Digital Volume Control


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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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Comments

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satpambobo
Digital Volume Control
Friday, August 05, 2011 9:38:53 PM
i dream use binary count up and count down IC (74??? or 40???) to control R2R Ladder Digital to Analog Converter 4 bit which Build from Resistors and Digital Switch 4016 ( internal 4 switch). this only my design not tested yet, so you have volume step 0..15. this is a challenge, go ahead build this.. :)
birungi Travol
Digital Volume Control
Tuesday, March 08, 2011 6:52:04 AM
I am in Uganda but it is difficult to get (DS1669), can please get another substitute for that DS1669.
awais
Digital Volume Control
Thursday, October 14, 2010 8:12:57 AM
This ic is not available in pakistan ? can we use another ic in this circuit
fernando ori
Digital Volume Control
Sunday, August 08, 2010 12:22:53 PM
Can I use This Circuit as a remote volume controller?as far as 300 meters with no 60 hertz hum?Is this IC available in the Philippines now?thank you and more power!
anonymous
Digital Volume Control
Thursday, March 25, 2010 10:56:46 PM
Jason, use 7805 or 7905 to reduce voltage to 5v
anonymous
Digital Volume Control
Friday, February 26, 2010 10:03:03 AM
I was going to try this circuit but the DS1669 is too expensive over $7 each. I am going to use the AD5228 at about $1 a pop and see if that works just as well.
csaba
Digital Volume Control
Friday, September 04, 2009 12:41:04 PM
4. Using a dual polariity power supply (+-5V works fine).. The maximum voltage between 8.pin and 5.pin is 8V!
Ehet
Digital Volume Control
Tuesday, July 14, 2009 9:48:56 AM
I thought to build an amplifier with an built in home made loudspeaker, so I thought I should use this volume control and the touch switch together with the amplifier:-)
shayo
Digital Volume Control
Friday, June 12, 2009 3:46:17 PM
I bealive you man bing up, I saw many things from your web which is simple and well aplicable .easily for study for the student like us ,so keepit up
BLACK3R
Digital Volume Control
Wednesday, October 15, 2008 4:33:48 PM
it thinks too easy :D
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