AW: electronics for a diy ribbon controller

[Haible Juergen]

	>Ok, my daft sugesstion, Assuming you only want an Strig when
you 
	>initially touch the ribbon, why not take the signal from the
rod to the 
	>input of an opamp with a grounding resistor (1M'ish) and have
the opamp 
	>configured as a schmitt trigger, so that when the rod touches
the bottom 
	>of the tape (say .5v) it gives a gate out, and then use this to
drive a 
	>FET (short-to-ground or STrig)? 

You could even implement a little RC - highpass in front of your 
schmitt trigger, so you'd get multiple trigger for discrete steps
(tapping around the ribbon), but single trigger for glides.

JH.