO. etc) . Each subroutine will
then have to end with " GOTO start" .
Once the software is written and
seems to run without " crashing, " you
are read y to try it with the hardware.
Connect the modem to the comput-
er's seri al port and apply power. Typical
RS-232 connections were shown in Part
2. in the July 1981 issue of Radio-
Electronics .
Your modem will emit a tone when-
ever it is on . Use your new program to
select the options compatible with the
installation you intend to commu nicate
with . Without calling anyone, enter the
emul ator program by typing the TE (or
your equivalent) command. The modem
should "bleep" immediately upon entry
to the emulator and with each key clo-
sure thereafter. You should also be able
to fill the screen or teletype with garbage
by whi stling near the ' modem' s micro-
phone.
If everything appears to work, exit
the emul ator program and if you in-
stalled a separate power switch, tum off
the modem. (The switch makes it easier
to establi sh a connection with cert ain
time-sharing operations.) Double-check
all options, including the channel-select
switch on the modem.
To call a big time-sharing service you
will want your modem to tran smit on the
/ OIl"er ORI GI NATE band . Dial the number.
When you hear the ANS WER tone , place
the teleph one hand set into the coupl er
wit h the phone' s mouthpi ece in the
modem' s " speaker " muff. (Try to do
thi s gently as some noises can discon-
nect you.) As soon as the handset is
seated. turn on the modem and invoke
the emulator by typing " TE."
CIRCLE 29 ON FREE INFORMATION CARD 77
CIRCLE 49 ON FREE INFORMATION CARD
CIRCLE 28 ON FREE INFORMAT ION CARD
CLIP AND MAIL COUPON TODAY TO:
POLY PAKS, INC.
P.O. Box 942, RA8
S. LYNNFIELD, MA. 01940 (617) 245- 3828
TOMAGAZINE RETAILERS:
loIagaZlne please<l to annoonce ils DIsplay
AllowancePlan" available10 relailers inl Ofested in earning a display
allowanceon IoIagaZlne. Toobtain deta,lsandacopy
01theIOfmal contract, please wnte tol heloIar1<etingOepamnent, Kable
NewsCompany, Inc., 777Third Aveooe, New Yorl<, New YOfk 10017, our
nalionsl whowil l act as 01ourplan. Underour
Relail DIsplay AllowancePlan. in consi<IeralionIOf fulfil lingcond,tions of
lheagreemanl , youwill beant,lIed10 receIVea dospiay allowance. This
planW111 become efte<: livefOf all issuesyoureceivesubsequenl loWillian
acceplanceonour behalf 01 your appilcation.
threaded rods without heads and require
a nut and washer on eac h side of the
wood strip. Tighten the bolt s and attach
the vertical wood strip/bo lt as semblies
to the frame as shown in Figs. 5 and 6,
using a 1/4-inch nut on each side of the
metal rib as shown. Se t the spacing be-
tween the vertical wood strips and the
frame according to the dimensions in
Fig. 5, but tighten the bolts j ust finger-
tight.
For ease in sett ing the spacing be-
tween the rib and the redwood ve rt ical
strip, cut 13/ 16-inch, 3
7h2
-inch, and 7
1/4-
inch spacer blocks. Use them to set the
spacings at points 24, 48, and 72 inches
up and down from center. (See Fig. 5.)
Figure 9 shows the 7
1/
4-inch spacer in
place while one of the 12-inch bolt s is
being adjusted.
It is very important to position the
ve rt ical strips so that the horizontal
stri ps lie flat across them. That is why
the adjustment bolts were left just
finger-tight-to allow for the slight left
or right movement necessary for align-
ment. Once the horizontal strips have
been inst alled. the adjustment bolts will
be tightened.
Attach the 3/4x 2-inch horizontal
wood strips to the vertical strips as
shown in Fig. 4. At each latt ice joint use
glue and a 11/4-inch brass screw. Pre-drill
the screw ho les-preferabl y with a pilot
drill-otherwise you' re likely to break
the sc rew or sp lit the wood .
We'll show you how to handle the
lattice comers when we continue with
the 8-Ball next month. R-E
REFERENCES
Roger L. Hicks, " RS-232", 80 Microcom-
p uting , March 1980, p. 136 (a good
so urce of serial-port inf ormati on for
TRS-80 users).
Aust i n Lesea, Rod nay Zaks , Microproces-
sor Interfacing Techniques, Sybex, 1977.
Gart h Nash, " Low-Speed Modem Funda-
menta ls," Motorola applicat ion not e
AN- 731.
Don Lancaster . TV Typewri ter Cookbook,
Howard W. Sarns, 1978.
a-BALL ANTENNA
contil/lied from page 48
formation utilities. And the fut ure
promises even more. A wo rd of caution.
though, to the overenthusiastic: long-
distance is so metimes the next best
th ing to bankruptcy! R-E
FREE!
NEW CATALOG OF
BARD-TO- FIND
PRECISION TOOLS
CI RCL E 18 ON FREE INFORMATION CARD
J e nsen's new catalog Is
packed with more than 2000
quality Items. Your single source
for hard-t o-find precisIon tools
used by electronic technlcians.
scientists, e ngineers. schools, In-
strument mechanics, laboratories
and government agencies. ThIs
popular catalog also contains
Jensen's worldfamous line of
more than 40 tool kits. send for
you r free copy todayl
JENSEN TooLs INC.
1230 sourn PRIEST DRIVE
TEmpe. ARIZONA 85281
The system cal led should respond
with the " log-on" prompt. If it doesn't ,
re check the selection of options-espe-
cially the recognition character and
channel-and try aga in. (You must hang
up and then redial.) If you still have no
success, repeat the hardware and soft-
ware tests that were recommended ear -
lier. Try to isolate the general source of
yo ur troub le. If you have a patient friend
who has a modem, he can be a great
hel p. Get him to send you data while you
try various co mbi nations of options. If
the problem is in the modulator-half of
yo ur modem, have him monitor your
transmissions , informing you each time
you transmit something accurately.
The important question of whether
the problem is in the modem or in the
co mputer can be best answered by sub-
stit uti ng your modem for the modem in a
working system-perhaps even one at a
compu ter store . Finally, don' t overlook
th e tel ephone itself. The most frus trat-
ing problem we have encountered was
produced by a de sk phone with a bad
duplex ne twork.
Once your system is running, you can
look forward to making new friends via
the CBB's (Computer Bulletin Boards)
a nd programs like MicroNET's CB sim-
ulator. Yo u wi ll also have access to a
very broad so urc e of programs and in-
BUILD A $60 MODEM
COl/til/lied from page 77
RUSH ME YOUR FREEDISCOUNTCATALOGI
NAME: _
ADDRESS: _
CITY: _
STATE: ZIP: _
Electronic Specialists, Inc.
171 South Main Street. Natick. MA 01760
Technical & NonBOO: 16176551532
Pal. #4,259,705
Power Line Spi kes and Hash ofte n cause
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OUR pat ent ed ISOLATORS eliminat e
equipment int eract ion AND curb damag-
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Spi ke Suppression . 125 VAC, 15 Amp,
1875 W Total - 1 KW per socket.
ISO-1 ISOLATOR. 3 Fil t ered Sockets;
1000 Amp 8/20 usec Spike Sup-
pressor $62.95
ISO-4 ISOLATOR. 6 Fi ltered Sockets;
1000 Amp 8/20 usec Spi ke Sup-
pressor $106.95
ISO-3 SUPER-ISOLATOR. 3 DUAL fil
t ered Socket s; 2000 Amp 8/20 usec
Spi ke Suppressor $94.95
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78
SATELLITE TELEVISION
SATELLITE equi pment cat alog. Over 25 of t he
best manuf acturers and suppliers, LNA's. receiv-
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Enjoy Satellite TV Now
SATELLITE televlslon compl ete elect ronics, just
add antenna. 24 channel receiver. 120 LNA.
modulator. feed horn (specify parabolic or spheri-
cal). with all required cables and connectors (75').
$2500. Data sheets $2. Delivery stock to 45 days.
KIRBY SATELLITE SYSTEMS, Box 87 .
Cheyenne. OK 73628
SATELLITE televlsion...Howard/Coleman boards
to build your own receiver. For more informati on
write: ROBERT COLEMAN, Rt. 3. Box 58-ARE.
Travelers Rest. SC 29690
SAVE $$$1 Satellite tel evision manual, source
catalogue. Dishes. receivers. complete systems.
Design. programing. Illustr ati ons. photo s. $3.95.
WESTCOLONY . Dept -E. Box 9471. Fresno. CA
93792
We don't just
sellinformatloni
We Manufacture
Hardware!
From offshore oil rigs.
data links to hotels
and backyard instal-
lations. we wrote the
book. Constantlyup-
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technical Informationbookandcataloggivesyouall
thefacts. Inexpensivedishes. feeds. telem-
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$7.95today! CALL
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C SPACECOAST'
RESEARCH CORPORATION
P.O. Box 442-E, Altamonte Spgs, FL 32701
TorunyourownclaOllfiad ad.put onl wordoneachof the lin.. belowand send thisformalongwithyour check
for $1.65per word (minimum15WOrdl) to:
CLASSIFIED COMMERCIAL RATE (for fir ms or individuals offer ing commercial prod ucts or ser-
vices). $1.65 per word prepaid (no charge for zip code) .. . MINIMUM 15 WORDS. 5% discount
for 6 issues. 10% for 12 issues within one year. if prepaid.
NON-COMMERCIAL RATE (for individuals who want t o buy or sell a personal item) $1.00 per wor d
prepaid. . . no minimum.
ONLY FIRST WORD AND NAME set in bold caps. Additional bol d face (not available as all caps) at
10 per word . All copy subj ect to publisher's approval. ADVERTISEMENTS USING P.O. BOX
ADDRESS WILL NOT BE ACCEPTED UNTIL ADVERTISER SUPPLIES PUBLISHER WITH PER-
MANENT ADDRESS AND PHONE NUMBER. Copy to be in our hands on the 26t h of the third mont h
pr eceding the date of the issue (l.e. August issue closes May 26). When normal closing date falls on
Saturday. Sunday. or a holiday. issue closes on preceding working day.
That 's what t he ads say. I s it t r ue? Well . yes
-:.. no. You can r ecei ve 75 to 200 channels. but
not j ust anywhere. Th ose ads are written t o
~ ( ' I I expensive equi pment. whi ch you mi ght not
ven he able to use. Only a complex computer
analysis of your location can tell for sure .
We offer an i ndependent computer analys is
of your l ocat ion. anywhere in t he wor ld. Our
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~
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79
8
95
Each
haeli
These top-quality metersallow
you to monitor critical circuits.
Featureeasy-to-readfaces and
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0-50 IlA DC. 270-1751 8.95
0-1mA DC. 270-1752 8.95
Easy-to-read O.4-tali liquid crystal display with
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Measures up to 500VACin 4 ranges; 1000VDC
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ranges each; 20 megohms resistancein 6 ranges.
Size: 6:Y.x3:Y,x H ' . ~ Leads and manual included.
Requires 9V battery or ACadapter. 22-198.79.95
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Micronta@Precision
Panel Meters
- 10-Meg Input
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l.IIli!Bi!iiiI_. ;;'
22-153 -
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79
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lad10
Mini Amp with Built-In Speaker
Only
11
95
- 200 mW Output
- 1 mV Sensitivity
- 10 to 10,000 Hz
Response
Each
250WVDC.Aluminumdeposited
mylar for ultra-lowleakage. Epoxy
dippedfor stability
Il
F Cat. No. Each
.01 272-1051 .39
.047 272-1052 .49
.1 2721053 .59
.22 272-1058 .69
.47 272-1054 .79
1.0 272-1055 .89
This compact, integrated-circuitamplifier with built-in speakeris ideal
for use With a telephonepickup coil, a microphoneor electricguitar.
Use it as an intercom.the audio stage of a receiver project-or adda
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39
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100%prime. Our
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276-2505 .. Now 5.95.
Type 558. Four type
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276-1742 ... Sale 1.99
~ : ~ : : : ; : : = = : ~ : : ~
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Acceptsb&wor color video, 30-15,000Hz
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Reg. 2.49
1
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2
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2761714 2.99 275-259 Sale 2.09
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276-1777 4.99 1.2 to 37VDC 275027 1.19
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95
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276-1570 5.95
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Retail prices may vary at individual stores and dealers OVER8000 LOCATIONSWORLDWIDE
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400V.276-1000 1.19
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Micro Test Clips
NEW! 149
Package of 2
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270-370 . . . . . Pkg. of 211.49
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L ~ : 99
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80
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ee
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S18.75
529 .95
5140 00
MPSA18 .12
MPSA42 .16
MPSA43 .16
MPSA56 .12
MPSA70 .14
MPSA92 .14
MPSA93 .12
MPSA14 .12
MPS2925 .12
MPS2926 .12
MPS3391 .12
MPS3392 .12
MPS3393 .12
93.50
DUAL-iN-LINE
LOW PROFILE
I.C. SOCKETS
CONTACTS PRICE
8 PIN .07
14 PIN .11
16PIN 4 .13
18 PIN r!; .17
20 PIN l::.y .19
22 PIN .21
24 PIN .23
28 PIN .27
40 PIN .39
2N5770 .12
2N5771 .13
2N5772 .14
PN2222A .089
PN2369A .089
PN2907A .089
PN3565 .12
PN3567 .12
PN4249 .12
PN5138 .099
MPSA05 .12
MPSA06 .12
MPSA13 .12
EPROM'S
7.95,
C2708 5 4.75
l K :t.8 4S0 n.."
C2716/TMS2516 IInr",1"CISlQn, 56.98
16K 450NS Singre 5V SUppl 'f
TMS2532 IT I Pin Oul l
32K (4096 t 81450 ns
C2732 (Intel verstom
32K f4096 x 8 ) 450 ns.
TMS2564
64K 18Kx 8) 450 ns
16K STATIC RAM Specl., $22.95
TMM2016-3' 16K 12K ,. 8) 300NS
16K MOS DYNAMIC RAM'S (16 PIN)
411620 (200NSJ $2.98
4116-30 /300NS) Ceremc Specl.' 2.45
4K MOS DYNAMIC RAM' S
TMS406030 Specl.' 2.65
4K 14Kx 1) 300NS 22 PIN
16K CMOS STATIC RAM Specl.'
6116 16K f21< l 8l150NS 16 PIN 544.00
64K MOS DYNAMIC RAM
4164 64K 1641( _ 11 200NS 16 PIN $36.00
416464K (64K x l ) 150NS 16 PIN 548.00
1.29
3.95
1.29
.54
.54
.54
.65
7.45
7.65
7.65
5.72
7.95
10.85
10.95
4.65
8.65
6.45
19.95
2.65
3.65
2.65
29.50
2.65
2.65
LM741CN-a .28
LM747CN 14 .50
3.45 LM748CN8 .39
.99 LM1458N-a .47
.62 LM1488N 14 .83
.25 LM1489N14 .64
.52 LM1495CN14 2.54
.84 LM1496CN 14 1.36
.59 LM2211CN14 2.75
3.84 LM2240PC 1.95
.94 LM3081DC 1.56
.48 LM3403N14 .85
1.46 LM3524PC 2.85
1.36 LM3900N .48
3.30 LM4136N 14 .66
.59 ULN2003AN .8
1500V
1500V
\ 500V
1500V
1500V
2500V
1500V
6800 CPU
6802 CPU
6808 CPU
6809 CPU
6810
6820
6821
6845
6850
6852
6502 CPU
6504 CPU
6505 CPU
6520
6522
6532
6551
PROM'S
2.50 256 bit. 16 PIN
2.50 256 bit. 16 PIN
3.45 1K, 16 PIN
3.45 1K. 16 PIN
4.95 2K. 16 PIN
4.95 2K. 16 PIN
7.95 4K. 18 PIN
8.45 4K. 24 PIN
19.95 4K. 24 PIN
27.95 8K, 18 PIN
19.84 8K. 24 PIN
78.00 16K. 24 PIN
.32 LINEAR i.c.s
.29
.88 XR2206CP
.95 LM348N14
1.56 LM358N8
1.49 LM555N8
1.03 LM556N 14
.62 LM567CN 8
1.19 LM709CH
1.48 LM714CH
4.65 LM723CH
.48 LM723CN 14
.48 LM725CN 8
1.29 LM733CN14
3.65 LM739CN14
1.98 LM741CH
595
7.95
4.45
6.45
6.95
1.98
3.45
1.98
3.45
1.98
4.98
4.95
7.45
4.95
7.95
7.95
8.45
36.00
32.00
MICROPROCESSOR
CHIP SETS
745288
74S188
93427 /825129
93417/825126
9344617621
93436/7620
93453/7643
9344817641
93451 /825181
825 18517128
74S47817132
82S19117 13e
8035 CPU
8039 CPU
8080A CPU
8085 CPU
8155
8212
8214
8216
8224
8226
8228
8251
8253
8255
8257
8259
8279
8748
8755
LM301AN8
LM307N8
LM3Q8N8
LM308CH
LM309K
LM310HC
LM311CH
LM311N8
LM318N8
LM318CH
LM323K
LM324N
LM339N
N8T26N
N8T28N
SN76477NF
R's and TRIAC's
CIOSO .34 SCA 5 amp 4QOVTO-22O
TIC44 .36 SCA 06 amp 30V TO92
TIC47 .42 SCA 0.6 amp 200V TO-92
TIC1168 .97 SCA 8 amp200 VTO'220
TIC116D .99 SCA 8amp400VTO220
T1C126B 1.09 SCA 12amp200VTO220
T1C126D 1.18 SCR 12amp400VTD22O
TIC216B .99 Tnac 6 amp200VTO 220
TlC216 D .99 Triac 6amp400VTO -220
TIC226D 1.09 Tri ac 8amp 400V TO-220
lIC2360 1.39 Triac 12amp400V TO220
TIC246D 1.45 Tnac 16 amp 400VTO-220
lIC263D 2.25 Triac 25a mp 400VTO-220
2N1595 .89 SCA 1amp SOVTO -5
N640t 1.56 SCA 16ampl00VTO 220
CAN TRANSISTORS
SIGNAL POWER TO92 SMALL SIGNAL
2N404A 1.20 2N3055 .56 2N3702 .099 2N4402 .079
2N697 .29 2N3440 .56 2N3704 .099 2N4403 .079
2N706 .29 2N377 11.29 2N3706.099 2N4410 .15
2N1613 .29 2N37721.29 2N3710 .099 2N5087 .12
2Nl7l1 .29 2N3n31.89 2N3904.069 :g
2N1893 .29 2N6133 .56 2N3906 .089 2N5220 .14
2N2222A .19 2N64891 .25 2N3907.099 2N5221 .14
2N2369A .22 2N65454.75 2N4123.075 2N5223 .14
2N2484 .24 2N4124 .075 2N5226 .14
2N290SA .39 2N6055 1.45 2N4125 .075 2N5227 .14
2N2907A .19 2N6079 3.85 2N4126 .075 :g
2N30S3 .29 2N4401 .079 2N5551 .14
OPTOELECTRONICS
L.E.D. LAMPS
T 1 3 mm Red
T13mmGreen
T-1 3 mm Yellow
T134 5 mm Red
T P . 5 mm Green
T1
145
mm Yellow
DISPLAYS
FN0 357 375" Common Cathode .99
FN0 500 500" Common Cathcoe .99
FN050 7 500" Common Anode .99
DL1416 25.00
4 di git 16 segment alphanumeric dIsplay 16 hi
ISOLATORS
Dual Octo Isolator
Quad Opto Isolator
Dual octoIsolator
0010 Coupler
octoCoupler
Opto Isolator
Octo Isolator
l ED209
l E0 211
lED212
LED220
LED222
LED224
6.45
6.45
Pri ce
3.65
1.25
2.98
2.65
3.45
9.95
7.95
ACTIVE CONTINUES TO HOLDTHE LINE ON PRICES
Spec'.' 3.95
COMPUTER SUPPORT CENTER
CMOS
CD4040BE .64 C04108BE 1.69
CD4Q41BE .89 CD4510BE .58
CD4042BE .54 CD.t511BE .56
C0 4043BE .70 CD4512BE .72
C04Q44BE .48 C04514BE 1.68
CD4046BE .96 C04515BE 1.54
C04047BE .69 C04516BE .75
CD4049BE .38 C04519BE .52
CD4050BE .32 CD4520BE .56
CD4051BE .79 CD4522BE .78
CD4052BE .79 CD4526BE 1.25
CD4053 BE .79 CD4527BE 1.59
CD4060BE .89 CD4528BE .72
CD4066BE .48 CD4531BE .84
CD4068BE .24 CD4532BE .84
CD4069BE .18 CD4539BE .59
CD4070BE .24 CD4543BE 1.44
CD4071BE .24 CD4553BE 2.89
CD4072BE .19 CD4555BE .58
CD4073B E .24 CD4556BE .58
CD4075B E .24 CD4581BE 1.89
CD4076BE .54 CD45B2BE .69
C04078BE .24 .42
CD4081BE .18 CD4585BE .79
CD4082BE .18 CD4702BE 8.95
CD4085 BE .44 40097PC .72
CD4086BE .54 40098PC .72
CD4093BE .58 40161PC 1.20
CD4099BE 1.75 40174PC .98
CD41Q4BE 2.36 40175PC .98
5101
Part No .
210135 It< 1256 x 41 350NS 22 PIN
210225 It<(IK x 1) 250NS 16 PIN
P21 1145 It< (256 x 4) 450N S 18 PIN
P2112 35 It< (256 x .q 350NS 18 PIN
2114l l ow Powe r otK (1024 x 4) 300NS
2147 ott( (4K x l j55NS
2147 4K (4K x 1J 70 NS
UART's
AY510 13A
40 Khz Single 5V Supply
IK CMOS RAM
lK (256 x 4) 4S0NS 22 PIN Low Power 3.45
4K CMOS RAM
P6504 4K (4K x 1) 550NS 18 PIN l 1QMW
P6S14 4K 11K x 4) 450NS 18 PIN 110MW
SHIFT REGISTERS
1403A (TO-5) dual 512 bit 2.98
1404A (TO-S) single 1024 bit 2.98
3341APC FIFO 1 MHz 4.75
3342PC 64 b,1 3.95
3347P C 80 bIt 3.45
CD4oo1BE .18
CD4oo2BE .18
CD4006BE .59
CD4007BE .24
CD4008BE .67
CD4009BE .39
CD4010BE .39
CD4011BE .18
CD4Q12BE .18
CD40 13BE .29
CD4014BE .56
CD4Q15BE .56
CD4016BE .32
CD4017BE .54
CD4018BE .52
C04 Q19BE .48
CD4020BE .68
CD4021 BE .57
CD4022BE .79
CD4023BE .19
CD4024BE .44
CO.tQ25BE .20
CD4026BE 1.45
CD4Q27BE .42
CD4028BE .54
CD4029B E .69
CD4030BE .38
CD4033BE 1.67
CD4034BE 2.44
CD4035BE .69


zaDSIDIO MHI 22.45
IloA510 /o 0 MHI 27.15
ZlIOCPU MHz 6.95 180-S10/1 Wil 22.45
II0ACPU 0 M" I 9.45 IloA510f1 0 M"I 27.15
ZSOPIO I MHI 5.45 110510/2 I MHI 22.45
II0API0 0 MHI 7.65 Il oA510/2 PMHI 27.85
ZSOCTC I M" I 5.45 11051019 I MHI 16.85
II0ACTC 0 MHI 7.65 110A-SIOJ9 0 '-'HI 21.54
110OMA I M"I 15.95 110DAHT I M"l l ' .95
ZIOA OMA 0 MHz 22.95 la OA DART a MHz 14.85
MOS MEMORIES
MOS Static RAM' s
DIODES & RECTIFI ERS
1 AMP RECTIFIERS 3 AMP RECTIA ERS
IN4001 .04 IN4005 .08 IN5400 .14 IN5405 .21
IN4002 .05 IN4006 .07 IN5401 .15 IN5406 .23
IN4003 .06 IN4007 .08 IN5402 .17 IN5407 .25
IN4004 .06 IN5403 .19 IN5408 .26
IN5404 .20
SUPER SPECIAL
IN250B 37 amp 200V 52.17
ZENER DIDOES
IN4728A - IN4752A (1 watt) .14
IN4753A - IN4754A (1 watt) .28
IN746A - IN759A (400 mW) .10
IN5224B - IN5252B (400 mW) .1T
IN5336A - INS378A (5 watt ) .53
SWITCHING DIODES
IN9l 4B .04
IN4148 .04
10410ADCIHM2106 7.95
256 x 1 blt fully decoded 15N5 16 pin
CLOCK CHIP
MSM5832RS 12.95
Microprocessor Real-time Clock/Calendar
PLASTIC POWER TRANSISTORS
T1P29A .37 TI P41B .57 TI P122 .72
TI P29B .38 TIP41C .59 TI P125 .72
TIP29C .39 TIP42A .57 TI P126 .n
T1P30A .39 TI P42B .59 TI P127 .84
TIP30B .42 TI P42C .64 TIPl 40 1.44
TIP30C .42 TIP11() .54 TIP141 1.64
TIP31A .38 TIP111 .57 TI P142 1.96
TIP31B .42 TIP112 .64 TIP145 1.84
TIP31C .45 Ti P115 .55 TIP146 1.98
TI P32A .42 TIP116 .59 TIP147 2.25
TIP32B .45 TIP117 .64 TI P2955 .83
TIP32C .48 TIP120 .64 TIP3055 .70
TIP41A .55 TI P121 .68 FT3055 .59
ECL RAM
CIRCLE 31 ON FREE INFORMATION CARD
81
PLANS & KITS
EPROMS 2732 Fujitsu prime 450ns single 5V
supply . $17.50. SABADIA EXPORT CORP. Box
16969, Temple Terrace, FL 33687. Telex 803712
WRITE FOR

SPEAKER &ELECTRONICS CATAlOG
1001 BARGAINS IN SPEAKERS
Tel.: 1 (1116) ll42 509"l
FOR SALE
CABLE TV converters and equipment, micro-
wave antennas and downconverters. Plans and
parts . Build or buy. For information send $2.00.
C&D COMPANY, PO Box 21, Jenison, MI 49428
SUPER microwave TV downconverter complete
assembled system, ready to hook up. $159.95 PC
board set with plans $25.00. HOBBI SHACK, P.O.
Box 235, Jersey City, NJ 07303
DO you have a new idea! And wish to market itl
Write to NEW ENGLAND ELECTRONICS R&D
DISTRIBUTORS, P.O. Box 9587, Providence, RI
02940. We will research it and advise you. Send
$5.00 for postage and handling .
CB RADIO
100 brand new Philips cable TV converterslVCR
programmers. $3560 (US funds). Prepaid to your
door. Sample $48. BIRNBOM, 3655 Ridgewood,
Suit e 103, Montreal , Canada H3V lB4 (phone
514-739-0614) USA Inquiries
WANTED
MIRROR in the lid, spinning disc, and other pre-
1946 television sets wanted. Call collect: (203)
521-5280
CABLE TV EQUIPMENT
MICROWAVE television education manual! New
pUblicatuon explores concepts, antennas,
downconverters: $16.25. Information package
on microwave and other exciting television
products: $2.00. ABEX, P.O. Box 266D1-RM, San
Francisco, CA 94126
ELECTRONIC catalog . Over 4,500 Items. Parts &
components. Everything needed by the hobbyist
or technician. $2.00 postage & handling, refunda-
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funds). T&M ELECTRONICS, 472 East Main
Street, Patchogue, NY 11772 (516) 289-2520
GET more CB channels and rangel Frequency
expande rs, boosters, speech processors, inter-
ference filters, VOX, how-to books, plans. Cata-
log $2. CB CITY, Box 31500RE, Phoenix, AZ
85046
ELECTRONIC
ORGAN KITS
3-4 Manuals
AMAZING ELECTRONIC PROJECTS and PRODUCTS:
Lasers Super Powered. Burning Cutting. RUl e. Pist ol.
Pocket. See in Dark-Shotgun Directional Mike-
Unscramblers-Gi ant Tesla-Stunwand- TV Disrupt-
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VICE. Catalog$1. InformationUnlimited, Dept. RS eox
716 Amherst, N.H. 03031.
PORTABLE digital capacitor meter with 1%accu-
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available CMOS IC'S. Build for under $25.00!
Etched PCB and plans-$12.95. Calibration
components included . DRISCOLL ELECTRON-
ICS, 57 Scofield Ave., Bridgeport, CT 06605
UNIQUE electronic plans: 2.4 GHz microwave
downconverter system, $5.00. Telephone mem-
ory dialer, negative ion generator, $4.00 each.
All three sets, only $10.00! Parts, kits available.
Send SASE for more information. COLLINS
ELECTRONICS, Box 6424, San Bernardino, CA
92412
ORDER No. T17AE047
ROUTE9N.
PLATTSBURGH, N,Y. 12901
T. I.: (51S1 561-8700.
AUTOMOTIVE security, safety, and convenience
circuits. 10 tested plans $2.00. ELA, Box 44334,
Cleveland, OH 44144
AUDIO kits. Equalizer-twelve bands/channel
$100; 24, $225; noise reducer/expander, $110;
LEDmeter, $42; see R-E cover stories 5/78, 3/81 ,
2/80, or send stamp for catalog . SSS, 912R
Knobcone, Loveland, CO 80537
END adjacent channel interference on your TV
set. Unique device enables your ordinary set to
separate all channels completely. Makes new
programs available. Complete plans, $5.00. REL-
TRON, Box 921103-R2, Clevelnd, OH 44101
TELEVISION alignment-in minutes-while ob-
serving revolutionary pattern. Check RF, IF, video
instantly! So simple and inexpensive it 's incredi-
ble. Complete plans-$8.00. Free details. E-Z
LINE, Box 2702R, Clearwater, FL 33517
THEATER and CLASSICAL
Re;undeble Parts
Wurli tzer reproductions Brochure $2.00 Catalog $1.50
d'lh, DEVTRONIX ORGANS, INC . Dept60
6101 WAREHOUSE WAY SACRAMENTO. CA95826
ONE-MAN
FACTORY
HIGHLY
PROFITABLE
ELECTRONIC
PRINTED circuit boards from sketch or artwork.
Kit projects. Free details . DANOCINTHS INC.,
Box 261, Westland, MI 48185
MODULAR power supplies, relays, IC, P-amps
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PROCESSOR CONTROL SPECIALISTS, 18 Roy-
al Lane, Londonderry, NH 03053
PALOMAR-pride-exclusive repair facility.
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MICROWAVE television "downconverters" un-
der $50.00. High quality, easily assembled. Cata-
log: $2.00 (refundable). NDS, Box 12652-R, Dal-
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LOWEST prices electronic parts . Confidential
catalog free. KNAPP, 4750 96th SI. N.. SI. Peters-
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Investment unneces sary , knowled ge not reo
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Walnut Creek, CA 94597.
FREE catalog IC's semis , parts. CORONET
ELECTRONICS, 649A Notre Dame W., Montreal ,
Que, Canada H3C 1H8 US inquiries
NEGION generator. Build using ignition coil!
Plans, PC artwork, $1.00. HOMEBREW ELEC-
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SAVE 90%. Build your own micro or minicomput-
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E, 2723 West Butler Drive, Phoenix, AZ 85021
DECODE Morse and RTTYsignals off the air with
our Morse-A-Word or RTTY Reader. Morse-A-
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factory wired. Call or write for details . MICRO-
CRAFT, Box 513R, Thiensville, WI 53092 (414)
241-8144
BUILD a frequency standard as accurate as
WWV. Use to verify accurac y of your frequency
counter. Complete circuit $8.00. Send stamp for
kit information. DA PRODUCTS, PO Box 566,
Hampshire, IL 60140
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CIRCLE 5 ON FREE INFORMATION CARD
83
FREEl Discount electronics catalog. Over 4'1. mil-
li on sati sfie d customers ! Low low pri ces on IC' s,
LED' s, reado uts, compuler peripherals, audio
co mponent s, solar produ ct s and much much
more. POLY PAKS, Box 942 REC, Lynnfi eld , MA
01940
DOWN converter power supplies 7- 14V DC 50rnA
$29.95 asse.mble d and t est ed, plus $3.00 post age
and handling. MDS down conver t er repairs
$29.95 includes par t s. Send di agram and re-
freq uency, plus $3.00 postage and han-
dhng. MRF 901-$2.59 each, chip caps 470pF 35
each, HP5802-2835 sub., for MA-4882 micro-
wave diodes $1.50 each. Minimum order $10.00.
Send money order or bank check to: NEW
ENGLAND ELECTRONICS R&D DISTRIBU-
TORS, P.O. Box 958 7, Providence, RI 02940
PICTURE tube rebuilding equipment- we sell
and buy new and used equipmen t. Free t raining.
ATOL TELEVI SION, 6425 Irving Park, Chicago,l L
60634, Phone 3 12-5 45-6667
QUALI TY ELECTRONIC PARTS
AT WHOLESALE PRICES
MICROWA VE receiver for MDS TV compl et e and
ready t o inst all. 24 db gain; $250. ALEX, (215)
568-4264
SAVE up to 50% on name br and test equipment.
Free catalog and pr ice list . SALEN ELECTRON-
ICS, Box 82- F, Skoki e, IL 60077
RESISTORS '/.W, '/'W 5% car bon films 3 ea. No
minimums. 1% met allilms. Send for deta ils. Bulk
pr icin g available. JR INDUSTRIES, 5834-C Swan-
creek , Toledo , OH 436 14
ELECTRONIC deal ers & hobbyists! Send name &
add ress f or "free catalog" & be placed on mailing
list for monthly speci als. Free t echni cal assis-
tance available wit h orde r. ROBERT MILLER,
Dept. RE 2, Box 391, Bay St ati on, Brooklyn , NY
11235
COMPLETE line of microwave television con-
verters and accessories to suit your needs. Con-
verters have a one yea r warranty backed by a 3
yea r reput ation. Call or wri t e for compl et e spec if i-
catio ns and pri cing. Dealer inquiries invited.
TRITON MARKETING, 1933 Rockaway Par kway,
Brookl yn, NY 11236 (2 12) 531-9004
va-actcr UHF t uner, mode l UESA55F $1995
Pri nted cucuu board cre-cnnec $189S
PCB pcteencmeter. 120K. 1-K& S tOK (7 pesl 5595
gesrs tor ki t 1/ 4W . 5-. carbo n 111m (32 pes) $4 9S
Power transforme r pr l -l17VAC. se-c-2oiVAC.
250mA 56 95
6 PP2-SW Panel-mount pcte nucmete rs & knees 11K a taper
& 1-1 0K w/sw 5595
7 SS14SW IC s (7 pes t. mcee s ('" ea I. (2 u ) & heal
Sink (1 ea t $29 95
8 CE9-SW El ect rol yhc cacecuc r k.lt (9 ea I $5 95
9 CC33 SW Ceramic o.ec cacacuors 50 WV (33 pes ) $795
10 CH=iW Variable ceramic trimmer capacitors 5!65 pF
(6 pes! $595
11. l4SW COil k.lt 2 ea 18...H.1 ea 22..H .ncccteeces pre-
wound and 1 ea 137-12 temte ter cer cere With 6 !t
* 26 wire $500
12 ICSSW IC sockets: lin Inl ay, eoroertau. 5 ea 8,p,n & 2 ea
14-pln $195
13 SRSW Speaker & enclo sure With pre-punched back board
$1495
14 MISC Miscellaneous kit mcfuces hardware. 632 & 8-32
screws, bolts . wire. ant terminals , DPDT SWItch,
Iusenojcer. et c $9 95
When orde ring all Items 1 thru 1'" total pnce IS $13995

