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Old 21st November 2008, 11:11 AM   #1
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Default 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
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Old 21st November 2008, 01:30 PM   #2
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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
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Old 21st November 2008, 02:52 PM   #3
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Thank you audioDIYer,

I will study that datasheet.

But still there is no convenient readout.

More ideas to take a closer look at?

Peter
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Old 21st November 2008, 11:14 PM   #4
jaycee is offline jaycee  United Kingdom
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Using a microcontroller is the simplest way, but of course you need to be able to write code.
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Old 22nd November 2008, 07:50 AM   #5
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And that is my problem, I am afraid!
I am an “analog guy”.

Peter
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Old 22nd November 2008, 12:02 PM   #6
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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?
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Old 23rd November 2008, 01:20 PM   #7
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Does anybody know an existing design, or do I have to invent the wheel again?

Peter
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Old 23rd November 2008, 01:33 PM   #8
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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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Old 23rd November 2008, 02:45 PM   #9
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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
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