[sdiy] DC-1 MHz, through-zero FM, controlled, oscillator without core capacitor

[Donald Tillman]

On Dec 1, 2025, at 8:21 AM, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> A PLL would mean completely digital control, wouldn't it?

PLLs are analog.  I'm not sure what you mean by "digital control".


> Do PLLs like that respond well to audio rate modulation?

PLLs are often used for FM radio demodulation, so yeah.


> Low bass on a Theremin sounds pretty good.
> https://www.youtube.com/watch?v=CgPgasgoVbU

That's an even goofier video!

Theremins can have a problem with very low notes because the two oscillators can sync up as their frequencies get really close.

So yeah a flip-flop on the output is reasonable feature.

  -- Don
--
Donald Tillman, Palo Alto, California
https://till.com

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