ip;
"'='s:::,--c-, : antenna 7 elemenl 7511 Chonne" " "54
11 5d8 galn $9 95
COAX zs n cca x cabl e , RG/59U-1 1c per toot
FS9 Coax conne ctors JOe ea
Mt 1 Specral UHF 753OQDmalchlng transformer $1 "'5
A-1 Indoo r VHFUHF antenna amplifier 30QU In-out
13d8ga," $1995
Min order amoun t IS$1995, add 10'"- . Shlppmg &
handling Over $40 add shIppIng & handli ng
Calif . resrcents add lor sales tax Catalog
send $100
Simple Simon Elect ronic Kits
11850 S Hawthorn e Bl vd
Hawthorne. Cali f 90250
Visa-Mastercharge OK. Telephone 213-675-3347
CIRC LE 14 ON FREE INFORMATION CA RD
f "N ON/ COU[\I[fl. QQO Fo.r Oc ks Av'('lUE' ccscoeoo
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TELEPHONE or ollice bugged? Lat est det ecti on
equipment fin ds out fast . Free lit eratur e. CLIF-
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FREE speaker cat al og1Woof ers, mi ds, t weeters,
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VERSAL SOUND, Dept. RE, 2253 Ringli ng Bl vd.,
Sarasota, FL 33577, (813) 953 -5363
@NG NEW TRAILS IN
ELECTRONIC551NCE1949
2150 megahertz downconverters $99. 95 up, as-
sembled. Details for SASE. GW ELECTRONICS,
POB 688, Greenwood , IN 46 142
SCANNER mo nitor accessories-kits and fac to -
ry assembled. Free catalog. CAPRL ELECTRON-
ICS, Route 1R, Canon, GA 30520
END adjacent channel interference on your TV
set. Unique device enables your ord inary set to
separate all channel s completely. Makes new
programs available. Complete plans, $5.00. REL-
TRON, Box 91103-R1, Cl evel and, OH 44101
RECONDITIONED t est equipment. $1.00 for cat -
al og-JAMES WALTER TE ST EQUIPM ENT,
2697 Nickel, San Pabl o, CA 94806
NOSTALGIA crystal radi o. Exper tl y handcraft ed.
Traditional sty le. Asse mbled and tested. Write for
inf ormat ion. BOB RYAN, P.O. Box 3039 , Ana-
heim, CA 92803
BREADBOARD one EXP30 0 power supply
switches. L.E.D. indicalors assembled $58 .50.
$2.50 S&H. R-E ELECTRONICS, 11002 Hammer-
Iy 32, Houst on, TX 77043
RF power t ransistors-tubes-special parts for
" ham" linears. MRF454 $ 17.00, MRF455A
$14.00, 8950 $9.00, 6LF6 $5.50, catalog and
cross-reference help available. COD -Visa/MC.
WESTCOM 1320 Grand, San Ma rcos, CA 92069.
(714) 744-0728
F
CIRCLE 37 ON FREE INFORMATION CARD
901 Fuli nnann Blvd.,
Buflalo, N_ YOftt, 14203.
Inpuls for RIAA phono. tepe with monitor , luner, auX.
lIIary and microphone; full tone eontrot circuitry. In-
credible performance: Response DC to 100 KHz,
dlslortlon 0.05%, SIN90 db. Oulput 104.5 VRMS. Sup-
plied with edge connectors. Compact. Rallable. Inl er-
nal voltage regulallon - use Irom 15 10 50 V saf elyl
Power Supply Units
Circuit bOards with all components plus TOROIDAL
Iransformers (except PSU30and36). Toroldals arehall
Ihe size and weight 01convenllonal transformers ; and
are Quieter and more elllclent. Note: HY6 and HY66
can also be powered from any supply.
PSU50 (:t: 25V)'or 1or 2 HY50 $33.80
PSU80 (:t:35V)forl HY120 51.00
PSU70 (:t: 35V)for 1 or2HY12O 64.00
PSU71S :t:45V)for 1or2 MOS12O 64.00
PSU80 ( :t:45V)for 1HY200 85.50
PSU 5 ( :t:45V)for 1 MOS200 72.00
PSU180( :t:45V) for 1HY4OO0r2HY200 89.50
PSU185( :t:55V)for 1or 2 MOS200 9s.oo
PSU3I ( :t:2OV) for 1or 2 HY30 33.80
PSU311 (:t: 15V)for 12HY6 or6 HY66 22.95
GlaDSTOnEElectronics
Phone Orders
(116) 849-0735
Vlaa or
Mastercard
Mall Orders: Check (Certified), or Money
Ord..... No C.O.D.os. Plasae add 5% .hlpplng,
CIRCLE READER SERVICE FOR CATALOG
o
POWERAMPLIFIER
MODULES
60 and 120 watl power amplifier modulas utilizing the
'ateat 1echnologlcal advance In audio ... the MOSFET.
irhey llrOlllde faster slew rate end complete absence of
ero.ao....r dl.tortlon. They are Immune 10 thermal
runaway. InCfaaslng long term reliability and eliminating
the need lor compllcatad protection circuitry which can
add dl"ortlon. Can operate Into complex loads without
dlfflcu!ty.
Like alllLP power ampllllers, the new MOSFETSare Iul-
Iy encapaulated 10bullt-ln haalslnks, require no external
parts, need only CONNECTIONS, and are war
ranted fo..-FIVE Ye....RS.
ERFORMANCE SPECIFICATIONS:
Frequ.ncy raeponse - 15 Hz - 100 KHz (-3 db). THO
(Typical al 1 KHz) - 0.005'10. 1M (60 Hz and 7 KHz
sl newave, '=1 ratlo) - .ooe'lo. SIN Ral lo (DIN standard)
_ 100 db. rale - 20 Vl uS. Rise lima - 3 uS. Inpul
aen.ltlvllyllmpedance - 500 MV/l00k ohm. Output lm-
pedance - 4 ohms 10 Infinity. Damping tactor - 400.
..01120 lilt tt MOSFET Powar Amplifier
(8ohms) S 79.95
MOS200 120wall MOSFET Power Ampliller
(Soh"\?; $129.95
HYBRID Bulltln heatslnks
OWER 5 oonnectlons
5 year warrantyl
AMPS Prot cted circuitry
No external parts
required
PERFORMANCE SPECIFICATIONS:
Frequancy respon.e - 15 Hz - 50 KHz ( - 3 db). THO
(Typical at 1 KHz) -0.Q1 '10 1MDisiortion - 0.006'10. SIN
rallo - 100db. Slew rale - 15V1uS. Rise lime - 5 uS.
Input senslllvily/impedance: 500 MV/l00 Kohms. Damp-
Ing faclor - 400. Power raled lnto 8 ohms (except
HY400 ratad Into 4 ohms).
HY30(15wallsRMS) $25.95
HYto 30 walls RMSj $29.95
HY12O(60wallsRMS) 59.95
HY200(12Owalts) 79.95
HY400(240walls RMS) 99.95
FP4to "Bridges" 2 HY400s 20.00
for walts RMS at 8 ohms.
RACK MOUNT CABINET 549.95
Now available for MOSFETS, HY12O. 200, or 400. Back
panels are pre-cut for 2 amp modules . Power supply
mounts Inside chasals . SCreened faca-plate (19" x 5" )

Hyee Siereo HYe
$48.95 Mono
$25.95
84
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MICROPROCESSOR SUPPORT I.C. 'S
WE GUARANTEE FACTORY PRIME PARTS
We are going to become the largest supplier of prime
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NEC 16Kx1 DYNAMIC RAM 200 N.S.
These are prime 4116's from one of the best
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4116 200ns
8 for $25.00 32 for 96.00
8080A
8085A
8086
8088
Z-80
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CPU
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4.95
8.95
99.95
44.95
6.70
7.25
2708
2716
2732
4118
4164
Z80S
EPROM 1Kx8 4.50
EPROM 2Kx8 7.00
EPROM 4Kx8 19.00
STATIC 1Kx815.00
200ns 64Kx1 Call
CPU 21.00
NEC 1Kx4 STATIC RAM 250 N.S.
These are prime low power static ram's NEC
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2114L 250ns
8 for $25.00 32 for $96 .00
Z8 0 -P10 6 .0 0
Z80A-P10 7 .10
Z80-CTC 6 .00
Z80ACTC 7 .10
Z80-DM A 18 .50
Z80A-DMA 22.50
Z8 0 -S 10 / 0 18.50
Z80A-S1 % 22 .50
Z80-S10/ 1 18 .5 0
Z80A-S10/1 22.50
Z80-S10/ 2 18 .5 0
Z80A-S1 0/2 22 .50
3205 3 .95
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8 18 5 29.95
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8202 45.00
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8243 4.65
8 2 5 1A 5 .55
8253 9 .85
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8 255A-5 5.40
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8 257-5 9 .2 5
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8275 32.95
8279 10.80
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4002
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4 03 3
4 0 3 4
4035
4037
4 0 4 0
4 0 4 1
4 042
4 0 4 3
4 0 44
4046
4047
4048
4 0 4 9
49.95
.3 5
.3 5
.35
1 .39
.29
1 .39
.49
.49
.35
.29
.49
1.39
1. 15
.59
1:19
.99
.49
1.19
1 .19
1 .15
.38
.79
.3 8
2.50
.6 5
.8 5
1.29
.45
3 .25
2 . 15
2.1 5
3 .25
.95
1.95
1 .29
1 .25
.95
.8 5
.8 5
1 .75
1 .25
.99
.6 9
4050
4051
4052
4053
4055
4056
4059
4060
4066
4068
4069
4070
4071
4072
4073
4075
4076
4 0 78
4081
4082
4085
4086
4093
4099
4104
4501
4502
4503
4505
4506
4507
4508
4510
45 11
4512
451 4
4515
4516
4519
4520
4522
4526
4527
4528
.6 9
1.10
1 .10
1 .10
3 .95
2 .95
9 .95
1.39
.75
.3 5
.3 5
.49
.35
.35
.3 5
.35
1 .29
.3 5
.3 5
.3 5
1 .95
.79
.9 9
2 .25
1 .99
.3 9
1. 6 5
.69
8 .95
. 75
.95
3 .95
1 .39
1.39
1 .39
3 .95
3.95
1.69
.99
1 .39
.9 9
1 .15
1 .75
.99
4531
4532
4539
4543
4553
4555
4556
4581
4582
4584
4585
4702
74COO
74C02
74C04
74C08
74C10
74C14
74C20
74C30
74C32
74C42
74C48
74C73
74C74
74C85
74C89
74C90
74C93
74C95
74C107
74C151
74C154
74C157
74C160
74C161
74C163
74C164
74C173
74C174
74C175
74C192
74C193
74C195
.9 9
1.25
.99
1.99
3.50
'.7 5
. 7 5
1.99
1.01
.55
.9 9
9 .95
.3 9
.39
.3 9
.49
.49
1.65
.39
.3 9
.9 9
1.85
2 .39
.8 5
.8 5
2 .49
4.95
1.85
1 .85
1 .85
1.19
2.49
3 .50
2.10
2 .39
2 .30
2 .39
2.39
2.59
2.75
2.75
2.39
2 .39
2.39
74C925
74LSOO
74LS01
74LS02
74LS03
74 LS04
74LS05
74LS08
74LS09
74LS10
74LS11
74LS12
74LS13
74 LS 14
74LS15
74LS20
74LS21
74LS22
74LS26
74LS27
74LS28
74LS30
74LS32
74LS37
74LS38
74LS42
74LS47
74LS48
74LS51
74LS54
74LS55
74LS73
74LS74
74LS75
74LS76
74LS78
74LS83
74LS85
74 LS86
74LS90
74LS92
74LS93
74LS95
74LS96
6 .95
.3 5
.28
.28
.2 8
.3 9
.28
.3 9
.3 9
.28
.39
.3 9
.4 7
1.25
. 3 9
.26
.38
.3 8
.39
.3 9
.3 9
.26
.39
.79
.3 9
.79
.7 9
.7 9
.2 6
.35
.3 5
.45
.5 9
.68
.45
.6 5
.99
1.19
.45
. 7 5
.75
.7 5
.8 8
.9 8
74LS107
74LS109
74LS112
74LS122
74LS123
74LS125
74LS126
74LS132
74LS136
74LS138
74LS139
74LS145
74LS148
74LS151
74LS153
74LS155
74 LS156
74LS157
74LS158
74LS160
74LS161
74LS162
74LS163
74 LS164
74LS165
74LS166
74LS170
74LS173
74 LS174
74 LS175
74LS181
74LS190
74LS191
74LS192
74LS193
74LS194
74LS195
74LS196
74LS197
74LS221
74LS240
74LS241
74LS242
74LS243
.45
.45
.4 9
.55
1.19
1 .35
.89
.79
.59
.8 9
.89
1.25
1 .49
.79
.79
1 .19
.99
.9 9
.7 5
.9 8
1 .15
.98
.9 8
1.19
.8 9
2.49
1.99
.89
.99
.99
2 .20
1.15
1.15
.98
.9 8
1.15
.9 5
.8 9
.8 9
1.49
1.95
1 .90
1 .95
1.95
74 LS244
74LS245
74 LS247
74LS248
74LS249
74LS251
74LS253
74LS257
74LS258
74LS259
74LS260
74LS261
74LS266
74LS273
74LS275
74LS279
74 LS283
74LS290
74LS293
74LS295
74 LS298
74 LS3 24
74 LS347
74 LS348
74LS352
74LS353
74LS363
74LS365
74LS366
74LS367
74LS368
74LS373
74LS374
74LS375
74 LS377
74LS385
74LS386
74LS390
74LS393
74LS395
74LS399
74 LS424
74LS668
74LS670
1.95
4.95
1 .10
1.10
1 .69
1 .79
.98
.98
.98
2.95
.69
2.49
.5 9
1.75
4 .40
.59
1. 10
1.29
1.95
1.10
1.29
1.75
1.95
1.95
1 .65
1 .65
1.49
.9 9
.9 9
.73
. 73
2.75
2.75
.69
1.95
1.95
.65
1 .95
1.95
1.70
2 .95
2.95
1.75
2.29
FOR THE FINEST I N MICROPROCESSOR SUPPORT I.C.'S
MAI L ORDERS SHOULD BE SENT TO:
P.O. Box 21432 Seatt le, Washington 981 11
Telephone Orders & Inquiries (206) 453-0792
Mi ni mum Order $10.00 Add $3.00 Shipping
HANLEY ENGINEERING
RETAIL STORE
1644 116th NORTHEAST
BELLEVUE, WASHINGTON 98005

c
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CIRCLE 61 ON FREE INFORMATION CARD
85
CIRCLE 19 ON FREE INFORMATION CARD
1...
'.25
'.25
,...
' .S9
...
1.15
10.95
10."
1.69
10.95
S."
s,"
7.50
7. 50
. 79
.19
14C221
UC240
74<:244
14Cn3
14C]J.4
14C901
""'"
74C911
74C912
74C915
7"C917
7"C922
14Cm
74C925
"em
""" 100J7
LM7Q2H . 79
LM70lC N .19
LM709N .49
LM110N .19
LM711N .19
LM723N .69
LM7]JN /H 1.00
l M739N 1.19
LM74ICN .35
MC1741SCG 3.00
LM7"7N/ H . 79
l M741N/ H .59
LMI014N 2.15
LM1310N l.95
LMI 45&C N .59
LMl 4&lN 1.25
LMI419N 1.25
LMI496N l.95
LMI556V 1.75
LMl lOON 2.95
LMl an N-9 3.25
LMII19N 3.20
- LMl t96N 1.75
LM2O:I2T 1.049
LM2In p 2.05
LM2I78P 2.25
LM2I96P l 2.25
LM3119N 2.95
LM39IXl N .69
1.25
LMJ9O'i N U S
LM3914N US
LM3915N ] .95
LMJ916N 3.95
RC4136N 1.25
RC415I NB ] .95
RC41MTK 5.95
RC4195T K 5.49
KB442t 4.25
KB4429 5.95
LM4500A 3.25
iCU03I B 4.9$
LM13010N 1.29
LMI J600N 1.49
75ll1 N 1.95
7S450N .19
7S451CN .39
1'S492 .19
LINEAR
LM340T-5 1.25
LM340T-12 1.25
LM340T-15 1. 25
l-M341P-S .75
LM341P-12 .75
LM341P.lS .75
LM)42P-$ .69
LM342P-12 .69
LM342P-15 .69
LMJ4I N 1.25
LMl50K 5.75
LF35 1N .60
LFlSl N 1.00
LF 355N 1.10
LF356N 1.10
LM358N 1.OCJ
LM359N 1.19
LM31QN 4.49
LM37]N 3.2$
LMJ nN 2.95
LMlION 1.25
LMJl IN 1.95
LMlI2 N 1.19
LMJ&4N 1.95
LMJI6N -J 1.29
LM3I7N 1.45
LM3I9N 1.35
LM392N .69
LF JMN ".00
LMJ99H 5.(0
TL494CN 4.49
TL 496CP 1.75
NE510A 6.00
NE529A 4.95
NES31H 3.95
NE536H 6.00
NE540H 6.00
NES44N 4.95
NE550A 1.30
NE!65V .39
LM556N .99
Na64N
LM565N 1.2S
LM566CN 1.95
LM567V 1.2$
NE510N ".9$
74C
74C95 U9
74CI07 1.19
74C151 2.95
74C154 ].95
74ClS7 2.25
74CI60 1.69
74C161 l.60
1"C162 1.49
14C16] l.69
74CI64 1.59
74Cln 1.39
74Cl74 1.39
74CITS 1.39
14CI92 1.69
14CI93 1.69
74CI95 1.59

Funct ton Pr ice
CM OS Preci sion Tlm.r 14.95
Stopwatch Ch ip , XT L 22.95
3lh Digit AI D (LCD Dri ve) 16.95
IC, Circuit Boa rd , Di spl ay 34.95
J lh Digit AI D ( LED Dri ve) 15.95
IC, c tr e ut t Boar d, Displ ay 2t.95
310\ Di git AI D LCD Dis. HLD. 11.95
JII'1: Digi t AI D LE O Dis. HLD. 11.95
Lo w Batte ry Volt tne tcat or 2.25
CMOS LED 5t o pwat c h/Tl mer 12.95
St o pwat c h Ch ip, XT L 19.95
To ne Ge nerat o r 5.15
Tone Ge nerat o r Chip, XT L 9.95
Oscilla to r Controller 6.50
Counter Chi p, XTL 11.10
seven Decade Count er 17.95
Cl oc k Gen er ator 3.9$
4 Fu nc . CMO S St o pw atch CKT 13.95
4 Func. Stopwa t ch Ch ip, XT L 19.9$
I- Dig it Unlv . Counter C.A. 32.00
I- Ol gl t F reQ. Counter C. A. 26.95
I- Olglt FreQ. Co u nter C.C. 21.95
4-0 1glt LEO Up/Down Count e r 12.95
I- Ol glt Unlv . LED Dri ve 10.95
LCD 4.\'1: DigIt Up Counter DRI 11.25
I Olglt Unl v. Counter 31.95
5 F unct io n Co unte r Ch ip , XT L 1".95
CMOS Bi n Prog. Time r/ Cou nt e r 4.95
CMOS Dl vld e-bY' 256 RC TImer 2.05
CMOS BCD Pr og. Timer / Counter 6.00
CM05 BCD Prog . Ti mer/C ounte r 5.25
CMOS 5S5Timer (I pin ) 1.45
CMOS 556 Timer (I " p in ) 2.20
CMOS Op Amp Comparator SMV 2. 25
CM OS oe Amp Ext. cmvr. 5MV 2.95
CM OS Cu,1 Op Amp Co mp o SMV 3.95
CM05 Tr l oe Am p Com po IOMV 5.35
CMOS Qu ad on Amp Ca m p. IOMV 7.50
CMOS Quad Op Am p Camp. 10MV 1.50


Vo lt Ref/Ind ica t or 2.50
Vo lt Ref/ In d iCAt or 2.50
."
."
."
."
."
."
."
."
1."
1."
.19
.19
1...
.91
6."
I. "
I."
LHCX2CN 6.15
LMIOCLH 4.50
LMll CL H 4.75
LHQ01l)-OH 6.05
TL071CP .19
TL07 2CP 1.39
TL 014CN 2.49
LHQCI2CD 3:5.10
T LOI2CP 1.19
T LOI4CN 2.19
LH()()94CC 36.10
LMlOOH .99
LMlOIC N/ H . 35
LM302H 1.95
LM304H 1.95
LMJ05H .99
LM301CN/ H .45
LMlO8CN/H 1.00
LMJ09H 1.95
LMJ09K 1.2S
l M310CN 1.75
LM3I1H/ CN .90
LMJl 2H 2.49
LM311MP 1.15
LM317T 1.75
LMJ17K 3.95
LMllI CN/ H 1.95
LM319N 1.95
LM320K-5 1.35
LM320K12 1.15
LM320K-IS 1.3:5
LM320T-5 1.25
LM320T 12 1.25
LM320T-15 1.25
LM323K-5 5.95
LMJ24N .99
LM]29 0 Z .65
LM331N U 5
LM334Z 1..30
LM.1l5Z 1.40
LM336Z 1.15
LM3J7T 1.95
l M331MP 1.15
LM33IK 6.95
LM3J9N .99
LM340K-5 1.35
LMJ40K12 1.35
LM340K-15 1.35
P. rt No.
7045IP I
7045EV/Klt -
7106CP L
l 106EV/ Klt -
7101CPL
7107EV/Klt -
7U6CPL
1111CP L
12011DR
""" PC
12CI5EV/KIt
1205CJ PE
7206CEV/ Kl t
1207A IP D
7201AEV/Klt
72011P I
7209IPA
n 151PG
721SEV/ Klt
n l ' A IJ I
7216C IJ I
72160 1P I
72l1 1J I
72IIC IJI
7224IPL
7Z26A IJ L
7226AEV/Klt-
7240IJ E
7242IJ A
1250IJE
1260IJ E
7565IPA
7WtlPO
1'611BCPA
7fi12BCPA
1621BCPA
163ICCP E
7641CCP O
7'642CCP D
7<6llCPA
8OJBCCPO
l104&CCP E

B2I1CPA
1212CPA
14COO
74C02
74C04
74CDI
7"CI0
14CI 4
14C20
74C30
1"C42
14C4a
74C73
14C74
74CIS
74C16
UC 19
74C9O
14C9]
CAPACITOR CORNER
50 VOLT C ERAMIC DISC CAPACITORS
Value 1-9 10-99 100+ I 1-9 10-99 100+
:=r:F
47 p f .01.06 .05 .OI,u. F .01 .06 .05
100 p f .01 .06 .05 .00000 F .09 .07 .06
:r.u.
1
# F
100 VO LT MYLAR FILM CAPACITORS
.OOl mf .12 . 10 .07 1 .0000 f .n.ll .OI
.0000mf .12 . 10 .07 .047mf .21 . 17 .n
.0047mf .12 .10 .07 . Imf .27.23 . 17
,Olmf . 12 . 10 .07 .22m f .33 .27 . 22
+20% DIPPED TANTALUMS (SoIKl I CAPACITORS
.1/35V .39.34 .29 1 1.5IJ5V .41 .J1 .29

.33IJ5V .:19 .34 .29 ".7/2SV .63.56.45
.471J5V .39.)4 .29 6.lrnV .19 .69 .55
.6I / 35V .39.34 .29 15/25l,,' 1. 39 U S .95
1.0/35V .39 .34 .29 22/5V .19 .69 .55
MINI . ALUMINUM ELECTROLYTIC CAPACITORS
Axial J.99 IClO-499 500+ R.dial 1-99 lClO-499 500+
.47/5IJV .16 . 14 .10 .41/lSV . 15.13 . 12
1.0/5IJV .19 . 16 .12 .41/S/N . 16 .14 . 13
] .3/SOV . 17 . 15.11 1.O/16V .I S .lJ .12
4.7/25V .11 . 15 .11 1.0125V .16 .14 . 1J
lO/25V . 11 . 15 . 11 1.0/SOV .17 .15 . 14
lO/50V .19 .16 .12 4. 1/ 16v .15 .13 .12
12./25V .19 .16 .12 4.7/2SV . 16 .14 .n
= 10'1'::
:1: :1:
:ft :1:
22O/50V .49 .45 ."l l00/25V . 25 . 2] .21
=i'v
22OOI16V .M . 19 .69 410125v .35 .31 .27
Vacuum Vise
Vacu um-based light -duty
vise for small component
and anembli es. ADS con-
st ruction. 1'1.1" j. ws, t Y."
trawl. Can be permane nt
Iy
VV-1... .. $3.49
Wire Wrapping
KitWK-2
Cont. ins WSU30 wn p tool, 50
fnt of KYNr 30 AWG wM I
, wirt , !lOpi' ct. uchpruuipptd
wir. in 1", 2" 3" and" Hlt ngths.
.tripp td 1" both ends.
..ftDrL :.
RL2 .. $. 39 ea. or 3/$1 .00
DISPLAY LEOS c. c. - Common C.thod.
Po luity Ht Price Type Po lar ity Ht Price
C. A.- red .270 2.95 DL G501 c .Ac-ar een .500 1.25
5x l D.M.-red . 300 ".95 DUO" c. c.c-reo .300 1.25
C.C.-red . 12S .25 OL 107 C.A.- re d .300 1.2$
C.A.-gree n .300 1.25 OL72I C. C.-red .500 1.049
C.C .-green . )Xl 1.25 OLl 41 C. A. - red .600 1.25
C. A.- red .300 .75 0l,.746 C.A .-red t I .630 1.49
C.A.- red .300 .75 OL 741 C. A.-red .600 1.49
C.C.- red .300 1.25 OL750 C.C.- red .600 1.49
C. A.-ye llo w . XlCI .49 OL0&41 C. A. - orilnge .100 1.49
C. C.-yetlow .300 .99 m. osse C. C.-or,nge .800 U '
C. A.-orilnge .300 ."9 OL3]B C.C.-red .110 .35
C.A .-oril n,e :t 1 .300 .99 FN 0 351 C.C. :t 1 .351 .99
c .c.e-c rena e .300 .99 FN 0 359 C.C. .351 .75
C. A.-oran ge .400 .99 C.C. (F ND500) .500 .99
C. A. - orange-OO .560 .99 FN0507 C. A. (F ND510) .500 .99
C.A.-or, nge 1 1 .560 .99 H0 5P-3401 C. A.- red .100
C.C .-ora nge- c O . 560 .99 HOSP]4()3 C.C.-red .100 1.50
C. C.-orlinge 1 1 .560 .99 scm-71'S1 C.A.,R .H . D.--red .0 0 1.25
C. A.- o ra nge .560 .99 5082-7160 C. C.,R. H. O.--red .00 1.75
C.A.-re d - DO .560 .99 5012-7300 4x7 '9 1. di g. RHO .600 22.00
C.C.-red :t I .560 .99 5O&2-7J02 <Ix7sgl. d ig. LHD .600 22.00
C.C.-red .560.99 5012-7304 Ove rn ge.char. (:t I) .6OO 19.95
C.C .-orange .300 1.25 4N21 Photo x srstc r o etc- tsc t. .99
C.A.-orange . 300 1.25 LIT-I Ph ot o x su t o r Opto- I$01. .69
C. C.-gree n .500 1.25 MOC3010 Opt icilily 1$OI.Tr iao:Or ive r 1.2S
C.A. - Common Anod e
10 Ohm 12 Oh m 15 Oh m 11 Oh m 22 Ohm
$ 1.95 ASST.! S e 21 Oh m 13 Oh m 39 Oh m "7 Oh m 56 Ohm SOpcs _
61 Ohm 12 Oh m 100Ohm 120Ohm 150 Oh m
$1.95
ASST. 2 Sea. 180 Ohm 220 Oh m 270 Ohm 3JOOh m)gOOhm SOpcs.
410 Ohm 560 Ohm 6&0 Ohm 120 Oh m l K
$1.95 ASST. 3 S e. UK 1.5K U K 2.2K 2.1K SOpcs.
3.3K 3.9K ".lK 5.6K U K
$1.95
ASST. 4 S e . 1.2K 10K 12K l SK 11K 50 pes.
22K 27K 33K "K UK
$1.95 ASST. 5 Sea. SlK 61K 12K I.,K 120K 50pcs.
150K lOOK 220K ' 10K 3JOK
$1.95
ASST. 6 5. 390K . IOK S60K 6IOK I20K 50 pcs.
1M 1.2M l.5 M I. I M 2.2M
$1.95
ASST . 7 S . a. 2.7M ].3M 3.9M 4.7M 5.6M 50pcs.
ASST.8R Includes Resistor Assls. 17 (350pes.) $10.95 ea,
.,
LOW PROFILE SOLDERTAIL
(TIN) SOCKETS STANDARD (TIN)
,."
25... SO-l.,
,."
"...
SO-l.,
I p in LP . 17 . 16 . IS
14 pin ST .27 .25
."
14 p in LP .20 .is .11
16 p in ST . . 27 . 25
16 p in LP .n .n . 20
11 p in 5T .35 .32 . 11 pi n LP
."
.21 .27
24 pi n ST ... ...
."
20 p in LP .J< .32 .
21 p in 5 T .91 .90 .11
22 p in LP .37 .36 .35
36 p in ST
L" 1.26 1.15 24 p in LP . 31 .37 .36
40 p in ST 1.S9 1.45 I.
21 p in LP ... .44
."
36 pi n LP .5O .99 .SO
WIRE WRAP SOCKETS
40 p in LP .63 .62 .61
(GOLD) LEVEL #3
SOL D E R TAI L (GOLD)
1-"
,.... so-,.,
STANDARD I p! nWW .S9 ...
."
10 p in WW .iI .63 .SO
1," 25'" SO-I., 14 p inWW .19 . 73 .67
I pin SG
."
.35 .31 16 p inWW
."
. 77 . 70
1" p in SG
."
...
-"
IlplnWW .91 .90 .11
16 pi n SG ...
."
... 20 pi n WW 1.19 1.01 ...
11 p in SG .S! S] ... 22 p in WW 1... 1.35 1.23
24 p i n SG . 19
." ."
l<'pl nWW
1." 1. 26 1.1"
28 pin 5G 1.10 1." .90 2S p in WW 1... 1.5] 1.31
36p in SG U S 1.40 1.26 J6pln WW 2.19 1.91 1. 19
40 p In SG I." 1.59 1.45 40 p in WW
,." '.09 1.19
Ty..
MANI
MAN 2
MANJ
MA N 52
MA N 54
MAN 71
MAN 72
MAN 74
MAN U
MAN'"
MAN 3620
MAN 3630
MAN 3640
MAN 04610
MA N 6610
MAN (6

MAN 6650
MAN 6660
MAN 6710
MAN 67!lO
MAN 6710
Dl 0 304
DLOlO7
DL GSOO
$10.00 Mi n. Ord ar - U.s . Fund s Only SPK Sh eets _ 25t
Cali f . Resid ents Add 6%s.l el Tax S.nd for yo u r
Po st . ge-Add 5%plu s S1InlUr .n FR EE 1981 JA MECO CATALOG
---
J
PHONE
ameco
ORDERS
WELCOME
(415) 5928097
MAIL ORDER ELECTRONICS - WORLDWIDE
1355 SHOREWAY ROAD, BELMONT, CA 940 0 2
8/81 PRICES SUBJECT TO CHANGE
SOCKETS RECEPTACLES
Test 1"1: L Sockets Q=
ZERO INSERTION FORCE
* Nic kel Bor on PI. t in; * Nic kel Boron PI.tin g
G.F . PSF Plas ti c Bod y * G.F. PSF Pl as ti c Body
* F or testin g IC' s * Wire Wr ap ContM:ts
Par t No. Pins IP. rtNo . Pr ice fi!!! Pric e I Pin s
214-3339 I" pin 5.95 2223343 2! pin 9.95 214-3592 14 p in 9.15 2223596 22 p in 12.95
216-]340 16 p in 6."9 22(-3344 24 p in 9.15 216-3593 16 p in 9.95 224-3597 204 pin 12.75
211-3341 II pi n 7.95 2213345 28 p in 11.95 218-3!fl4 11 pi n 10-95 2213S9a 28 p i n 13.95
20 p in 1.95 40 pin 12.95 220-3595 20 pi n 11.95 204G-3599 40 pi n 15.95
1/4 WATT RESISTOR ASSORTMENTS - 5%

DIPIlC INSERTION TOOL
WITH PIN STRAIGHTENER
Ii I
.' jll ll
1lIl.!!llI:Im.mlllll lll:lJ3 Ell:lII
Inu rt . both 14 and 18 pi n packages.
N arr ow p r of ile per mit, w o r k. on etcs
IV . pac e d it em P in streigh tener b ui lt
i nto handl e.

