bad precision pot?

[harry bissell]

IMHO (there have been too many of my "o"s as of late) the ywo pot approach is unworkable... In practice you always have the "fine" pot at one end
of the range already when you need just a little more... and centering the fine pot, adjusting the coarse again, and then adjusting the fine
sounds DORKY especially if you are doing it in real time. I have an Aries VCO with this setup and have no problem nailing the pitch with just the
coarse...
There are circuits to show beat frequency on a series of LEDs (usually three LED one too high, one too low, and one that flashes at the beat
frequency when you are real close.. If you cant hear the beats build one of these puppies and land by IFR (instrument flight rules)... :^) Harry
I'll look for this ckt if anyone wants it....

jorgen.bergfors at idg.se wrote:

> >Guess what... I wanted to use a 10 turn for fine and a 12 position rotary
> >switch for coarse. Two pots a la formant may be a bit hard to adjust.
> >Better would be 12 turn , of course, then it would be possible to read
> >halftones directly...  If one rotary position is one octave, I could
> >get 1/100 octave, isn't that 12 cent? Should be good enough, considering
> >all the other drift and errors.
>
> >12 positions seems to be the maximum available, does anybody know a
> >source for rotary switches with more (please not those very expensive
> >rotary switch kits).
>
> I have designed a CV quantizer that gives 16 steps. It is controlled by an ordinary pot or even a CV.
> It gives octaves and fifths in an 8 octave range. This way the fine tune pot only has to cover a fifth, so there is less need for a multiturn.
> Here are the schematics:
> http://www.idg.se/personal/bergfors/bergfotron/Oct%20quantizer.gif
>
> /Jorgen