This circuit could be used for replacing your manual volume control in a stereo amplifier by digital volume control to control the sound by two  button

 

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


Parts: 

 

Part 

Total Qty. 

Description 

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 polarity 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.

FEATURES:

  • Replaces mechanical variable resistors
  • Electronic interface provided for digital as well as manual control
  • Wide differential input voltage range between 4.5 and 8 volts
  • Wiper position is maintained in the absence of power
  • Low-cost alternative to mechanical controls
  • Applications include volume, tone, contrast,brightness, and dimmer control