[sdiy] sin/cos pot

[Ove Ridé]

On 10 July 2017 at 13:12,  <rsdio at audiobanshee.com> wrote:
> Does anyone know why these pots are cosine and sine instead of two linear ramps that are offset by 90 degrees or 180 degrees?

It doesn't have to be a sinusoidal shape per se. You could also use
two triangular outputs in quadrature. (Triangular in terms of the
sweep waveform.) The unit circle would then become a unit square
rotated 45 degrees so its corners are on the axis lines, but otherwise
it would have the same useful mathematical properties in terms of
indexing. Having two linear ramps proper would be a bad idea, since
you would have a discontinuity at the max/min transition point.

-- 
/Ove

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