<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Yes Roman! That must be it.<div>It’s not what I would think of as a “stereo panpot” with six leads.</div><div>And how would I shop for one)<br id="lineBreakAtBeginningOfSignature"><div dir="ltr">Benjamin Tremblay</div><div dir="ltr"><br><blockquote type="cite">On Jun 21, 2024, at 9:29 AM, Tom Wiltshire <tom@electricdruid.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8">I hope the mounting height matches some other useful hardware!<div class=""><br class=""></div><div class="">Trying to find pots that match the rotary switches, encoders, or buttons you have is very difficult.<br class=""><div class=""><br class="webkit-block-placeholder"></div><div class=""><div class="">Tom</div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On 21 Jun 2024, at 14:11, Martin Klang via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<title class="">RE: [sdiy] Using dual taper (4 pin) pots as encoders ?</title>
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<div class=""><div style="margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: small;" class="">aka Endless potentiometer, with two outputs in phase quadrature. The Alpha RV112FF-40 is the only commercially available example that I know of.</div><p style="margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: small;" class=""> </p><p style="margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: small;" class=""> </p><div style="margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: small;" class="">Martin</div><p style="margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: small;" class=""> </p><blockquote style="border-left: 2px solid rgb(176, 176, 183); margin-left: 5px; margin-right: 0px; padding-left: 5px;" class="">-----Original message-----<br class=""><strong class="">From:</strong> Roman Sowa via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>><br class=""><strong class="">Sent:</strong> Friday, June 21 2024, 2:53 pm<br class=""><strong class="">To:</strong> Benjamin Tremblay <<a href="mailto:btremblay@me.com" class="">btremblay@me.com</a>>; SDIY List <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>><br class=""><strong class="">Subject:</strong> Re: [sdiy] Using dual taper (4 pin) pots as encoders ?<br class=""> <pre style="text-wrap: wrap;" class="">Quadrature potentiometer.
One taper is rotated 180 or 90 degrees versus the other one. This way at
any angle there's at least one wiper on its taper. Basicaly a way to
remove the dead spot, where wiper travels over empty fragment between
taper ends.
Measure 2 voltages, a bit of calculations and you have rotary encoder
with resolution as high as your ADC.
Roman
W dniu 2024-06-21 o 13:34, Benjamin Tremblay via Synth-diy pisze:
> Hi, another MCU question.
> I have noticed many synth manufacturers have used 10K 4-pin dual
> potentiometers as “encoders”. I’m assuming that these are feeding a
> multiplexed ADC.
> My question is, what is the secret sauce? Are both pot tracks wired
> differentially to reduce noise? Does this indeed go into an ADC or is
> this some clever way to approximate a rotary encoder but have the smooth
> motion of a pot?
>
> If using a 4-pin potentiometer is a way of achieving a more stable and
> reliable mass-production of control knobs, I’m very interested.
>
> Thanks,
> Ben
>
>
> Benjamin Tremblay
> <a title="This external link opens in a new window" href="mailto:btremblay@me.com" class="">btremblay@me.com</a>
> Carlisle, MA 01741
>
>
>
>
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>
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>
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