CEM3340 sync results

[Martin Czech]

> Hi,
> 
> last night I have finally made an A / B comparison between
> the CEM3340 + external transistor sync and "normal" sync
> of a saw VCO.

A VERY INTERESTING MESSAGE SNIPPED.

Makes sense.
How would you describe 3340 "external" sync versus "internal mode".
I'd say rough versus unspectacular, or something.
A good idea to have both possibilities.


One aditional question:

The 3340 is an integrator triangle osc. That means that the saw must
be constructed via a polarity switch (this is the "reverse" function of
a rectifier, which is used for saw->tri conversion, funny isn't it?).
The so constructed saw has *almost* double frequency (it is not perfect,
ie. there is still a fundamental frequency component left, because of
polarity switch imperfection). Now the triangle direction switch signal,
alias square is added to the saw, and there you are, a proper 1:1 saw
wave, but it should have a glitch and/or step where the square skips.

Ar shorter: all tri->saw converters should give a saw with a glitch/step.

Is this correct, or are there better methods?
Could you see any such artefacts on the 3340 saw wave?

I think the step could be avoided by proper trimming the square level and
offset, but the glitch ? 

How could it be done in the 3340, there is no trim pin for that.
Low bandwidth buffer ?

m.c.