INS' 41lS 14 16 p," .......... . 13 ,49
MO$1416 1416 pn CMOS IoIIft 7.95
MOS2428 2418 ponCMOSloll fe ... _.. 7.95
MOS-40 36<COpmC'ol OS ..,f , . . 7.95
-
7400
I I
SNl 400N . 25 SN74 nN
."
S N74156N . 19
SN7401N . 20 SN741lN .35 S N 741S7N .69
SN 7402N . 25 S N7414N . 35 S N74160N .19
S N740JN . 25 SN1475N ... S N74161N .19
S N7404N . 25 S N7. " N . 35 SN74162N
."
SN 70405N
."
S N 747'9N s.., S N74163 N .19
SN7406N .35 S N7410N . 50 S N74164N .19
SNl407N . 35 SN7412N .91 S N741liSN
."
SN1401 N
."
SN1W N ... SNl4166N 1. 25
SN7409N
."
S N741SN .19 S N74167N '.19
SN7410N .25 SN14I5N .35 S N74170N 1...
S N7411N
."
SN7419N 1.1. SN141nN ....
SN1412N .35 SN749QN
."
S N74173N
1."
SN 7413N .40 SN149lN .S9 SN7417 4N .91
SN 74HN .ss SN7<t92N
."
SN 14175N .19
SN 7416N
."
SN749JN
."
S N74176N .19
SN 1411N
."
S Nl 494N ... S N74177N .19
SN 7420N . 25 SN1495N .iI S N14179N
1."
SN 742}N
."
S N74!Hi N
."
SN14llON .19
SN1U 2N .ss SN'49 1N 3." S N74111N ' .25
SN142JN
."
SN741CON 1... S N741I2 N .19
SN 1425N
."
SN74104 19 SN74114 N ,...
SN1426N
."
SN 74 105 A' S N741I5N ,...
SN7427N .25 S N14107N .35 SN74190N 1.25
SN7421N
."
S N14109N
."
SN741 91N 1.25
SN74JQN .25 S N 74116N I." S N74192N .19
S N7432N
."
SN74 J21N
."
SN741 9,JN .19
SN 74J1N .25 SN14122N .S9 S N14194N
."
SN14l1 N .40 SN7412JN .S9 S N741%N ...
SN709N .25 S N14125N ... SN74196N
."
SNl4-40N . 20 SN14126N ... SNl 4191N .19
SN l4<'IN .19 SN 14U2N
."
SN14l 9lN 1...
SNl 4<' 2N .S9 5N14116N
."
5 N14199N 1...
5 Nl 4<' 3N 1. 10 5 Nl 4141N .91 SN 1422IN 1.25
SNl4-44N 1.10 5 Nl 4142N 3.25 5N7425IN .91
5N 74<'SN .19 5 N74143N 3." 5N7421'6N
1."
5N7446N .19 5 N14144N 3... 5N74219N
."
SN7447N ... 5N74145N
."
5 N742SJN
1."
5N 144&N .19 5 N74147N 1... 5 N74214N 3."
5 N1450N . 20 5N741UN
I. " SN7428!N 3."
5N 1451N . 20 5N 1415ON 1.25 5N74J65N ...
5N745JN .20 5N74151N ... SN 7Q66N ...
5N74504 N . 20 5 N74152N ... 5N7 4367N ...
5N7459A .25 SN741S3N .19 5N74361N ...
5N 746QN .20 5 N74154N 1.25 S N74390N 1.49
5N 741QN
."
5 N741SSN . 19 5 N743UN
1."
74LSOJ
."
74LS
74LSI92 1.15
741..501
."
741.. 5193 1.15
74L502
."
14L5 92
."
74L5194 1.15
74L503
."
74L593
."
741.. 5 195 1.15
741..504 .35 741..595 .91 741.. 5 191 1.19
741..505 .35 741..S96 1.15 141.. 5221 1.19

."
14LSI01
."
141..52-40 1...
14L509 .35 741.. S109
."
14LS2'41 1...
14L5 IO
."
74LSl12
."
1...
741..5 11
."
74LS1I3
."
141..52-43 1...
141..5 12 . 35 741..5114
."
741.. 5244 1...
74L5 13 .S9 741..5122 .19 741.. 5145 , .ss
741..514 .91 141..5123 1.25 741..5247 1.19
741..5 15 . 35 741..5 125 .19 741.. S2q 1.19
741.. 520
."
741..5 126 .S9 741.. 5249 1.19
141..521 . 35 141..5132 .91 741.. 5251 1...
741.. 522 .35 741..S133 .19 141..S2S3 .91
741..526 . 35 141.. Sll6 ... 74LS257
." 141.. 52 7 35 141..5138 .19 741..S25& ...
741.. 5 21 35 741..5139 .19 14L526Q ...
14L53O
."
741.. S151 .19 74L526Ei ...
74LS32 .35 141..5153 .19 741.. 5273 1.95
14LS3J .S9 741..5154
1." 74L5279
." 74L5 37 ... 741..5155 1.19 74LS2IJ 1.09
141..538
."
14L5156 1.19 74L529O
." . 35 14L5 157 .19 14LS293 .91
74L542 .19 74L 5 15& .91 74LS29I 1.25
14L54 7 .19 741.. S16O L IS 74LS352
I."
U LS4& 1.15 741..5161 1.15 74LSJ5J
I."
14L549 1.15 74L51 62 1.15 141.. 5365
." J.C LSSI
."
74L5 163 1.15 741.. 5366
." 74LSS4
."
14LS164 1.25 14L5367
." 741..555 .zs 74LS15 1.25 14L5361
." 74l,.5 73 .es 741.. 5 161 1.19 141.. 5373
1."
741..574 ... 74LS169 1.19 741 5374 1...
74L5 75 . 59 74L517O 2.49 74L5]7$ .19
74L576
."
741..5 113
1." 14l S386 ...
14l S78
."
74L5 11" .91 74L539] 2.49
1"LsaJ .19 7"l SI75 .91 74L5399 2.4'
14L585 1.25 7"LSlll 2.95 7" LSli1O 2."
74LS16
."
14L5190 1.25 I I LS95 1...
141..590 .S9 14L 5 19l 1.25 I I LS97 1."
"500
.50
748
14S2'43 3.25
"502 . 50 745244 3.25
7"503 . 50 745 124
2." 1"5251 1.45
1"504 .ss 7"5 133 .S9 1452S3 1.45
145m .S9 745134 .ss 745251 1.35
74503 . 50 745135 1.19 7"5 258 1.35
74509 .50 1"5136 1.75 145260
."
7"5 10 .50 745131 1.35 7452!O 2.95
7"511 . 50 145139 1.35 745287 ....
74515 .50 145140 1.15 74528& ....
7"520 . 50 145 151 1.35 745373
3."
74522 .50 1.35 14537" 3."
145] 0 .50 145151 1.35 145311 ....
14532 .S9 14515& 1.35 145" 71 19.95
14531
."
145160
1." 1454n 19.95
1"540 .S9 145m 1.S9 145"13 19.95
74551
.""
145175 1.59 745474 21.95
"...
.50 1"5111 .... 145"75 21.95
14565 .50 145194
I." 7"5510 7.95
14514
."
7"5195 1." 145571
7."
14586 . 19 145 196 3... 74S5n 19.95
145112 19 145240 ,... 745513 19.95
145 113 . 19 145241 ,... 145940 ]. 15
14S114 . 19 1"52-42 3.25 145941 3.15
CAlOI0H 1.01
CA-L1NEAR
CA3089N ].7 5
CAJ013H 2.15
CA3Q60N 3.25
CA3096N 3."
CA3Q2]H 3.25 CA313QH 1. 39
CA30J5H ,...
CA300QH 1.25
CA3 140H 1.25
CAlOIIN ,..,
CA30J9 H 1.35
CA3OI2N ,.., CA3160H 1.25
CA3046N I. CA30IJN UO CA340I N . 59
CA.3C69N 3.25 CA3al6N
."
CA3600N 3.50
CD400l .39 C04tm 2."9
C04OO1
."
CD-CMOS CD4!06
."
CD4Ol2
."
.91
CD4006 1.19 C04041 1.49 CD4 !01 3...
C04001 .25 C 04042 .91 C04510
1."
CD4 009
."
C0404] .19 CD4511
I."
CD4010
."
C """' .19 CD4512 1.49
CD4011
."
C D4",
' .19 CDC514 3...
CD4012 . 25 C04 0H 2.50 CD4515 2...
C04013
."
CD4", 1.35 C04 516 1.49
C 04 014
1." C D4049
."
C045 11 1.19
C040 15 1.19 CD4 050
."
C04 519 .19
CD40 16 .S9 CD4051 1.19 CD4 920
I."
C D4017 1.19 CD4 1l52 1.19 CD4 '" 1.19
en
C04018 . 91 C D4QIJ 1.19 CD4 52& 1.19
0
C04 019
."
CD4 0S6 ,... CD4529 1.95
CD4020 1.19 CD4059 g. " C04S4] '.19
Z C04021 1." C D4050 1.49 C04562 11.95
0
CD4022 1.19 CD4l>6 .19 CD4",
' . 19
C D4023
."
C D4...
."
CD4!iIJ
2."
a:
CD4024 . 19 ... CD4504
." I- C","" .23 CD4010 .S9 CD4723
1."
0 CD4<l26 ,... CD4071
."
CD4 rn
1."
W CD4027 .6' CD4 0n
."
MCI4409 14.95
....I COOl1ll .19 CDC073
."
MCl44 10 14.95
W CD402!l 1.49 C04015
."
MCI4411 1".95
I CD4030
."
C D4016
1." MCI4412 11.95
0 CD40J4 3." C04071 .S9 MCI4419 ....
0
C D40J9 .91 C 04 ttl
."
MCI4433 13.95
C D404' 1.49 C04Q82
."
MCI4531 2."9
C04093 .91 MC14S41 1...
a:
86
>
c
G)
c
en
-f
.....
(0
00
.....
$3 .95
$4 .95
$5 .95
$6 .9 15
$3.26
$3 .95-
Price
f " eM ","11ct. t h .
,,_I, ,._." IIft , .
"", -,lMrly,..tAC ...
DC",Jklli...
Output
DSubmini.tur. Plug 52.9 5
DSubminl.tur . Socket $3. 50
Cov er for DB25P/S $1 .75
P.C. Ed.. (22/44 Pin] $2.95
8NC PluQ _.. _ _ $1.79
BNC J ac:k $3.79
UHF Ada pte r $ .49
UHF P.n.1 R-ep 5 1. 29
UHF Ad.pt.r $ 1. 60
UHF Plug $1 .6 0
eNC PluQ . $1.79
BNC Bu lkh ead Recp . . $ 1.29
Input
CONNECTORS
FULL 8-BIT
LATCHEO OUTPUT
19-KEY KEYeOARD
JE610 ASCII
Encoded Keyboard Kit

Exp and your 4 K T RS-SOSyst em t o 16 K.

Kit com ecmplete wi t h :
*8 . MM5 290 (UPD416/4116116K Dyn. R.m.t ' NSI
*Docum.nt.tion for Con vers ion
TRS-16K2 -150NS $39.95
TRS-16K4 - 250NS _. . , $29.95
TRS-SO
16K Conversion Kit
P.rt No .
AC 25 0
AC 500
AC1 00 0
AC17QO
OV 92 00
OC900
POWER CORD SALE
842-812
:::jD , ' 9 10-99

_h h __ _"' _'"
.35 .30
362-812

,--, .. _-_.,-,!II
1-9 10- 99 100
.3. .3 5 .3 0
473-882
, _ _no. ___. , __ ' -9 l <e9 9 100
.45 .39 .35
468-828
"'
1-9 10-9 9 100
. 4 9 .4. .3 9
435-802
.,-r .. -____,
,-.
' \ \9
100
.59 .4 9
AC and DC Wall Transformers
JE600
Hexadecimal Encoder Kit
_ :- ---
----)
' QT4IS
_ OT1
_ GTt U
OT11S ...-------=-==-=-=-....;....;-----t
_ GTU'
. OT.'
Quick Test
Sockets
lit Bus Strips
- ,-
- --
OUII l r :!'II i-i1i
GU 7S sr- u ,. s i n
GT..a U ' u - 11 s"'iii
an u )I' III sui
an u u U S I n
allU 24 2 1- :M I
O112S l r l ' sI n
aHis 1 1- 11 sui
O1 n 1 ) l r 14 l Ilt
$p: Sh..ts - 25C
Se nd 5211'Postage for your
FREE 1881 JAMECO CATALOG
$ 1.75
$14.15
$12.00
$3.50
$ 4.15
$ 1.75 21411'
214111
2110'
2(201
2(101
TELEPHONE/ KEYBOARD CHIPS--
AV S.. IOO ,.". .... 1111110 " T, IUho"e OIlier 14.15
AY+t2QO Re lle rt ory OJ.I . , 14
... CM OS Cloc k a.M. I t O'
AY \ -n1l KiY DOI ' Cl ["cod (II k .Y I) 11
HOO Mllo-\ K. y bOl rd ["coCl.' {M ki'YtI 1.95
14Ctn KiY Do . rd I:"COCl. ' ( 16 k.ys) \."
K.yDO. t Cl E"COCl.r 120 k. YI ) \ . l'S
MMUltQN Puln Bullon Pll ise 01.1. . 1."
MM\MtN "'l44-KiY SI.III Ki'Yb o. , Cl ["COli.. . .ts
OSllQ2K;N
OSOQXCN
lNSl nlN-1
INSM1N
MM5oI}67N
hIIMSlIHN
CO PC2N
...
Swipl
411601
ELECTRONICS
.3'" 22(110}
n/a nla
_' " 4612""
.S'" 46(230)
.6" 94(470}
.3" 94(4701
Jameco
e.tlt !5r.poi.nt
C I T..-miftille
EXPERIMENTOR
SOCKETS
6.0" 2.4"
3.'" 2.1"
6.0" 2.1"
3.6" 2.4"
1.1'" 2.1"
PHONE
ORDERS
WELCOME
(415) 592-8097
MAIL ORDER ELECTRONICS - WORLDWIDE
1355 SHOREWAY ROAD, BELMONT , CA 94002
PRICES SUBJECT TO CHANGE
Width
6.0" 1.0"
C' U
"'8111" lIl1t /01I11I1I1
l"t. rrllllt CO"lrol
81-01rKtlO""l Bill 0.1 .
Clock a."I.ItOt / Or I t
Bill Orl ... .
Syst Co"t.oI1et jlllll 0.1 ....
Syll CoM.olln
I/O I:"INI "OI' 10.4154<111
Al y"'C;h.O " O<oI S Co m m_ El......"t
Pi'ot. Comm. I/O (U SA RT)
Pr ot. I" t r Tlm.II.
Pro, . "",.lllh ll/O (PPII
Pr ot. OM A CO"Uol
Pro.. t "t. rr ll ll t Co"I' Ol
P.ot . C AT COM ,olln
Pr ot. K.yDa..d/O IWtI"y I" t l"c.e
Oc; 1t! BIIS RK. l...,
5.YII.mTI,"I",I_"t
I-B 't BIOI .ecUO".1 Rec. I .
".'t" OlrKtIo" ,,1 Ree. I .
".11 BIDI'lello" .l Aec.. I ,
GLOBAL
SPECIALTIES
$ 10. 00 Min. Ord er - U.S. Funds On ly
C.lif. R.sidents Add 6" Sa l. s T. x
Post.ge - Ad d 5"plusS1 Insu r. nce
EX'35O
EX.saa
EX'J25
EX'300
EX"SG
EX'4I
8/81
---DATA ACa UISITION - - - ----l
AF IOO- ICN U"I... . u r Ac;t ltl F ilte. 1.,,, ' .S'S
"'''lJJ-ICJ T Olltl'l To" . Lo w p,,"F lit .. 19.
AI'U2-1CJ T Ol,lch To n. l.ow POllSFlit. . It .
L MJDlAM S"per (hi" 0 11Amp 1.00
'-""U4Z CO""."t Cll rrent Sou.ce l .lCl
LMU5 l T,mp'.UII.' T.,,"SOuu. 1.10
L nS"'" JI" ET 1"11111 00 A mll 1.10
L"JIIN 5 1," 111... Hold Amplt l".s J.ts
L"" ,"1i Te mll . COI'l'lIl. llTiIC. Aef . ( .i PII ,"IC") I ."
A OCOIO'LCN " B't AI D Co " ..e. t" . n LS8 1 4.1\
OACC*IILCN "Bit O'A CO" ""," to-Jr.4LI".I 2..:5
MICROPROCESSOR COMPONENTS
- 8080Al8080A SUPPORT DEVICES
The JE610 ASCII K.yboard Kit ca n b. Int.rfaced into
mo st any comput . r systam. Th e kit comes complet.
wit h an Indu st rtal gra d. keyb oard .witch aSMmb ly
(62 -key s). IC' s, sockets, ec nnector. e lect ro nic co mp o-

lP 10 mA fo r op.ra t lo n. Features: 60 k.ys ven . rate t he
126 ch ar ac t . rs, up per and tower cas. ASCi i set. Futl y
buff .r.d. Two. uMrd efln e keys pro vid ed f or cu st om
applica t ions. Cap s lock f or upp er ca. a-on ly a lph a ch ar ec -
t .rs. Utlll z. s a 23 76 (40 -pl n) encode r read only m. mor y
chip. Outputs di rectl y compatib le wi t h TTL/ DT L or
MOS tovlc .rray s. Easy Int .rfaclnv wlt h 'a 16 pl n dip or
l Spin edge co nnec t or. Size : 3)1,"H x 14 W' W x S""o
JE610/DTE-AK ... $124.95
JE610 Kit .. $ 79.95
K62 &2-K.y K.yboard ( K. yboard onl y} . . . $ 34.95
DTE-AK (en, on ly - 49.95
e
JE212 - Neg.tive 12VDC Ad .pt. r Bo. rd Kit
NEWI for JE 610 ASC II KEYBOARD KIT Kltl
Provi des -12VDC from incoming SV DC . . S!J.9S
,.......
o",m
""""
""""
0_
0'"""
"""" 0 ....
,...,.,
,."'"
0 '
0 .....
"""" 0 ....'
0"",,"
0..,"
""""
""""
D_
o.....
D" '" D.....
_Sri ght .300 ht . co mm. cath-
ode display
- Us. s MM53 14 c lo ck chip
-Switc h. s fo r ho urs, mi nutes
and hold mo des
_ Hrs.asi ly viawabl. to 20 ft .
- Sim ul at ed wa lnut ca..
- 115 VAC op .ratlon
-1 2 o r 24 hr, operatio n
e Incl . all components, cas e &.
wall transfo rme r
- Size: x 3 -1/S" x
BATIERY HOLDER
Holds 2 ea. Ccells
Al uminum Case
5" leads
$ .45 each
8 OHM SPEAKER
214" - 8 Ohm - .25 watt
$1.25ea. 2/$1.95 e 101$7.95eL
JOYSTICKS
I
5 K Lin r T.pe' Po ts $5.2 6
lOOK Lin..r T. ptlr Pots $4 .9 5
40 K (21 Vi deo Co ntroller in cu e $5.95
82721
'-
6-Digit
Clock Kit
'-'-
JS-5K
JS-l00K
JVC-40
JE701 $19.95

JE215 Adjustable
Dual Power Supply
General Descr ipt io n: The JE215 is a Dual Power
Supply with independent adjustablepositiveand nega-
tive out put vol tages. A separate adjustment f or each
of the supplies provides the user un limit ed a pplicat io ns
fo r Iecurrent voltage requi rements. The supply can
als o be used as a gen eral all-purpose va ria ble power
supply. FEATURES:
Adjustable revulated power suppli.s,
POL and n.v. 1.2 VOC t o 15 VOC.
- Pow.r Output (..ch supply):
5VDC lP 500 mA, 10V DC CIl750mA,
12V DC O 50 0mA. and
15VD C . 17 5m A.
- Two, 3ta rminal adj. IC r.vulators
with therma l ove rload pr otection ,
- H.." si nk ra vut.tor cooling
- LED " on" in dicator
- Print.d Soar d Constru c ti on
- 120VAC input
- Size: 3 112"w x 51 /16 "L x 2" H
102 -P2 0
102 -P22
10 2-P20
CLOCK MODULES
MA1023 . 7 " Low Co st Di gi t al LE D Cl oc k ModulI 8.95
MA1026 . 7" Dig. LED A larm Cl ock/Thar m o m at ar 18. 9 5
MA5036 .3 " L ow Co st D i gi t al L EO Cl oc k /Ti m ar 6.95
MA1002 . 5" L ED Display D ig . Clock & Xfor mar 9.95
TRANSFORMERS
X f o r mar f or MAl 023 Clock Modul ls 3.49
Xfo r ma r f or MA1 026 Clo ck Modul ls 3. 4 9
Xf or mar fo r MA5036 Cl ock Modules 3.49
EPROM Erasing Lamp
A0201
JE215Adj. Du.1PowerSupplyKit (. " hown) . . $24.95
(Pi ct u re not sho wn bu t siml l.r In construction t o abov. )
JE200 Reg. Pow .r Supply Kit (SV DC, 1 . mp ) .. $ 14 .95
JE 20S Ad . pt .r Brd.{to JE200) 15.19 &; :t:12V. 5 12. 95
JE210 V.r. Pwr . Spl y. Kit , 5 15VDC, to 1.5 .mp, $1 9 .95
Modules
12VDC
AUTOMOTIVE/
INSTRUMENT
CLOCK
AP PLICAT IONS:
In-dash 8utoclock,
Aft ar -market auto!
RV clocks
Aircraft-marina elks.
12 VD C opaf . In,t ru .
PorUbla/battary
po wa r.cJ instrumnu.
Fe. tur es: Bright 0.3" gree n displa y. Inter nal crystal nm e-
base . :t: 0. 5 Iee./day eccur, Auto. display br ight ness co nt rol
logic. Displ ay color filterable t o blue, blu e-green. gr een &
ye llow. Comp lete-just add swltches and lens.
MA1003 Module $16.95
Em
H-801159
Era 27 08. 2716, 170ZA. 52030, 52040. ere.
Er.... up to 4 chips within 20 minutes.
Maintai ns co nstant ex po... , . dist .nce of on . inch.
Sp4tci.' conductiv. f oa m lin. r . lim in. t sta t ic buildup.
Bui ltl n ..fetv loc k to pr .....nt UV ex po..,r .
CompKt - only 75/8" x 27/8" x 2"
Complet e with holding tr a y f or 4 ch ips.
UVS-11E $79.95
10/$3 .95

)f
BATTERY
c = = = c cells
Plastic case
. 9" leads
$ .49 eo. 10/$4.25
CIRCLE 19 ON FREE INFORMATION CARD
87
AVAILABLE
HAL.TRONIX
P.O. Dox 1101
Southgate, MI48195
0Mlf: '-SOy u . n o 00 'ti1LLt[ PO\",AIOUCf""
ON ITEMSWHlk[ AOOITlOMAl OI.u.G U U kIQ IJUn O
ONOkDl kSUSST"A.1l 520 00 I'UAH"IMClUOf:.... OOI11OI4

SHIPPIHG
IHFOf.MATlOH,
"1i!' /'
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__ MIIOlD C NOWVHO
_UXII
MANY, MANY OTHER KITS
MECHANICALLY inclined individuals desiring
ownership of Small Eleclronics Manufacluring
Business-without investment. Write: BUSINESS-
ES, 92-R , Brighton 11th, Brooklyn, NY 11235
LCD watch direct from factory. For catalog $1.00.
RELIANT ENGINEERING COMPANY, P.O. Box
33610, Sheungwan, Hong Kong
0
+ A .
mencon
Heart
Association
WE'RE FIGHTING FOR YOUR LIFE
BUSINESS OPPORTUNITIES
S.nd is. stomp 01' !l.A.S.. for Informculon OM fl y., on
HALT"OHI X products . To OlcMor by phon.,
CIRCLE 65 ON FREE INFORMATION CARD
ELECTRONIC KITS FROM HAL-TRONI X
2304 MHZ DOWN CONVERTERS. TUNES IN ON
CHANNELS 2 TO 7 ON YOUR OWN HOME T. V.
HAS FREQUENCY RANGE FROM 2000 MHZ TO
2500 MHZ. EASY TO CONSTRUCT AND COMES
COMPLETE WITH ALL PARTS INCLUDI NG A
DIE-CAST ALUM CASE AND COAX FITTINGS,
REQUIRE A VARIABLE POWERSUPPLY AND
ANTENNA (Antenna can be a dish t yp e
or coffee can t ype depending on the
signal strength in your ar ea . )
2304 MOD 1 (Bas ic Kit) $49.95
2304 MOD 2 (Basic / Pre-amp) $59.95
2304 MOD 3 (Hi-Gain Pre-amp) $69.95
POWER SUPPLY FOR EITHER MODEL ABOVEIS
AVAILABLE. COMES COMPLETE WITH ALL PARTS.
CASE, TRANSFORMER, ANTENNA SWITCHAND
CONNECTORS (Kil) $24.95
Assembled $34.95
Slotted Microwave AnlennaFor Above
Downverlers $39.95
... ..................
PREAMPLIFIERS .
HAL PA-19-1.5 mh210150mh2. t9dbgainoperales
on810 18volt s al 10ma. Complete unit $8.95.
HAL PA-1.4-3 mhz101.4ghz. 101012dbgainoper-
ates on 8 t o 18 volt s at lOrna. Complete unit $12.95.
(The above unitsareideaifor receivers, counters,etc.)
.. ........................... ...
16 LINE TOUCH TONE DECODER KI T
P,C , BOARD AND PARTS, ""
12 LINE TOUCH TONE DECODER KIT
P,C. BOARD AND PARTS """
16 LINE ENCODER KI T, COMPLETE
CASE, PAD AND COMPONENTS " , , $39,95
12 LINE ENCODER KIT, COMPLETE
CASE, PAD AND COMPONENTS , " ,$29,95
**** ************** ************
$700 per month earnings possible filling out
income tax forms at home or tax office during l ax
season. We show you how. Simple, quickl y
learned. Details mailed free . No salesmen. Hurry.
Big demand. FEDERATED TAX, 2015 Monlrose,
Chicago, IL 60618
CRT rebui lding machinery. $1000/$3000 weekly
possible when you own our patented picture tube
rebui lding equipment. Training provided. Phone
(312) 583-6565. Write: LAKESIDE, 4071 N. El-
ston, Chicago, IL 60618
GROUND floor opportunity with new companyl
Best marketing plan available in the Uniled
States today. A superior product line, better
incentives and excellent bonus programs com-
bined, offer the most success-orienled plan yet to
be announced. Write or call for free information.
ENHANCE MARKETING GROUP, (R) P.O. Box
26563, Salt Lake City , UT 84126 (801) 467-0473
JOIN software exchange, accumulate formidable
library inexpensively. Send $5.00, SOFTX, Box
8466, Miami Beach, FL 33139
:
..
,
,
:
i
"
"
>
,
Popular game devi ce uses
LEOs, t ransisto rs, and rc
t o give the eff ect of a brig ht
red ball spi nni ng around
numb e.rs. Uni t emi ts sound as
ball sprns and frnall y stops on
a number . rnct. an part s.
facepl ate & PC board.
WHEEL OF _
FORTUNE KIT <8
C380. $....

SOUND EFFECTS KIT I I"
COMPAC T USES THE POPULAR 1 17 ' .... 7 7 '1ol1P ..
TO CNEATE LOCOO4O TI VE, SIRE" . 5 "' 7 ' '1'77

R", ,,,, sv ,. m". .. II
KIT C4422 $12.95 -
ASSEMBLED C4423 $15 .85 O.
Project #29 - Cue System Mixer. 529.50.
Project #30 - Reverb System Mixer (does not
includ e springs). $34.50.
Project #31 - Preamp /I npu t Selector Modul e.
S19. 25.
Project "32 - Tone Cont rol Module. $19.25.
Project #33 - Noise Gate Module. 533. 35
Project #34 - "Budget Noi se Reduct i on System .
Uses Pre-Emphasi s/ De-Emphasis t echn ique. Wit h
comp lete ins tructio ns. $24/ channel, four channels f or
590. 00.
,.
TERMS : C.11 aoe l ax Allo ... 5' shipping : exc ess retun ded
c -c ecs cn ucr $15add $2 handl,ng VISA and Mast cr card or ders
tS25 min ) cal l l oll S) 5620636 , 201 I'lI S Incl ude street address f or
UPS
For PA or recording use, building your own
saves money while gi ving excellent performance
. . .and the MusiKils'" iisled beloware what you
need to get going.
These are the same kits described in Craig
Anderton's bests elling book , "Home Recording
lor Musicians" . These kils incl ude PC board,
quality components, swltches, and pots but DO
NOT i ncl ude instructions since the book
contains all necessary schematics, assembly ,
procedures, and applicalions .
" Home Recordin9 for Musicians". Covers
mi xing , miking, consol es, noi se reduct i on, how to
1
h
J8
h
mi xer, and :"
Project #13-15 - Bipolar ,, 15Vpower supply
: suitab le for powering t he kit s describ ed below. Up to
: 250 rnA per side; includ es t ransformer . $15.00.
Project #2 8 - Main Mi xer. You can mix down fr om
a four or eight track recorder wit h not hing more than
this mod ule. $25. 65.
CIRCLE 16 ON FREE INFORMATION CARD

BOX2355, OAKLAND AIRPORT, CA94614
CIRCLE 60 ON FREE INFORMATION CARD
Phone Orde rs Minimum AD Order $6,00
303.78 1.5750 Please include $1.50 f or postage
VISA Me accept ed
Phone orders are welco me
Send for our free catalog of unique i tems

PHOTOFLASH SOLAR POWER SALE

'"' AS I,U CAPS ] 10"' HOl cel l i
tP T 35M lJ c' :c, OuTPUT . W n I
I G01T (;1'1((1.. C1918 . 75
r s 010 '--- - - _
\10..,", C. CW, l 12M HOV SPfCl AL 9'1 JCrMA
B FOil $ ?C<J ( 2930 $1. 15 SATTlR'r IlEPl A([ - 0. , --- \
120 VAC ==J-r\
Xenon
.. LARGER SOLAR PANELS .lti',
..- ........ - 6V 125..." $ 75. 00
i;6: : :: \:
-;;;;71 $7.50 ......-:.- 12'1 500", ,, $150. 00 . ' .

P.O. BOX 2703 8

CHANEY DENVER. COLORADO 80227
e lectronics inc .
(MUSICIANSI)
) BUILD YOUR OWN t
t MIXINGCONSOLE!
o

$ 2.75 EA.
14 pin st yle
3 . mp cont act s
BRAND NEW
P.C. Mount
RED JUMB O DI FFUSED
10 for $1 ,50
GREEN JUt-.ABO DIFF USED
10 fo r $2 00
YELLOW JUMBO DIFFU SED
10 f o r $2 00
.079 * X .098"
20mA at 1.75v
10 lor $1.00
20010r $18.00
40010r $32 .00
1000 lor $70.00
SUB MINI L.E.D.

dill used rltd led With built

InlliUhln9unit T 1 ' . pl ck ll ; . "


440/220 TO 110 VOLT
TRANSFORMER
FLASHER LED
Lilronix FRL4403
22/44 EDGECONNECTOR
TINSOLOERTAll .1S6"x .200"
4PDT PRINTED
CIRCUI T 12 VDC
I
COMPUTERGRADE
CAPACITORS NEW
1,700mfd
ISO VDC &.QQ
2 1/ 2 l' Ol " X 4 3/4"
6,400mfd
6 0 VDC 52. 50
13/8" 01"" X 4 1/4"
11,500mfd 18
1 3/8 "01A X 31/4" H I Gf1
22,OOOmfd 15 VDC
2 " C IA X 2 l/lJrt t-i IOH
52,OOOmfd 15 V DC
2 .... O IA X 4 1/2 II H I G H
A-B SWI TCH

75 OHMS
_ - -... . TO 75 OHMS'
- $ 3. 50 EA.
RELAY
I
SUPER SMALL
PHOTO-FLASH
170 MFD 330 VOLT

11/4'X 7/B'
:c:rj 2 lor $1.50
10 lor $1400
RFI
LINE FILTER
for line to lin e
& line to ground
nol l upp r...lon

# IOKe
Rated: 10 amp
115/250 Ii
: SO-400hz
$ 3 .75 ea.
10l or $ 35.00
Upj" ll yl .
Jlmpconhlcl s
24 voltdc. or
120voll.c. co,1
Uudbullu!tyl esl ed
$1.70 EACH
speci ly coll wolta ge
LARGE QUANTITIES AVAI LAB LE
SOCKETS FOR RELA Y eceNen
4PDT
I
CIRCLE 56 ON FREE INFORMATION CARD
KEY SWITCH
S.P.S.T.
RATED 4 AMPS
12S VDLTS
3.50 EA. .
__---.;.__........
120voll ,
primaries
6 VOLTS at 150mA $1.25
12 V.C.T.at 500mA $2.50
16.5 V. at 3 AMPS $6.50
Q
br i
9
ht red color
" Ideal for alarms
': 6 in. di a. bell I
loud r ing
$15.00ea.
D.P.D.T. C'b';VR
Mli
l
,
RATED 5 AMPS
, @ 120 VOLTS
'" $2.00 EACH
!l4"PHONE JACK
f
MOLDED PLASTIC
. NOSWITCH
10 FOR $ 1.00
,f'!: 100 FOR $ 9.00
, 500 FOR $ 40 .0 0
1000 FOR $ 70 00
88
C/)
a
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ex:
I-
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ex:
Phone: (305) 887-8228
TWX: 810-848-6085
We acce pt MasterCard and Visa.
SURPLUS
ELECTRONICS
CORP.
7294 N.W. 54th Street
Miami, Florida 33166 WHOLESALE/RETAIL
EQUIPMENT/COMPONENTS/WIRE & CABLE/ACCESSORIES
"TANK BATTLE" TV GAME
Injustashort time andwithafewminor parts,themost
novice hobbiest can complete thisexcrtingTank Battle
game. Createafun-filledeveningforthewhelefamily.
Two independent tanks rumbl ethruland minefields,
shoot shellsandfragment when hit.Four distinctengine
sounds areproducedtorthe different speeds. Sounds of
gunfire, shell bursts and tank explosions arerealistic.
Automatic on-screen scoring . Supplied with schematic
drawing.
SOLDASIS
$9.95 ea.
50-99$6.00
1OO-UP $5.50
:" ,' ;':;
, 1 I I f,
..., :=.-
:ful:lI,r >l\iii'
"'"
e
200 UA, 2Y2"x 2Y2"Sq.
Scale: 1-30 db top (orange),
0-50 bott om (black)
$4.95 ea.
E. F. JOHNSON
SIGNAL STRENGTH
METER
C. B. SPECIAL
CONVERT THESE TO 10METER FM
New printed circuitboardassembly. (Squelch pot.
vol ume control and channel switch not included .) Boards
sold asis. the way we bought them from the
manufacturer. Board dimensions 6"x61'.! :
1-9 $7. 5 0
... 10-49$ 6 . 50
Edge Meter 250 UA,
fits in %"x 1a" hole.
Blackbackground.
Scaie1-20Top,
0-5 Bottom.
$1 .25 ea. 5/$5.00
E. F. JOHNSON S METER
TRIMMER CAP

PANEL METERS
25-0-25 VDC, 2%" x 3"
0-25 VDC 2W' x 2W'
0-25 VAC' 2W' x 2W'
(Shunt'reQuired)
$4.00 ea. 2/$7.00
1.5-20pF(ARCOPC-402)
ea.
7 POSITION$1.30 ea.
8 POSI TION$1.50 ea.
12 POSITION $2.00 ea.
DIP SWITCH

COPPER CLAD BOARD

(Double Side)
Size9.25 x 10.75
Thickness .062
$2.00 ea.
AMP METERS
2W square, no shunt required.
Easy to read dial.
Movement: 0-6, 0-10, 0-17
$2.50 ea.
SUBMINI10K POT
,. ,. <==. with On-Off
IlkJ:.. '14" hole mount,
'j; '18"Dshaft,
'14" threadsection. Hardware included.
4 /$1.00
ASTATIC TUG8D1 04
MICROPHONE
Pre-amp desk-top microphone withcrystal
element 3-pinplug.
$35.00 ea.
COAX CONNECTORS
UG-273/ UBNC-F/ UHF-M $2.50
UG-255/ UBNC-M/ UHF- F $3.00
UG-146A/UN-M/UHF-F $4.50
UG-83B/UN-F/UHF-M $4.50
UG-175 RG-58Adapt $ .20
UG-176RG-59Adapt $ .20
UG-1 094BNC-F/ Panel $1.00
S0239.60
PL259.60
500 OHMCOAX
Low loss = RG174
$4.95/100' $3.00/50'
USED MUFFIN FANS
3-Blades,
110v AC,
4'14"
square.
$ 5 .95 ea.
NEW SPRITE FAN
Mfg. by Rotron Inc. ,
Model SU2A5. 115vAC. 19amps.
(Impedance protected.)
3'14" x3'14"X1'14 "
$12 .00 ea.
TERMS: All material guaranteedunlessotherwisestated. If youare not satisfiedwithour product,it maybe returnedwithin10daysfor a refund (lessshipping). Please
add$4.00for shipping andhandli ngon all orders. COD's acceptedfor orders totaling$50or more. All ordersshipped UPS unless otherwise specified. Florida residents
pleaseadd4%salestax. Minimcmorder, $15.00. Foreignorders- USfunds only, add20%for shipping and handling.
COMPUTER GRADE ELECTROLYTICS
.....
CD
CD
.....
:>
c
o
c
en
-(
Movement
7101 SPDT
7103 SPDT
(center off)
7108 SPDT
(momentary)
7201 DPDT (special
large rocker)
$1 .00 ea. 6 /$5.00
L-3
J-3
Part #
J-60
J-60
C & K SWITCHES

