Digital Potentiometer? - Electronic Circuits Projects Diagrams Free

Q__Hybrid · 15th May 2005, 12:31 AM

Hey, total newb here.

Is there such a thing as a potentiometer that you can set by inputting a binary value? The only potentiometers I can find have to be manually tuned.

It would be nice to control lighting and audio by way of a completely digital pot. These must be under some other name. Anybody?

+Q__

ljcox · 15th May 2005, 02:08 AM

Yes there is. Modern TVs, CD Players, etc use digital potentiometers.

I don't know the IC number, so I suggest you do a search in a IC data sheet web site such as www.alldatasheet.com and search for "attenuator" or "digital attenuator" or "digital potentiometer"

However, someone in this forum may know.

If you find one, please let us know.

Len

audioguru · 15th May 2005, 02:20 AM

www.maxim-ic.com have lots of digital potentiometer IC's. Mono or stereo, linear or audio-taper. Some are non-volatile but I think the memory-burning part lasts only a few thousand saves. Some have a very low-power "sleep" mode where the last setting is held with battery-backup. :lol:
http://www.maxim-ic.com/solutions/au...pk/11/pl_pk/50

**Jay.slovak** · 15th May 2005, 10:05 AM

I have good experiences with Microchips MCP41010 - single channel, 10K resistance, 255stages, controlled by SPI..
OR MCP42010 is dual channel

Also Maxims IC's are good too, they offer also I2C versions

Pyroandrew · 20th May 2005, 06:20 PM

The AD5520 is a very simple and easy to use digital pot. It is made by Analog Devices.

It does not employ a high level control propocal, just an up/down pin and a clock pin. I think this will be the best for a newbee.

The MAX5471 also uses this simple interface. I would not sugest for abeginner to use a digital pot that uses SPI or I2C.

**bryan1** · 21st May 2005, 12:26 AM

If your looking for a digital pot for 1 wire then the Dallas 2890 is a good choice. I got a couple of samples from and when time allows I'll put them to good use.

Note: 1 application Dallas provides for the above chip is digitally controlled fluro lighting

Hope this helps

Cheers Bryan

kt · 23rd May 2005, 09:34 PM

Try the Dallas DS1669-10 pot (10 KOhms).You can change its value
by two buttons(Up-Down).It has also memory to keep last value
before the power off.

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15th May 2005, 12:31 AM	#1
Q__Hybrid	Digital Potentiometer? Hey, total newb here. Is there such a thing as a potentiometer that you can set by inputting a binary value? The only potentiometers I can find have to be manually tuned. It would be nice to control lighting and audio by way of a completely digital pot. These must be under some other name. Anybody? +Q__

15th May 2005, 02:08 AM	#2
ljcox	Yes there is. Modern TVs, CD Players, etc use digital potentiometers. I don't know the IC number, so I suggest you do a search in a IC data sheet web site such as www.alldatasheet.com and search for "attenuator" or "digital attenuator" or "digital potentiometer" However, someone in this forum may know. If you find one, please let us know. Len

15th May 2005, 02:20 AM	#3
audioguru	www.maxim-ic.com have lots of digital potentiometer IC's. Mono or stereo, linear or audio-taper. Some are non-volatile but I think the memory-burning part lasts only a few thousand saves. Some have a very low-power "sleep" mode where the last setting is held with battery-backup. :lol: http://www.maxim-ic.com/solutions/au...pk/11/pl_pk/50 __________________ Uncle $crooge

15th May 2005, 10:05 AM	#4
Jay.slovak	I have good experiences with Microchips MCP41010 - single channel, 10K resistance, 255stages, controlled by SPI.. OR MCP42010 is dual channel Also Maxims IC's are good too, they offer also I2C versions __________________ "I share, thus I am" Jay.slovak Read this! ICD2 Clone Best PIC/DsPIC Bootloader Read my Inchworm ICD2 review!

20th May 2005, 06:20 PM	#5
Pyroandrew	The AD5520 is a very simple and easy to use digital pot. It is made by Analog Devices. It does not employ a high level control propocal, just an up/down pin and a clock pin. I think this will be the best for a newbee. The MAX5471 also uses this simple interface. I would not sugest for abeginner to use a digital pot that uses SPI or I2C.

21st May 2005, 12:26 AM	#6
bryan1	If your looking for a digital pot for 1 wire then the Dallas 2890 is a good choice. I got a couple of samples from and when time allows I'll put them to good use. Note: 1 application Dallas provides for the above chip is digitally controlled fluro lighting Hope this helps Cheers Bryan __________________ " The only way to avoid human error is to avoid the use of humans"

23rd May 2005, 09:34 PM	#7
kt	Try the Dallas DS1669-10 pot (10 KOhms).You can change its value by two buttons(Up-Down).It has also memory to keep last value before the power off.