[sdiy] Boss PC-2 CT pot replacement

[Paul Perry]

This may not be relevant to the original poster, but could be useful in a 
space-strapped modular design:
The usual reason for a centre tapped pot is to ground the middle pin, and 
feed two unrelated signals to the other ends, so you have the option of 
picking off a variable amount of signal 1 or 2.
Now, in many applications you can replace the centre tapped pot by a switch 
and a normal pot - but that makes two holes on the panel.
My idea is this: take a dual ganged pot.
Run a constant voltage to one of the pots, and use this to generate a CV 
indicating pot position.
Now use that CV to toggle a comparator - and use the comparator to control 
switches to select the signal to the other pot, or indeed rearrange any 
ammount of circuitry (eg filter configuration).
Yes, a certain amount of circuitry involved, but perhaps useful sometime.

paul perry melbourne australia