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

[cheater cheater]

That's pretty cool - thanks guys!

D.

On Sat, Apr 3, 2010 at 17:47, Tom Ivar Helbekkmo <tih at hamartun.priv.no> wrote:
> 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
>