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

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

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.

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Comments

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Ehma Onwuka Digital Volume Control using ICDS1669 Monday, November 14, 2016 7:39:56 AM

This is quite interesting but unfortunately, the IC 1669 is scarce. Difficult to find in the market. I leave in Nigeria. Please is it possible to find a replacement so I can try this interesting project. Thank you and God bless.

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

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Ehma Onwuka	Digital Volume Control using ICDS1669	Monday, November 14, 2016 7:39:56 AM
This is quite interesting but unfortunately, the IC 1669 is scarce. Difficult to find in the market. I leave in Nigeria. Please is it possible to find a replacement so I can try this interesting project. Thank you and God bless.
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