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Peter Roodzant 21st November 2008 11:11 AM

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):
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?


audioDIYer 21st November 2008 01:30 PM

You can always use a counter...

Volume control for audio with this AD5220?
Why not MAX5440?

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?


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”.


jackinnj 22nd November 2008 12:02 PM


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?


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.

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