[sdiy] Touch switch and theremin chips

[danial stocks]

> >
> > I saw these chips and was wondering if anyone had tried them.
> > QProx (tm) Charge-Transfer Capacitance Sensors
> > Quantum Research Group Ltd
> > http://qprox.com/
>

MAN THESE THINGS ARE HOT!! [Yup this is the most exciting new semiconductor 
product Ive seen since single chip accelerometers!]

> > Touch switches:
> > QT60320 - 32 key matrix
> > QT110 family - single channel
> > Would this be useful to repair dead switches on synths?
you'd be pushing it... you could possibly do it, but at $10+ per key 
wouldn't it be cheaper to file the corrosion off the contacts?
note that they haven't made any mention of how the thing performs [haven't 
read the full data sheet yet] agaonst large metal surfaces [such as the bit 
underneath most keyboards.]..
>
>I see their sample matrix has a '15-segment interpolated fingertip slider
>control (replaces a volume control)'.
>
>I wonder how many segments they can manage max ?

that chip seems only to be a 15 seg..,. but you could possibly add more 
chips in a row..

>Stick led bar graphs under a panel of sliders, and you could have a cool
>synth programming interface, with visual feedback of recalled patch
>parameters...
yeh, cool.. or use electroluminescent stip [like they use to backlight  
laptop screens] for a really flat interface

cheers
dan
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