L-3 J-60 J-3
9 VOLT Ni Cd
RECHARGEABLE BATTERY
NEW. Replaces
the popular 9V
Transistor Batt ery. .'
$4.75 ea. .. .
AXIAL LEAD
ELECTROLYTIC
CAPACI TORS
2 uF@ 15V 12/51.00
10uF @ 15V 12/$1.00
20uF@ 15V 12/$1. 00
50uF @ 15V 12/$1.00
2.2 uF @ 25V 12/$1.00
3.3 uF@ 25V 12/ $1.00
1uF @ 35V 12/ 51.00
2 uF@150V 12/$1.00
25uF @ 25V 15/ 52.00
3 uF @ 50V 15/$2.00
5 uF@ 50V 15/$2.00
10uF@ 50V 15/$2. 00
250 uF @ 25V 10/ $2.00
100uF@ 50V 10/$2. 00
50uF@ 75V 10/$2. 00
14pin 4Dea.
16pin 45ea.
24pin 75 ea.
40pin$1.75 ea.
IC SOCKETS GOLDPLATED
WIRE WRAP
PRICE
$4.00 ea.
$3.00 ea.
$2.00 ea.
$2.00 ea.
$2.00 ea.
$3.00 ea.
$2.00 ea.
$2.00 ea.
$2.00 ea.
$2.00 ea.
$25.00 ea.
weather &water-proof
(can beused underwater) ,
mfg. byUniversrty Sound,
16OHM, 25watt.
350-10,000 HZ.
6" diam. x 5" deep.
SPEAKER
DIAM./LGTH.
3" x5%"
1W' x53/ 4"
1%" x2%"
1%" x2"
1W' x 4Yz"
3" X 5Yz"
1W' x2W'
l Yz" x3W'
1'14" x3%"
1%" x 2"
VOLT5
@ 15V
@ 20V
@ 25V
@ 25V
@ 25V
@ 50V
@ 75V
@ 100V
@ 300V
@ 450V
SPEAKER
VALUE/MFD
63,000
10,000
2,700
2,900
3,000
34,800
450
500
240
50
$2.00 ea.
3" Diam.,
8 0HM,
5 Watt s.
CIRCLE 23 ON FREE INFORMATION CARD
89
HOCKEY HANDBALL
MULTI-FINS HEAT SINK
CUBO CLOCK CASES
TENNIS JAIALAI
PART ' 57456
All brand new top quality
plastic cases. originally oe-
signed for Cubo clocks. Case
comes with top and bottom
cover with adetachablefront
red filler for LE 0 readouts.
This can be used for many
projects suchasLED CLOCK.
VUMETER. LIGHTBOUREO
COUNTER, ETC.
3 Attractive Colors
(white,limegreen ororange)
BUY 3 FOR ONLY$2,50
" :-: e _ I

oJ e - ' -
, ,
. . . ..
TV GAME BOARD
PLAYS4GAMES;TENNIS; HOCKEY; HANDBALL
AND JAI-ALAI.
All boards completewithall partsreadytoplay. ReqUi res
6Csize batteriesand asmall speaker forsoundeffects
The boards weresurplusfromafamousgame manufac-
turer. They Will playonall US standard blackand white
or color TV sets.
Regul arprice for thesegameswere $39.50each
OU RPRICE ONLY$6.50 EACH
Ideal for high power output.
tHoles predrilled for 1 to 3
transistor. Made of alumi num
3" with tenradiating fins.
2 FOR$4. 50
+---4" -
MARK IVKIT$31.50
$41.50 EACH KIT
All functions same asMarkIVbutthis iswithheavy duty
aluminum front plateandcase. Can beeasil y slotintothe
frontpanel of your auto,truckor boat. Operates on 12VDC.
MARK IV 15 STEPS
LED POWER LEVEL
INDICATOR KIT
This newstereo level indicator kit consists of 36 4-
color LED (15 per channet) to indicate the sound
level outputof your amplifier from- 36dB ...... + 3dB.
Comes with a welldesigned silk screen printedplas-
nc panel andhas a selector switch to allow floating
or gradual output indicating. Power supply is 6......
12V D.C.. with THG on board input sensitivity con-
trols. This unit canworkwith any amplifier from1W
to 200Wl
Kit includes 70 pes, driver transistors, 38 pes,
matched 4-color LED, all other electronic cornpon-
ents, PC board and front panel.
,i:;x MARK V 15 STEPS
r.t-r LED POWER OUTPUT
INDICATOR KIT
BATTERY POWERED
FLUORESCENT LANTERN
MODEL 888R FEATURES
3
.Circuitry: designed for operation by high
efficient, high power sil icon transistor
I which enable illumination maintain in a
standard level even the battery suppl y
. drops to a certain low voltage.
9" 6W cool/daylight miniature ..
cent tube.
8 x 1.5VUM-l (size D) dry cell batter) .
Easy sliding door for changingbatteries.
$10 50EA staintess reflector with wide angle in-
. creasing l urni nati on of the lantern.
30W+30W STEREO
HYBRID AMPLIFIER KIT
TAl 000 KIT
$51.95
Power
transformer
$18.00 lICk
Model 968
$4.50 each
WHISTLE ACTIVATED
SWITCH BOARD

l00W CLASS A
POWER AMP KIT
Bias Class " A" circuit design makes this
cmt unique In Its class. Crystal clear, 100 watts
power output will satisfy the most picky fans. A per-
fect combination with the TA-1020 low T.I.M. ste-
reo pre-amp.
Specifications:
Output power: 1DOW RMS Into 8-ohm
125WRMSInto 4-ohm
Frequency response: 10Hz 100 KHz
THO: less than 0.008'10
SINratio: better than 80dB
Input sensitivity: IV max.
Power supply: 4 0V @ 5 amp
One channel
Uses UA723 I.C. and 2N3055 power transistor as
regulator. Output voll ages can beadjustedfrom 00--30V
at aninternal resistanceof less than 0.005ohm; ripple
andnoise less than1 MV; with built on board LEDand
audibleoverloadindicator.Kit comes withP.C. board; all
electroniccomponents. transformer; connectors; 2panel
meters for voltage and amp; a professional lookmetal
cabinet and instructions.
Model TR-8aA OM 5V D.C. 3 amp
Model TR-88Bo--30V D.C. 2 amp
$59.50
per kit
All boards arepre-assembled andtested.Yourwhistleto
its FET condensermicrophonefrom adistance. asfar as
30 feet away (sensitivity can beeasily adjusted) will
turntheswitcn on thenlatched you whistle to it again
thenIt turns off. Ideal for remotecontrol toys. electrical
appliance suchasilghts. coffeepots, TV, Hi-Fi, radio or
other projects. Unit workS on 9V D.C.
REGULATED VARIABLE
D. C. POWER SUPPLY KIT
Ali units are brand new
from Sanyo.
MODEL 115-B-405A
$35.00 EACH
FOR 'BOX' BUILDERS
Pre-Drilled PC Board $17.50
TolriodCoils (Set of 4) $ 3.00
Multi TurnTrim-Pots 10Kohm $ 2.50
Trimmer Capacitor 6-35pF $ 0.60
MC1358 $ 2.50 RC1458 $ 1.00
MC1350 $ 2.00 LM380 $ 1.80
MC1330 $ 3.50 LM340T-1 5 $ 1.20
NE565 S 2,00
We also have transformer, capacitors set, resistors
set antennatranstormer. Please call for price.
'$32.50 PER KIT
.:[/2-[1'5;
I ..
5W AUDIO AMP KIT

2 LM 380 with Volume Control

J1IJJJJ I Power Suply 6 18VDC
. ONLY$6.00 EACH
umml 0.5" LED ;JillJ
ALARM CLOCK MODULE
ASSEMBLED! NOT AKIT!
Features: 4 digits 0.5" LED Displays 12 hours
real time format 24 hours alarm audio output
59 min. countdown timer > 10min. snooze control.
ONLY$7.00EACH
SPECIAL TRANSFORMER
FOR CLOCK
$2.50
TWO IN ONE PANEL METER
D.C. VOLTAGE
......r ANDAMP INONE
D.C. Volts reads 0-50
l
'h " D.C. Amp reads 0-3
Meter casemade ofblack plastic
with a white scale plate and
=--' glass window.
..--3" #ST.6BO $12.50 EACH
BUY 2 FOR
$4.99
2 WATT AUDIO AMP
Pre' assembled units. All you need is to hook up the
speaker and thevol umecontrol.Supply voltagetram9,....
15VD.C. measures only 2" x 3y," , making it good for
portable or discrete applications. Comes wllh hook up
data.
NEW MARK III
9 Steps 4 Col ors
LED VU
Stereo level indicator kit with arc-shape display
panellll 'Thls Mark III LED level indicator is a new
design PC board with an arc-shape 4 colors LEDdis-
play (change. color from red, yell ow, green and the
peak output indicated by rose) . The power range is
very large, from -30dB to + 5dB. The Mark III in-
dicator is applicable to 1 walt - 200 walts amplifier
operating voltage IS3V- 9VDC at max 400MA. The
CIrCUit uses 10 LEOs per channel. It is very easy to
connect to the amplifier. Just hook up with the
speaker output!
INKIT FORM $18.50
en
o
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o
II:
@
....I
W
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II:
90
CIRCLE 17 ON FREE INFORMATION CARD
FLUORESCENT LIGHT
DRIVER KIT
12VDC POWERED
Lights up 8 15Watt Huo-
rescent Light Tubes. Ideal
for camper, outdoor, auto or
boat. Kit includes high vol t-
age coil. power transistor,
heat sink, all other electro-
WithCase Only nic parts andPC Board. light
$6.50PerKit tube not incl uded!
BATTERIES
PK/$10.00 CADMIUM
2 PKS/ S19.00 ' . BATIERY
ILLUSTRATED PACK
LESS COVER '0' SIZE
Output: 3.6 Volt, @ 3.0 Amp/ Hour. Consistsof three each,
12 Volt "D" size Nickel Cadmium Cells stacked and plastic
fi lm encapsulated. Tabs are provided at each end for elec-
trical connections. The i ndividual cells can be cut apart if . _ ;..., ..
jesi red Rated recharge rate is 30 rnA, 14-18 hours. Size:
1V. " dia. x 7" long New. Shpg. Wt. each pack, 1 l b.
.....
co
00
.....

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(J)
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91
SWITJ:C _.

,..
1 WATT AUDIO AMPe
All parts are pre-assembled on a Jp
mini PC Board. Supply Voltage 6
9V D.C. SPECIAL PRICE $1.95 ea.
LOW TIM DC STEREO
PRE-AMP KIT TA-l0 20
Incorporates brand-new D.C. design that gives a
frequency response from OHz - 100KHz O. 5dB!
Added features like tone defeat and loudness control
let you tailor your own frequency supplies to eli-
minate power fluctuation!
Speci fications: T.H.D. less than .005% T.I.M.
lessthan.005% Frequency response: DC to 100KHz
0.5dB RIAAdeviati on: = 0.2dB SIN ratio: bet-
ter than 70dB Sensitivity: Phono 2MV 47K/Aux.
100MV l OOK ' Output level: 1.3V Max. output: 15V
Tone control : bass 10dB @ 50Hz/tr eble = 10dB
@ 15Hz' Power supply: 24lJ .C. @ 0.5A
Kit comes with regulated power suppTy. all you need
is a 48V C.T. transformer @ O.SA. --
ONLY S44.50
X'former
S4.50 ea.
CONDENSER TYPE
TouchOnTouchOff
uses 7473 I.C. and
12Vrelay
$5.50 each
ELECTRONIC
FLASHER L
Unique design combines a jumbo red LED with an IC
flasher chip in one package. Operates directly from
5V-7V DC. No dropping resistor neded. Pulse rate
3Hz@ 5V20mA.
2 lor 52.20
BIPOLAR LED RED/GREEN
2 colors in one LED. green and red. changes color
when reverse
POWER SUPPLY KIT
0-30V D.C. REGULATED
Uses UA723 and ZN3055 Power , 1
TR output can be adjusted from '"
030V, 2 AMP. Complete with PC _
board and all electronic parts.
Transformer for Power Supply. 030Power Supply
2 AMP24V x 2 $8.50 S10.50 each
CRYSTAL CONTROLLED
No FCClicense WIRELESS
requued 1
OUR PRICE MICROPHONE
$49.50 SYSTEM
ADDITI ONAL Tr ansmitter. FET miC tor Iial
1.11RCOPHON E KHzresponse exiracontrolled49MHz
(TRANSMmER) AM Band lor cnn-neeperformance.
AVAILABLE 100 MWoutput(rangeapprox I,
ATS28.00 EACH mile)forrehalJ/e longrangetrans-
rrusston. Powered bya9V raoro
batrery (InCluded).
. t) Receiver.Extra controuec locks
...u1lA.-....__ on49 MHz transmute-slgnal.
/'II.. W, lhon panel VU meier rnJOitors
theS'Jf131 strengtn
. homtne mero-
MURA WMS49 .. phone Standard
phone jack outlet ccnnecnon to a P.A. or other phone
input. 9VoattervIncluded. trus protessronat setisIdeal
for onstaqe, In field. church. Inhouse or outdoor use.
11101 CRENSHAW BLVD., H AWTHORN E. CA ' 0 250
PHONE: (2 13 ) 111 ' 12 1 (211)
ULTRASONIC
SWITCH KIT
9V RECHARGEABLE
NI-CD BATTERY
Replaceall 006P type9Vbattery
Modei: GC9
BRAND NEW $4.5D EACH
GELCELL 6V9AMP/HR
SEALED LEAD ACID
RECHARGEABLE
BATTERY
Seal edconstruction permits thisbatterv
tobeoperatedinanyposi tion. Recharge
rate 2.15ampmax.for1416hours. All
brandnew..LimitedQuantities. Sizeof
batlery 4V," x 23,'." x 5v,".
$16.50 mh
ELECTRONIC PIN BALL
MACHINE
That sounds andplays likethe
real thing. All units are brand
newbut without the case Func
tions of thegame includedouble
flipper control, kicker cont rol. 1-
4 players. 3 speed ball control,
\lit swucnautomaticscore. extra
bonuscave andmanymore. All
solid state with LEOpanel. no
moving parts. Requires 9Vbat-
tery to operate. speaker not
included.
A perfect gift for yourself or friends.
SPECIAL $8.99 EACH
SPEAKER 51.25 EACH
, SLIM TELEPHONE
': KEY PAD
Weather proof orasnc one piece key-
tops Key numbersfrom 1-0,Allswitches
momentary. OpenoneSi denot connected
oneSi decommon. $3.5D EACH
CIRCLE 17 ON FREE INFORMATION CARD
NI-CD BATTERY SALE
12V Pack450 MZJHR Size 3" x 1" x 2"
$8.00 PER PACK
4 AAPack 450 MA/HR
$3.50 PER PACK
All abovebatteries areusedbutlatedate
cooe and weguarantee totakeback allbad ones forexchange.
Kit includes theUltra Sonic Transducers, 2 PC Boards
for transmitter and receiver. All electronic parts and
i nstructions. Easy to build and a lot of uses suchas
remote control for TV. garage door. alarm system or
counter. Unit operates by 9-12 DC. $15.50
TOUCH TONE TYPE
SOUND ACTIVATED SWITCH
Al l parts completed on a PC Board
SCR will turn on relay. buzzer or
trigger other circuit for 2 - 10 sec.
(adjustable). Ideal for use as door
alarm, sound controlled toys and
many other projects. Supply voltage
4.5V 9VD.C. 2 for $3.00
KIT FORM
SB.75 EA.
"FISHER" 30 WATT
STEREO AMP
MAINAMP(1 5Wx 2)
Kit includes 2 pes. Fisher PA
301 Hybrid ICall electronic parts
with PC Board. Power supply
16V DC (not included). Power
band with (KF1% 3dB) . Volt-
age gain 33dB. 20Hz 20KHz.
ELECTRONIC DUAL
SPEA KER PROTECTOR
Cut off when circuit is shorted
or over load to protect your
ampl ifier as well as your
speakers. A must for 0CL
circuits.
AUDIO OUTPUT d B METER
PRESS-A-LIGHT SELF
GENF.RATED FLASHLIGHT
EXCLUSIVE!! $3.95ea Never worry about battery.
Model F179 because it has none! Easy
to carry in pocket and handy .. -1.
to use. Ideal for emergency
li ght. It generatesits own
electricity by squeezi ng grip
lever. Putonein your car.
boat. camper or home. You
may need it some time!
f
Meter made of clear plastic
witha silverwhitefaceplate.
Scale reads frOO1 - 20 +3dB.
]
" " Meter also comes with
internal dial light.
MODEL: 6F-3
$6.5DEACH

SUPER FM WI RELESS
MIC KIT - MARK III
This new designedcircuit uses high
FEQ. FET transistors with 2 stages

amp. Transmits FM Range (88

120 MHz) up to 2 blocks away and
/ ' with the ultra sensitive condenser ..-----------------'.
microphone that comes with the kit.
-e: allows you to pick up any sound
within 15 ft. away! Kit includes all
FMC-105 electronic parts. OSC coils. andP.C.
$11.50PER KIT Board. Power supply 9VD.C.
Br.n d MW produc tion s.ur pluJ.
All solidstatl .ldul fortxpe,
imtnul w.:>rk bu ild ing, c.blt TV
con , . rt trJ, I tC. No . 350SU099
SALE OF QUARTZ BATTERY
9

to 4V-"",Opltf ..loOnon 1 .. _...
I,,... -C- otll . lmPOrtt from
s.B.t5 'HInt Germany . No. 350VA5o&l
... . / 5 I350VAS65 Muc.. ......hsn6l . S2.491..t.1
$l .'ShIt /S
FAC TO RY SURPLUS UHF TUNERS
4
9 5
$3."
" } 10
" .... "'"...' m oly..' 29
95
h.nd. ReceptIon on ,n y st,o 521 .50
d,rd FM rad,o o r r.cel....r. N . /5
No . : 350VA482: 124 .15
N _/ 10
QUARTER-MILE WIRELESSMICRoa HONE

5& ..
17
$4U&
... . / 5 No. 350VA093

SURPLUS VHF I UHF

" TWIN" VARACTOR TUNERS!
' " \ Ad .,.." No. NC31431.
. 39
95
TV ENDS hMd 10
t ,Ad ,t""', t .. MftUt io 1p" a l S34 .9!>
!\b. 350I/CJ08. "',/5
DUMPINGI NORELCOENDLESS LOOPCASSETTES!
It95 :;:,";.",ofi"" " "y
.,.
IN STOCK - THE MU RA
CORDLESS TELEPHONE SYSTEMI
._.......... 14488
c......ItI __
--,<.--
4OO1f . ......I R.

$ 129 .95
' .Ql.......l_h.,.._' .../ 5.
No. 350VA274
[I

OUR LATEST 98 PAGE

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.a.a,onocb.lrl' ....
oUen . Wr,I. Of t "de U. 1Itf01/
"","on e.G /'IUI'nller bricM
-----------
nco elECTRONICS
NORTH COUNTRYSHOPPINGCENTER
PLATISBURGH. N.Y. 12901
a.et WIt h OftM' , pko_ . V,,,, & M.II hlUfd O\( . ftC C.O.D.' L 4dd 15"
t Of UPS l , H.,wil i.... IEllUU f.....o.d l. N.Y. St..te 1".Iowl u U Il..
0.-,., & Ex pot t inqvltlo" ",.,tl'dOw, l rilpi'lone Ofo., d.tk _ dOlft.
Call 1 518 561 8700.
FM WIRELESS MICROPHONE
REGULATED 12VDC POWER SUPPLY !
..
.. 6988
..... ,,... l.lld,a . sse lone.... up 10
400w P. E.P. B...-l roew. fK lorv
, ... Iord 110 1/AC. No. J50I/A394 SSg 88
1350 I/ AJ9S . " , bo 10""'IK -S5495 .S49t5 u /S .I . a./5
SMASHINGALL SALES RECORDS - OUR NEW
30 CHANNELCABLE TV CONVERTER!

TVM t! ... . ; 5
No . !!.O.... E047
HOT NEWIMPORT! RE. MOTE .
8
30
179.95 onIoff lWlt eh
.... 15 '11"" tuning cont roll
'74.1il5 No. 350 VA.275
... / 10
ETCOMKII WIRELESS -
THE ULT1MATE CABLE TV CONVERTER!

189
00
,t ,1II
No. 350ZAOO8
VIDCOR2000 CONVERTER ELIMINATES PROBLEMS
WHEN VIDEOTAPING FROMCABLE TV
89
95
. . ==
V IDCOR
troi. ENlblft .. 200Q
of one e.Ibll pn.,,,, 'II
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No . 35C1VAlJI5O
UNUSUAL FACTORYSURPLUS

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common t F '..-ousRCY. Expe rt
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Iln clodirn ttc With 117.50
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CAJClll_ l.
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CAJl:lt4 - 2.25
CAJ140 - 12\
LMmI - .116
IOJICC- 31C1

78l.O5. $ ..45
LMlOl5G . $ .75
34QK12. 1501/241/$1.50
J40T 5. 6, a.9, 12.
15.18 01/241/ .. $ .15
LAS, 412 '2VV.u'95
74LW _ 415
74LSl6 - 50S
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141..$112 - 3l
741..$11:1- 415
141..$114 -
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741..5125 - !iO
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SEND $.25 FOR OUR. CATAlOG
FEATURING TRANStST ORS &
RfCTlFIERS. 145 HAMPSHI RE
IT. CAMBRIDGE. MAS S. D21J1
TTL IC SERIES
741] _ 35 74186 - 60
7474 - .40 74166 - .10
7415 - ..40 7411'0 _1,6(1
14Je - .40 1411] - . 7!I
7.480 - 45 7.,74 - .66
7483 - .50 74175 - .60
'.":' .66 74176 - .75
74815 _ 42 7. ,n - .75
1490 _ 45 74180 - . 75
1491 45 74181 -1.90
7.492 .45 74182 - ,45
7.493 - 45 74190 - . 1'0
1494 ,6(1 741'1 - . 15
7496 60 74192 - .10
7496 - .60 74193 - .79
74107 - .35 74194 - 86
74121 -.35 74195 - .45
74122 - )') 74196 - .15
74123 - 42 14191- .15
74125 - .45 14179 - 60
14126 - ..45 66
- .15 74351 - e6
_ 1.10 74368 - .M
14151 7Q90 - 90
741S,] - .40 75324 - 2.25
15154 - 1. 10 74325 -
7. '66 - 75491 - 1.06
74157 7M92 - 1.1)6
74160 - 85 8nt1 - 20
74161 _ 66 9312 - 60
74161_ .150 9601 - .15
74163 - .60 9E02 - .75
741154 - .60
TRANSISTOR SPECIALS
2toltJOll'HI"Gl:YOl

rIol41
Y.,lO I. "'415
T.'21 leo "1"" .

",RJ.al104 .. ce RJ YRAHSlSfOlIl NI"N
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lM337 .. .. . . $2.50
J23/Cfjl/3A fIO
79HG\( CSV,t SA M .Jl5
123 . . . ... $
J20 T5. 120f 15V $.90
78M(l6 . $.35
FUU WAVE BRIDGE
PRY 2A M 25A
100 1.40
200 .80 1.30 2.20
1.00 1 65 330
eco 1 30 190 U O
REGULATORS
DIP SOCKETS
8 PIN . 17 n PI N .30
14 P1N 20 24 JItN 35
16 JItN 22 28 P1N 40
18 P1N 25 40 PlN 60
7XJ - . 17
7401 - . 17
7<ftJ2 - . 11
7403 - . 11
7404 - ..24
7-405 - .24
7-.06 -; .33
7i107 - 35
7408 - .27
70409 --24
7410 . 17
7411 - ..22
741J .42
741-4
7416 - ..33
7417 _ " .37
7420 _ . 11
10 - .30
7426 - 33
7427 - .30
7430 - . 11
7432 - .27
7437 - .17
7438 - .27
7440 . 11
7441 - .85
7442 - .45
7445 - .10
7446 - .75
7447 - 66
7448 - .75
7450 - . 11
7472 - .35
TtRMS :F08 CAMBRIOGE. MASS. SEND CHECK
Oft MONEY OFIOER. MINIMUM TELEPHOkE,
C.O D. PURCHASE OROf.R Oft CHARGE $20 00
M.....MUM MAl. OADR .5.00 .
WE SHIP OVER 95%
OF OUR ORDERS
WITHIN 24 HOURS
OF RECEIPT
SPECIALS
SPECIALS GOOD THRU AUG . 1981
10% DISCOUNT ALLSCR'S & TRIACS
4 ea. 2716 ROM'S (+ 5V) .. 28.00
8 ea. 4116-3 RAM'S 20.00
MC68000L 125.00
8164E64K x 1 RAM (150NS) 39.00
15% Discount
All 74LS and S Series
20% Discount
340T and 320T Regulators
L14H4 1R& Visibl e Det ector ITO-92)
3/$1.00
NO. 30 WIREWRAP WIRESINGLE STRAND
100 $1.40
IN4148(IN914)
15/$1 ,00
.5V at 800ma SOLAR CELLS
3" diameter $4.35
7 SEGMENT DISPLAYS
FSClI024-4d;git DL707C.A. .3 $ .75
C.C. Bdiopl . . . . . $5.95 DL747C.A. .6' $1.50
FND 503C.C.. 5 $.85 FND810 .8 CA $1.95
FND 510C.A. .5 $ .85 FND803 .B CC $1.95
OL 704 .3"' C.C.. .. $ .86 MAN5C.C.Groen . $ .75
MA .A. Ye llow .$ .75
ALCO MINIATURE TOGGLE SWITCHES
MTA 1060 SPOT . . . . . .. .. . . . . . ... . .. . . . . . . $1.20
MTA2060POT .. .. . .... ... . . . . . . . . . . . . . . . . $1.10
MSD206 PDPDT CENTEROFFLEVERSW ITCH . $1.85
FP 100 PHOTO TRANS . . . . .. $ .!SO
RED. YEllOW. GREENor AMBER LARGElEo-s .2 6'$ 1.00
RED/G REEN BIPOLAR LEo- s . . . . $ .56
MlE D92 IRlED . . . $ . 75
MRD148 PHOTO DARL. XTOR . . .. .. . .. .. $ .50
T1t 118 0Pt ().I SQlATOR . . . . . . . . . . $ .45
Il 50PT().ISOLATDR . . . . ..45
l WATT ZEHERS ; J .3. 4 .7. 5 1. 5.6. 6 8 . 82, 9.1, 10.
12. 15. 18,01/2ZI/ . . . . . .. . . . .. . . 6/ $1,00
MINIATUREMULTITURNTRIMPOTS
50,100. 5K, 10K. 250K . . . . . . . . . ..7S ea ch 3/ $2.00
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1.SA ... 35A ll OA ' PRV lA lOA 2'SA
100 .45 .60 1.40 . 100 .45 .80 1.56
:m .70 .80 1.90 9.00 200 .... 1.30 2. 10
400 1.20 1.40 2.60 12.00 400 1.30 1.90 3. 10
600 1.80 3.60 15,00 600 2.00 2.75 '.30
CRYSTALS $3.45 ea.
2.000 MHz 6 . 144 MHz
4.000 MHz 8.000MHz
, 3.000 MHz 10.000 MHz
3.57 MHz 18.000 MHz
5.000MHz 18.432 MHz
6.000MHz r 20.000MHz
, C/MOS "
- $ .40
- $ .30
3/ $1.00
5/$1.00
$ .60
$ .85
$ .75
l OUFlOV
22UFl OV
15LJFl6V
3OUF6V
33UF2OV
47UF 20V
12OUF6V
SHIFT
REGISTERS
104 104 1402 1.75
... 104 1403 1.75
104104 1404 1.75
MM50 1J
MM50115 2.!SO
MM5Cl66
MM5Ol56 2.50
MM5057
MM50M
MM5060 - 2.50
RS232
CONNECTORS
DB 25Pmale $3.25
DB 25S female $4.25
HOODS $1.50
--
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7 WAn LD 65 LASER
DIODE IR $8.95
25 watt Infra Red PWseISG2006equiv-l
los [);ode IS""""-' mdudodll $24.95
POSTAGE ADD10% FOR ORDERS UNDER $20.00
RATES ADD5% FORORDERS BETWEEN $20.00AND$50.00
ADD3% FOR ORDERS ABOVE$50.00
.47UF35V 5/ $1.00
.68UF35V 5/$1.00
lUF20V 5/$1.00
22UF20V 5/$1.00
3.3UF20V 4/$1.00
4.7UF35V 4/ $1.00
6.BUF35V 3/ $1.00
2N3820 PFET . .. . . . $ .45
2N5457NFET. . . . . . . $
2N2646 UJT.. . . . .. . .. .. . $ .45
ER 900 TRIGGERDIODES. . . . . 41$1.00
2N6028PROG. UJT.. .... . . .. $ .S!?
DISC CAPA CITORS
. 1UF 16V .. . 10/ $1.00. . .. 100/ $8.00
.01UF35V 100/$5.00
MM5314 15 MM5316 t4.95
14PIN HEAOER 1.
16 PIN HEAOERS. . . . . . . . . . . . . . . .40
24PIN HEAOERS. . . . . . . . . . . . . . . . .75
40 PIN HEAOERS 1.10
50PIN EOGEBOARDCONN 3.95
26PINEDGEBOARD CONN 2.50
50PINRIGHTANGLECONN 3.95 '
20PIN RIGHTANGLECONN 2.25
1M ' thickwith 111 0' spacing
4Y," X 6Y," . . . . . $1.95
INTERFACE
& DRIVERS
1488 - .90
1489 - 1. 10
8130 -
8830 -
8BD - 2.50
8B34 2.00
Il831
8B3B - 2.00
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Proto Boards
P8-6 lIU5 PB-I l)4 54 00
PB-l oo 18 00 PB-2OJ 9700
, PB-10 1 2100 PB-203A 14900
2500 PB-203 A tw 12) 00
PB-l 03 43 00
\
35 7<:LSl64N 119
28 704LS1 65N 89
28 74L5 166N 2 "'8
28 74L5168N 18 9
39 7" LS169N 1 89
28 7"L S17ON 199
39 7" l 5173 N 89
39 74l517.. N 99
28 7" LS175N 99
39 74LS181N 220
3D 74L5 19ON 115
"7 74L5 191N 1 15
1 25 7"L5192N 96
704L5193N 96
26 74L5 194N 1 15
38 74LS195N .95
38 74L519 6N 89
39 74L$ 197N .89
39 74L$ 221N 1.49
39 74L5240N 1.95
26 74L$24 1N 1.90
39 74L5242N 1.95
79 7" L5243N 1 95
39 7" L524" N 195
.26 74LS245N 4.95
79 7" LS247N 1 10
.79 74LS248N 1.10
.79 7" LS2"'9N 1 89
26 7.. \.525 1N 1.79
35 7.. LS253N .. 96
.35 7"LS257N .96
"'5 7"LS258N .g&
59 74LS259N 2.95
.&8 7"L$26ON .69
"5 7"LS 2lS1N 2.49
.85 74L5258N .59
99 7" LS273N 1.75
1.19 74LS275N " .40
"5 7" L5279N .59
.75 7" LS283N 1.10
.75 74LS290N 1.29
.75 7" LS293N 1.95
88 7"l5295N 1.10
98 74LS298N 1.29
." 5 74L83 2"'N 1.75
"5 74LS347N 1.95
...Q 74L534 8N 1.95
." 9 7" LS352N 1.65
55 7"' LS353N f .65
.55 74LS3&3N 1.049
1.19 7"LS365N .99
1.35 7"LS36&N 99
.89 74LS367N .73
.89 7"LS368N .73
.79 7" LS373N 2.75
59 7"LS374N 2.75
.89 7"'L5375N .lS9
89 7"'LS377N 1.95
1.25 7"'LS385N 1.95
1.49 7" \.5386N 65
.79 74\.5390N 1.95
.79 74L53 93N 1.95
2."9 74lS395N 1.70
1.19 74L5399N 2 95
.99 74\.S424N 2.95
99 74LS668 N 1.75
.75 74LS670N 22 9
98 81LS95N 1.99
1.15 8 1L596 N 1.99
98 81lS97N 1.99
.98 81L598N 1.99
74LSOON
7"'LS01N
7"L$02N
7"LSOJ N
7"LS004N
7"LS05 N
7.. LS08 N
704LS09N
7" LS1ON
7" L511N
74L512N
7"'LS13N
74LS14N
74L515N
74L52ON
74L52 1N
74L522N
74L526N
74L527N
7" LS28N
74LS30N
74L532N
74L$37N
74LS38N
704l.S<4ON
7"LS042N
7"L S047N
74LS.048N
7"L$51N
704LS54N

