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.
|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|
- 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.