[sdiy] sync circuit woes

[Ian Fritz]

At 09:55 AM 11/20/2008, David G. Dixon wrote:
>Dan,
>
>I didn't see any 18 pF caps in the schematic.  However, the only timing cap
>there is the 2200 pF in the sawtooth oscillator.  This cap sets the pitch of
>the VCO.  All the other caps in the opamp feedback loops (the 22 pF and the
>100 pF) are there to prevent spurious oscillations in those circuits.

Then why is the 22p in a positive feedback loop?  (It's there to hold the 
discharge pulse on long enough to totally drain the cap.)