[sdiy] Kurzweil PC-2 ribbon controller

[harrybissell]

I bought the Expressionmate as well...

I'm playing with the Doepfer I also bought, first... as it has
pressure and position sensitivity.

My interest is to have one long ribbon, quantized. I have the quantizer
from my Midi-Theremin setup.  I got the idea for a ribbon controller
for it when I let a freind play it for the first time. and he moved his
hand
across the ~top~ of the theremin rather than in the air near the
antenna...

I thought... <<you dumb fvck... that's NOT how you do it its not a
ribbon
controller... HEY wait... it COULD be a ribbon controller...>>

H^) harry

David Brown wrote:
> 
> At 09:57 PM 4/14/2006, David Brown wrote:
> >Now to write a PSIM program for a single or triple ribbon
> >controller.  I think I will wire 100K resistors from the 'wipers' to
> >a voltage higher than across the resistors.  That way I can tell
> >whether the ribbon is in contact (output voltage between the
> >resistor voltage) or not in contact (output voltage higher than the
> >resistor voltage).  I'm thinking that just a diode drop would do.  I
> >can run the ribbon off of +5.7 volts with each section at +5
> >volts.  That way I can do a return to center and know when to output a gate.
> 
> I went the other way.  I added a diode in series with the ground
> connection. This limits the lowest voltage I can generate with the
> ribbon to 0.6 volts.  I rely upon the input impedance of the PSIM
> (100K) to read 0 volts when there is no contact with the ribbon. Works fine.
> 
> I've smoothed the transitions across the three ribbons.  It's not
> quite perfect but I'm not sure if you would notice if you didn't know
> where the transitions are.  It's at least as good as the Expressionmate.
> 
> Who else bought a PC-2?  Did you get your's yet?
> Dave