[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 MTG
> Sent: 18 April 2010 02:04
> To: Synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Pro One CEM3340 Sync magic

> Low and behold they used 
> a rather clever method of squashing the triangle wave of the 
> 3340 which resets the LFO. This seems to be somewhat 
> undocumented since the part has other pins for sync.

Actually, it's documented as "Conventional Hard Sync", figure 5 in the
Curtis CEM3340 data sheet.
Widely used on any 3340 based synth that wants a decent sync sound.

Cheers,
Colin f