[sdiy] random thought about sine shapers

[cheater cheater]

On Mon, Apr 19, 2010 at 10:07, David G. Dixon <dixon at interchange.ubc.ca> wrote:
> I was just looking at the front panel of the Buchla 261e (VCO), and I had a
> thought:  Why not take the sine symmetry and shape trimmers on my VCO out to
> the front panel?  The shape trimmer in particular goes from triangle through
> sine to square.  That would be a pretty useful thing to have under user
> control, or even voltage control (could be a creative use for one of those
> spare 2164 VCAs...).

That's one thing I was going to request once you got to designing the
shaper :-) sin/tri.. if you can get square in too, that's better, if
you can get PW in, that's even better. No, there's no reason you
shouldn't have it on the front panel :-) But make sure there still are
trimmers so that you can actually tune it up.

Another popular one seems to be saw/PW, but I don't know how it works.

> A question:  What does a typical waveform selection knob actually do?  Does
> it simply crossfade from one static waveshape to another, or is it
> performing an actual waveshaping function, like a sine shape trimmer?

do you mean potentiometer or switch?

A switch would probably just tap outputs at different stages of the
shaper, my guess..

D.