[sdiy] 3340 FET sync

[Mattias Rickardsson]

That could be it, Tony. The oscillator in the example pics is still
charging in the wrong direction when the sync pulse comes in.

Jürgen Haible's recently mentioned Dual VCO comes to mind... what's he
doing there with that pin 9 of the lower 3340? Sniffing the soft sync input
pin in order to check the state of the internal tri-core comparator?
http://jhaible.com/legacy/tonline_stuff/hj2vco.gif

/mr

On Tue, 21 Jan 2020 at 09:59, Oakley Sound via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I'm probably completely on the wrong track; but the 3340 is a triangle
> core oscillator - there's a triangle waveform on that capacitor. If you
> short it at certain points on the waveform maybe something weird happens
> like an overshoot. Normally when you do sync on a triangle core
> oscillator you have to force the comparator too.
>
> So take a look on the triangle output and see what's actually doing
> before the waveform goes to the tri to saw convertor.
>
> Tony
>
> www.oakleysound.com
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