7" L573N
704L5704N
704LS75N
74LS7!SN
74LS78N
74\.583AN
74LS85N
74LS8&N
74L59ON
74L59 2N
704LS93N
7" L5Q5N
74l596N
7" L5107N
7"l5 1QgN
74l 5 112N
7" l5113N
74l5 1UN
7" l5122N
704l5123N
74l512"N
704L5125N
7"LS 128N
7"L5132N
7"LS138N
74L5138N
7"' LS139N
704LS1 45N
704LS1 A8N
704LS1 51N
74LS153N
704LS1 5'''N
704LS1 55N
7"'l51 56N
74l$157N
704l5158N
74l$16ON
74L5161N
7"'L5 162N
74L5 163N
CIRCLE 13 ON FREE INFORMATION CARD
74LSOO
LINEAR
78H05 595 LM1414N 190
78M06 1.49 Lf.41"58 CN/N 49
78MG '''9 MC1"'88N 1.49
LM105H .99 MC1489N 149
LM108AH 2.95 LM1"96N 89
LM300H 79 l M1556N 1.50
LM301CN/H .35 LMl 800N .79
LMJ()4H 98 LM18 20N 95
lM305H 89 LM18 50N 95
lM306H 3 25 LMl889N 3 95
LMJQ7CN/H 29 LM2111N 1 75
LM308CNlH .98 LM2900N 99
LM309K 149 LM290 1N 2 50
LM310CN 1 25 LM2917N 2 95
LM31 10!CN/H 98 CAJ013T 229
LM312H 17 5 CAJ0 18T 1.99
LM317T 275 CAJ021T 349
LM318CN/ H 1.49 GA3023T 2 99
LM319N/H 125 CAJ035T 2 75
LM320K XX 1.49 CA3039T 1 49
LM320TXX 1 25 CA3046T 1 29
LM320H XX 1 25 LM3053N 1.49
LM323K 4 95 CA3059 N 3.25
LM324N 1 25 GA3060 N 325
lM339N 95 CA3062N 4.95
LM340KXX 1 49 LM306 5N 1 49
l M34QTXX 1.25 CA3080 N 1 29
LM340HXX 1 25 CA308 1N 1 69
l M344H 195 CA3082N 1.69
l M348N 185 CA3083N 1 99
LM358CN 98 CA3086N 1 29
lM360N 1 49 CA3089N 275
LM372N 1 95 CA3096N 2."'9
LM37 8N 3.75 CA3097N 1 99
LM3 77N 3.75 CA3130 T 2 49
LM380CNIN 1 25 CA3140T 2 "9
lM381N 17 9 CA3146N 2 "'9
LM383T 195 CA3160T 1"9
LM386N 1 49 CA3 190N 1.95
LM387N 1.49 CA3"'01N 69
l M390N 1 95 MC3423 N 1."'9
NE531VIT 3.75 MC3460 N 3 95
NE5S5V 39 OO3524N 395
NE55SH 98 CA3600N 3.50
NE56ll 19.95 LM3900N .59
NE562B 7 95 LM3905N 14 9
NE565N/H 1 25 LM3909N 98
NE566HN 175 RC4131N 2 95
NE567V1H 150 RC4136N 1 10
NE592N 27 5 RC4151N 4 50
LM702H 299 RC4194 495
LM709N/ H .29 RC4195 4 "'0
LM710N1H 98 UlN200 1 1 25
LM711N/H 39 UlN2003 1 50
LM715N 1 95 5N75450N 59
lM723N/H .75 5H7545 1N .49
lM733N/ H 98 5N754 52N 49
l M739N 1 15 SN75453N 49
LM741CN/H 33 5N75454N 49
LM7" ' CN' 14 .HI SN75ol91N 89
lM747N/ H .79 5N75492 N 89
LM748N/H 39 5N7549 3N 89
lM7lSOCN 2 95 5N75494 N 89
LM13 10N 190
5'
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2 95
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1.69
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1.80
.75
1.75
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1.95
1.515
9.95
3.90
1.15
1.15
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65
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65
65
.65
13.
139
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1.05

2.15
390
3.90
1.25
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66
66
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190
190
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2.95
2
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12.95
12.95
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2.39
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2.75
275
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1.95
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.35 Co4oo3
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.35 CO" 098
1.39 CD4099
29 MC1" 0408
1.39 MC14409
49 MC1" "" 0
.49 MC1.... ,2
.35 MC14"'5
29 MC14419
49 C04 501
1.39 CD4502
1.15 CD4503
.59 C04505
1.19 C04!S06
C04507
49 C04508
1.19 C04510
1.19 C045 11
1.15 C04512
38 C04515
.79 C0 45 16
38 C045 18
65 CD4520
.85 C0 4555
1.29 C04 5S6
... 5 C04566
3 25 74COO
2.15 74C02
325 74Cl:).(
.95 7"coa
1 95 HC10
1 29 7" C14
1 25 74C20
95 7"C30
85 HC32
85 7"C42
1.75 74C4a
1 25 7" C73
.99 74C74
69 74C85
69 74C89
1.10 ;:4C90
110 74C93
11 0 74C95
395 74Cl07
295 74C1 51
9.95 74C154
139 74C157
75 7"'Cl 60
35 7"C1 61
49 74C163
35 HCt64
.35 74C173
35 74C17"
.35 74C175
1 29 74CHI 2
35 74C1S! 3
35 7"'C195
35 74C922
35 74C923
1 95 MM8OC95
295
7400
5NH1' 23N
5N7.. 125N
5N74126""
5N7"128N
5NH132N
SHHI36N
SN7.. 139N
5NH1" , N
SNH1"2N
SN7.. 143N
SNH1.... N
SN7.. 145N
SH7" 147H
5N74148N

5H7"' 51N
5N74 152N
5N71153N
5NH154N
SN74155N
SN7" 155N
SH7"'57H
SN74158N
SN74160N
5N7"'61N
5N704162N
5N7041 83N
SN74164N
$NH185N
5N7" '66N
5N74 187N
SN7",70N
5N7"' 72N
SN7"173N
5N7"174N
SNH175N
SN74178N
5N74177N
SN7"'79N
5N7418ON
5N7"'81N
5N7418 2N
5NH 184N
5NH 18!lN
5N7..188N
5N7..188N
5N7 ..1lKlN
5N74191N
5N7"'92N
5N74193N
5N7411)-4N
5N74 195N
5N7" 198N
5N74 197N
5N741D8N
5N7"'199N
5N7422 1N
5N7"'25 1N
5N74273N
5N7"'279N
5N7 "'283N
5N7"'28"'N
5N7"'285N
SN7" 29QN
5N7"298N
5N74365N
5N74366N
5N74J67N
$N74368N
5N7"'39ON
5N7 "'393N
5N7"49ON
C0 4000
CD4001
004002
C0 4OO6
C!J4007
CO<OOll
C04OO9
COo401 0
C040 11
COol 01 2
COol013
COol 0 14
C040 1S
C04016
CD4017
CD4018
C04Q19
CD4020
C04021
C04022
CD4023
C004024
COol02S
C004027
Co.-028
Co.-029
CO<OJO
CO<OJI
C040 32
CO<OJ.
CDoI035
CD4037
C04040
C04<l4 1
C04042
CD4Q43
COol04"
CD404 5
C""""7
C04048
C04049
C04050
CD40S1
C040S2
C040S3
C04055
CO"OS6
C0405 9
C04060
C04066
C04069
C04070
C04Q71
COolO72
C040 73
CD4Q75
C0407 5
C04077
co..078
C04081
C""""2
C""""5
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SN70400N
$N70401N
5N70402N
5N70403N
5N70404N
5N70405N
SN70406N
$N70407N
$N70408N
SN7409N
5N74 10N
SN74t1N
5N7041 2N
5N7413N
$N7414N
$N7416N
5N7417N
$N7420N
SN7421N
5N7422N
5N7423N
5N70425N
SN70426N
$N70427N
5N70429N
$N704JON
5N70432N
5N7437N
5N7" 38N
5N7439N
5N74040N
5N70441N
SN70442N
SN7443N
$N74N
5N74045N
5N7"04$N
5N7"47N
5N7..048N
5N70450N
5N7"!it N
5N70453N
5N70454N
SN70459N
5N704&ON
SN70470N
5N70472N
5N7473N
5N747"N
5N7475N
5N704 7lSN
5H7479N
5N70480N
5N70481N
5N70482N
SN70483N
SN70485N
SN748lSN
SN74S9N
5N7049ON
5N70491N
5N70492N
5N70493N
5N749"N
5N70495N
SH7496N
5N7497N
5N7"'OO N
5N7410 7N
5N704109N
SN704116N
$N7-n 21N
5N74122N
T.V.
74LSoo .25 74LS163 .95 7400 .19 74128 .55 CIRCUITS
8T26 1.69 3242 9.95
74LS01 .25 74LS164 .95 7401 .19 74132 .45
1.89
8T28 2.49 AY51013 3.95
74LS02 .25 74LS165 .95 7402 .19 74136 .50
1.29 8T95 .99 TR1602 4.95
74LS03 .25 74LS166 2.40 7403 .19 74141 .65
1.79 8T96 .99 IM6402 7.95
74LS04 .25 74LS168 1.75 7404 .19 74142 2.95
1.29 8T97 .99 1771 24.95
74LS05 .25 74LS169 1.75 7405 .22 74143 2.95
1.50 8T98 .99 1791 36.95
74LS08 .35 74LS170 1.75 7406 . .22 74144 2.95
.99
1488 .99 UPD765 39.95
74LS09 .25 74LS173 .80 7407 .22 74145 .60
1489 .99 8272 39.95
74LS10 .25 74LS174 .95 7408 .24 74147 1.75 .29
DM8131 2.95
74LS11 .35 74LS175 .95 7409 .19 74148 1.20 2.90
74LS 12 .35 74LS181 2.15 7410 .19 74150 1.35 2.99
74LS13 .45 74LS189 9.95 7411 .25 74151 .65
2.413
74LS14 1.00 74LS190 1.00 7412 .30 74152 .65
74LS15 .35 74LS191 1.00 7413 .35 74153 .55
74LS20 .25 74LS192 .85 7414 .55 74154 1.40
74LS21 .35 74LS193 .95 7416 .25 74155 .75
74LS22 .25 74LS194 1.00 7417 .25 74156 .65
74LS26 .35 74LS195 .95 7420 .19 74157 .55
74LS27 .35 74LS196 .85 7421 .35 74159 1.65
74COO .35 74C373 2."75 4018 .95 4093 .95
to s 74LS28 .35 74LS197 .85 7422 .29 74160 .85
74C02 .35 74C374 2.75 4019 .45 4099 1.95
74LS30 .25 74LS221 1.20 7423 .29 74161 .70
74C04 .35 74C901 .80 4020 .95 14409 8.95
t.
74LS32 .35 74LS240 1.85 7425 .29 74162 .85
74C08 .35 74C902 .85 4021 .95 14410 8.95
74LS33 .55 74LS241 1.85 7426 .29 74163 .85
74C10 .35 74C903 .85 4022 1.15 14411 9.95
74LS37 .55 74LS242 1.85 7427 .29 74164 .85
74C14 1.50 74C905 10.95 4023 .35 14412 12.95
to $1C
74LS38 .35 74LS243 1.85 7428 .45 74165 .85 74C20 .35 74C906 .95 4024 .75 14419 2.95
74LS40 .25 74LS244 1.75 7430 .19 74166 1.00
74C30 .35 74C907 1.00 4025 .35 4502 .95 rQ-ELEi
74LS42 .55 74LS245 2.85 7432 .29 74167 1.95
74C32 .50 74C908 2.00 4026 1.65 4503 .65
st elect
74LS47 .75 74LS247 .76 7433 .45 74170 1.65
74C42 1.75 74C909 2.75 4027 .65 4508 1.95
74LS48 .75 74LS248 1.25 7437 . .29 74172 5.95
74C48 2.10 74C910 9.95 4028 .80 4510 .95
dellvers 74LS49 .75 74LS249 .99 7438 .29 74173 .75
74C73 .65 74C911 10.00 4029 .95 4511 .95
74LS51 .25 74LS251 1.30 7440 .19 74174 .89
74C74 .85 74C912 10.00 4030 .45 4512 .95
runs OL 74LS54 .35 74LS253 .85 7442 .49 74175 .89
74C76 .80 74C914 1.95 4034 2.95 4514 1.25
74LS55 .35 74LS257 .85 7443 .65 74176 .89 74C83 1.95 74C915 2.00 4035 .85 4515 2.25
ry page
74LS63 1.25 74LS258 .85 7444 .69 74177 .75
74C85 1.95 74C918 2.75 4040 .95 4516 1.55
74LS73 .40 74LS259 2.85 7445 .69 74178 1.15 74C86 .95 74C920 17.95 4041 1.25 4518 1.25
with ell
74LS74 .45 74LS260 .65 7446 .59 74179 1.75
74C89 4.50 74C921 15.95 4042 .75 4519 1.25
ment y
74LS75 .50 74LS266 .55 7447 .69 74160 .75
74C90 1.75 74C922 5.95 4043 .85 4520 1.25
74LS76 .40 74LS273 1.65 7448 .69 74181 2.25
74C93 1.75 74C923 5.95 4044 .85 4522 1.25
iss. Mal 74LS78 .50 74LS275 3.35 7450 .19 74182 .75
74C95 1.75 74C925 6.75 4046 .95 4526 1.25
74LS83 .75 74LS279 .55 7451 .23 74184 2.00
74C107 1.00 74C926 7.95 4047 .95 4527 1.95
ry ISSl 74LS85 1.15 74LS280 1.98 7453 .23 74185 2.00
74C150 5.75 74C927 7.95 4049 .55 4528 1.25
74LS86 .40 74LS283 1.00 7454 .23 74186 18.50 74C151 2.25 74C928 7.95 4050 .55 4531 .95
ney-sa' 74LS90 .65 74LS290 1.25 7460 .23 74190 1.15
74C154 3.25 74C929 19.95 4051 .95 4532 1.95
74LS91 .89 74LS293 1.85 7464 .39 74191 1.15
74C157 1.75 74C930 19.95 4053 .95 4538 1.95
et all t
74LS92 .70 74LS295 1.05 7465 .39 74192 .79
74C160 2.00 4000 .35 4060 1.45 4539 1.95
74LS93 .65 74LS298 1.20 7470 .35 74193 .79
74C161 2.00 4001 .35 4066 .75 4543 2.70 mont
74LS95 .85 74LS352 1.55 7472 .29 74194 .85
74C162 2.00 4002 .25 4088 .40 4555 .95
74LS96 .95 74LS353 1.55 7473 .34 74195 .85 74C163 2.00 4006 .95 4069 .35 4556 .95
74LS107 .40 74LS363 1.35 7474 .35 74196 .79
74C164 2.00 4007 .29 4070 .35 4581 1.95
74LS109 .40 74LS365 .95 7475 .49 74197 .75
74C165 2.00 4008 .95 4071 .30 4582 1.95
74LS112 .45 74LS366 .95 7476 .35 74198 1.35 74C173 2.00 4009 .45 4072 .30 4584 .95
74LS113 .45 74LS367 .70 7460 .59 74199 1.35
74C174 2.25 4010 .45 4073 .30 4565 .95
74LS1 14 .50 74LS388 .70 7481 1.10 74221 1.35
74C175 2.25 4011 .35 4075 .30 4702 12.95
74LS122 .45 74LS373 1.85 7482 .95 74246 1.35
74C192 2.25 4012 .25 4076 .95 4724 1.50
74LS123 .95 74LS374 1.80 7483 .50 74247 1.25
74C193 2.25 4013 .45 4078 .30 80C07 .95
74LS124 2.99 74LS377 1.45 7484 .50 74248 1.85
74C195 2.25 4014 .95 4081 .30 80C95 .85
74LS125 .95 74LS378 1.18 7485 .65 74249 1.95
74C2OO 5.75 4015 .95 4082 .30 80C96 .95
74LS126 .85 74LS379 1.35 7486 .35 74251 .75
74C221 2.25 4016 .45 4085 .95 80C97 .95
74LS132 .75 74LS385 1.90 7469 4.95 74259 2.25
4017 1.15 4086 .95 80C98 1.20
74LS136 .55 74LS386 .65 7490 .35 74265 1.35
74LS137 .99 74LS390 1.90 7491 .40 74273 1.95
74LS138 .75 74LS393 1.90 7492 .50 74276 1.25
74LS139 .75 74LS395 1.65 7493 .49 74279 .75
74LS145 1.20 74LS399 1.70 7494 .65 74283 2.00
74LS147 2.49 74LS447 .37 7495 ' .55 74284 3.75
TRANSISTORS
74LS148 1.35 74LS490 1.95 7496 .70 74285 3.75
4 posit ion .85
74LS151 .75 74LS668 1.69 7497 2.75 74290 .95
5 posi t i on .90 PN2222 10/1.00 100/8.99
74LS153 .75 74LS669 1.89 74100 1.00 74293 .75
6 posit i on .90
2N3904 10/1.00 100/8.99
74LS154 2.35 74LS670 2.20 74107 .30 74298 .'35
2N3906 10/1.00 100/8.99
74LS155 1.15 74LS674 9.65 74109 .45 74351 2.25
7 position .95
2N3055 .79 10/6.99
74LS156 .95 74LS682 3.20 74110 .45 74365 .65 8 position .95
IN4148 25/1.00
74LS157 .75 74LS683 2.30 74111 .55 74368 .65
CONNECTORS
IN4oo4 10/1.00
74LS158 .75 74LS684 2.40 74116 1.55 74367 .65
74LS160 .90 74LS685 2.40 74120 1.20 74368 .65
RS232 MALE 74LS 161 .95 74LS688 2.40 74121 .29 74376 2.20
74LS 162 .95 74LS689 2.40 74122 .45 74390 1.75 RS232 FEMALE
,141sSI
74123 .55 74393 1.35 RS232 HOOD
ff neW55
74125 .45 74425 3:15 S100 ST
74126 .45 74426 .85
S1ooWW
,281sSI
74490 2.55
LM301V .34 LM741V .29 ooff ne'
LM308V .98 LM747 .79
74500 SERIES
LM309K 1.49 LM748V .59 2 issues
LM311 .64 LM1310 2.90
ff newss
LM317T 1.95 MC1330 1.89
74SOO .44 74574 .69 74S163 3.75 745258 1.49 LM317K 3.95 MC1350 1.29
24 Issue
74502 .48 74585 2.39 745168 4.65 745260 1.83 7005T .89 7905T .99 LM318 1.49 MC1358 1.79
74503 .48 74586 1.44 745169 5.44 745274 19.95 7OC6T .99 79121 .99
LM323K 4.95 LM1414 1.59 off new
74504 .79 745112 1.59 745174 1.09 745275 19.95 78121 .89 7915T 1.19
LM324 .59 LM1458V .69
74505 .79 745113 1.98 745175 1.09 745280 2.90 7815T .99 7924T 1.19
LM337K 3.95 LM1488 1.39
.00 per v 74508 .48 745114 1.50 745181 4.47 745287 4.75 7824T .99
LM339 .99 LM1489 1.39
74509 .98 745124 2.77 745182 2.95 74S288 4.45
LM377 2.29 LM1800 2.99
$7.50 per '
74510 .69 745132 1.24 745188 3.95 745289 6.98 7005K 1.39 7905K 1.49
LM380 1.29 LM1889 2.49
I .
74511 .88 745133 .98 745189 14.95 74S301 6.95 7812K 1.39 7912K 1.49
74515 .70 745134 .69 745194 2.95 745373 3.45 7815K 1.39 LM386V 1.50 LM3900 .59
a new sut
74520 .68 745135 1.48 745195 1.89 745374 3.45 LM555V .39 LM3909V .98
, extendi n
74522 .98 745138 1.08 745196 4.90 74S381 7.95 78l.O5 .69 79l.O5 .79 LM556 .69 LM3914 3.95
74530 .48 745139 1.25 745197 4.25 745387 5.75 78L12 .69 79L12 .79 LM565 .99 LM3915 3.95
74532 .98 745140 1.45 745201 14.95 745412 2.98 78L15 .69 79L15 .79 LM566V 1.49 LM3916 3.95
en
74537 1.87 745151 1.19 745225 8.95 745471 9.95
LM567V 1.29 75451V .39
se print) 74538 1.68 745153 1.19 745240 3.98 745472 16.85 LM309K 1.49 LM323K 4.95 LM723 .49 75452V .39 0
74540 .44 745157 1.19 745241 3.75 745474 17.85 LM317T 1.95 LM337K 3.95
LM733 .98 75453V .39
Z 74551 .78 745158 1.45 745251 1.90 745482 15.60 LM317K 3.95
0
74564 .79 745161 2.85 745253 7.45 745570 7.80
T=TQ.22Q K=TQ.3 L=TQ.92 T= TO220 V= 8 PI N K=TO-3
a::
74565 1.25 745162 3.70 745257 1.39 745571 7.80
I-
0
W
--I
W
I
0
15
-c
a::
98
CIRCLE 63 ON FREE INFORMATION CARD
del ivery
--..
8202
8205
8212
8214
8216
8224
8226
8228
8237
8238
8243
8250
825 1
8253
8253-5
8255
82555
8257
8259
8272
8275
8279
82795
8282
8283
8284
8286
8287
8288
8289
1\100 100pcs
.13 .11
.15 .12
.17 .13
.20 .18
.29 .27
.30 .27
.30 .27
.40 .32
40 pin ST .49 .39
ST=SOLDERTAIL
8 pin WW .59 .49
14 pi n WW .69 .52
16 pin WW .69 .58
18 pin WW .99 .90
20 pin WW 1.09 .98
22 pi n WW 1.39 1.28
24 pi n WW 1.49 1.35
28 pi n WW 1.69 1.49
40 pi n WW 1.99 1.80
WW=WIREWRAP
6.95
11.95
37.95
4.60
4.95
4.95
9.95
16.95
14.95
42.95
44.95
29.95
15.95
4.75
5.75
10.95
11.95
25.95
6.95
2.95
6.95
12.95
6.95
8.95
4.95
9.95
14.95
14.95
zao
ZaoA
ZaoB
Z80P10
ZaoAPIO
Z80CTC
Z80ACTC
Z80DART
zaoADART
zaODMA
ZaoA DMA
ZaoSIO/O
ZaoA SIO/O
zaOS10/1
ZaoAS10/ 1
zaoS10 /2
ZaoAS10/2
Z80SI0 f9
Z80ASI0 f9
16.95
19.95
3.95
12.95
99.95
39.95
11.95
11.95
29.95
39.95
39.95
69.95
49.95
PLUG IN SLOT (/J
GOLD PLATED CONTACTS
INCLUDES 5 JUMPEROPTIONS
INCLUDES5 RAM-ROMOPTIONS
ENJOY THE BEST OF BOTH WORLDS
16K RAM (RANDOM ACCESSMEMORY)
THIS IS SOPHISTICATEDFIRMWARE
EXPANDS YOUR 48K APPLE TO 64K
OF PROGRAMMABLE MEMORY
ELIMINATESTHE NEEDFOR APPLESOFT' OR INTEGER BASIC ROM CARD
ALLOWS YOU TO RUN APPLE'SNEW FORTRAN PACKAGE ALSO PASCAL
AND PILOT
KEYBOARD CONTROL SELECTION OF RAM OR MOTHERBOARD ROM
LANGUAGE
INCLUDES: INSTALLATION INSTRUCTIONS AND APPLICATIONS NOTES
THE SOF-TWARE DEVELOPEDBY VARIOUS VENDORSFORYOUR (64Kl
SHOULD NOW WORK AS THEY ADVERTISED
THE MOST VERSATILE RAM EXPANSION ON THE MARKET TODAY
UNIQUE 1 YEAR WARRANTEEII $1 68.00
SUPER FAN II
"COOL IT"' ~
TANCOLOR ~
SAVE DOWN TIME #
LONG LIFE MOTOR ,.
LOW NOISEIS A MUST \ ...
SAVE REPAIR CHARGES ~ t i
~ L ~ : ~ ~ E ~ ~ ~ L ~ ~ ~ ~ ~ R SCREWS ---------------
MINIMUM QUIETNESS IS DUETO THE DRAW EFFECTOF AIR THROUGH
YOUR COMPUTERAND A SPECiAl FAN AND MOTOR DESIGN
THOSE EXTRA PLUG-IN CARDS CAN CAUSE EXTRA HEAT
HOW TO HOOK IT UP
Clipit on your APPLE
Unplug your 120V cable (you won't need it)
Plug short 120V cable from Super Fan II to the back of your computer
Plug the supply cable from Super Fan II to your 120V power source
Turn on the rocker switch and a built-in red ready light comes on
6. You are all set "COOL IT'"
UNIQUE 1 YEAR WARRANTEElI $69. 00
APPLE IS A TRADEMARK OF APPLE COMPUTER INC.
4027 (250n5)
4116150 (150n5)
4116200 (200n5)
4116300 (300n5)
4164 (200n5)
4.95
3.95
6.95
9.95
12.95
9.95
21.95
17.95
EPROMS
256x8 ( 1U5)
1024 X 8 (450n5)
(5v) 2048 X 8 (450n5)
(5v) 1024 X 8 (450n5)
(5v) 2048 X 8 (350n5)
2048 X 8 (450n5)
(5v) 4096 X 8 (450n5)
(5v) 4096 X 8 (450n5)
PROMS
745188 (82523) DC 32 x 8
745287 (825129) T5 256 X 4
745288 (825123) T5 32 X 8
745387 (825126) DC 256x4
745471 T5 256 X 8
745472 (825147) T5 512 X 8
745474 (825141) T5 512 X 8
745570 (825130) DC 512 X 4
745571 (825131) T5 512 X 4
1702
2708
2716
2758
27161
TM52
716
TM52532
2732
100pcs
1.85
.85
1.15
2.49
2.79
2.25
2.45
2.45
2.25
3.25
3.75
CALL
CALL
1.95
.89
1.29
2.99
2.99
8/18.95
8/22.95
8/21.95
8/18.95
3.49
3.99
CALL
CALL
(450n5)
(450n5)
(LP) (450n5)
(450n5)
(450n5)
(450n5)
(LP) (200n5)
(300n5)
(LP) (450n5)
(450n5)
(300n5)
(200n5)
(200n5)
LP =LOW POWER
2101
21021
21L021
2111
2112
2114
2114L2
2114L3
2113L4
40444
40443
TMM2016
MB6116
:>
c
o
c
en
-l
......
(0
CO
......
CIRCLE 63 ON FREE INFORMATION CARD
99
$32.00
856.00
$32.00
$32.00
$56.00
$56.00
$48.00
$48.00
$37.00
$37.00
$66.00
$66.00
For use with APPLE II'-or OUR PRICE
modified to run with other
parallel parts
TRS-80 Mooel I compatable.
complete with interface cable
and ACAdapter, less
enclosure
Sectoring
Soft Sector
Soft Sector
MMI-94VOAPL
MMI-94VOTRSI
VRB-M0577-01
VRB-MD557-01 Soft Sector
# of
Application heads Box/ l0
TRS80 Apple
40 Track Cert
VRB-MD525--1D Hard 10 Sector North Star
40 Track Cert.
VRB-MD525-16 Hard 16 Sector Micropolis
40 Track Cert .
77Track Cert
100TPI
VRB-M0557-10 Hard 10 Sector 77Track Cert
100TPI
VRB-M0557-16 Hard 16 Sector 77Track Cert
100TPI
77Track Cert
100 TPI
VRB-MD577-10 Hard 10 Sector 77Track Cert
100TPI
VRB- MD577-16 Hard 16 Sector 77Track Cert .
100 TPI 1 $48.00
VRBMO Series comes reinforcedhubrin9 mounted.
8" DISKETIES
VRB-FD32 Hard Sector Shugart BOI R
VRB-FD34 Soft Sector IBM 3740
VRB-F032-2 Hard Sector Flippy 1
VRB-F034-2 Soft Sector Flippy 1
Verbat im 8" Diskett es have all t he Dat afif e
Improvement s wit hout t he hardhole rei nfo rcement rfngs.
ALL VERBATIM DISKETTES AREDOUBLE DENSITYCERTIFIED
PB1 2708/2716 PROGRAMMER &
4K/8K EPROM BOARD
144 ex press ion vocabulary
Assembled and Tested
Complete Docu ment at ion
Co nnect to a speaker or Powe r Ampli fer
Plugs in t o Apple II
Plu g co mparable wit h TRS80 Model l
May be adapted t o run on the S100, H-8, or any
par al lel part.
SSMPBl K
SSMPB1A
PB1 has two separate progra mming ci rcuits so 2708 or
27 16 (5v) type of EPROMs can be pr ogrammed without
modifyi ng the boa rd. Programmi ng voltage is gene rated on-
boa rd; no need f or an exte rnal power supply. Prog ramming
sockets are Dip Switch addressable t o any4K boundary. And
co mplete softwa re is provided for prog ramming and verify-
ing EPROMs.
Unused EPROM sockets don't take memory space, so you
are never commi tted to the fu1I4K or 8K 01 memory.
Li st Price Our Pric e
Kil 517 9.00
Assembled & tesiec 526500 5230.00
$8.50 EA.
8/$32.00
$11.95 EA
8/$48.-00
450ns 8K
EPROM
450ns 5 Volt only
16 KEPROM
2716
2708
6 OUTLET
MULTI USE
CORD REEL
SH. WT. 5 LBS.
THE CONVENI ENCE OF
AN EXTENSION CORD AND POWER
DI STRIBUTION PANEL IN ONE
COMPACT, SELF -STORING UNIT!
SIX GROUNDED 3-PRONG OUTLETS!
7 M (22 FT. or 50 FT.) 14 GAUGE,
3-CONDUCTOR POWE R CORD - RATED FOR
INDOOR/OUTDDOR USE!
CIRCU IT BREAKER FOR SAFETY'S SAKE -
GUARDS AGAINST OVERLOADS ABOVE 10
AMPS
INDESTRUCTIBLE SPACEAGE PLASTIC CAS E
DESIGN ED FOR YEARS OF HEAVY IJSE!
GOFCR21 22 Ft. - 5 Ibs ' , $24.95
GOF-CR50 50 ft. - 10 Ibs $39.95
PROTECT YOUR INVI!6TMENT
PROTECT YOUR DATA WITH
I

GOFIBAR46
Inductively isolatedgrounds
Sockets individually filter isolated
Each socket isolated from power
line LIST PRICE $79
95
SALE PRICE $39
95
2016P3
2Kx8 LIP STATIC RAM
8/$100
00
21143L
52573L
(TMS 4044)
4096 BIT (1024x4) 300ns 4096x1 300ns
LOW POWER STATIC RAM LOW POWERSTATICRAM
8/$30
00
8/$5000
100 + $3
00
100 pes. + $4
75
3.25
Price
$19.95
100249
List Price SALEPRICE
8199.00 $129.00
4.00 3.75 3.50
3.20 2.90 2.50 2.20
WIRE WRAP PRICE
1-9 10-24 25-99
GOLD S-100 CONNECTORS
SOLDER TAIL PRICE
1-9 10-24 25-99 100-249 Pari No ,
DESCRIPTION PRICE
19 1024 2599
CNDDE9P 9 PINMALE $ 2.10 $ 1.90 $ 1.70
CNDDE9S 9 PINFEMALE $ 2.70 $ 2.40 $ 2.10
CNDDE9C 9 PINCOVER $ 1.50 $ 1.25 $ 1.10
CNDDAI5P 15 PINMALE $ 2.75 $ 2.45 $ 2.15
CNDDAI5S 15 PINFEMALE $ 3.95 $ 3.60 $ 3.20
CNDDAI5C 15 PINCOVER $ 1.50 $ 1.30 $ 1.10
CNDDB25P 25 PINMALE $ 3.00 $ 2.75 $ 2.60
CND-DB25S 25 PINFEMALE $ 4. 00 $ 3.75 $ 3.50
CNDDB51212 I PC GREY HOOD $ 1.60 $ 1.45 $ 1.30
CNDP25H 2 PC. GREYHOOD $ 1.50 $ 1.25 $ 1.10
CND-DB51226 2 PC. BLACK HOOD $ 1.90 $ 1.65 $ 1.45
CNDDC37P 37 PINMALE $ 5.BD $ 5.10 $ 4.45
CND-DC37S 37 PIN FEMALE $ B.7D $ 7.70 $ 6.70
CNO-DC37C 37 PINCOVER $ LBO $ 1.55 $ 1.30
CNODDSOP 50 PIN MALE $ B.75 $ 7.75 $ 6.70
CND-DDSOS 50 PINFEMALE $11.65 $10.25 $ B.90
CNODD50C 50 PINCOVER $ 2.00 $ LBO $ 1.60
CNDD2041B HARDWARE SET 2 PR $ 1.00 $ OBO $ 0.70
CND-RS232BF $19.95 $17.95 $15.95
m5730360 $ 900 $ 7SO $ 600
THE STAR
MODEM
from
LIVERMORE
FEATURE
FIT S GT E HANDSETS!
2 YEAR WARRANTY
EXCLUSI VE ACOUSTIC CHAMBERS
The excl usive triple seal of Livermore's new tl atrnounted
cups locks t he handset into t he aco ustic chambe r yie lding
superio r acoustic i sol ati on and mec hanical cus hioni ng.
Desi gn ed to ada pt to most co mmo n h andset s used
thro ug ho ut the wor ld , the STAR offers th;:jiu t ost i n f lex -
i bi lity and transmission retiabi lity.
300 ba ud
Compatibility: Bell 103 and 113; CCITT
Fr equency Stabi l ity: 0.3 percent. Crystal co ntrol led
Rec ei ver Sensiti v it y: - 50 dBm ON, .- 53 dBm OFF
Modu lati on: Frequ ency shift keyed (FSK)
Carri er Det ect De l ay: 1.2 seconds ON; 120 msec OFF
EIA Termin al Int erf ace: Com patible with RS 232
specifications
Tel et ype In t erfac e : 20 mi lliampere current loop
Opti o nal Interfaces : IEEE 488 : TTL : TTY 43
In t ernational (CCITI) fr eq uenci es available
Sw it ches: Origi nate/Off /Answer: Full Duplex/ Test/ Half
Du plex
Indi c ator s: Ir ans rrut Dat a. Receive Data , Carner
Ready, Test
Power: Supplied by 24 VAC/ 150 MA UL/ CSA listed wall -
mou nt tr ansformer. Input 115 VAC. 2.5 watts. (A 220
VAC, 50 Hz adaptor is ava ilab le upon request.)
Dimens i ons: 10" x 4" x 2"
Wei g ht : 1.74 1bs. (3Ibs. sh ipping weight i ncludi ng AC
ad""tor.)
Warr an ty : Two years on pa rts and labor, excluding the
AC ada ptor which carr ies the manufacturer's warranty
MODEM SALE
$129.00
, PRIORITY ONE ELECTRONICS
9161-R DEERING AVE: CHATSWORTH, CA 91311 1
Ter ms U S , VISA. MC. BAC Ch eck , Mon ey Orde r. U S Fun ds Only CA resi dent s add 6% Sales Tax
MINIMUM PREPAID ORDER 515.00. Includ e MINIMUM SHI PPING & HANDLING of 52.50 f or t he fi rst
3 lbs.. p l us 25 f or each addit ional pound. Ord er s ove r 50 Ibs. se nt freight co l lec t. Just in
case ...pleas e i nc l ude yo ur phon e no. Pri ces SUbjec t to change wi t hout not ice. We wi l l do our best to
ma i nt ain prices thru JULY. 1981. SOCKET and CONNECTOR pr i ces based on GOLD. not exceedi ng
5700.00 pe r oz.
S.a.les Pr ices are fo r prepaid or ders only.
List Price
$310.00

