[sdiy] Pro One CEM3340 Sync magic

[ASSI]

On Sunday 18 April 2010, Simon Brouwer wrote:
> Can somebody explain how this should work? Note that a sync pulse
> pulls the triangle buffer *output* down. After the pulse,
> the voltage on the integrator capacitor will not be reset but will
> be roughly the same value as before it (if the free running period
> is large compared to the sync pulse).

How can you make such a statement without knowing how that buffer is 
realized?  

In fact that thing shown as "BUF" in the datasheet is an emitter 
follower followed by a Darlington emitter follower, so if you pull the 
output down with a low enough impedance, the bases will all have to go 
down as well, with three diode drops inbetween.


Achim.
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