[sdiy] Multi-voice architecture without CV parameters: mechanical replication of settings?

[Tom Ivar Helbekkmo]

cheater cheater <cheater00 at gmail.com> writes:

> Hmm yeah, but I think a good rigid material such as aluminium or steel
> could work (why should they really have to be non-conductive btw?)

Actually, they probably don't.  I was thinking that the bit at the
center that you grab with the screwdriver might be electrically
connected to the slider, but it's more reasonable for it not to be.

>> Possibly better to use a
>> slider, mounted perpendicular to the rod axis, pushing and pulling on a
>> harness that twists the rod from both ends -- and possibly the midpoint
>> as well.  Not too complicated to build, mechanically, I'd think.
>
> I'm having a problem visualizing this

Think of those pots, all in a row, with a rod going through them.  Then
imagine something like a pitch fork, stabbing through the rod at each
end, and possibly in the middle, so that the pitch fork can twist the
rod by applying force at multiple points.  Finally, add a sliding
control with a hinged arm that pushes and pulls on the pitch fork.

Anyway, with non-conductive centers in the pots, you can, as you say,
use a metal rod to turn them, and not worry about the rod twisting.

> Do you know the model of the potentiometers you've seen?

A quick search of my local electronics outlet catalog reveals trim pots
that would work.  Manufacturer Piher, model PT-15MH is an example -- it
has a hexagonal hole through the center, which is non-conductive.  See
<http://www.piher-nacesa.com/pdf/14-PT15v03.pdf> for details.

-tih
-- 
Self documenting code isn't. User application constraints don't. --Ed Prochak