[sdiy] sin/cos pot

[Bruno Afonso]

How do these feel? Like previous generation elektron encoders? Could we
easily mux 6 pots into one ADC? I've never done it. I have a teensy 3.6
based prototype to send out dmx where I currently have 6 encoders. But I'd
love to upgrade this to elektron like encoders/endless pots.. :) this is
exactly why a while ago I asked about it. Others were interested as well.

On Mon, Jul 10, 2017, 13:47 Liam D <helloliamdaly at gmail.com> wrote:

> Thanks! I remember coming across this style of pot a while back when
> tinkering with an alesis ion. That synth used about 30 of these plus a few
> regular pots all muxed down to 8 ADC channels. The service manual is on the
> web if anyones interested in the schematic. I always thought these would be
> cool parts to design with but I could never find a supplier for them.
>
> cheers,
>
> Liam
>
> On Jul 10, 2017, at 9:50 AM, Rick Jansen <rick.jansen at xs4all.nl> wrote:
>
> Very useful! Thanks for this, I had never seen it before.
>
> rick
>
> On 10 Jul 2017, at 13:12, Ullrich Peter <Peter.Ullrich at kapsch.net> wrote:
>
> Hi!
>
> Maybe the Bourns ACE Encoder could fit here: absolute encoder, 128 states
> per revolution, no hard steps
> https://www.bourns.com/pdfs/ace.pdf
>
> about 5pounds
>
> http://uk.farnell.com/bourns/eaw0j-b24-ae0128l/encoder-rotary-128pos-8-bit/dp/9358234
>
> Youtube:
> https://www.youtube.com/watch?v=MrPW8QGmlrM
>
> https://www.youtube.com/watch?v=44-XMo730wI
>
>
> Ciao
> Peter
>
> http://www.ullrich.at.tt       (My homepage)
> http://synpro.heimat.eu/datadial.htm   (Synth addon)
> http://rc100-usb.at.tt/    (Roland sampler tool)
>
>
>
> *Von:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org
> <synth-diy-bounces at synth-diy.org>] *Im Auftrag von *paula at synth.net
> *Gesendet:* Montag, 10. Juli 2017 12:51
> *An:* Julian Schmidt <elfenjunge at gmx.net>
> *Cc:* synth-diy at synth-diy.org
> *Betreff:* Re: [sdiy] sin/cos pot
>
>
> Issues I see with a sin/cos pot;
>
> Use of 2 x ADC channels (more expensive than logic inputs)
>
> Slightly more complex software for reading/processing the sin/cos outputs.
>
> Advantge; you get an absolute position.
>
>
>
> if you want more resolution from a regular grey code rotary encoder. you
> can use double edge triggering.
>
> So instead of just picking the rising edge on one channel, use both edges,
> this will give you 48PPQN with a 24PPQN encoder.
>
> I guess, though not tested, you could go a step further and use edge
> detection on both channels and both edges on both channels giving you
> 96PPQN from a 24PPQN encoder, though I would expect switch bounce to cause
> more of a problem at this resolution.
>
> Downside; no absolute position.
>
>
>
> Paula
>
>
>
>
>
>
>
>
>
>
>
>
> On 2017-07-10 11:31, Julian Schmidt wrote:
>
> I also found them at www.adimpex.it for 1.15€/pcs. but they have a
> minimum order amount of 200€ :-/
> still looking for a better sample source.
> Am 10.07.2017 um 12:09 schrieb Michael Zacherl:
>
> On 9.Jul 2017, at 12:42 , Julian Schmidt <elfenjunge at gmx.net> <elfenjunge at gmx.net> wrote:
>
>
>
> Anybody has an idea what the part number for the continuous alpha pots is?
>
> I just asked the other day for an encoder alternative with higher resolution, they would be great!
>
> Maybe I'd have to ask my distributor in taiwan about them.
>
> Thanks for sharing, didn't know such a pot exists.
>
> How would you tell the direction of the movement?
>
>
>
> BTW, $15 ... hm ... needs quantities I'd guess ...
>
> https://www.aliexpress.com/item/1pcs-ALPHA-RV112FF-40B3N-22F-0B10K-Encoder-360-degree-turn-gain-potentiometer/32751858615.html
>
>
>
> Thanks, Michael.
>
>
>
>
>
>
>
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