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JPS57166744A - Am electronic tuner circuit - Google Patents

Am electronic tuner circuit

Info

Publication number
JPS57166744A
JPS57166744A JP5287181A JP5287181A JPS57166744A JP S57166744 A JPS57166744 A JP S57166744A JP 5287181 A JP5287181 A JP 5287181A JP 5287181 A JP5287181 A JP 5287181A JP S57166744 A JPS57166744 A JP S57166744A
Authority
JP
Japan
Prior art keywords
wave
band
broadcase
control signal
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5287181A
Other languages
Japanese (ja)
Inventor
Makoto Ichiji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP5287181A priority Critical patent/JPS57166744A/en
Publication of JPS57166744A publication Critical patent/JPS57166744A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To reduce the cost and to miniaturize the titled circuit by composing the circuit of a pair of local oscillating circuits for receiving plural broadcast wave bands. CONSTITUTION:When a low wave (LW) broadcase wave band is received, a control signal with 0V is applied to a control terminal 7. A transistor (TR) Q1 is connected by the control signal and diodes D5, D6, D12, and D13 are also connected. On the other hand, TRQ2 is disconnected and diodes D1-D4, D10 and D11 are also disconnected. The LW band broadcase wave is sent to an LW tuning circuit through an antenna coil L5 for LW band broadcast wave. After 2 coils, a medium wave (MW) band secondary coil L3 and an LW band secondary coil L4, have been induced, the LW broadcase wave is supplied to a frequency mixer 12. When an MW broadcase wave band is received, a control signal with 0V is applied to a control terminal 6. The frequency mixer 12 can be used also for the MW band in common.
JP5287181A 1981-04-06 1981-04-06 Am electronic tuner circuit Pending JPS57166744A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5287181A JPS57166744A (en) 1981-04-06 1981-04-06 Am electronic tuner circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5287181A JPS57166744A (en) 1981-04-06 1981-04-06 Am electronic tuner circuit

Publications (1)

Publication Number Publication Date
JPS57166744A true JPS57166744A (en) 1982-10-14

Family

ID=12926934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5287181A Pending JPS57166744A (en) 1981-04-06 1981-04-06 Am electronic tuner circuit

Country Status (1)

Country Link
JP (1) JPS57166744A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61199931U (en) * 1985-06-04 1986-12-15
JPS6232645U (en) * 1985-08-09 1987-02-26

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS546018B2 (en) * 1975-03-10 1979-03-23

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS546018B2 (en) * 1975-03-10 1979-03-23

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61199931U (en) * 1985-06-04 1986-12-15
JPS6232645U (en) * 1985-08-09 1987-02-26

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