keyboard contact rubber fun

[Jeroen Proveniers]

> -----Original Message-----
> From: Martin Czech [mailto:czech at Micronas.Com]
> Sent: Friday, August 25, 2000 9:22 AM
> To: patchell at silcom.com
> Cc: synth-diy at node12b53.a2000.nl
> Subject: Re: keyboard contact rubber fun
> 
> 
> 
> :::    One thing I always wanted to try was using an iron 
> plunger going into an
> :::inductor.  The only thing that stopped me was it seemed 
> like an awful lot of
> :::work, both mechanical and electronic.  But this should be 
> able to give you a
> :::signal that is proportional to how far the key is pressed 
> down.  It has some
> :::very interesting posibilities.
> 
> But how do you ensure that the pulse comes in the very moment 
> the svanner looks
> at it?

Just brainstorming:
Every key has some circuitry. A peak detector, and a polarity detector sort
like that. If you press the key, a positive voltage is induced, and when
released a negative (or vice versa). This must be processed, and _then
scanned. Very expensive solution, but the idea is good. Although you can
only detect attack velocity and release velocity, no aftertouch, or the
circuit must be able to detect supersmall pulses. I think the dynamic range
is very big.

JJ