This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project.

Schematic:How to build Simple Digital Volume Control - circuit diagramParts:
  • C1 0.1uf Ceramic Disc Capacitor
  • U1 DS1669 Digital Pot IC (See Notes)
  • S1, S2 Momentary Push Button Switch
  • MISC Board, Wire, Socket For U1
  • U1 is available from Dallas Semiconductor.
  • S1 turns the volume up, S2 turns it down.
  • The input signal should not fall below -0.2 volts.
  • Using a dual polariity power supply (+-5V works fine) will cure most clipping problems. You will have to check the data sheet for the correct pins to connect your voltages.

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