[sdiy] VCO - Saw and Ramp Outputs

[Tim Parkhurst]

On Mon, Jun 1, 2009 at 5:51 AM, Jerry Gray-Eskue <jerryge at cableone.net> wrote:
>
> Hello All,
>
> Should the Saw and Ramp waveforms forms from a VCO used as the Audio Signal
> source be centered on Ground (i.e. -5v to +5v) or is it just as well that
> they run in the 0v to + 10v range?
>
> What about a Low Frequency VCO used as a CV source, is it the same setup?
>
> Jerry
>

Well, here's my take: For audio use, the waveforms should generally be
centered around 0V, as a DC offset can cause problems when mixing or
switching audio. For CV use, it just depends on what effect you want.
Vibrato generally needs a wave centered around 0, while a trill needs
a 0 to +5 wave. On most CV inputs, you'll have an "Initial" setting
pot (hooked up to -V and +V) which can be used as offset to get the
modulation centered where you want, and a "Mod Level" pot (hooked up
as an attenuator) that will control the level. On many CV inputs (like
my Mankato or Sheboygan CV inputs), the Initial pot will have more
range than the core circuit can respond to, but the extra range is
handy for offsetting CVs.


Tim (handy for other stuff) Servo
-- 
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