Volume Control Circuit

jacky October 16, 2018 5 Comments

Digital Volume Control Circuit

All audio amplifiers have some mechanism to increase and decrease volume. Most such mechanisms involve mechanical parts like a potentiometer. Here this project is to create an audio controller which works digitally. This is a very simple project which uses two switches and an IC to electronically control the audio output from an amplifier.


This is the circuit diagram of a digital volume controller for any sort of audio amplifiers or almost any circuit where a mechanical potentiometer is there(conditions apply). Simple and low cost, the heart of the circuit is DS 1669 digital potentiometer IC from Dallas Semiconductors. The circuit has no external components other than two pushbutton switches and a capacitor.


S 1 increases the volume & S2 decreases.

The input audio signal must be not less than -0.2 Volts.

If some clipping problem occurs, use a dual power supply of +5 & -5V.( Not shown in the figure).In this situation connect +5V to pin 8 & -5V to pin5 of IC DS1669.

Volume controller Circuit Diagram

Volume Control Circuit

Pin assignment & description of DS1669

DS1669 IC Pin Configuration

We have some other Audio circuits that may interest you, Take a look:

1. Active Crossover Circuit

2. Stereo Sound Level Indicator

3. Three Channel Audio Splitter

4. Low pass filter for Subwoofer

5. Five Band Graphic Equalizer

  • Rahul
    March 10, 2013

    whats the value of c1

    June 5, 2012

    What is the layman’s value of the capacitor and show the simple discription

  • saritha p a
    November 27, 2011

    a single pulse width input over the UC Dc and D terminals will cause the wiper position to move 1/64 of the total resistance.so when we connect swich in tha UC and DC terminals ,we have to press 64 times to reduce the volume to min and vice versa…..so how can we reduce this much delay in incerasing and decresing the volume…?????

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