Digital Volume Control


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

Schematic for amp

Parts

Part
Total Qty.
Description
Substitutions
C1 1 0.1uf Ceramic Disc Capacitor
U1 1 DS1669 Digital Pot IC (See Notes)
S1, S2 2 Momentary Push Button Switch
MISC 1 Board, Wire, Socket For U1

Notes

  1. U1 is available from Dallas Semiconductor.
  2. S1 turns the volume up, S2 turns it down.
  3. The input signal should not fall below -0.2 volts.
  4. 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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