bad precision pot?

[jorgen.bergfors at idg.se]

>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