Digital potentiometer with readout

Peter Roodzant · 21st November 2008, 11:11 AM

I am looking for a digital potentiometer design for volume control.
This design is an example of the kind of circuit I am looking for (page 5 and 6):
http://www.edn.com/contents/images/30603di.pdf
What I like about it is it’s simplicity. But the problem is that it lacks any kind of readout. So you have no indication at all in which position the “wiper” is after turning the rotary encoder.
Did a lot of searching, but didn’t find a design which displays the wiper setting.
Any ideas?

Peter

audioDIYer · 21st November 2008, 01:30 PM

You can always use a counter...

Volume control for audio with this AD5220?
Why not MAX5440? http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4065/t/al

Peter Roodzant · 21st November 2008, 02:52 PM

Thank you audioDIYer,

I will study that datasheet.

But still there is no convenient readout.

More ideas to take a closer look at?

Peter

jaycee · 21st November 2008, 11:14 PM

Using a microcontroller is the simplest way, but of course you need to be able to write code.

Peter Roodzant · 22nd November 2008, 07:50 AM

And that is my problem, I am afraid!
I am an “analog guy”.

Peter

jackinnj · 22nd November 2008, 12:02 PM

Quote:

Originally posted by jaycee
Using a microcontroller is the simplest way, but of course you need to be able to write code.

MAX5486 with up/down buttons has LED driver. The 5440 mentioned above uses a rotary encoder. They are surface mount, however.

you can do this with a DS1802 (Dallas Semi is part of Maxim) -- using buttons. The buttons can also be wired to a counter which drives a LED Display Driver. Search DS1802

Didn't Elektor offer a kit?

Peter Roodzant · 23rd November 2008, 01:20 PM

Does anybody know an existing design, or do I have to invent the wheel again?

Peter

audioDIYer · 23rd November 2008, 01:33 PM

I think all you need has been said here.

Just use some TTL or CMOS chips to read clock and U/D for displaying on leds.

No need to invent, just do some research (or search)...

theAnonymous1 · 23rd November 2008, 02:45 PM

If your looking for a complete kit, this is the only one I am aware of that has the option for a LCD module.

http://www.tauntek.com/irvc2-ir-mast...me-control.htm

21st November 2008, 11:11 AM	#1
Peter Roodzant diyAudio Member Join Date: Nov 2008	Digital potentiometer with readout I am looking for a digital potentiometer design for volume control. This design is an example of the kind of circuit I am looking for (page 5 and 6): http://www.edn.com/contents/images/30603di.pdf What I like about it is it’s simplicity. But the problem is that it lacks any kind of readout. So you have no indication at all in which position the “wiper” is after turning the rotary encoder. Did a lot of searching, but didn’t find a design which displays the wiper setting. Any ideas? Peter

23rd November 2008, 02:45 PM	#9
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	If your looking for a complete kit, this is the only one I am aware of that has the option for a LCD module. http://www.tauntek.com/irvc2-ir-mast...me-control.htm __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

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21st November 2008, 01:30 PM	#2
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	You can always use a counter... Volume control for audio with this AD5220? Why not MAX5440? http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4065/t/al

21st November 2008, 02:52 PM	#3
Peter Roodzant diyAudio Member Join Date: Nov 2008	Thank you audioDIYer, I will study that datasheet. But still there is no convenient readout. More ideas to take a closer look at? Peter

21st November 2008, 11:14 PM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Using a microcontroller is the simplest way, but of course you need to be able to write code.

22nd November 2008, 07:50 AM	#5
Peter Roodzant diyAudio Member Join Date: Nov 2008	And that is my problem, I am afraid! I am an “analog guy”. Peter

23rd November 2008, 01:20 PM	#7
Peter Roodzant diyAudio Member Join Date: Nov 2008	Does anybody know an existing design, or do I have to invent the wheel again? Peter

23rd November 2008, 01:33 PM	#8
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	I think all you need has been said here. Just use some TTL or CMOS chips to read clock and U/D for displaying on leds. No need to invent, just do some research (or search)...

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