[sdiy] Boss PC-2 CT pot replacement

[Adam Inglis]

On 10/09/2011, at 12:23 PM, Paul Perry wrote:

> 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.

So, in the PC-2, instead of ground they're using a reference from a  
buffered voltage divider?


Sounds like a good system -are CT pots hard to get now?


cheers
Adam




> 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
>
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