percussion ribbon controller

harrybissell at harrybissell at
Mon Nov 15 16:48:41 CET 1999

You can deal with low resistance by using a bridge connection and a differential (instrumentation) amplifier. Strain Gauge and RTD people do this all the time... but it is a lot of circuit....

:^) Harry 

 ---- On Nov 14 Mvsik at wrote: 
> In a message dated 11/14/99 3:16:19 PM EST, MAILER-DAEMON at writes:
> << In a message dated 11/13/99 1:39:20 PM EST, harrybissell at 
> writes:
>  << BUT if you asked for "resistance wire" look for NiChrome 
> (Nickel-Chromium) 
>  used in
>   electric heating apps. It has the ohms per foot type response you are 
>  looking for.
>   :^) Harry  (who will try this on monday... great idea !!!)
>    >>
>  Correction: I had thought an electric guitar string had virtually no 
> resistance, but I just measured the thinnest unwound guitar wire I have, high 
> "E", and it has 3 ohms 
>  end-to-end. Still, I suspect it may be difficult to work with wire having a 
> resistance that low. I guess the ideal would be 3-5K for the resistive part 
> if your going to use this "ribbon" in place of the keyboard+resistor chain on 
> a classic analog monosynth. With a lot more (50K+ or so) resistance I get 
> glide between pitches as an unwanted  side effect. Thats what happened when I 
> tried to use videotape.  But, use too little resistance and it becomes 
> impossible to scale anything.

More information about the Synth-diy mailing list