Re: Remote Control of an Old Synth

On a sunny day (Wed, 16 Sep 2009 04:07:55 -0700 (PDT)) it happened Barry
<magnus.moraberg@xxxxxxxxx> wrote in
<82bb59e9-80d2-4ab5-a1d0-e1f8bec8c0e8@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

I like this idea the most, but I'm guessing thats because I'm ignorant
to the problems involved. Has anyone a picture of a servo controlling
a pot? I've searched and searched but find it very hard to find what
I'm looking for. I'd really be interested in any articles you can
direct me to on this subject. I actually taught that there would be
more examples on the net of people trying to control old devies from a
computer. What servos are you using Jan? Again, are there "silent"
servos?

I am using standard Carson type RC servos:
ftp://panteltje.com/pub/spare_servo_img_1559.jpg
Those come in many sizes and forces,

There are a zillion ways you can couple a servo to a pot, here some simple ones that come to mind:
ftp://panteltje.com/pub/servo_to_pot_img_1562.jpg
In the left, this servo, a 180 degrees range one, is connected with a belt to the pot,
the diameter ratio of of the disks is 270 / 180 to get 270 degrees on the pot.
In configuration 2 the servos are opposite the post, and need to be able to do 270 degrees.

It all depends on how good you are mechanical, and in electronics.
Modifying the electronics creates a solution that is less noisy.
But can be very difficult as there exists dual gang pots, and log pots, and pots of all sorts with taps,
and all sort of voltages may be present, and all sort of exotic resistance values maybe be used.

The idea of using LDR (light dependent resistors) with a light bulb controlled by a DA converter from the PC
could work in *some* cases... gives good isolation, bad reproducibility,
Re-designing that original electronics with the pots in it, is likely not for the faint of heart

There are very cool PC software solutions for musicians these days, maybe you can do everything on the PC.
.

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