[sdiy] Retractable mini pots

[Ben Stuyts]

I used to have a Teisco 110f when it first came out. Stupid me sold it when the first midi synths came on the market :-(

But anywho, I very much enjoyed the fixed filter bank on it, which was just 8 pots:

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I find it interesting that the frequencies are spaced at half-octaves from 250 - 2800 Hz:

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This was very usable and sounded very musical to me. I wonder where they got this from, it wasn?t from the ARP Odyssey which they licensed I believe.

Ben


> On 9 Sep 2026, at 16:43, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> FFB is useful but consider an EQ too, just to try it out, they go for
> stupid money nowadays, like $50 on the used market, especially
> behringer ones. I bet you'll find they do different things.
> 
> On Wed, Sep 9, 2026 at 4:09?PM Dixon, David <david.dixon at ubc.ca> wrote:
>> 
>> I am putting a 14-band fixed filter bank on the unit, and yes, it does have a pretty big effect.  I will squeeze it in somewhere near the middle of the panel, right above or below the resonators.
>> 
>> Given the bigger spacing of my panel controls relative to the PS-3100, I will probably have to sacrifice some of the jacks on the patch bay.  However, my panel will probably be a bit taller because my ?guts? are a bit taller.
>> 
>> 
>> 
>>> On Sep 9, 2026, at 6:35 AM, cheater cheater <cheater00social at gmail.com> wrote:
>>> 
>>> [CAUTION: Non-UBC Email]
>>> 
>>> Watched the video over the last few days. Disappointed at the lack of
>>> singing, but great toilet watching none the less.
>>> 
>>> If I were you I'd add 1-2U rack space at the top, to integrate an
>>> inexpensive graphic equalizer. They are getting sold for close to
>>> nothing, almost thrown out, and will have great effect on such a
>>> synth. GEQ is one of the most underappreciated effects for polysynths.
>>> 
>>> Also, why not add polyphonic aftertouch?
>>> 
>>> On Fri, Aug 21, 2026 at 8:35?PM Dixon, David via Synth-diy
>>> <synth-diy at synth-diy.org> wrote:
>>>> 
>>>> Hello Synth DIY Team,
>>>> 
>>>> As many of you probably know, I am building my own version of the Korg PS-3100.  (Here?s a fairly cringe video of the core in action, with a lot of extra info about the board layouts, etc ? https://www.youtube.com/watch?v=lbtxMdQE64A) I?ve got the core circuitry (48 separate synthesizers) and much of the downstream circuitry (resonators, etc) designed, built and tested, and I am currently trying to lay out the panel.
>>>> 
>>>> I am going to also have the 12 mini pots down the left side for ?TEMPERAMENT ADJUST? (which I presume was basically a way to adjust the tuning without opening the case and adjusting trimmers).  The original had these nifty retractable mini pots that can be pushed in flush the panel when not being used.  I cannot seem to find anything similar on the internet.  I was wondering if any of you had any inside track into where one might be able to procure such a thing.  I need a dozen of them, and I?d prefer if they were PCB mount, but that?s not strictly necessary.
>>>> 
>>>> Thanks in advance,
>>>> Dave Dixon
>>>> ________________________________________________________
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>> 
> 
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