SA801R
SA E
GBT143A
List $349.00
IEEE S100 COMPATIBLE SINGLEIDOUBLE DENSITY
5 '1." /8" DISK DRIVES
SINGLEII DOUBLE HEADED
ASSEMBLED & TESTED
CCS2810 ' Z80 CPU
2/4 MHZ CPU W/S.riall/O
$199.00
Oper at es up t o 10 MHZ (90 ns RAM Chips)
As sembl ed & Tes ted
Meet s or excee ds all IEEE 696/S1OO specifi cations
(inclUd ing timing).
Fully st at i c design eli mi nates t he timing pr oblems
associated with dynamic memori es.
Swit ch sel ect able choi ce of 24 address l i nes co ntor-
mlng to the IEEE 6961S1OO exte nded addressi ng
specifications, or 16 address l ines as used in ol der
S100 sys tems.
Ideal lor mu lti -user Inst all ati ons.
Board is addressable as one 16K x 8 bl ock on any
4K boundary.
Swit ch selec t able PHANTOM di sabl e and wri t e pr o-
t eet.
+5 Volt operati on (requi res no ot her sup ply
volt ages).
Low power opera tion (900 rnA typi cal, 1200 rnA max-
imum).
1 year Factory Warr anty .
California Computer Systems
CCS2422A SALE
FLOPPY DISK CONTROLLER $375 00
WITH CP/M VERSION 2.2
CCS2810 A&T
$475.00
$525.00
$575.00
$575.00
MX80 with Graphics option
MX80with both tractor and
friction feed
MX80 with high density
graphics option
VCT- '8801-1
Plain no etched circu itry except contacts.
Produces maximum fl exibility.
1-4 5-9 10-24
$15.67 $14.24 $12.82
EPNMX80V2
EPNMX80TF
EPN-MX82,
VCT-' S800V
Universal Microcomputer/processor
plugboard, use with S-1OO bus. Complete
with heat sink &Hardware. 5.3" x 10" x 1/ 16:'
1-4 5 -9 10-24
$22.48 $20.37 $18.26
Among It s l eatures, t he MX80 print s 96 ASCII, 64
gr aphi cs and B i nt ernati onal char acte r In tack -sharp 9x9
matri x. It pr int s bid i rectionally at 80 CPS wit h a logical
seeki ng fun cti on t o maxim ize all of t hese ca pabi l it i es.
And it has th e wo rl d's f i rst di sposabl e print head, wi th a
li l e expec tancy of over 50 million ch aracter s. When i t
wears out , just snap it out and throw it away ! A new on e
c ost s l ess than $30., and you ca n Install it
your self ...wlth on e hand.
The ' most revo l ut io nary t hi ng about he Epson MX80
isn 't the bid ir ectional printing or th e logical seeki ng
luncti on . it isn't even t he di sposabl e pri nt head
al t hough t hat 's pr ett y revolut i onary. The most revolu -
t ionary th ing about the MX80 i s the price.
EPN-MX80 MX80Tractor Feed
List $649.00
Slle Price
HITV352
35MHz DUAL TRACE
WITH DELAY
LIST PRICE:
SALE PRICE $950.CO
Economicall y priced
dual trace oscilloscope
Square CRT with internal
graticule (illuminated scale)
Hiqh-accuracyvoltage axis &
time axis set at 3% (certi
fled at 10' to 3S' C)
Highsensitivity l mV/div.
Low drill
2 Year Warranty
List $995.00
SALE $819.00
HITV202
20MHz DUAL TRACE
LIST PRICE: $850
SALE PRICE: $775.00
Dynamic range8 div.
TVsync-separator circuit
Builtin signal delay line
(V352)
XY operation
Sweep-time magnifier
(10 times)
Tracerotation system
Fineadj usting. click-pcsiticn-
ing function
50MHz & 100 MHz
DUAL TRACE WITH
CALIBRATED TIME DELAY
HIT V550B HIT V1050
50MHz with 100MHz with
3rd TRACE 3rd & 4th TRACE
TRIGGER VIEW TRIGGER VIEW
LIST $1745.00 LIST $2390.00
SALE SALE
CALL CALL
The HITACHI V550B (50mHz) and Vl050 (l00mHz) ot -
fer all the capabilit i es you might expec t from a lab
grade oscilloscope . Capabil ities such as 3rd tr ace trig
ger view, a bright 6 " square CRT, and a max. sweep rate
of 2ns/di v (Vl 050) 5nsl di v (V550B). Al so, featu res you
may not expect like, sensitivity of lmvldiv (V550B)
.5mvl di v (Vl05 0) @ 10mHz, automatic focus correction.
Hi tachi ...The measure of quality.
HITV302B
30MHZ
DUAL TRACE
OSCILLOSCOPE TVsync-separater circuit
Highsensivity l mV/ div
(5MHz)
,. Sweep-timemagnifier
(10 times)
Z-axis input
, (intensity modulation)
Signal delay li ne
Completewith 2 probes
CHI. CH2, OUAL. ADD.
DIFF. Vertical
Deflection Modes
XY operation
Trace Rotation
HITV152B DUAL TRACE 15MHZ (no delay)
LIST $735.00 SALE $629.00
SCOPE SALE EPSON MX-80 CompuPro Iran
OUR LOWEST PRICES PRINTERS ANOTHER FAMOUS
OF THE YEAR! PRIORITY 1 ELECTRONICS
TRUCK LOAD PURCHASE
Si ngle and d ual trace, 15 t h ru 100 MHz. All hi gh sen- 10 MHZ 16K A&r
sitivi ty Hit ac hi oscill osco pes are bui l t to demanding
Hit ach i qua l ity standards and are backed by a z-vear STATIC S.100 RAM
warranty. Th ey ' re able t o measure si gnals as low as
1mV/divi si o n (wi th X5 ve rti cal magni f i er). It's a
spec i fic atio n yo u won't l in d on any other 15 or 30 MHz
sco pes. Plu s: Zaxis modul ati on, tr ace rotat ion, front
panel XY operat ion f or all scope model s, and X10
sweep magn i f i cati on. And, 30 th ru 100 MH z
osci lloscopes offer i nte rnal s i gnal delay li nes. For ease
01 operation, t unctlonally -related con tro ls are grouped
i nto thr ee bl oc ks on the co lor coded fr ont panel. Now
here' s the c li nc her: For wha t YOU'd expect to pay more,
you ac tuall y pay less. Ch ec k our scopes bef or e yo u
decid e. All scop es compl et e wi th prob es.
Price
$21.85
83.43
160.45
$3.49
HOBBY
WRAP
TOOL
BW263
Vacuum Vice
Part No. Description Price
INS1416 14-16 pin Insert er $3.49
MOS1416 14-16 pin MOS Safe
Insert er 7.95
MOS2428 24-28 pin MOS Saf e
Insert er 7.95
MOS40 40 pin MOS Saf e
Inserter 7.95
EXl 14-16 pin
IC Extracto r 1.49
EX2 2440 pin
IC Extractor 7.95
Auto -Index ing
o Anti-Overwrap
o Modi fied Wrap
Part No. Description Price
BW2630 Tool $19.85
BT30 #30 Bit (not incl.) 3.95
BT2628 #28 Bit (not incl.) 7.95
BCl Batteries & Charger 14.95
VVl
.1'l'I'!-__....WK-7 IC
- INSERTION K
Comp lete IC In-
ser ter / Extr actor
Indi vidual Com-
ponents (listed
. above) $22.95
IC DISPENSER
VACUUM VISE
INSERTIONI EXTRACTION
TOOLS
Allows IC's to be di s-
pensed from the i r t ube 1
at a ti me and picked up
by inserti on too ls above.
o Dispenses 8-42 pin
iC's 0 Compatable wit h
all IC carryi ng t ubes 0
Use with WK7 for MOS
safe insertion. 0
Part No. Description
MDDl 1 Chan. Dispe nser
MDD5 5 Chan. Dispenser
MDD10 10 Chan. Dispenser
"No Discount.
Unique vacuum-based
li ght duty vise for
precision handling of
small components and
assemblies. Rugged
ABS const ruction. 1%" (32mm)
t ravel for max imum versat il ity . Also
feat ures screw lugs for permanen t
install at ion.
Price
$1.69
2.59
3.49
3/1.79
$48.95
Description
4-Pole
8-Pole
12-Pole
2-Pole Int erlocking
PSL1
Compat ible with all logic fami li es us-
ing a 4 to 15V power supp ly.
Thres holds automat ica lly programm-
ed. Visual indicati on of log ic level s to
show hi gh, low, bad level or open cir-
cuit logic pulses .
010 N sec. pulse respo nses
0120 K input impedence.
-Autornat lc resetti ng memory.
-I nct udes ti p with protect ive cap &
coiled cord.
PRB1 $36.95
LOGIC PULSER
Superimposes a pulse tra in (20 pps ) or
a sing le pulse onto the circu it node
under test without un-soldering IC's .
o Automatic polarity sens ing
o 2 us pulse width
o Finger tip push button actuated
Include s t ip wit h protective cap &
coi led cord .
PRODUCTS
LOGIC PROBE
P.C.B.
TERMINAL
STRIPS
The TS st nps provide '
posit ive screw activated
clamping act ion, accorn-
modate wire sizes 14-30 AWG (1,8-0,
25mm). Pins are solder plated copper,
.042 inch (1mm) diameter, on .200 inch
(5mm) centers.
Part No.
TS- 4
TS- 8
TS-12
TS6MD
DESOLDERING
PUMP
Easy one hand
operat ion .
Rugged all met al
const rue ti on.
Replaceable
Tip. Self
cleani ng on each st roke.
Suct ion precisely regulated for reliabl e
deso lder i ng without damage to del icate
circuit ry.
DSPI Desol deri ng Pump $9.95
2.98
4.98
1.98
2.49
Price
$4.98
Price
$6.95
7.95
Slip ped onto
socket before
wrapping to
identi f y pins.
o .025
(0,63mm)
Square Post
o 3 Level
Wi re-
Wrapping
o Gold Plat ed
25 PER PKG.
TERMINALS
Description
Regul ar
Modif ied
JUST WRAP KIT
Just Wrap too l for
daisy chain wi ri ng.
Tool strips as it
wraps and cuts.
Incl udes one 50 f oot
spoo l of wire.
IIIIT..
INS 1
Part No.
WSU30
WSU30M
Part No. Description Price
JW-l " Just Wrap Tool $14.95
JWK-6 Tool w/4 Spool s and
JUWl 24.95
RJW" 50 Ft. Repl acement
Wir e 3.49
JUWl Unwr apping Tool 3.49
Speci fy Color: Red, Bl ue, White or
Yellow.
SOCKET WRAP - 10
a 9 e 7 6 , , 2 1

Bulk Bulk
Part # Price Price Part # Price Price
1410 1.49/10 5.501100 2210 1.49/5 5.95150
1610 1.4911 0 5.95/100 2410 1.49/5 5.95150
1810 1.49/10 5.00/50 2810 1.49/5 6.50150
2010 1.49/5 5.00/50 4010 1.49/5 5.00/25

1IW'l-4
Part No. Description
WWT-l Slotted Termin al
WWT-2 Singl e Sided
Termin al
WWT3 IC Socket Term.
WWT-4 Doubl e Sided
Terminal
Inserti on Tool for
above
ColorCoded
10ft. 100ft.
4.00 30.00
5.00 42.00
5.60 48.00
7.00 60.00
8.00 72.00
8.60 78.00
11.00 102.00
13.00 120.00
16.00 150.00
SolidColor
10It. 100It.
2.90 17.00
3.40 23.80
3.70 27.20
4.40 34.00
5.00 40.80
5.40 44.20
6.80 . 57.80
7.80 68.00
9.50 85.00
SOCKETS
Size Part No. Price
10 10510B $1.88
20 10520B 2.75
26 10526B 3.50
34 10534B 4.50
40 10840B 5.40
50 10550B 6.50
RIBBON CABLE
.1" 5pacing. Crimps onto cab le with
ordi nar y vise & mounts to header sold
above .
Size
10
14
16
20
24
26
34
40
50
DISCOUNT SCHEDULE
Amount Discount and the name of
Net this magazine must be men-
less 10% t ioned at time of order to get
less 15% discount. Discount applies
less 20% on all items except as noted ,
less 25% "No Discount."
$3.95
4.35
5.00
6.05
6.90
7.50
Order
$15 - 99
100 199
200 - 499
500 - 999
1000 up
IDE10B
IOE20B
IOE26B
IOE34B
IOE40B
IOE50B
IDe CONNECTORS
WIRE KITS
Kit No.1 $9.95
250 3" 100 4
'
/z"
200 3'12' 100 5"
100 4" 100 6"
Kit No.2 - $24.95
250 2% " 250 5"
500 3" 100 5'12'
Size Part No. Each Tube
500 3'12' 100 6"
500 4" 100 6%"
08 ICN083WBSG .44 52x .39= $20.28
250 4'12' 100 7"
14 ICN1 43WBSG .53 30x .46= $13.80
16 ICN163WBSG .58 26x .50= $13.00
Kit No.3 - $34.95
18 ICN183WBSG .78 23x .68 = $15.64
500
20 ICN203WBSG 1.00 21x .85= $17.85
250 2%" 4%"
22 ICN224WBSG 1.07 19x .92= $17.48 500 3" 500 5"
24 ICN246WBSG 1.09 17x1.09=$15.98 500 3'12' 500 5'12'
28 ICN286WBSG 1.43 15x1.23= $18.45
500 4" 500 6"
40 ICN406WBSG 1.85 10x1.60= $16.00
Kit No.4 - $59.95
Selective Plating provides gold in contact
500 2%" 1000 4'12'
where it counts. 3level wrap. Saveby buy-
ing sockets by the tube. All gold available at
1000 3" 1000 5"
'I2/pin extra charge. 1000 3%" 1000 5'12'
1000 4" 1000 6"
.
No Discount
Size Part No. Price
14 IOP14B $1.45
16 IOP16B 1.65
24 IOP24B 2.50
40 IOP40B 4.15
.1" Spacing. Cr imps onto cab le with
ordi nary vis e & plugs int o standard IC
Soc ket.
WIRE WRAP SUPPLIES
CABLE PLUGS
.1" Spacing. Crimps onto cable wit h
or dinary vi se & mat es with standard
.062" Card Edge.
EDGE CARD CONNECTORS
Size Part No. Price
10
20
26
34
40
50
Price
$2.95
3.95
1.50
Part No.
DB25P
DB255
DB25C
Solder Style
Male
Female
Cover
ORDERING INFORMATION
Prepaid orders over $50 shipped prepaid via
UPS. All others add $3.00 for handling. VISA,
MC, COD's and open account orders will be
charged freight. $15 minimum order. $100
minimum open account order.
"
25 PI N "0" CONNECTORS
IDC Styl e
Ma le IDB25P 6.25
Femal e IDB255 6.60
Cover IDB25C 1.60
Solder Sty le solders ont o cable, IDC
St yle crimps onto cable wi t h vise. 9,
15, 37 and 50 pin available also.
WIRE WRAP WIRE
#30 Wire Wrap Wir e
Length 1001Bag 500/Bag 1KlBag
2.5" $1.38 $6.81 $3.94
3.0" 1.43 7.46 4.25
3.5" 1.51 8.11 4.57
4.0" 1.56 8.73 4.88
4.5" 1.63 9.39 5.21
5.0" 1.69 10.04 5.54
5.5" 1.74 10.69 5.92
6.0" 1.82 11.34 6.23
6.5" 2.11 12.99 7.08
7.0" 2.19 13.68 7.44
7.5" 2.29 14.40 7.78
8.0" 2.35 15.10 8.12
8. 5" 2.40 15.80 8.46
9.0" 2.46 16.51 8.92
9.5" 2.53 17.22 9.15
10.0" 2.63 17.91 9.58
All lengths are overall , i nc l uding 1" strip
on each end. Choos e fr om colors; Red,
Blue, Black, Yell ow, White, Green,
Orange, and Vi olet.
RIGHT ANGLE HEADERS
SOLDERTAIL WIREWRAP
Size Part No. Price Part No. Price
10 IDH10SRB $1.20 IDH10WRB $2.60
20 IDH20SRB 1.90 IOH20WRB 4.15
26 IDH25SRB 2.75 IDH26WRB 5.35
34 IDH34SRB 3.75 IDH34WRB 6.25
40 IDH40SRB 3.75 IDH40WRB 7.35
50 IDH50SRB 4.75 IDH50WRB 9.20
.1" Spacing. Mounts on PC Board & Mates
with IDSSocket below. Ejector Bars 4/1.00.
QlliJ
o 0 . __
IC SOCKETS
8 PIN 10/1.20
14 10/1.40
16 10/1 .60
18 10/1 .90
20 10/2.80
22 1012 .80
24 1012 .80
28 10/ 3 .80
40 10/4.75
9745
((1981
I.C.Master
$ .5
MSM5832 MICROPROCESSOR REAL-TIME
CLOCK/CALENDAR
GENERAL DESCRIPTION

_"' ' _0<.._ _ " _' T ' ..
..,......',,'<O"'._ ... ........ _ w..... ._, do ... '0
= :.. I. .,
< _._t>y .""."" 1>_, .....
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" _ " "" I."", T"' ... ...\.a11
.. _-.l..,"'.'..4 1 ' ... ...e l>l. .. ".,p.a' ._
p ,
"
Logic Probe Kit.
L $1795 Compl e t e , e y- to -
f. lI.w ' ns " uc " . ns
_____. .-J . "
$16. 15each BUY 5 FOR
3
1
h-Digit 0.1% Digital Multimeter
(
\ Capacitance Meter A portabier
J
Model 3001 $23375 bench-type
-=====- Model meter
Function Generator rrzn
Model 2001 $157 95
Proto Boards


Fully assembled
$59
95
INCORPORATED
,
",
H".
J:'
I ,
Service a
Master
Tool Kit. .'
$49
95
Model 99SM
APPLE CAR
SERIAL-- 1
159
DO
CARD .
PARALLEL-- 19901
CARD .
IUEGERDI I
AlPLESOfT -- 189."
CARD
PASCAL
SYSTEM -- 425.11
PROTO __ I
BOARD 25
11
l M5Dl l amp t.loClule Sl' t95
AM601Allll ',ancI" Modulf: S13S<;
WS7D' ... WI S 'lCh Module S13,9S
WS711\'iall S 'lChMoou1e
" ,!h ,noependent OnOI1
POl.eroo tlon\ 515. 95
m-MihM 15' MHz Miniscope
Rise time 11.7 nSor , .. ,
less. Built-in signal I I C)
delay line . Flat
response
1
!
' f '
; t _
- : : 't : :-
. : :: ': t t: 1
FIDELITY Sensory Chess
Chess Challenger 7 Challenger$110.
$79
95
Voice Sensory
Challenger .
..J.' _

Soldering Finds faulty components
Iron . . quickly andeasily
$2995 '.' d Model $29
95
Model
.' 7BOO 5800
48k-$1199.00
64k-$1399.
0 0
W/PURCHASE OF
APPLE RECEI VE
SPECIAL PRICI NG:
8ASE II PR INm-- *619.
DO
DISK II l /co nt.-- Im .
DO
DI SK11 1'0cont .... 'm.
DD
Al
SUP'R'MOD 11 -- ' m O
MDNlTDR:B&W "
12" - 12MHz.
INTE GERBASIC
CARD---- IIG9.DD
()\PPLE II Plus
video
F;j0_J.
12 .........
S365.o
o
13"
I . 01 boMI c..:c- ..... one ...
Green Phos ._-""""*'
12 inch
LOWCOSTVIDEO I. MICROSOFT
MONITOR s/5500
----. - .... 16K RAM
New for the CARD
APPlE $1 59.95
HICKOK DIGITAL MULTI METERS

s::::r
' .1 {Jfe;;, .' .

Model
DMM ' M d I LX304
+Vari.-Pilch $210 $79
50
+Logl-Trax $69
50
MX-333
\lIZ Tech DMM 3Y2- J IrJn ..
r
Digit LCD Readout Il I
Model WO 747 $7995 . ' . .
Beckman DIGITAL MULTIMETERS

Model TECH300$109
95
Model TECH 310$140
00
. Model TECH 330$199
95
DIGITAL MULTIMETERS
rt1QdeI 462 Model 463 .. \ .
$199
95
$16995\ . .. ... , I

Model 2607
$96.
charger/adapter test
leads
104 ....
C/)
Q
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o
II:
t-
O
W
....J
W
(,
Ci

II:
r.IRr.I.E!ilI ON FREE INFORMATION CARD
&ILLII ILICIIICI
P.O. BOX 401244R
GARLAND, lX. 75040
214 278-3553

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...
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10S
1.15
.75
.95
116
.95
t60
.65
65
1.75
.75
.75
.75
741S155
741S158
74LS160
74LS161
74LS162
74LS163
74LS164
74LS165
741S170
74LS174
74LS175
74LS190
74LS193
74LS195
74LS196
74LS221
741S240
74LS241
74LS243
74LS244
74LS245
74LS253
74LS257
74LS2S8
74LS259
74LS2711
74LS283
74LS293
74LS296
74LS386
74LS387
74LS368
74LS373
74LS374
74LS386
.211
.28
.26
. .211
.28
.28
.211
.211
.28
.211
.49
.28
.28
.32
.32
.115
.78
25
.35

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.4r;..

.48
iDs
119
.44
.44
1.05
.50
.48
.60
.70
.39
.95
.69
.65
.65
1.25
.80
.119
.95
.115
.85
.87
.87
.95
.119
.75
1.15
1 Q
8.95
12.50
12.50
129.00
11.50
12.50
9 .50
The Greatest Breakthrough
In Electronic MUllic Ever!
The
Super Music
Maker
REVISION 2
SZ4.9S
(Basic Kil)
Does no r Incl ude speaker
SWitche s or 2708 ROM
Now you can play hundreds of songs using the Bulle t Super
Music Maker . The unit features 8 single factory
programmed microprocessor Ie thaI comes wit h 20 pr e-
programmed short tunes. By adding the addi ti onal PROMS
(2708's) t he system can be expanded to pl ay up to 1000
nol es per PROM. Just think . . a compact elect roni c
inst rument that will pl ay dozens. hundreds or even
thousands of select i ons of music. The kit comes with all
elect ronic component s (less the PROM) , and a drilled.
plat ed and screened PC Board which measures 4" x 4. ".
The 1 watt ampli fi er secti on i s on the same PC board and
drives an 8 ohm speaker (not included ), from a whisper t o
ear splitti ng volume. Since the Uni t works on 12 vec or 12
VAC., vehi cle or portable operati on is possible. What do
you get for $24.951 Everything but a . peaker, transformer,
case. switches, and PROM. Add it ional 2708 album s
con taining popul ar t unes are avai lable for $15 .00 each or
you can program your own PROMS using inf ormation
pro vided wit h t he kit i nstructio ns. Lists of available PROM
albums are available on request. (Note: Unit plays
elec tron ic music one no te at a time. it is no t possible to play
chords or a melody Wit h harmony sImultaneously.)
* Envel ope cont rol gives decay to notes.
* " Next tune" featur e allows sequent ial playing of all song s.
* On board inverter allows si ngle voltage (+12) operatio n.
OPTIONAL ACCESSORIES
DIP Switches One 8 pos., One 5 pas. 2.00/Set
(Can be dir ectly sol dered to PC Bd. to access tun es)
Rotary Switches Two 5 position 2.50/Set
(For remot e wiring to PC Bd. t o access tunes)
Attractiv e Plastic Cas. 6.50
WaUplug Transformer 3.00
(For operat ion on 117VAC house voltage)
CPUs
. 20 SN7482N
.22 SN7492N
.22 SN7493N
.24 SN7495N
.22 S)l7496N
.28 SN74122N
. 35 SN74138N
.49 SN74141N
.29 SN74151N
.29 SN74 153N
. 2B SN74154N
SN74155N
.23 SN74157N
. 29 SN74160N
24 SN74161N
22 SN74163N
57 SN74164N
.78 SN74165N
78 SN74174N
20 SN74175N
20 SN74180N
32 SN74181 N
3 SN74393N
TTL'f.sALE
Z -80
Z -80A CTC
Z -80A CPU
Z - 80 002 16-64K
B085A
2901A
MC6BOO
SN7400N
SN7402N
SN7404N
SN7408N
SN7410N
SN7412N
SN7413N
SN7414N
SN7416N
SN7417N
SN7423N
SN7425N
SN7430N
SN7437N
SN7438N
SN7440N
SN7442N
SN7443N
SN7445N
SN7451H
SN7454N
SN7474N
SN7475N
8 for 4 .00ea
4 for 19.5Oea
8 f or 6.50ea
24 .50ea
Asse mblel Ed ilor
Music Composer
Mail ing list
TV Switch Box
16K RAM
8K RAM
1319.00
Disk Orill 1565.00
Modem 1169.00
__ _
149.00
$4900
111.00
IS .95
1155.00
1119.00
2732
4116 300NS 3.00ea 8 for 17.50
200NS 3.75ea 8 for 19.50
2114L 300NS 3 .5Oea 4 for 13.75
200NS 3.75 ea 4 for 14.25
EPROMS/RAM'S
Doomsday Alarm
7 Watt Au cUo Amp Kit
Super Value Power Transformer
Well made. open frame trans former with mount ing ears. Buil d a
"'5 and t. 12 suppl y with ine xpens ive parts. Free schemati cs 01
severa l design s. Primary 117VAC. SEC ' 115VAC@.5A SEC
#2 15 VAC @ .5A SEC #3 8VAC@ 2.5A. ORDER:
SPECIAL BONUS,Ord.r 2 BET-OOOS
G. t fr 723 voltag. $2.9S Each
regulator Ie !
Pr ot ect yo ur expens i ve equi pme nt f rom overvo l tage
condi t ions. Every comp uter shou ld have one! Work . with any
fused DC power source f rom 10 to 20 volt s up to 25 amps.
9.9 5
KI T
SMALl. SINGLE HYBRID IC AND COMPONENTS FIT ON A 2" x 3' PC
BOARD (INCLUDED) RUNS ON 12VDC. GREAT FOR ANY PROJ ECT THAT
NEED S AN INE XPENSIV E AMP l ESS THAN 3"- THO @ 5 WATTS
COMPATIBLE \ i H SE-01 SOUND KIT
* NO C.O.D.'.
* SEND CHECK M.O. OR CHA RGE CARD NO.
* PHONE ORDERS ACCEPTED ON VI SA AND "" ASTERCH ARGE ONLY.
* ADD 5.,. FOR SHIPPING
* TX. RES. ADD 50;"STATE SALES TA X
ALL FOREI GN ORDERS ADD 30"!10 FOR SHIPPING CHARGES.
U. S. FUNDS OHLY.
(214) 278-3553
Overvol tage Protection Kit $6.95
ATARI 800
COMPUTER SYSTEM

'" 400 Computel SK _1350.00

, SOO Computer 16K-I 160.00
. -' , , % *sOOCOMPUTER
._.- I
Best BUy/
ATARI PERIPHERALS:
1115.
00
ReCDIder 165.00
Interface( 850) 11/5.00
_ ill.!LO _
Star Raiders 149.00
Space InndllS 111.00
Chess In.oo
Kingdol 112.00
Hangman 112.00
BlackjaLk 112.00
1.20
2.95
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2.95
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1.60
1.15
1.50
1.20
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.25
.55
.30
TRS80
16K Add-On
Instructions&
Dip Switches
$25.95
Apple Expansion Kit
16K Memory Add-On
Includes Instructions
$19.50
MISC.
2716 7.25 ea
5V 450 NS
2708
I.............. 450NS 4 . 25ea
2102
450NS
8038
NE555
AY5-1013A
1488
1489
8T26
8T28
8212
8216
1S41OSCR
IT41omlAC
7905
7908
7915
7918
7805
7806
7808
7812
MC1330A1P
MC1350P
MC1358P
LM380
LM565N
LM741
MC1458P
LM720
AY3-8910 PROGRAMMABLE SOUND GENERATOR
The AY3-8910 is a 40 pin LSI chip wit h t hree oscillat ors, t hree
amplitude con trols, programmable noise generat or, three
mixers , an envelope generato r. and t hree DIA converters t hat
are cont rolle d by 8 BIT WORDS. No ext ernal pot s or caps
requi red. This chip hooked to an 8 bit micropr ocessor chip or
Buss (8080, Z80. 6800 etc .) can be software cont roll ed to
produce al most any sound. It will play t hree not e chords, make
bangs. whi stl es. sirens . gu nsh ots, explosi ons. bleets. whin es.
or gru nt s. In additi on, it has provisions to cont rol ItS own
memory c hi ps with tw o 10 ports. The chi p requi res +5V @
75ma and a standar d TTL clock oscillat or. A tr uly incredi ble
ci rcuit .
$12.95 W/Sasic Spec Sheet (4 pages)
60 page manu al w i t h 8 -100 i nt erf ace inst ruct i ons and
sever al pr og r amming ex ampl es, $3.00 ex t ra
MANY OTHER COMPONENTS AND KITS AVAILABLE
IN OUR COMPLETE CATALOG. CALL OR WRITE FOR
FREE CATALOG.
ThOSE Q1 Is a co mplete kit that
cc nt ems all t he pari s 10 bUild a
pr ogr ammable sound effects
f
SN76477 Sou nd ChIp. the
board pr ovides ban kS o f MIN I
DIP swucnes and pols to
progr am the vari ous com-
bina ti on s ofihe SlF OSCillat or ,
veo. NOtse, One Shot, and
Envelope Cont rols A Quad oc
Amp Ie .s used to Imp lement
an AdJusl able Pul se Genera-
tor. l evel Co mparator and
Mufll pl ex oscruatc r for even
more versat il ity , The x 5-
PC Board featur es it prot otype
area 10 all ow for user added
CIrcui try Easily programmed
to du pli cat e Expl o s Ion s ,
Ph..or Gun s, St eam T, ainl , or
al most an mfln l te number 01
olh ..- sound . The unit has a
multipl e 01 ap plic atio ns The
low price Includes all parts.
assembly .manual. programming charts. and detailed 76417 chip
specmcano ns. It runs on a 9V battery (not rnclucecj . On board
l 00MW amp Will drive a small speaker directly. or the unit can be
connected to vour stereo with Incredible results
'
fSoeaker not
76417 Is Included. Available separately for $3.1 5 each.
Sound Effects Kit S18.S0
amps
29.
9
5
:y. price avail .
;)OVIIJ
VPPLY
OD
# C 198
)ut- 110/ 125v
t p t - Svdc
Synertek

_OW COST
rERMINAL WITH
(EYBOARD AND
'IDEO 100 at
.. $550.00
:PSON
IVl X- BO
560.00
>PLE
INTERFACE
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CIRCLE 58 ON FREE INFORMATION CARD

