Ribbon controllers (Was: Re: [sdiy] DIY slide-bars)

[Steve Ridley]

> Any other info people?

Buchla did a capacitive sensing slide controller in the
217 Touch controlled voltage source.  I never got
around to building one to see how smooth the response
was.  Schematics are out there...

Two more "traditional" resistove options.  I stripped the
conductive plastic layer out of a length of Musicflex
cable and stuck a plastic knitting needle through it 
for strength.  I was still thinking about how to make 
decent end connections when I was distracted by -

the wire out of an old Spectrol ten turn pot.  These have
a resistance wire element wrapped around the inside in
a spiral, and when unwound you get approx 60cm of
resistance wire.  End to end resistance is obviously the
same as the pot, so available in a variety of values.

Anyone tried an ultrasonic approach?  I know this is
drifting into theremin territory, but there was something in 
a UK electronics mag a few years ago that used a pair of
ultrasonic transducers to measure distance and output
a frequency for musical purposes.  Just a pair of transducers
and a PIC microcontroller... 



Steve  


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