Two switch per key keyboards

[Theo]

In old manuals the contact rails and contacts  are mostly made from a
Phosphor-copper alloy to avoid oxidation problems.
Sorry the only source I knew for this stuf is out of biss for 12 years now.
:-(
Please note that all modern manuals do use plain copper (rubber contacts on
PCB), so the oxidation problem may be not that big.

Some suggestions:
1) Use coper wire and see how it does.
2) Use copper instalation wire and coat it with silver, same way as you coat
PCBs.
3) Old home organs often have multiple contacs per key, butcher one and use
the manuals.
     With a little DIY you can make two 3 1/2 manuals in to one larger one.
4) Same as abouve, only use the contacts and rails.

 Hope this helps,
 Theo


----- Original Message -----
From: skinny bastard <skin_job at hotmail.com>
To: <synth-diy at node12b53.a2000.nl>
Sent: Monday, June 12, 2000 6:08 PM
Subject: Two switch per key keyboards


> I'm attempting to modify a one-switch per key to be a two switch per key.
I
> do think That I'll be able to do it with the keyboard subassembly I
> currently have, but I was wondering if anyone knew for sure what the bar
> (which carries the voltage that the keys connect the resistor chain to
when
> pressed) was made of. I'd assume copper, but I want to be sure. Also, does
> anyone know where to get this material.
>
> James Tiller
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