[sdiy] Pro One CEM3340 Sync magic

[Colin f]

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Simon Brouwer
> Sent: 18 April 2010 13:09
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Pro One CEM3340 Sync magic

> Can somebody explain how this should work? Note that a sync 
> pulse pulls the triangle buffer *output* down.

I don't know what's inside the 3340, but since the external transistor pulls
the buffer output down to -5v, and the voltage on the input to the buffer is
usually in the range 0 to +5v, my guess would be that the buffer ceases to
be a buffer, and the charge on the cap flows straight through it to -5v.

Cheers,
Colin f