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

[synth at schmitzbits.de]

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

I think what he refers to is that a PLLs often has a frequency divider that is digitally controlled.

Cheers,
 René

________________________________
Von: Synth-diy <synth-diy-bounces at synth-diy.org> im Auftrag von Donald Tillman <don at till.com>
Gesendet: Mittwoch, 3. Dezember 2025 02:32
An: cheater cheater <cheater00social at gmail.com>
Cc: rburnett at richieburnett.co.uk <rburnett at richieburnett.co.uk>; synth-diy <synth-diy at synth-diy.org>
Betreff: Re: [sdiy] DC-1 MHz, through-zero FM, controlled, oscillator without core capacitor

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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