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I notice the Alpha part only has 15000 cycles. Okay for an equaliser control but if people start madly spinning these round like they do the digital ones you'll soon get there.</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 21 June 2024 15:58<br>
<b>To:</b> Tom Wiltshire <tom@electricdruid.net><br>
<b>Cc:</b> Martin Klang via Synth-diy <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Using dual taper (4 pin) pots as encoders ?</span>
<div> </div>
</div>
<div style="direction: ltr;">Yes Roman! That must be it.</div>
<div style="direction: ltr;">It’s not what I would think of as a “stereo panpot” with six leads.</div>
<div style="direction: ltr;">And how would I shop for one)</div>
<div style="direction: ltr;">Benjamin Tremblay</div>
<div style="direction: ltr;"><br>
</div>
<blockquote>
<div style="direction: ltr;">On Jun 21, 2024, at 9:29 AM, Tom Wiltshire <tom@electricdruid.net> wrote:<br>
<br>
</div>
</blockquote>
<blockquote>
<div style="direction: ltr;">I hope the mounting height matches some other useful hardware!</div>
<div style="direction: ltr;"><br>
</div>
<div style="direction: ltr;">Trying to find pots that match the rotary switches, encoders, or buttons you have is very difficult.</div>
<div style="direction: ltr;"><br>
</div>
<div style="direction: ltr;">Tom</div>
<div style="direction: ltr;"><br>
</div>
<blockquote>
<div style="direction: ltr;">On 21 Jun 2024, at 14:11, Martin Klang via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" id="OWA222dad39-67e8-b428-45ed-050c9a788070" class="OWAAutoLink">synth-diy@synth-diy.org</a>> wrote:</div>
<div style="direction: ltr;"><br>
</div>
<div style="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
aka Endless potentiometer, with two outputs in phase quadrature. The Alpha RV112FF-40 is the only commercially available example that I know of.</div>
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<div style="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
Martin</div>
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<div style="direction: ltr;">-----Original message-----<br>
<b>From:</b> Roman Sowa via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" id="OWA6ed49cba-8a90-1e1d-796f-ff648ea35e6b" class="OWAAutoLink">synth-diy@synth-diy.org</a>><br>
<b>Sent:</b> Friday, June 21 2024, 2:53 pm<br>
<b>To:</b> Benjamin Tremblay <<a href="mailto:btremblay@me.com" id="OWA6e992dd6-abbf-fea4-d666-c27000fe6a8c" class="OWAAutoLink">btremblay@me.com</a>>; SDIY List <<a href="mailto:synth-diy@synth-diy.org" id="OWAa97348d6-624c-a384-0360-382a96878ec7" class="OWAAutoLink">synth-diy@synth-diy.org</a>><br>
<b>Subject:</b> Re: [sdiy] Using dual taper (4 pin) pots as encoders ?<br>
</div>
<pre><div style="direction: ltr;">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 href="mailto:btremblay@me.com" id="OWAd671ab4c-eaa9-d8b0-2931-bd6c7b9cdf0b" class="OWAAutoLink" title="This external link opens in a new window">btremblay@me.com</a>
> Carlisle, MA 01741
>
>
>
>
>
>
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Benjamin Tremblay via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 21 June 2024 15:58<br>
<b>To:</b> Tom Wiltshire <tom@electricdruid.net><br>
<b>Cc:</b> Martin Klang via Synth-diy <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Using dual taper (4 pin) pots as encoders ?</span>
<div> </div>
</div>
<div style="direction: ltr;">Yes Roman! That must be it.</div>
<div style="direction: ltr;">It’s not what I would think of as a “stereo panpot” with six leads.</div>
<div style="direction: ltr;">And how would I shop for one)</div>
<div style="direction: ltr;">Benjamin Tremblay</div>
<div style="direction: ltr;"><br>
</div>
<blockquote>
<div style="direction: ltr;">On Jun 21, 2024, at 9:29 AM, Tom Wiltshire <tom@electricdruid.net> wrote:<br>
<br>
</div>
</blockquote>
<blockquote>
<div style="direction: ltr;">I hope the mounting height matches some other useful hardware!</div>
<div style="direction: ltr;"><br>
</div>
<div style="direction: ltr;">Trying to find pots that match the rotary switches, encoders, or buttons you have is very difficult.</div>
<div style="direction: ltr;"><br>
</div>
<div style="direction: ltr;">Tom</div>
<div style="direction: ltr;"><br>
</div>
<blockquote>
<div style="direction: ltr;">On 21 Jun 2024, at 14:11, Martin Klang via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" id="OWAedb7cf66-c4d0-5889-7864-741f0283d8e1" class="OWAAutoLink">synth-diy@synth-diy.org</a>> wrote:</div>
<div style="direction: ltr;"><br>
</div>
<div style="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
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="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
</p>
<p style="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
</p>
<div style="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
Martin</div>
<p style="direction: ltr; margin: 0px; font-family: Arial, Tahoma, Helvetica, sans-serif; font-size: 9.75pt;">
</p>
<blockquote style="margin-right: 0px; margin-left: 5px; padding-left: 5px; border-left: 2px solid rgb(176, 176, 183);">
<div style="direction: ltr;">-----Original message-----<br>
<b>From:</b> Roman Sowa via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" id="OWAa883a581-7a2c-c14a-0fda-be8af8797f3b" class="OWAAutoLink">synth-diy@synth-diy.org</a>><br>
<b>Sent:</b> Friday, June 21 2024, 2:53 pm<br>
<b>To:</b> Benjamin Tremblay <<a href="mailto:btremblay@me.com" id="OWA6763e32b-a580-48a6-150c-c5147f6f5d49" class="OWAAutoLink">btremblay@me.com</a>>; SDIY List <<a href="mailto:synth-diy@synth-diy.org" id="OWA78cc57ba-87e8-8e25-447a-8e7a0db51ff5" class="OWAAutoLink">synth-diy@synth-diy.org</a>><br>
<b>Subject:</b> Re: [sdiy] Using dual taper (4 pin) pots as encoders ?<br>
</div>
<pre><div style="direction: ltr;">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 href="mailto:btremblay@me.com" id="OWA412a5fee-4c15-538f-c350-55130bceb81a" class="OWAAutoLink" title="This external link opens in a new window">btremblay@me.com</a>
> Carlisle, MA 01741
>
>
>
>
>
>
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: <a href="mailto:Synth-diy@synth-diy.org" id="OWA0d3dde52-1078-32c3-9aa7-c00c155df6b9" class="OWAAutoLink" title="This external link opens in a new window">Synth-diy@synth-diy.org</a>
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