Digital Volume Control Circuit
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 figure).In this situation connect +5V to pin 8 & -5V to pin5 of IC DS1669.
Volume control Circuit Diagram.
Pin assignment & description of DS1669
We have some other Audio circuits that may interest you, Take a look: