keyboard modifications

[harry]

Hello Michael (et al)

Correct... the EFM style needs a low contact resistance. You could possibly
trigger
a good analog switch... but the DAC is the best way to go.  If you don't want to
have the keyboard scan, try the 4532 8 input priority encoder. Very easy to
generate
a word with... uhh... priority ???

H^) harry

WeAreAs1 at aol.com wrote:

> 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