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Monday, August 16, 2010

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
C110.1uf Ceramic Disc Capacitor
U11DS1669 Digital Pot IC (See Notes)
S1, S22Momentary Push Button Switch
MISC1Board, 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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