[sdiy] VCO - sine output - why bother?

[mskala at ansuz.sooke.bc.ca]

On Sat, 27 Aug 2016, Donald Tillman wrote:
> The Aries VCO, designed by Dennis Colin (who was responsible for much of
> the early ARP synths), did something very similar.  It had an
> exponential converter with twin outputs, one for a triangle wave core,
> and one for a separate sawtooth wave.  And the peak of the triangle wave
> reset the sawtooth wave.

Interesting.  If using a sine core (oscillating two-pole VCF) in
particular, you need two outputs from the exponential converter for that
anyway, even if in practice people often just drive a couple of resistors
with a single current source and call that good enough.  Having two it
then seems quite natural to have a third output for some other core.

-- 
Matthew Skala
mskala at ansuz.sooke.bc.ca                 People before principles.
http://ansuz.sooke.bc.ca/