Tri 2 Sin

[Martin Czech]

> Me, too, but I'm kind of wondering why folks needing a pure sine vc
> oscillator wouldn't just use a temp. compensated self oscillating
> filter.
> Obviously there would be no easy provision for oscillator sync, but if
> you were using sync, you wouldn't be too concerned about the sine purity
> anyway...
> 
Hmm, I think it is not so easy to have a good frequency tracking (like a
vco) with a filter. Much more frequency determining elements in there
that can all contribute to scale error. I want  avco with reasonable good sine
wave, but also of course good scale conformity.

> If you needed other frequency and phase matched waveforms, what about
> building a vco around a self-oscillating filter core, derive a square
> wave from the sine and generate a saw wave by using the leading edge of
> the square to reset a cap being charged by another expo current derived
> from the pitch cv.
> 
Sounds complicated, a sine shaper seems easier to me.

m.c.