[sdiy] spiral waves (sort of)

[harrybissell]

Hmmm... you want one of Don Tillman's Trapezoid VCOs...   :^P

That could give you all the standard waves in quadrature

(maybe I should build one soon...)

H^) harry

john mahoney wrote:

> Richard Wentk wrote:
> > At the risk of restarting The Pointless Thread That Wouldn't Die...
> [snip]
> > That aside it's not very hard to draw a spiral on a scope. Take two sines
> > in quadrature, multiple both by a descending unipolar saw LFO running at
> > some multiple of the sine period, apply to X and Y and there you are.
> >
> > This is more use for designing laser shows - where it looks pretty,
> > especially when made to pulse to the beat of the music - than to synth
> DIY.
> > But it's a standard technique, and not something esoteric. Or chaotic. :)
>
> Mythical waveforms aside, let's look at the feasible idea here: a pair of
> sines in quadrature. Not exactly a common feature on synths, at least not on
> analog synths. Should it be? I mean, are there especially cool things can
> you do with this? Maybe some interesting panning effects, or... well, I
> don't know, that's why I'm asking. :-)
> --
> john