CIRCLE 33 ON FREE INFORMATION CARD
Onl y..
PIll S S tl1/)P Jll g
W DATA
Model #5111119
Only
$479
0 0
C,lch
Motorol a #XM 351. teat unnq adj ust-
able nonzon tat osc . fo r al l display
conf igur at ions. 1171230 VAC opera-
tion. xfr Input for Isolat ion. BNC com-
posite Video Inpu t. co ntrast & br ig ht-
nes s con tr ols. Used. tested. and oper-
at ional. good co ne 16x64 or 80x24
formats Orig inall y cost over $20000!
TOP QUA LIT Y DISPLAY!! DATA INC LUDED .
DAISY WHEEL TERMINAL Tested & Functo onal NOW ONL Y $999
00
{F or mer l y
"'OMPUTERS - C FR I nc i
I.J , - NEW NUMBER -
pERIPHERALS
617/3728637
, 18GRANITE STREET
UNLIMITED!
12" P-31 VI DEO MONITORS OEM- QUA LlTY'!
4K X 16 MEMORY BOARD with 64 IC chips (2102)'
in sockets. Super deal at $50.00 with data.
16K MEMORY 4116-4 $3.00 each or 8 for 20.00
MPI 8 inch SINGLE SIDE DISC DRIVE $ 175.00
MPI 8 inch 2 SIDE DISC DRIVE 350.00
SHUGART 8 inch FLEX DRIVE 850 FDD 425.00
MOTOROLA MONITOR 9 inch 115 volt 60.00
MOTOROLA MONITOR 12 inch 115 volt 85.00
Above 2 units accept composi te vi deo. No cabinets.
Used, OK. 2 units below, havehi volt supply only.
BALL BROS. 12 inch monitor 50.00
BALL BROS. 5 inch monitor (in case) 50.00
MK 4164 Dynamic Ram 65,536 x l 20.00
DATA STATION CONSOLE w/keyboard 9 inch
monitor, power supply. Logic boards broken. $80
Send for details on this one.
e19" Diagonal Sc reen
oby CONRAC: Pr o-Quality
o120VAC, 50 /60 Hz
-R , G, B & Sync Inputs
.Perfect for Gr aphi cs. Etc.
-Lock ed Access Do or
-Ideal Color Mo nitor for All Purposes
-Li ke New. Unused (as- is)
P.l CJl.19 rr19 ana H,lTld1mg 5;>0 Pdy Shlppmg On OC /, 'V(!f ,'1
19" COLOR MONITORS Manuf act ured by CONRAC. st udio
quali ty . full co lor monit ors with built-in de-Gaus s. inde pend ent A.G.B. & Sync i np uts &
much. much more. Or igi nall y over $1K.
lJomputers, Peripherals, Unlimited!
DON'T MISS THIS MONTH'S SPECIALS!!!
*Sel ectric-II I / 0 PRI NTER DC stepper mot ors posit ion t he carrie r
t'Y'\I t \ AREAL and and th e sta ndard " Select r ic" select io n
S\ BARGAINIII and functi on sOleno ids . offer parall el con trol
... capabi li ties. Driver ci rcu itry not Incl uded. Fan-
tastic bidir ecti onal capa bilities for plotti ng ,
proport io nal spaci ng and mor e!! Used. removed
fr om so ptusttcated wo rd processors. whole.
AS-IS. Includes dat a and i nfo No type eleme nt
Included Only...
' Sc ICCI IIC /I ,,",, 1I ,ION'l I,HI. 0 1 $34900
IBM GO I Il c./ ell
P,l c k.lgmg &-H, wclll/lg S2D P,lY ::JlI'VPlfl q On Del ive r y'
__401l-PREFORMED V. WAITERS, popu lar vatu , some 5 & 10%.r. , .(16246)
_ _ 35UPRIGHT ELECTROS. 100%, a ort ed vatu & vall ' g , mar ked . . . ('3226)
_ _ 75CABLE TIES, 4" ncn -stlp whit. pl tlc, Ilk. Tywr.p, . . .. . . . .('5218)
_ _ 50-MINI POTS, pc . tyl., .Ingl. turn, assorted valu. .. . . . .. . .. . . . .. . .. . ('3345)
_ _ 150-PC. CAPACITOR SPECIAL, t. mytare, polys , mic , . l c. l 00% rnat , . ('6264)
__175-V,WATT RESISTORS, ... Id . carbons, carbo-tl lms, some 5%.r. . . .. . (I5797A)
__60- POLYSTYRENE CAPS, aorted typ, . Iy l & . iz , all good , ('2729)
__SURPRISE PAK A ortment of IC'., caps , pol nd parts of .v.ry d c . . . ('6648)
__175HALF WAHERS, 100% color cod ed r tet ors, t. vatu , . . . ('3046)
__175-MOLEX SOCKETS, "on a strlp", make your own pc sockets, ('6255)
__4ooPREFORMED V, WATTERS, a ortad vatu , precut for PC appl . , .. ('6622)
_ _ 24-MINI BULBS, ASST. VOLTAGES & bIyl , some cclored. . ('6757)
__125LONG LEAD DISK, pnm e, mark ed caps , sort ed materlal (12598)
__50-SLIDE SWITCHES, varlou napes, slz.s .nd typ . . . . . . . . . . . . . . . . . . ('2726)
__25-MICRO MINI REEDSWITCHES, l "long, for alarms, r.l ay systems, etc ('6283)
__50THERMISTORS, varlo us lyp & st yl , n.g. eoetfl clent , 100% ,(' 4089)
__200-PRE.FORMED DISCS, cap s wll ds f or PC U, rnlx ed val ues, (12605)
_ _ 50-AXIAL ELECTROS, asst . vatu, vol ts , . Iz, wh.1 a bUyI . . . . . . . . . . .('3227)
__100-PLESSY CAPS, cer arnlc block. In orted slzes & values , . " ('6221)
_ _ 3WATCH GUTS, 5-functl on, LED .tyl., orted . Iz , untes ted (' 6287)
__6-TIME DELAYS, solld state, asst . from 450 msec 10 8 Sec ('6758)
__lOll-PLASTIC TRANSISTORS, untes ted, 10-92, t. Iype ('2604)
__75TRANSISTOR ELECTROLYTICS, .poxy encapsulated, at. valu, ('2747)
_ _ 2OSLlDE VOLUME CONTROLS, v. rlou. values & Iype., for HiFI, etc ('3057)
_ _ 501l-PC. HARDWARE SURPRISE. (apprcx.) 1 1b. t. screws, washer s, etc, ('6271)
__100POWER RESISTORS, 310 7 w.tt power rlater (' 6281)
__50-2 WAIT RESISTORS, a orted carbon film. el c. ome 5%.r. , (' 6238)
_ _ 24:'SKlNNY TRIM POTS. multi & .Ingl. turn , t. values & typ . s, (#6285)
_ _ 40 CRYSTALS orted Iype om. H6IU ome frequency marked " (#6258)
__20-9V BAITERY CLIPS, . nap connecter, ceded, in.ul.led Id (#6286)
__4 HEAVY DUTY LINE CORDS, 2 condo 6ft . 16 g.uge (#6292)
__201l-PRECISION RESISTORS. ;;W ort.d w.tt.ge. 1% xlal (#2428)
__3Q-PANEL SWITCHES ort.d rotary, micro, sllde tc ... . . (#6629)
__20PAIRSRCA PLUGS & JACKS, popul ar for HIFI, speakers, etc (#6630)
__42N3055 NPN TRANSISTORS, 115 watts, 15 amps , TO3, 100% mat (#6633)
_ _ 5LINE CORDS, h.a vyduty.18 g.ug., 6'. molded plug, z-cend (#6499)
__202N3055 HOBBY TRANSISTORS. manu f, tatlcut, TO3. Ut I, (#6624)
_ _ . 25-PLASTIC POWERS. 25 w.tt. npn & pnp. 50200 bvcbo, TO220 (#6237)
__150-"4000" RECTIFIERS.IN4000 r1 m.y Include; 50 10 10OOV (#2417)
__30SCR. &TRIACS sorted val ues, 10 Amp TO220. unt est ed (#6337)
_ _ 6Q-IN914SWITCHING DIODES, 4 nsec, axlal, gl unt ested . . . .. (#6632)
_ _ .30INSTRUMENT KNOBS. for half round ahaftsom. w/polnlers (#6498)
_ _ 35STEREO INDICATORS. tiny red 1.5V bulb for HIFI replac ement . (#6244)
_ _ 40EDGE CONNECTORS. ... t. 4 & 6 pin . 2.ld.d, pc I.ad . . . . . . . . .. . . . . (#6364)
_ _ 6-MINIMOTORS.lype RE56. 1.5-6VDC. color -ceded wire leads . . . (#6718)
__25NE2 BULBS . neon, for 110 VAC. requlrae reslster, (not Inc l.) (#2813)
_ _ 15OMETALLIC RESISTORS. mo.tly ;; w. tt ers. at. v.I . 15% tot.. (#6280)
_ _ .40VOLUME CONTROLS. acrted valu & types . . . . . . . . . (#6331)
_ _ 252N3904 TRANSISTORS, 100% mat erial . (#6370)
_ _ 28ft. COLORED20 MIL FIBERS. 2I.nglh., aorted colors (#6768)
__125 - 0 NE WATT RESISTORS, lop name s, mostly carbcns.some 5%er. (#3300)
_ _ 200 PC. SEMICON SPEC IAL, 1. diad , zeners, elc. untested (#6284)
_ _ 40-STRAIN RELIEFS, asst. types In var ious si zes & shapes - liI6756)
_ _ 1- UHF TUNER , 3- g. ng. 300 ohm, dir ecl driv e Iype #6658)
__200-TUBULAR CAPS 1. fubulars, 1OOmmf 10 0.1 mf 10 600 WVDC (#6254)
_ _ 60-MINI LAMP SOCKETSest . sc rew, bayonet , & . n.p-In (#6789)
__150-SUBMINI IF TRANSFORMERS, 1. I r.n.l.lor r.dio Iy pes (#62591
__10-PUSHBUTTON ALARM SWITCHES, .psl n.c. 1A 125 VAC (#6267
_ _ 25 -DATA ENTRY SWITCHES, a I. 1/2" .qu.r e keyboard . wil ches (#6667)
_ _ 10-MOTORS MOTORS. aI . ize hobby molar., 1-1/210 12 volt (#2551A)
_ _ 150-TERMINA L STRIPS, 1.crew & solder l ug Iype. . . . . . . . . . . . .. . (#6251)
_ _ 50 -TO- 5 TRIACS, assl. 50 10 600 PIV.70% yield. gold pla l ed, 3 le.d. (#6321)
_ _ 200-HI -QUALITY RESISTORS, liB. 1/2, & 1 w.tter .l % & 5% (#6627)
_ _ 40-MYLAR UPRIGHT CAPS, 1. epoxy, pl.sllc, poly.lrene, elc (#6634)
__20 -HOBBY LEOS. aI . I ype Iyle. & co lor mo.tly dim. .. . ... . . . . (#6225)
_ _ 12 FT. -FIBER OPTIC RIBBON, 3/B" wide ribbon. co nduclllghl '(#6770)
- - 10 0 -PIN SOCKETS, in li ne male & female crimp-on con nec tors _1#6902)
__1aO-ASSORTED SPACERS, nylon spacers, washers, gr ommet s, etc . . #6617)
"JOIN THE PAK"
DON'T MISS OUR 25th
ANNIVERSARY CATALOG
Total Amount of Order $ _
INCLUDE SHIPPING AND HANDLING: U.S ADD $3.; FOREIGN, ADD $7.
MASS. RES. ADD 5% SALES TAX.
TOUCH PAD solid state w/LSI chip. Be"l system
compat i ble. For computers & phones $15.00
12 VOLT GEL-CELLS 2.5 AH $14.00 5 AH S17.00
12 INCH CRT bonded face plate. New with specs.
Made fo r computers. $25 each 5 for $100
IR SCOPE, SEE IN DARK portable $ 265.00
WALKY TALKIES Govt surplus used\.
condition. 47-55.4 mc range. With
schematics. Govt AN/PRC-6
S25 each 2 f or S45. An t. $5 each
ASCII KEYBOARD parallel S50
RED LED' s . 10 for $1.00
MIN ORDER S10.00 CATALOG No. 20 now read y
Shipping extra on all merchandise
MeshnaInc., PO Box62, E. Lynn, Mass. 01904
P.O. BOX 942, RE8
S, LYNNFIELD. MA . 01940 POIYPIH/:
NAME _
ADDRESS
CITY _
STATE ZIP _
Enclosed is 0 CHECK, 0 MONEY ORDER
Charge my 0 MASTERCARD
ACCT. # _
Orders only
(f)
o
Z
o
a::
.....
o
UJ
-l
UJ
6
o

a::
106
CIRCLE 27 ON FREE INFORMATION CARD CIRCLE 3 ON FREE INFORMATION CARD '
The APPLE copy program
COpy II PLUS
$39
9 5
._._._._...-._..._._._._._._._._._._._._._._._._._._.-._._._._._._._._._.-._._._._.-
I

I
i

I
VERSATILE - Copy II Plus copies multiple
formats - DOS 3.2, 3.3, PASCAL,
FORTRAN and most "protected" diskettes!
FAST - Copy II Plus copies nearly any
diskette in less than one minute . That's faster
than most standard copy programs. Written
entirely in ultra fast assembly language.
Search no more for that universal copy
program. Copy II Plus is the most advanced
copy program available for the Apple II
Computer. Compare capability, compare speed,
compare price, then call or write to order Copy
II Plus. Requires Apple II with 48K and at least
one Disk Drive.
r?
Software, Inc.
P.O. Box 3563
Central Point, OR 97502
(503) 773-1970

or check
Deliveries from stock. No C.O.D.'s
Apple is a registered trademark of Apple Computer, Inc.
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._.._._._._._._._._.-.-.-
CIRCLE 71 ON FREE INFORMATION CARD
Please make checks and money orders payable to MicroAce or phone your order quoting Master Charge, Visa,
Diners Club or American Express number for immediat e despatch. Add 6% Tax for Shipments inside California.
MicroAce, 1348 East Edinger, Santa Ana, California, Zip Code 92705. Telephone: (714) 5472526
.....
CD
ex>
.....

C
o
C
(/)
-l
A new
generation of
miniature
computers
ONLY $29
4K
ONLY
$110
A COMPLETE
COMPUTER
MICROACE/SINCLAIR
VIDEO UPGRADE KIT
MICROACE/SINCLAIR
16K RAM PLUS
EXPANSION BOARD
SLOTS WITH EXTRA POWER SUPPLY
16K
ONLY
$149
8K FLOATING POINT
SUPER ROM PACK
WITH NEW MANUAL ONLY $35
Only runs wi t h NEW ROM
(Smooth screen display)
OOK
' MICROACE/
L . SINCLAIR USERS
24 PIN $0.25
40 PIN $0.30
UHF Modu lators .9.90
COMP PRO MIXER
Professional
-
audio mixer
, that you can
build yourself
and save
l over $200.
-I I \ Only $199 f or
- I I complete kit.
- . I power supplv
r j 'lll 1 I -.1' \1 $50.00
h, I !l l; \.
ACCESSIT AUDIO ADD-ONS
Price on application
Int erface Cards for Appl e,
Pet . TRS80. and PMC -
RS232 Interface Cards not
necessary for parallel.
Full TRS80
TTL SALE
74LSOO $0.15 74LS74 $0.45 74LS365 $0.75
75LS04 $0.15 74LS86 $0.55 74LS373 $2.20
74LS05 $0.20 74LS93 $0.90 ZaoA $5.50
74LS10 $0. 29 74LS157 $1.20 zao $4.20
74LS32 $0.35 74LS165 $1.75 REG. 7805 $0.90
SOCKETS LOW PROFILE
14 PIN $0. 10 18 PIN $0.15
16 PIN $0.10 20 PIN $0.15
10V Power Adapter 6OOml. $6.90
GET YOURSELF A NEW EPSON
MX80 & MX70 PRINTER AND
SAVE A
COMPUTER
SHARP
PC1211
$190
Has got to be one of the world' s ,@iA ....
greatest TV games. You. really get ..
hooked. Has also 4 other pinball
games and lots of optio ns .
Good ki t for up-g rading old
amusement ga mes.
PMC PERSONAL COMPUTER
TV GAME BREAK OUT KIT
lMicroficiJ J:Jt.
WITH
NEW
EXTRA
KEYS!
'6K user RAM
plus extended 12K Microsoft
BASI C in ROM. Fully TRS-80 Level II
software compa tible _ Huge
range.of software already avai lable _ Self contained, PSU,
UHF modu lator, and cassette . Simpl y plugs into video
mon itor or UHF TV Full expansion to disks and printer
- Absolutely complete - iust fit into mains plug .
MINI KIT PCB, so und & vision mod ulator, memory ctuo
and ce code chip . Very simple to construct . $30.00
OR PCB $6.00 MAIN l SI .17 .00
CIRCLE 64 ON FREE INFORMATION CARD
107
LOWEST PRICES FOR PRIME ICs!
ORDER, DESK: 800 3250101
In addition t o the broadest line of digital int egrated circ ui ts ottered anywher e,
I. C.C. offers the complete line of products from the tottowinc well known
manutacturers of electronic components and subsvstcnn.
. PHONE: (314) 474-94 85
Vecto r is The name in breadboard ing, and
I.C.C. has t he widest range of Vectorbords.
Exper imenter's Boards, Vector Pins, Terml -
nels and Wrap Posts, Wrapping Too ls, and
blan k Micropr ocesso r Boards for virtually
every brand of Mic rocompute rs.
DI SCO/J/VT r OIM ,. ""t _
Nll S 001..$ 4 99 JIIoI S1 00
tfSHS S 5'10S 14" 4<Al S I OO
S15OO$4'1 9'1 ..." H I1J5
LESSI n Idd $Q50
tE SS X1'l SIOOOQIt>d /J, . NO Cll Affc;C
Ll SS 75 " Th<> fl>,pit'J , ...../u<"" 01
110 _",,,, 1.1 S
65205
I.C.C. has in st ock th e complete line of AP Produ ct s, incl ud ing
t he Poweraccs. ACE Circuit Evaluators, Super-St rips, DIP
Jumpers, PC Board Connectors, and even th e NEW Hobb y Blox. If
AP ma kes it, we have it in st ock for immedi ate delivery. And, best
of all, ou r Volume Discount is applicable to all of them.
AfHcllM>d<wToIM
S 0 01 - $ 9)9
S 10 00 S 7499
S 75 00$ "99
S IOOOO'S4 9'J 9?
S SOOOO-S m 99
$IOOOOO..-dVp
P. O. BOX 1837
COLUMBIA, MO
wrapping
. wire
O. K. Machine & Tool has one of th e widest line of
pr odu cts fo r wi re wrapping. and the associat ed
accessories. These high quality, yet low cost, compo-
ne nts include: manu al and battery-operat ed wrapping
too ls, wire dispe nsers, units, circuit
boards, etc . Th e entire line is available from I.C.C.
The ent ire range of 5% and 10%, % and '11 watt, type RCR
Mif-Grede resistors manuf actur ed by Allen.Bradley and
Stsckpole is available from I.C.C. The estab lished reliability
levels of 0.0 1% (Orange fifth band) - 0.00 1% (Yellow fifth
band ) failures per tho usand hours of ope ratio n at 50% rated
wattag e is your assura nce of tr ou ble-free ci rcuit performance.
Pre Cut and Pre-Strip ped (1" from each end)
No. AWG 30 wrapping wire in ten co lors (Blk,
Brn, Red, Orq. Yel, Gm. Blue, Via, Gry, and
and in fiftee n different lengt hs from 1"
to 15" in fou r packag es (50 , 100, 500. and
1000 ) are available fo r low cost. yet fast and
reliable ci rcu it and back -pane l wriTing.
7<4 115 . SO49 74 lS11. $0.36 7<4lS196 . $1.25 7<4S 189, . $3 35 74C90 7. . $0 75 4089 . .. $1.75 lIv'l7<4 1CH . SO55
74 116 . . . 0 <49 74lS13 . . 055 7<4 lS 197 . . 1,25 74S194 ... . 2. 15 74C908. . . 1.19 400 3 . . . . 0 99 lM 748CN . 0 35
74132 . .. D,7!> 74 lS14 . . 1.10 7<4 lSn1 .. 1.90 745200.. . 3 95 74C900 , . .. 1. 15 <4099 . . 2.10 lM 1458N . 0 .58
7400 . $0.10 7414 1 . . 0 79 74lS15 . . 0.3<4 74lS2<40. . . 1.15 7<4S206. . . <4 55 74C9 10. 6 ,00 4503 . 098 lM 1496N .. 069
7401 . 0:20 741<45 . . 0.79 74lS10. . . 034 74lS241 .. 2.25 74S153 .. .. 1. 15 7<4C0 14 .. . 1.<45 4507 .. . 099 l Ml 880N 1.15
7401 . .. 0.20 Hl<47 .. . 1.70 74 l S21, . 0,3G 7<4 lS2<4<4 . . 2.25 7<4S257 . .. 1 <4 5 74C918 , . . 149 4506 . . . H iO l M1 111N . 1.55
7403 . . . 0207<4 148 .. . 1 :!9 Hlsn, . . 036 74lS15 3 .. 1.0 1 74S158 . " . 145 74C925 ... 7.80 45 10 , . , . . 1,15 MC1357 P ., 1 55
7404 . , . , 0 25 H l50 ., . 1 10 7<4lS2G, ,, 0 36 7<4 lS257. 086 745280 . , , 2.75 HC916 , 7 80 4511 . . 1.15 MC1455Pl, . 0 35
7405 , . .. . 0.10 74151 . , . 0 59 74lS27. 0.36 , , 0 ,86 745287 . . 390 74C917 . .. 780 4!i12 . . . , , 1 25 .. 0.05
7400 . , , . o :ro 74151 , . 059 74 lSJO. ., 0. 34 74lS200 .. 038 745289 , . 4.35 HC928. . . 1 89 4516 . , .. , 1.n MC1456CV . 0 95
7407 . .. 0.. 19 74153 . 0 59 74lS31. " . 0 40 74lS:MiG, . 0.49 74S387. , . 5 .70 " , 4518 . . . . 1.15 MC1458P l .
7<408 .. . , 0 20 74 154 . , . 1. 15 74 lS37. . . . 036 74lS179 . 0 73 93S00 " 200 ' 4519 . . . 0 62 MC1<496l , . 0 69
7409 , . . 0.20 74155 . . . 0(;9 7<4I. SJa , .. 0.36 7'(lS183 , . . 0.99 9350 5 . .. 1,30 4520 . . . . . 1.1 5 MC1709CP1 .028
74 10 , ' , 0 .20 74156 , , ' . 0 69 74lS40.... 03<4 7<4 lS290 , . 1.05 93S 10 . ... 3.<45 <4000 . , . $035 4527 . . . , 1 6 7 MC1710CP.. 0 29
7411 . .. . 0 2 5 74157 . . 064 74lS42. , , . 0 8 2 74lS29 5 . . 0.99 93S12 . , . 1.35 400 1 .. .. 0.35 4518 . , , . 1.50 MC1711CP.. 0 39
7412 . . . 0.15 7<4 158 . . 74 lS47. . 1.05 7<4 lS365 , . 0 ,66 9 3513 . 1.9 5 <4001 . .. 0.35 4539 . .... 1.35 MC1741CG . 0 ,35
74 13 . . 039 7<4 160 . 087 74lS48. . 1.05 7<4 lS3GG . 0 66 9 3516 . . . . 3<40 4006 . . . . . 1.19 <4555 . . . 089 MC1748CP1 .035
7<4 14 .... 0.70 7<4 161 . . 087 . 1,05 NlS367 ... 066 93S4 1 . 500 400 7 . .. . 035 4556 ... 1.00 MC<4 741CP. . 115
7416 . . . 0.2574162 .. . 087 74 l S51. . . 0,3<4 7<4 lS368 . . 0.6G 935<42 . . 1,50 4008 . . 1.05 . . . 1.09 MC7805C T . 1 20
7<4 17 . . . 0 ,15 74163 .. 08 7 74lS54 . 0 ,3<4 74lS373 . . 2,25 9 3S43 . . . 595 <4009 . 4702 .. . 7.10 MC7800cT . 1.20
7420 . ... 0 :20 74164 . . . 081 74 lS55 . 034 74lS374 . . 1.15 93546 . 1.55 <4010 . 0<49 <4703 .. .. . 8.1 5 MC7808CT , 1.20
7413 . . 0.25 74165 . 087 74 lS73 . . 045 74l S38G. . . 05393561 . 2 65 40 11 . . . . 0.35 <4704 . . 7.30 MC7812CT . 1.20
7<425. . 0. 19 74166 1 22 74lS74. . . . 0.45 74lS390 . . 1 89 4012 . . Oj5 <4 705 .. 9 25 MC78 15CT . 1.70
7<416. . . . 0.29 74167 . 19 5 74 l S76 . . 052 74lS490 . . . 1 89 40 13 . . . . 048 4706 . . . 9 .75 MC782<4CT . 1.20
7427 . . . 025 7<4170 . 1 !>8 74 lS18. . . 048 7<4 lS670 . . 2A5 4014 . . 1.05 <4720 . . . 695 MC78Ml1CT 0 77
7430 . : . . 0.20 H173 1 74 74 l S8 3 , . . 1 05 " 74COO . . $03<4 <4015 ... . 105 4113 . ... 1.50 MC7545 1P. . OSO
7<432 . .. 0.25 7417 4 08974lS85.... 1.15 NC02 . ,. 0 34 4016 . . . . 0 53412<4 . 1.50 MC75492P .. 052
7437 . . . 025 74175 . . 080 74 l S86 , . . 049 74C04 . . 0.354017 . . . . 1.07 4125 . HIS MlM311Pl . 0 85
7<438 . 0 407<4 176 . 078 74 lS'JO . . 0.71 74500 .. 50.45 NCOO . . . 0354018 .. . 1 0 7 400 14 . . . 1,10 "lLM324P .. 0.7!1
7439 . . . 019 1<4 177 078 74lS92. 0.7174501 . . 0.4574<:10 . . . 0 .3<4 40 19 . . 049 <40085 . . 1.69 MlM56 5CP . l .20
7440 . . .. 010 H 178 . . 1 90 74 l S93 , . 0.71 7<4502 . . . 0 .<4 5 74CU . . . 0 90 4020 . . . . 1.13 . 009 8 . , OG9 N5558V . .
] 441 . . . . 088 H 179 1 00 74lS95, . 0.99 7<4503 . . . 0.45 74C20 . . 0 ,]4 402 1 . 1.13 40106 .. 0 ,90 N5596A . . 069
7<4<42 . 0.1)9 7<4 180 079 74 lS101 . . . 0.44 74S04 . .. 0.46 7<4C30 .. 0.34 4022 . . 1 05 40 160 .. 1. 17 NS733A . . 0 ,66
7<441 . , .. . 0.75 74181 1 95 74 l 5109 . 0.4<4 74505 . . . 04G 74<:31 . . . 0.34 4023 . 0 ,3540161 . . 1,17 NE50 1A . . . 600
7<444 . .. . 0 .75 . . 078 74 lS111 . 049 7<4508 . 048 74C42 . 1,00 4024 . . 40162 .. . 1. 17 NE516A . . s co
74<45. 0, 7574184 . . . . 1 95 74 lS113 . . 0<49 14S09 . . 048 7<4C48 . . 1,2 7 4025 .. . 035 40 163 , . 1. 17 NE53 1V . . 390
7446 . . 0 69 74185 195 74 lS11<4 0 .<49 HS10 .. .. 045 74C7 3 . . 0.7 1 402 7 . 0.69 40 17<4 . . . 1.15 NE550A . .. 1.00
744 7 065 74 188 . 385 7<4 lS12J , 0 98 7<45 11 .. . 048 NC7<4 .. . 0.7 1 4018 . . . 0 88 40 175 . . . . 1.15 NE555v . . 03!i
7448 . . 0.79 H l90 .. 099 74 l S125 061 74S15 . , . 0 -,19 74<:76 . 0,71 <4029 . 1.13 <40192 . '" 1.31 . . 090
7<4SO . . . 0 20 7419 1 .. 099 74l S126 06274510 ... . 0.4 5 74C8 3 14 5 40 30 . . 0.45 4019 3 .... 1.3 7 NE5GOIJ . 2 ,50
7451 . 0 .20 7<4 19 2 . . . OBO 74lS1 32 0917<4521 . . . 048 74C85 1.45 4031 . .. 32540194 . . . 1. 17 NES65A . . . 110
7<453 . . 0, 10 74193 . . . oao 74lS1 36 .. 048 7<4511 . . 0 46 74C86 . . . OA9 4034 . . . :2.75 40195 . , 1.1 7 NE5(i06V .. 1.50
7454 . . . 0.20 7<419<4 0 81 74 lS138 . , 0 93 74S30 04S 7<4C89 . . 3.95 <4035 . . 0 99 _ NE567V 0 98
7459 . . 0. 20 74195 . . . 081 74 lS139 . . 0.81 74531 . 0.70 H C90 . .. 1.10 <4040 . . 1.20 SE540l Goo
7460 . .. 020 74196 . 087 74lS15 ' . 0 ,75 74S40 .. . 0 <45 74C9 3 ... 1.10 4041 . . 1 05 SN7545 1P . . 050
7470 0.29 74197 . .. 087 74lS152 .. 075 74$50 ... 0 .<45 7<4 C% 1.30 4042 . . . 0.99 7545 16 TC . SO,SO SN75492N.. 052
147 2 0 ,29 7<4 198 . . 1 45 74lS153 .. 084 74551 . ... 0.45 74Cl 07 069 <4043 . . . 0.89 75492 PC.. . 0 .52 Ul N11 11A . 1 55
1<4 73 . . . 0 ,35 7<4 199 . .. 1 45 74 lS154 . 1.40 74560 . 0 ,45 7<4C151. . 1.35 404 4 , . 089 OS75492N .. 0 52 uA31 1TC . . 085
7<4 7<4 . . . 0 .35 74251 . . . . 1 09 74 lS155 089 74S64 .048 7<4C154 , . . . 3.00 404 6 . . . . 1.79 l J.l311 N . . 0.85 uA324PC. . . 0 .15
7<475 0.49 74283 . . . 210 74 lSH: 6 089 74S65 . 0 48 74C157 . . 1.05 404 7 . . 1.99 lM311V . . 0 8 5 uA55 5TC .. 0 .35
7476 0.35 74290 ... 099 7<4 lS157 .. 0.75 14574 . . . . 0.78 74Cl 6Q, 1. 17 4048 . . . 0 9 5 lM324N .. 0.75 uA556PC, . . 0 ,90
7480 0 .40 7<4293 . . . 099 74lS158 . . . 0 ,75 74576 . . . 0.78 7<4 C161. 1. 17 404 9 . . . 0.49 l "' 340T5 . . 1.20 uA709CV .. 0.28
7481 . . . . 0, 63 7<4298 ... 0 92 . , 1.05 74S78 . . . . 0 ,78 7<4C161. .. 1.17 405 0 . . . . . 0.55 l M340T6 . 1.::0 uA709TC .. 0 .28
1483 . . . . 0 69 74365 . . 067 74lS161. .. 1.05 7<4586 . 0 .78 74C163. . 1.1 7 405 1 . .. . 1.19 l M340T8 . . 1.20 uA7 1OCA .. 0,19
7485 . . . . . 0 ,8974366 . . 0 67 74 lS162 , . 1 05 7<45111 . . . 0. 78 74C16<4. . . . 1.17 4051 ... . 1.19 l M340T12 .1 .20 uA710PC. . . 029
7<486 . 0.4074361 067 74 lS163 . . 1,OS 74S113 . . 0 ,78 7<4C165 . . 1.1 7 <4053 1,19 l M340T 15. 1.20 uA71\CA , .0.39
7489 . . . 1.7574368 067 74 lS164 . . 1.15 74S114 0.78 74C173 .. 1.19 <4060 , 1.'19 l M340T24 . 1.10 uA7 11PC. . 0J9
7490 . . . 0<43 filii 74 lS168 . 1.45 74S131 o ee 74C17<4 1.15 4066 0,78 l M342P12 . 0 77 uA733PC .. 066
7491 .. . . . 0.59 74lS169 , . 1<45 745 133 . . . 0 .<48 HC1 75 1.15 4068 . , 0 .39 l M348N . . 1.25 uA7<41 CT . . 0 .35
7492 . . . . 0 43 7<4lS170 . . 1 80 745 134 . . . 0.48 74C191 1.37 4069 . . . 0.3S l M38ON . .. 0 ,95 uA741HC . , 0.35
749 3 . . 0 43 74lSOO. . $0 34 74 l S173 . . 1 33 7<4 S135 . . . 0 .59 7<4C193 1,3 7 40 10 . . 0 49 l M382N . . 1 60 uA748CV . 0.35
7<49<4 . . . 0 65 74lS01. .. . 034 74lS174 1 10 74S138 . 0 9 7 74C19!:> . . 1. 17 407 1 . . 0,35 l M555CN . 0.35 uA748TC . 035
7<4!)5 . . 0 65 74lS02. . . 0 34 74 lS175 0.89 74S139 . 1,90 74C2OO. . . 7.50 4073 . . 0 35 lM556CN . . 090 uA1458CTC . 0.58
7<496 065 H lS03. . 034 74 lS18l 2.50 745 140 0.5 7 74C111 . 1,89 4075 . . . 0 35 lM56SCN . 1.20 uA21 36PC. . 155
7<497 2.90 74 lS04 . . . 0.38 74lS190 1.25 7<45151. 1.5!:> 74C901 . 0.48 40 76 . 1,29 l M5lj(jCN . . 1,.!>O u A7805 LlC, . 1.20
7<41 07 .. , . 0 ,34 H LS05 . . . 0 38 74 l S191 . . 1.25 7<45 153 2.60 74C902, . 0.48 40 77 . . OG9 LM567CN . . 0 .98 uA7806 UC. 1.10
74109 . . . OA5 7<4 lS08. . . . 0 36 H lS192 .. . 1.15 74S157. . . 0 ,95 74C903 . . 0.79 4078 . 0.45 l M709CN-8 . 0.18 uA7808UC. 1.20
7<4111 .. . 03<4 74lS09. . . 03G 74LS 193 . 1.15 74S158 . . 1.5 5 74C90<4 . . . 0.79 <4081 . 0 35 l M710CN . . 0.:l9 uA7812 UC, .120
741 21 . .. 0.39 74lS10. . . 0 34 74 lS1!)4. . 1.35 74517 4 . . 1 90 74C905 .. 6. 00 4085 . . . 0.79 l M711 CN . 0 39 uA781 5UC.. 1.20
7<41 23 .... 0.58 74lS11, . 0.36 74 lS195 . . 1.35 745 175 . . . 1.75 74C900 . . . . 0.75 <4 086 . . . 0.79 l J.1733CN . 0.66 uA7814 UC.. 1.10
CIRCLE 67 ON FREE INFORMATION CARD
YOU CAN BUY AT THESE PRICES TOO!
AND TIl ESE ARE NOT "FALL-OUTS", "REJECTS", "FUNCTJONALONLYS"', 'COSEMETIC NENTS A YEAR. YOUR SA VltVCS WILL COVER TllE .t ,vJ\ UA L .11E.1111ERSIIJP FEE OF $:!.'i.no.
DEFFECTS"', "DOUBLE.MARKS"', ETC.; BUT, ALL ARE PRIME IC" WI TIl FULL MAN UFAC- AND FRO.ll THERE (W IT WILD RE NET PUOFl'f S. SO OONT Iln Ar. AMI JOIN IX. IN
TURER'S MARKING, AND 100% TESTED PER SPECIFICATIONS. THERE IS ALSO, NO TIME ORDER TO GI VE l"OU SUCH WW PRICES, WE 1I,I VE A n.uv Ll.UfTED ,1D VEf{ T/ Sl l\"(;
LI.lII TS, MINIMUM (lUDEU AMOUN T, OR OTHER CONDITIONS. AS A MEMBER OF
BUDGET, AND YOU WILL !"OT SEE TIHS "AD"' EVEUY ;\[O;VTll. FOR INf'OlI.\fATI ON ON
ELECTRONIC BUYERS CLUB, YOU CAN BUY YOUR IC, OR OTHER CO.\lpO.vENTS SUCH
l IOW TO JOIN AND TO FIND OUT HOW'TIlE CUIR OpEU,I TES, CIHCU' 'll EAlJEU SElU' ICE
AS CAPAatoRS, RESISTORS, DIODES, SOCKETS, BREADBOARDI NG
INQUIRY NU,\ iBER' OF TIll S AD OR SEND A POST C.-1 RO WITIl YOUR NA,l l E At\'J)
COMPONENTS AND EVEN .IlICRO CO.IfPUTERS AT PRICES THAT ,t RE WELL BEU)W AN }' A DDRESS TO: E-DC, P. O. Box 617, Columbia, MO, 65205.
TIlI NG YOU ' HA VE EVER SEEN BEFORE. 'IF YOU BUY ONLY $5 0 /VORTIl OF COMPO
PLEASE NOTE: ONLY MEMBERS OF ELECTRONIC BUYERS CLUB ARE EUGIBLE TO ORDER AT PRICES USTED BELOW,
745 1 $0. 15 74153 10.38 7-1-283 1 1. 20 74L55' $0. 15 74L5 168 $0, 57 74L5670 $ 1.14- 745151 $0.66 7JC48 $0. 96 7,C903 $0.3 ' '0 16 $0.28 lOB $0.51 1528 $0. 71
74xx 7453 0. 15 7415--' 0.53 7129 0 0.51- 74L555 0.15 74LS 169 0.57 745 153 0.66 74C73 0.-1-6 UC90t 0.31- #017 O.H 4060 0.59 1539 0.7'
US" 0. 15 7-' 155 0.38 U293 0.54 74L 573 0.21 74LS 170 0.81- 745157 0.66 7'1e74 0..16 7I-C905 5. 10 40 18 0.51 4066 0.::7 4555 0048
7<00 $0. 15 7459 0. 15 74156 0.3B 71- 298 0.50 74LS 74 0.2 1 7lLS173 0.60 74Sxx 745 158 0.66 74C76 0.4-1- 7-IC906 0.3< 40 19 0.27 ,' 068 0.21 '556 0.59
740 1 0. 15 7460 0. 15 74157 0.38 H365 0.36 74LS 75 0.30 74LS1 74 0..17 745174 1. 01- UC83 0.8 9 7IC907 0.31 ' 020 0.63 HJ69 0. 17 1- 582 0.59
7402 0.1 5 7470 0. 2 1 74158 0.38 74366 0.36 ULS76 0.23 H LS175 D.47 u500 10.23 745 175 0. 95 7-IC85 0.89 'UC908 0.76 402 1 0.56 1-070 0.23 458' 0. 13
7403 0.15 U 72 0. 21 74160 0.48 7436 7 0.36 74LS78 0.2 1- 74LS181 1. 36 74501 0.23 745189 1.83 7-I- C86 0.23 7-I-C909 U8 '022 0.56 #071 0. 17 "7 02 3.87
U ()-I 0.17 U73 0.2 1 7,1161 0.48 7-#368 0.36 74LS83 0.4-7 74LS 190 0.58 74$0 2 0.23 745 191- 1.17 UC89 2.42 74C9 1O 3.2 7 1- 023 0. 17 1-O7:! 0. 17 1703 1.50
7405 0.17 7474 0.21 701 162 0.48 74LS85 0. 54 74LS 191 0.56 74503 0.23 745206 2.48 7"C9 0 0. 71 7JC9 H 0.78 . 02 t o. s: 1-073 0. 17 17M .198
7406 0.2 1 7-175 0. 30 74-163 0.48 7-1-LS86 0.2' 7-1-LS192 0.56 74501 0.2-4 7452 10 1.29 74C93 0.7 1 7IC9 18 0.89 4025 0.17 trJ75 0. 17 >1705 5. 01-
7107 0.2 1 7476 0.21 7416. 0.5 1 74LSxx 71- LS 90 0.33 74LS 193 0.56 7-1-505 o.N 1-45253 0.63 7,I-C95 0.B1 1-'(.'925 3.90 -t 026 0.99 1076 0.53 no 5. 32
71- 08 0.17 748 0 0.22 74165 0.51 74LS92 0.33 ULSI9' 0. 71 u508 0.21 7-1-5257 0. 78 74CI0 7 O.H UC926 3.90 1027 0.36 1077 0.38 1-720 3. 78
7-1- 09 0. 17 748 2 0.3-1 74166 0. 5--' H I.500 $0. 15 7, LS9 3 0.33 74L5195 O. U 745 09 0.2 ' 745258 0.78 UClSl 1.37 TlC927 3.90 W28 0.50 UJ78 n. 2' 1723 0.78
U I 0 0.15 7183 0..16 7-1167 1.06 74L501 0.15 74LS95 0.54 7ILS I96 0. 56 745 10 0.23 U5280 1. 14 7-I-CIS' 2.01 UC928 3.90 ' 029 0.58 . DBI 0.17 1i21- 0.78
7411 0. 17 7485 0.50 7H70 a M 74Lf)02 0. 15 741.5107 0.22 74L5 197 0.56 74511 0.23 7-18287 1.92 UC15 7 1. 37 4030 0.23 .DB5 0.-1-2 1725 2. 15
7412 0. 17 7,'86 0. 20 74 173 0.58 711. 50 3 0. 15 74LSI 09 0.2 2 74L5221 0,58 745 15 0.23 U5289 3. 11 74C160 0.71 -l031 1.12 101J6 0.12 I OOll- 0.-1-6
74 13 0.2-1 748 9 0.95 7417 4 0.46 74LSOl- 0. 17 74LS I1 2 (l. U 741.52' 0 1.2 3 U520 0.23 7-15387 2. 98 74C161 0. 71 1xxx '0 3 1 1.30 IOR9 1.07 IOOUS 0.89
7414 0.41 7-1- 90 0.3 0 74175 0,45 74LS 05 0.17 74LS11 3 0. 2-1 ULS21-1 1. 23 7452 1 0.2 ' 93500 I, DB 74CI62 0. 71 , o35 0.71 1093 0.36 40098 0. 38
U 16 0.20 H91 0..17 74176 0,47 7$.t508 0. 16 U L51H 0.21- 74LS2,4 1.23 71522 0.23 93505 1.2 5 71C163 0. 71 '000 10. :W 101-0 0.63 1099 0.80 10106 0.#6
7417 0.20 7492 0.30 71-177 0.47 74LS09 0. 16 74L 5122 0.41 74LS 251 0.51 7453 0 0.23 93510 1.88 74CI6 ' 0.7 1 400 1 0.17 I-Oll ' 0.51- .5 02 0.23 1016f) 0.7 1
7420 0. 15 ].193 0.30 74178 1. 01- U LS IO 0. 15 ULS123 0.47 7-ILS253 0. 5 ' 7-.532 0.38 93512 0. 7-1 71-C165 0.77 '002 0. 17 lOt 2 0.51 1503 0. .16 1- 016 1 0. 71
742 1 0.1 7 749 J 0.38 U 179 1.0-' 71-LSl 1 0.17 74LS 125 0.33 741.5257 0.4 1 7-IS,O 0.2-1 93516 1.85 UC173 0.65 4 006 0.7 1 I-OU 0.51- ' 507 0.1-2 1- 0162 0.71
7423 0.18 7495 0.38 7-1180 0.48 ULS12 0.17 74LS 126 0.33 ULS258 0.41 7455 0 0.21 935-1-1 2. 73 7-ICI7 ,' 0.65 1- 007 0.20 I-OU 0.51 1508 1.6 1 1- 0163 0. 71
7425 a lB 7496 0.38 74 181 1.02 74LS1 3 0.30 74.1.5132 0.47 74L5259 0.11 14$ 51 0.2l 935'2 0.82 71C175 0.65 ,1- 008 0.65 10'5 0.89 1-510 0.59 1-0171 0.6 5
U26 0.18 U 97 1. 58 7,1]82 0.53 74LS H 0.60 ULS133 0. 26 74LS260 0.21 74560 0.2 ' 9351-3 3.2-1 7.C192 0,72 1009 0.27 1-01-6 0.63 4-511 0.65 1-0175 0.65
7427 0.18 74107 0. 20 7418' 1.06 7-4L5 15 0.15 74LS136 0.26 74LS266 0.2 7 71-564 0.24 93516 0.8 ' 7,CI93 0. 72 'O IQ 0.27 10'7 O. M 1512 0.68 #0192 0. 72
(J)
7430 0. 15 74 109 0.22 74 185 1. 06 74L 520 0. 15 74LS 138 0.45 74LS2 79 0.29 7-1Sd5 0.24 9356 2 I. /'-' 74Cl95 0. 71 'OIl 0.17 ' 01-8 0.28 '516 0.59 10193 0. 72
o
7432 0.1 8 71-120 0.60 7-1188 2. 10 U L52 1 0.15 7-$.1.5139 0..15 ULS283 0,47 7#SU 0.36 74C200 4.08 1012 0. 17 1-01-9 0.28 4.s1R 0.59 1019' 0.7 1
743 7 0.18 741 21 0.26 74190 0.50 ULS22 0. 15 U 1.S151 0.41 741.5290 0.58 74576 0.36 71-e22 1 0.96 1- 013 0..10 4U50 0.28 ' 519 0.30 1-0195 0.7 1
Z 70138 e.ra Ul22 0. 27 74191 0.50 741..526 0. 18 7-1LS152 OAI 7, LS2 95 0.51 7-1S78 0.36 i .te x.x 74C90 1 0.3J 1-01,1- 0.5' 105 1 0.51- 1520 0.59
0
743 9 0. 18 H 123 0.38 74 192 0.50 741.527 0.16 74LS 153 0.41 741.5298 0.54 74S86 0.36 74C902 0.34 4015 0.51- -1-052 0.51- 1-527 0. 71
a:
74J O 0. 15 7-1125 0. 30 74193 0.50 74LS3 0 0.13 7-IL5 154 0.7 2 74LS365 0.33 74S 112 0.36 ucoo $0.20
f-
74 1-1 0.60 7$.126 0. 30 741 9,1- 0.48 74L532 0.17 H 1..s155 0..11 ULS366 0.33 745113 0.36 UC02 0.20

