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

[Tom Ivar Helbekkmo]

cheater cheater <cheater00 at gmail.com> writes:

> Another way would be to make your own multi-gang potentiometers. I
> guess in a typical potentiometer the shaft could go through a hole in
> the resistive element and out the back. I guess you could make such
> potentiometers without a shaft, but with a keyed hole for receiving
> the shaft; then you could take one long shaft and just line up as many
> potentiometers on it as you wanted. Sound like a good idea? I wonder
> if any currently existing potentiometers could be modified for that.

I have seen pots like this, made for mounting vertically on a PCB, and
with an X-shaped hole in the middle for turning the slider (with a
plastic screwdriver).  I've always assumed that this is what's inside a
normal pot for control panel mounting.  A number of these behind each
other on a PCB, with a stiff, non-conductive rod running through them,
might do the trick.  I'd be worried about the pot at the near end to the
knob turning more than the far one, though.  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.

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