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Digital volume control
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Digital volume control circuit schematic

Controls
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Digitals

momenameNovember 30, 2015November 30, 20153
Digital
Control Systems, Digital Volume Control

This is digital volume control circuit that Can be applied to the normal
volume of a power amplifier. When press switch S1 adds up the volume and press
switch S2 to reduce the volume down.

How it works
IC1 is a 555 CMOS Timer Single IC will be
connected in astable flip-flop model as pulse frequency generator up / down to
input pin of the counter IC2-74LS193, through push-bottom switch S1 (Up) and
S2(Down).

Changing wide of pulse signal from IC1 may replace R1 with
potentiometer.

To begin with, when we press the switch S1 (increase sound) binary output
will be add up and when press switch S2 (Reduce sound) the binary output will
low down. The maximum counter to count to 15 (All output are logic “1” or
“Higher”) and lowest is the counter 0 (All output are logic “0”).

The output ABCD of the counter IC2 will use to control both gate. Which is
bipolar analog switch (IC3 and IC4 – CD4066). In either bit output are “High”
logic. The resistors connected in series are the resistors R6-R9. In left signal
channel and R10-R13 for right signal channel.

In this way, the control output of sound signal to the output of the power
amplifier. The switch S3 is used to reset the output of the counter to 0000. For
this reason, to make adjustments to the volume of both channels is low.

Parts you will need
Resistors ¼ W +-5%

R1_________________150K
R2_________________330K
R3, R4, R5__________550
ohms
R6, R10____________1K
R7, R11____________2K
R8, R12, R14,
R15___4.7K
R9, R13____________8.2K
Capacitors
C1_________________1uF
25V Electrolytic
C2_________________0.1uF Ceramic
Semiconductors

IC1_________________IC-7555 CMOS Timer Single 8-Pin Plastic Dip

IC2_________________IC-74193______Synchronous Up/Down 4-Bit Binary Counter with
Dual Clock
IC3, IC4_____________CD4066 Quad Analog
Switch/Multiplexer/Demultiplexer
Others
S1, S2, S3 switch normally open
pushbutton

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About The Author

momename

3 Comments

Hakan OKTAY
December 6, 2015

CD 40193 has an integrated name. Why 74193

MR OHM 1970
December 16, 2015

74193=TTL(Operates @5v) while 40193 is CMOS and operates over a wide range
of low voltages.also CMOS has low Power Consumption and operates over a wide
range of temperatures,I hope This Helps!!!

nay lin December 19,
2015

thank ! alot

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