[sdiy] Coarse and Fine Pots

[Michael E Caloroso]

Just sum the CVs from both pots to the CV summer opamp, configure the fine
tune pot to lower gain.

MC

On Sat, May 24, 2025 at 3:59 PM Terry Bowman via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I'm upgrading my existing Oscilloscope Artist:
>
> https://www.astarcloseup.com/2016/02/the-oscilloscope-artist.html
>
> I really need to add a fine tuning pot to two of the oscillators. I love
> the planetary mechanisms used for the VCO tuning on the Oberheim SEM but
> unfortunately they appear to be unobtainium right now. Are there any dual
> concentric pots with different resistances? It seems to me that a ratio of
> about 5:1 would be close to ideal so that would be 100kΩ/20kΩ.
>
> If not, can I just put a resistor in parallel with the fine pot? I know
> that the latter changes the curve and linear is preferable.
>
> A related question: how does the sync to oscillator C work?
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> https://www.astarcloseup.com
>
> #1: There is no substitute for good tools;
>
> #2: Always use the right tool for the job.
>
> Linn Westcott
>
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