15-Step Digital Power Supply
15-Step Digital Power Supply
15-Step Digital Power Supply
IDEAS
and 35V.
The first section of the circuit comprises a digital up-down counter built
around IC1 a quad 2-input NAND
schmitt trigger (4093), followed by
IC2 a binary up-down counter (4029).
Two gates of IC 4093 are used to generate up-down logic using push buttons S1 and S2, respectively, while the
other two gates form an oscillator to
provide clock pulses to IC2 (4029). The
frequency of oscillations can be varied
by changing the value of capacitor C1
or preset VR1.
IC2 receives clock pulses from the oscillator and produces a sequential binary
output. As long as its pin 5 is low, the
counter continues to count at the rising
edge of each clock pulse, but stops counting as soon as its pin 5 is brought to logic
1.
Logic 1 at pin 10 makes the counter
to count upwards, while logic 0 makes it
count downwards. Therefore the counter
counts up by closing switch S1 and counts
NAVEEN THARIYAN
RUP
ANJA
NA
IDEAS
TABLE
Binary
output
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Equivalent
dec no.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LED4
R14 (W)
Shorted
Shorted
Shorted
Shorted
Shorted
Shorted
Shorted
Shorted
1500
1500
1500
1500
1500
1500
1500
1500
LED3
R13 (W)
Shorted
Shorted
Shorted
Shorted
820
820
820
820
Shorted
Shorted
Shorted
Shorted
820
820
820
820
LED2
R12 (W)
Shorted
Shorted
470
470
Shorted
Shorted
470
470
Shorted
Shorted
470
470
Shorted
Shorted
470
470
LED1
R11 (W)
Shorted
220
Shorted
220
Shorted
220
Shorted
220
Shorted
220
Shorted
220
Shorted
220
Shorted
220
R2' (W)
0
220
470
690
820
1040
1290
1510
1500
1720
1970
2190
2390
2540
2790
3010
Vout (V)
1.25
2.27
3.43
4.44
5.05
6.06
7.22
8.24
8.19
9.21
10.37
11.39
11.99
13.01
14.17
15.19
Working
When the power is switched on, IC2 re-
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project done!
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this project at your college.
Also, if you are in need of the hardware kit for
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