[sdiy] sync circuit woes

[Ian Fritz]

At 01:17 AM 11/21/2008, Simon Brouwer wrote:

> >Still, is the value of this cap all that
> > critical?  Also, would it be necessary at all if an opamp had been used as
> > a
> > comparator here instead of the LM311?
>
>Yes and yes.
>
>If this capacitor is too small the sawtooth will not be completely reset,
>so that its amplitude is decreased and its frequency will be too high.
>If the capacitor is too big the duration of the reset will be too long so
>that the sawtooth shape is affected and the high notes will be flat.

Exactly. And as a corollary would you agree that it is impossible that a 10 
pF cap would work, but a 22 pF cap would not.  :-)

   Ian