@[!, lJ!JOO9 o
7412 0.35 74 132 0.39 7$.195 0.1-1- 74LSJ7 0.18 74 LS156 0.41 74LS367 0.33 745 114 0.36 74COI- 0.20
W
74'-13 0.50 U 141 0. 53 74196 0.41 74L')J8 0. 18 741.5157 0.41 74LS368 0.33 14S 132 0.52 74C08 0.20
...J UH 0.50 74145 0.4 5 74197 0..17 74LS4 0 0. 15 ULS158 0.41 74LS3 73 0.96 745 133 0.23 UCI 0 0.20
A SUBSIDIARY OF ECI.USA, INC.
W 7145 o. So ].$.147 0. 89 7$.198 0.63 74L S' 2 0.42 ULS160 0.5 1 7' LS371 0. 96 7-1513 1- 0.2 1- 7-,C14 (U6
I
7-1--16 0.46 U 148 0.62 71-199 0.6 3 74LSf.i 0.60 74LS 16 1 0.5 1 74L $386 0.28 7-15135 0..12 74C20 0.20 P. O. Box 617
0 J.U7 0.46 741 50 0,54 7422 1 0.50 U$1-8 0.5 1 74LS 162 0.51 74LS3 90 0.93 745138 0.4 9 7I-C30 0.20
Columb ia, MO 6520 5
s 7148 0.46 14 151 0.38 7-1251 0.57 7,LS.9 0.54 74L5 16.1 0.51 74LS 393 0. 93 745 139 0.98 Tle32 0.20

7450 0.15 74 152 0. 38 74279 0.36 74LS51 0.15 J.fLS I6-1 0. 51 74LS'90 1.02 745 140 0.26 UC42 0. 72
a:
108
CIRCLE 72 ON FREE INFORMATION CARD
10 Megahertz
Uses standard 2;.1" adding
machine tape
or carbon less paper
HM307
SINGLE TRACE
OSCILLOSCOPE
IDEAL SERVICE INSTRUMENT
TIME BASE 0.2 p.s - 2.0 slcm On ly
LPS-TRIGGER COMPACT $404.25
BUILT-IN COMPONENT TESTER
1-9 10 up 100 up
$3.45 $3.10 $2.90
3.90 3.20 3.00
3 .50 3.00 2.80
5.90 5.30 5.00
7.90 7.30 7.00
21 .90 20.90 19.90
2114 (200ns)
2114L3
4116 (200ns)
2708
2716 (5 V)
2732 (350ns)
The Unique NewPrinter That Gives
You All These Exciting Features.
MINIATURE DOT MATRIX
IMPACT PRINTER
- , MODEL
DP-822
28.91
28. 9 1
26 .53
26 .53
22 .34
22 .34
4.05
3.00
3.21
2.89
2.44
2.93
MRF314
MRF3 14A
MRF4 54
MRF454A
MRF455
MRF455A
MRF475
MRF901
MRF9 04
MRF91 1
MRF8003
MRF8 004
6800 MC6860 P 10 .80 10 .70 808OA-8085A ZSOQO RS23 2
SERIES MC6862 P 11 .80 Pe506 9.70 and Support Ie's SERIES CONNECTORS
MC6800P $ 5.90 MC6875 L 6.90 P6506A 10 .70 PS080A 55 .00 ZBQ01 DC $ 150.00
MC6801Ll 6 5.84 MC6880AP 3. 14 P650 7 9.70 PS085A 10 .00 zao02DC 140 .00 DB25P mil e 2.95
MC6802 P 11.50 MC6881P 8.9 1 P6507A 10 .70 P8212 2.30 Z8065 DC 99 .00 DB25S feml le 3.60
MC6805U2P2 30 .72 MC6882AL 6.13 P6512 10 .70 P82 128 4.50 Z80 73PC 25 .20 HOODS 1.75
MC68 08P 13 .90 MC6885P 2_72 P6512A $16.60 P8216 2.10 Z8104PC 4.90
SET 7.50
MC68 09P 36.50 MC6886P 2.72 P6513 9.70 8224P C 3.10 Z8107PC 4.90
MC6821 P 3.46 MC6887P 2.72 P65 13A 10 .70 P8226 2.40 Z8108PC ' .90
MC6828P 9.90 MC6888P 2. 72 P6514 9.70 8228PC 5.80 Z8120DC 5.60 NMOS MICRO-
MC68 40P 12 .22 MC6889P 3.14 P6514A 10 .70 P823 7 22.00 Z8121 PC 3.65 PROCESSOR
MC68 43P 45 .39 P6515 9.70 8238PC 6.00 Z81270C 19.60 MC68000L $ 347.73
MC6844P 4 5.39 6502 SERIES P6515A 10 .70 P825 1 6.40 Z8133PC 2.50 MC68000L4 29 1.8 7
MC6845P 22 .00 P65 02 $ 6.40 P6520 5.90 Pa253 13 .00 Z8136PC 5.20 MC68000L6 319.80
MC6846Pl 39 .90 P6502A(2MHl l 7.90 P6520A 6.40 Pa255A 6.10 Z81 40 PC 3.00 MC68488P 19 .80
MC6846P 3 P6502 B{3MHll 13.50 P652 1 6.20 Pa257 11.90 ZS144PC 3.60 MC68705P3L 11 1.72
MC6847 P 16 .06 Pe 503 9.70 P652 1A 6.80 P82 79 15.90 ZS148 PC 3.00
MC6850P 3.40 P65 03A 10 .70 P6522 6.40 DP830 3 N 3.90 Z81648PC 24 .40 NMOS EPROM
MC6852P 3.50 P6504 9.30 P6522A 11 .90 DP8304 BN 3.90 Z8165PC 7.65 MCM68708C5 32 .26
MC6854P 32 .26 Pe504A 10 .70 P65 32 7.80 DP8307 N 3.90 Z8166PC 7.65 MCM68764C 309.89
MC6859L 277.90 Pe505 9.30 P6532A 10.20 DP8308 N 3.90 Z8173PC 2.10 MCM687 66C 309. 89
linear IC and Volt age
Regulator Databook
214 peq es .. . . $4 .50
ANCRONA HAS INTERSIL IC's
IMll 00 1Pl ' 13.95 ICM7213-1PO SiS.n ICM7227-l'lJl 14.415
lMl l 02 1PL 14.50 lCM721 15-1PQ 13.95 ICM7227-Cl1>1 12.40
lCM7038-A1PA 3.00 ICM7211-A1Jl 32 .00 ICM7227-1Jl 14.415
ICM7038 C1PA 3.00 ICM7211- B1Pl 26.65 ICM724O1J E ..90
ICM7046 14 ,9$ ICM7211-C1J1 26 .65 ICM72411P A 3.40
ICL71C03 ACPl 13.80 ICM7216-0 1Pl 21.40 ICM72421JA 2.05
ICl7101 CPL 15.50 ICM7217-A1Pl 11.25 ICM726o-1JE 1.00
ICL7107 CPl 15.00 ICM7217 1I1Jl 12.40 ICM721o-1JE 5.26
ICL7111-CPL 11.70 ICM7217 -C1Pl 10.35 ICM7270-1PL 5.85
tCL7117CP l 17.70 ICM7217-1Jl 12.40 ICM75551 PA 1.20
ICM720 1-10R 2.25 ICM7211C1J l 10.75 ICM1556-1PO 2.25
ICM72051PG 13.00 ICM7223 1Pl IC17815O- CP.,A 3.00
lCM720I-CJ PE 5.115 ICM7224-1P l 11.25 ICLIOHCCJ O 4.70
ICM7207-A1PO I .SO ICM7225-1PL 8.SO ICLI04I CCPE 21.10
ICM7208-1 Pl 11.00 ICM7221-A1J l 32.00 ICLIOIt CCQ 2.80
tCM7201-1PA 3.15 ICM7221 -B1Pl 21.65 ICLI211 CPA 2.60
lCM721' -1P L 8.40 ICM7227-A1P1 12.40
Z-80
SERIES
4.0 MHz
Z-8QA Cpu $ 9.95
Z-8QA CTC 7.95
Z-BOA Pl 0 7.95
Z-BOA-DART 18.85
Z-BOA-DART-9 16.50
Z-OOA-51010 30.50
Z-OOA-S1019 23.40
Z-8QAOMA. 24.90
VOLTAGE REGULATORS
74LS03N .23 LM300H $ ,70 lM34Q12 K 1.35 78L15 CP .55
7.lS04N . 26 LM300N 1.95 l M340 15K 1.35 78118 ACP .60
74lSOBN .27 LM304H .9 5 lM340 -18 K 1.35 78118CP .55
74lS10N .24 lM305H .75 lM340 24K 1.35 78L24 ACP .60
74lS11 N .31 l M309 H 1.4 5 LM350 K 5.40 78124CP .55
74lS20N .24 l M30 9K 1.25 LM353 5 7.50 79l03ACP 1.50
74l S22N .34 LM317H 1. 70 LM353-8 7.50 79 L03CP 1.00
74lS26N .39 LM3l7 To220 1.60 LM353 -12 7.50 79L05 ACP 1.50
74l S27 N .29 LM317 K 2.45 l M3 531 5 7.50 79lD5CP 1.00
74l S32N .34 lM320-SK 2 ,20 l M3531 8 7.50 7911 1ACP 1.50
74lS37N . 36 lM320 -6 K 2.20 lM353-U 10 .00 7911 2CP 1.00
74LS4 0N . 34 LM320 8 K 2. 20 LM723CH .50 79 115ACP 1.50
74LS42N .4 5 LM320 1 2K 2. 20 LM723CN .50 79L15CP 1.00
74 LS73N .38 LM320 1 5 K 2.20 78 L05ACP .5 5 79118ACP 1.50
74L 5 74N .54 LM320 -18K 2.2 0 78L05CP .50 79118CP 1.00
74LS8 6 N .45 LM320-24K 2.20 78L08ACP .60 79l24ACP 1.50
74L5 90 N . 44 LM323 K 4.70 78L08CP .5 5 79 l2 4C P 1.00
74 L59 3N .4 2 LM340 S K 1.35 78 11 2ACP .60 MC14 63G 4.90
74LS109N .52 LM340 6 K 1. 3 5 78112CP .5 5 MC14 66L 9.90
74LS 11 2N .4 2 LM34O-8 K 1. 35 78115ACP .60 MC1468G 5.90
VOLTAGE REGULATORS
74L51 26N .54 T0220 (PI. ltic) To220 (PI..tic) 78M05CT $ .85
74LS13 2N .59 780 5CP $.90 790 5 CP $.9 5 78M06CT 1.45 LowCost
74LS136N .48 78 12CP .90 79 12CP .95 78M08CT 1.45
::: :: 78M1 2CT 1.45 Disposable printing head
J 4L5 14 5N 1. 20 7824CP .90 79 24 CP .9 5 78M15CT 1.4 5 Simple interface
74LS 151N .44 (O".1:l ..pl n . ....n' l er 10,," , r. pI.c. ....n! I QI 78M18CT 1.45 Handles any type font . 21-column printing at 25
... Needs only one 12 .voh DC lines per second
power supply Easy to install and maintain
SILICON GENERAL Motorola's
Complete Model DP-822 $70.00
77LLS S' , 670. NN 2.662 5 apto Trtac Dot Matrix Printer Control/Drive Card
Model DP-822-08B $125.00
MHo. H R MEG
Une
74 LS19 1N .89 MRf208 16.0 6 r,,.. MA Yotto
74 LS193N .89 MRf209 19 .27 MOC300' Hi 250 $2.20
74LS194N .85 MRf2 12 22 .48 MOC3010 250 2.71
74 LS195N .65 MRF2 15 40 . 15 MOC301 1 5 250 2.11
74LS22 1N .85 MRF216 43 .29 MOC3020 15 400 3.15
74LS240N .95 MRF2 21 15 .22 MOC3021 400 352
74LS 24 1N .90 MRF222 17. 67 MOC3030 15 250 3."
74LS243N .99 MRF223 18 .50 M0C3031 I 250 5.22
74 LS24 4 N .9 5 MRF22 4 21 .65 Z.,-o Croning
;:;g

::; 1-,;;.;....;;..;;..;.;,;,.;.,.:.;.;...:..;;.;,;.;.;..,;;.;.::-=:::-:-:-:,;;.:;.;.::..::-'::"::-_ ...
74LS26 6N .48
74LS2 73 N 1. 3 5
74LS299N 2.60
74LS365N . 75
74LS36 6N . 79
74LS367N . 70
74 LS37 3N 1.45
74LS 3 74 N 1.40
74 LS3 77 N 1.40
74 LS381 N 2.90
74LS490N 1.80
...... .-
3'fz DI ft LED Mullimeter
OM 235 .... $ 69.95
3'fz Dlgft LED Mullimeter
OM 350 .. ... 99.95
3'fz 01 ft LED Mullimeter
POM 35 ...... 39.95
80ft LED H Held Fnq Meter
PFM 200. . 99.95
Si Ie Trxe Portable 0 e
SC 11 0...... 259.00
8 DI ft LCD Fnquency Meier
TF 040 ...... 199.00
8 Olgft LCD H dHeld Fnq Miler
TF 200 299.00
100 KHz Function G r
TG 100 ...... 159.00
2 MHz Function G era!lIr
TG 102 ...... 299.00
5 MHz Pulse Ge entor
TG 105 ...... 199.00
3'fz 0 ft LCD Bend! M Ier
TM 351 ..... 199.00
3'fz 0 ft LCD B Mulllmeler
TM 353 ..... 159.00
3'fz Olgft LCD HindHeld Mullimeter
TM 354 ..... 79.00
600 MHz Prescaler
TP 600 . . 79.00
sc no
lM 353
THANDAR
INSTRUMENTS
ORDER ANY TWO
INSTRUMENTS &
TAKE A 3% DISCOUNT
I n tarsil LED or LCD
3 Y:z DIGIT PANEL
METER KITS
BUILD A WORKING DPM I N HOURWITH
THESE COMPLETE EVALU ATION KITS
Test t hil le new parts for yoursil if wit h Inter ll r s low
cost pr ot otyplng kIts. compi lite wllh N Oconverte r and
LCD di s play {710 6l or LEDd ls pllV (710 7). Kits provldil
I IImat llnl ls. Inti PCboard. for I functionin g pan el meier.
ICL7I DSEY(LCD) . ... U44li ICUlIHEY(LED) . . $11.11
2.5 MHz
Z-8QCPU $ 8.95
Z-8Q-CTC 6.50
...--------------------......j Z-80-PIO 6.50
Z-80- DART 15.45
Z.8().DART-9 13.50
zeo-sioo 24.40
Z-ao- S1Q!9 18.20
Z-80-DMA. 20.10
>
C
o
C
CJ)
-I
...
(0
00
...
109
MC401.P . 52
MC4024P 5.75
MC402I P 3.U
MC4044 P 5.75
MC4311L 11.72
MC46HNCPl 3.18
MC1311P 2.150
MC.,1P 2.73
MC10104P t2
MC1010tL 1.24
MC10111l 1.24
MC10111P .12
MC10123l 2.31
MC10124 L 3.01
MC10121l 2.150
MC10131P 3.04
MC101371 253
MC101",. 4.14
MC101ltl 3 27
MC10lt5L 2.52
MC10lt1P 22.51
MC10218L 1. 88
MC1023 1P 581
MC12040 P 11 .9 9
MC120elP 5.75
MCl 4410P 22.HI
MC14411P 17.13
MCl4412VP l U S3
MC14435VP 11.53
MCl4457P 180
MCl4458P 13.73
MCl4490FP 5 80
MCl44IOVP 4.24
MC1'5,. 3M
MC34Q04P 3.52
TUCSON
45 18 E. Broadway
Tucson. AZ 857 11
(602) 881 -2348
MC145tCl $1.44
MC1451CP l .11
MC14"Pl 1.17
MC145'PI S 1.21
MC1. " a 4.24
MC1411R 7.19
MC14UL 1.51
MCl 48I AL 1.48
MC14atL 1.48
MC1489P 1.39
MC1414 l 8.04
MC14KL 5.28
MC14HG 1.10
MC1104 L 2.27
MClloeP 1.31
MC110t P 1.36
MC1.10P 1.3'
MC30Ul 5.n
MC3l02L 3.09
MC3302P .IS
MC3303 P 5.10
MC3325 P 2.10
MC3340P 2.10
MC33150P 1.00
MC3370P 3.72
MC3403 P 1.68
MCJ40t5P 2.42
MC340IL 3.155
MC3411L 31.42
MC3423P l 1.11
MC343I L 4.33
MC344IAP 5.0
MC3470P 12.84
MC)47tPl 3.1'
MC350n 18 12
MC1309 po $2 .11
Me nl 0 P 2."
MC1330A1P 1.80
MC134I P 1.72
MC1350P 1.115
MC1351,. 2.10
MC13152 P 2.01
MC13I5I5 P 2.10
MC1357P 1.55
MC135IP 1.50
MC1364 P 2.01
MC1372P 1.48
MC137]P 5.19
Men' l P 1 .44
MC1403AP 3.78
MC1403AU 11.0 7
MCl403 UDS 4.23
MCl 406 L 15.21
MC140eLi 2.14
MC1401 L7 4.75
MC140eLJ 4.64
MC1401P1 4.40
MC1413P 1.33
MC1431CU 7.99
MC1437L 3 99
MC1437 P 3.14
MC143tG 491
MC1439 l 4.12
MC143t Pl 397
MCl 445 G 420
MCl 4451 4.15
MC15Pl .72
MCl445UDS 1.77
MC145fiG 2.25
MC14i5SPl UN
SUNNYVALE
1054 E. EI Cami no Real
Sunn yval e, CA 94087
(408) 243-4121
$1.81
HZ
1.54
3.34
2.23
. 73
.ZI
1.03
1.57
3.20
3.20
1.11
3.20
1.111
,..
z..
,..
5.10
2.27
Z.27
2.41
1.00
1.00
5.85
35'
1.00
1.3 6
3.17
2.14
2.41
1.00
ZZ7
,..
.5O
3.72
ANCRONA HAS MOTOROLA IC's
ro pe.
SANTA ANA
1300 E. Eding er Ave .
Sant a An a. CA 92705
(714) 547-8424
KIT $3 1. 50
. Oi"S'Pi ay Range -36dBto +5dB
Float ing or Gradual Output Indicating
Kit includes t ransistors. Jeds, ceoect-
tors. resistors. PC Board. and si lk
sc reened met al front pan el
PORTLAND
1125 N.E. 82 nd Ave.
Portl and. OR 97220
(503) 254-5541

--
.....
S Wi TCHABLEXl and Xl 0 Attenuation Factor
KEV ADDITI ONAL FEAnJRES: l OOMHz bandwidt h . Heavy
duty tip Break res ista nt cent er conductor . Slend er. flexible cab le
6ft. cab le lengt h Wide compe nsa tion ra nge Fits all scope s
Ground referenc e can be activated at tip Includes SPRUNG
HOOK. I.C. TIP. BNC ADAPTOR. INSUlATING TIP and TRIMMER
TOOL ACCESSORIES.
Universal Oscilloscope
Probe
CIRCLE 57 ON FREE INFORMATION CARD
HOUSTON
2649 Richmond
Houston . TX 77098
(713) 529-3489
VISITASTORE NEARYOU TODAY - WI st ock 1 11f\l' II I. etiu of T.chniell Books. Diseretl Compon. nts. Int. grlt .d Circurts. Test Equipm.nt In d EI. etronic Supplies.
Flasher
LED
Red LED and
F1..her IC Chip
in One: Pa cka ge
FRL-4403
ONLY
sze.,
CULVER CITY
11080 Jeff erson Blvd.
Culve r City. CA 90 230
(213) 390-3595
* MICROPROCESSOR CRYSTALS *
f ll EO flUO FIl EQ
IMHz) CASE f>IH ""ICE IMHzl CASE " IN .. Il ICE 1101Hz) CASE " , H f>IlICE
I." IlraJ tvM $UI 4.UU MCll mA $1.11 I' " NCII CY1U $4.75
U4J2 lien eDlA 15' U. MC1' rnA ' " 11.1' Nell ty lU 475
l ." Nen tvU ' .U i N ' MCII ml tI. lUll NCII a t.. 4.75
14511 lIeuml 1.21 i .lln MCII CISe 1.11 lIUtlMClIenU 4.75
l U ll lieu enl I .N 1 M MCII all ' " It.M IICII enu 5.25
un NO] enD I .M 1.144 IICII me I n Ull4 IICII mJI 521
UI lIeli enA I N ' N MCII mG I N 11." MCII en", ' .15
4414 lIeli Cl4C 1.11 II .M IICII a llA 4.n JlIl MCII CYJlA ' .15
455 lIeli Cl41 I II 14.11111 Mell al4A 4.75 111" Mell alMA 1.15
P.O. BOX 22 08 R CULVER CI TY. CA90230
I PHONE ORDERS (213) 641-4064 1
......mO!der SIDOO AOdS2 00 tl c_po$1l1l t Il'ldNlldMlg Mn l.. C,*"
_ "" SAwtk Ollllll ""wftWt , _ dIJrttc"d_ bII. Il'IteftIIr* nullliMf and
'::: ;.a:I: __
-.ufKt.. .
ATLANTA
3330 Piedmon t Rd. N.E.
At lanta. GA 30305
(404) 261-7100
fA'\
'5J MAIL ORDER
IFLUKE!.
,,Analyst' ,
26Ranges / 7 Functions
Accurate to 1%
Auto Zero/ AutoPolarity
ChecksLeakageto 10MD
Comes withCase
8020A $189.00
zip code
HERE
LABel
ATIACH
1---------1
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I I
L ,
state
Micro Ace 107
Micro Management Systems Inc 96
Mountai n West.. 76
NRI, Schools 8-11
NTS, Scbools 36-39
Net ronics
Researcb & Development .. 29
Obio Scientific 1
Omega Sa les 13
Paccom 76
Panavise 28
Your new ad-
dress and zip
code
Your o l d ad-
dress and zi p
code
MOVING?
Six wee ks' no-
tice
Don 't miss a
single copy of
Radio-Elec-
tronics. Give
us:
Poly Paks 78, 106
Radio Shack 80
Ramsey Electronics 97
Robotic Age 24
Sabtronics Cover 3
HW, Sams & Co, Inc 30
Satellite Comput er Services 79
Shure Brotbers 30
Simple Simon 84
Sinclair (Thandar Electronics) 40
Solid State Sales 92
Spacecoast Researcb 79
AW, Sperry 27
Sony Video 17
Surplus Electronics 89
Triplett 73
Viz 33
Wersi 76
11 Zenitb Back Cover
15
46
48
41
Mall to: Radio-Electronics
SUBSCRIPTION DEPT., P.O. BOX 2520,
BOULDER, COLO. 80322
city
42
25
23
68 & 69
36
9
40
20
47
28,27
45
4
21
30
64
address
name (please pr int)
Page
International Components 108
Int ernati onal Crystal Mfg 24
Int ernational Electronics 96
JDR, Mlcrodevlces 98-99
J ameco 86-87
Jensen Tool, Inc 78
Keithley Instru ments Inc 77
MCM, Audio 93
McGee Radio's 82
3 Mesbna Inc 106
67
66
62
63
19
18
29
44
ADVERTISING INDEX
14 AMC Sa les 84
31 Actire Electro nics 81
Advance Elect ronics 7
13 Advanced Microcomputer
Product s 94-95
32 Albia Electronics 25
56 AUElectronics 88
57 Ancrona 109
Karel Bar ta 82
12 Beckman Electro Products Group 23
24 B & K Pr ecision 74
Bulle!. 100
33 CRR, Associates 106
CIE, Cleveland Institute of
Engineering 18-21
71 Central Point Soft ware : 107
16 Chaney Electronics 88
Command Product ions 79
55 Communications Electronics 26
58 Concord Comput er Products 104-105
2 Contact East ., 110
Cook' s Insti tut e 79
22 Tbe Cooper Group Cover 2
Dage Scientific 82
Devtronix Or gan, Inc 82
5 Digi-Key 83
34 Eico 28
49 Elect ronic Specialists, Inc 78
Electronic Technology Today 74
43 Ent erpri se Development .. 76
35 Etco 82,92
Fair Radios 96
Fanon 84
59 Fluke 5
Fordham 104
17 Formul a Internat ional 90-9 1
Future Tech 32
37 Gladstone Electronics 84
38 Global Specialties 2
Global TV 79
60 Godbout 88
Grantbam College of Engineering 29
65 Hal-Tronics 88
61 Hanl ey Engineering 85
7,8, Heatb 14-15,35,71
51,52,53,54 The Heath Group 100-103
39 Hitachi 31
Informat ion Unlimited 82
Free Information Number
RADIO-ELECTRONICS does not assume
any responsibility for errors that may
appear in the index below.
310 $70.00
Contact East
Catalog
Over 10,000Products
Hard-To-FindTools
Fully Illustrated
160Pages-
CompletePricing
Catalog $2.00
Economy V-O-M
AC/DC-0-10,50,250
DC Current-0-2.5,
5,25,250mA
Measures Hlto 500KD
Accuracy- 3%DC,
4%AC
Comes withBattery,
Test Leads, and Manual
\lIZ WV-516B $25.00
e
Portable ~ ~ - - - " "
Oscillo-
scopes
ThreeModels
MS-15/15MHz SingleTraceTriggeredScope$389.00
MS-215/ 15MHz Dual TraceTriggeredScope 497.00
MS230/ 30MHz Dual TraceTriggeredScope 649.00
'l'lr.TRIPLETT
Miniature V-O-M
20,000DIV DCSensitivity
5,000DIV AC Sensitivity
0,20,000,200,000-
2MD-20MD
3%DC, 4%AC
Accuracy
Comes withBattery,
\
Test Leads,
and Manual
110
CIRCLE 2 ON FREE INFORMATION CARD
Sabtronics.
Anentirerange of tow-cost,
top-quality instruments.
A. 2010A- $99.00*, B. 2015A-$119. 00*, C. 8610A- $119.00*, D. 5020A - $129. 00**,
E. 8000B-$239.00**, F. 2035A- $79. 00*, G. 2037A -$99. 95*
Prices subject to change without notice.
Sabtronics revoluti onized the
market with the first low-cost,
high-performance Digital
Multimeter. Now we have an entire
range of outstanding instruments in
a reasonable range of prices. In fact,
nobody can beat us in our
price/performance ratio. And we
can sell at a lowprice for some very
good reasons. Our engineers design
high performance products to be
built at a lowcost. And we refuse to
stick on high mark ups. Plus we
make sure your price stays low by
selling directly to you. Because we
sell so many instruments, we don't
have to charge a high price.
Naturally, we also offer all the
helpful accessories you might want.
And all our products are under
warranty for good quality and high
performance. In addition, you get
from us the same quality aftersale
service as any high priced
instrument manufacturer. With
Sabtronics instruments available,
there's no need for you to spend a lot
of money to do highly accurate
testing and measuring.
2010A 3'h Digit LED DMM
2015A 3'h Digit LCD DMM
8610A 600 MHz 8-Digit Frequency Counter
8110A 100 MHz S-Digit Frequency Count er
5020A 1Hz to 200k Hz Function Generator
8000B 1 GHz9-Digit Frequency Counter
8610B 600 MHz 9-Digit Frequency Counter
2035A 3'h Digit LCD Handheld DMM
2037A 3'h Digit LCD Handheld DMM
*price in kit form. Also available factory assernbk
test ed,and calibrated. Call us for prices.
**price fullyassembled, test ed, and calibrated.
Call us for more information:
(813) 623-2631 (gamto 5pmEST)
Making Performance Affordable
s a b ~ W J
5709 N. 50th Street Tampa, FL 33610
Zenith Radio Corporation /Service, Parts & Accessories Division /11000 seymour Avenue/ Franklin Park, Illinois 60131
Program.
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The quality goes i n before the name goes ori e
Inventory control- that's the name of the game today!
And Zenith 's Instant Parts Program (ZIP) is the way to play it
safe, sure .. .and money-wise. Because with ZIp, you've got
Zenith's most frequent ly needed exact replacement parts where
you want them when you want them.
Also with ZIp, slow-moving stock numbers are periodicall y
replaced with new, more popular parts thru periodic checks
by your Zenith distributor salesman. As a result, your original.
investment is protected and your inventory of Zenith exact
replacement parts is current.
And best of all, today you can add a little ZIP or a lot of ZIP
to your inventory control of Zenith parts.
For a little ZIp, you'll want ZIP-50 - the top 50 Zenith parts
available with or without System 3 components. If you want
more ZIp, get ZIP-100 - the most active 100 Zenith parts now
available with or without System 3 components.
Call your Zenith distributor now for the ZIP program that
best suits your need. Four to choose from!
ZIP - it's the easiest, least expensive, most versati le
inventory control system ever devised by Zenith for TV service
technicians! Call your Zenith distributor now!
Call your Zenith distributor now for a
speciallimited-time-only introductory offer
on ZIP- Zenith's Instant Parts ProgramI
For your own reputation and in your customers' best interest,
always service with Zenith exact replacement parts.
Speoiallimited-time
introduotoryofter
onZIPI