keyboard modifications

[harry]

Actually I use a different circuit.  I have a constant current source
feeding the top
of the resistor string, and short out the string with contact closures to
ground...
So an open collector NPN would probably work OK. I think the saturation
voltages
would match pretty well if you hammer them (lots of base drive). I haven't
tried this.

I agree with TomG that the midi/dac is a more useful solution these days....

Yes the analog switch would have to be GOOD... not a CD4016, or 4066... have
to
be one of those Maxim switches or like that....

H^) harry

WeAreAs1 at aol.com wrote:

> In a message dated 12/11/00 5:37:48 PM, harrybissell at prodigy.net writes:
>
> <<  the EFM style needs a low contact resistance. You could possibly
> trigger a good analog switch.. >>
>
> It would have to be an *awfully good* analog switch!
>
> Mike B.