[sdiy] How to start tuning a VCO driven by a keyboard's CV...correction again..

[blacet at blacet.com]

--Just trim the VCO so that a 1.00V increase in voltage gives you twice
the frequency. ie, just as you mention C1 to C2, etc.

I would expect to see C2 or C3 based on your description. Most folks would
span the cal over several octaves, but this is a  start.

> I'm out of my mind today.. it's friday.. sorry
> PLEASE REPLY ONLY TO THIS EMAIL.....
>
> Hi,
> Suppose we have a 61 keys synth keyboard that
> produces 3.00-8.00vdc control voltages output (6 octaves span)
> for modular oscillators. I'm designing a
> Moog 921B clone oscillator with all the same
> front panel controls including FREQUENCY +/-12 semitones
> and RANGE selector LO,32',16',8',4',2'   and inputs/outputs.
> -> I have an 1V/oct CV connector in the module
> plugged to the keyboard CV's output.
> Here is my question:
> If I put the VCO's RANGE selector at 8' position,
> put the FREQUENCY pot at mid position (0 semitones)
> and press the very first left C key of the keyboard (3.00vdc)
> what frequency should I expect from the VCO as
> a start for tweaking it's inner trimmers ?
> The standard musical freq table states:
>
> C0 = 16.35hz
> C1 = 32.70hz
> C2 = 65.41hz
> C3 = 130.81hz
> C4 = 261.63hz
> C5 = 523.25hz
> C6 = 1046.50hz
> C7 = 2093.00hz
> C8 = 4186.01hz
>
> Your support very appreciated !
> Many thanks!
> JP
>
>
>
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