[sdiy] Tune VCO

[Paul Perry]

One really should have TWO adjustments for a VCO,
One to make the frequency double for each one volt increase (that's the
octave per volt) 
And another to make sure that the borttom C is at zero volts.

If you have only one control, then I don't see how it can be tuned exactly!

But if you DO have two trimmers, then the key is to adjust the oct/v trim so
that moving from the middle C to the next higher C gives exactly one octave.

Then, fiddle with the other one until theCs really ARE C's.

You MIGHT have to repeat the procedure a couple of times.. but it should
converge to perfection. If not, there is a problem somewhere..

Paul Perry Melbourne Australia

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