keyboard modifications

[WeAreAs1 at aol.com]

In a message dated 12/11/00 4:29:03 PM, mysynth at hotmail.com writes:

<< What kind of keyboards are people modifying for DIY use?

I have three different old keyboards here... one Sequential Circuits 
Six-Track and two Casios.  I disassembled them with an eye towards 
cannibalization and found identical rubber-bubble type contacts.

On exploring further, I tried to ohm-out the switches on the keys and found 
a fairly consistant 150 to 200 ohms is the best I could do.  Is this typical 
for this style switch?  My guess is this resistance would reign havoc with 
the EFM keyboard controllers (asking as they do for 100 ohm @ 1% tolorance). 
>>

If you wish to use this type of rubber-contact keyboard for generating 
control voltage, the best way would probably be to connect the keyboard to a 
DAC, and let the DAC create the accurate CV that you need.  Another way would 
be to remove the rubber contact assemblies and build your own wire-contact 
switches to mount underneath the keys.  Neither of these solutions are neces
sarily very elegant, but are workable nonetheless.

Michael Bacich