[sdiy] Substitute for pin matrixes?

[karl dalen]

A hall switch with inbuilt cmos switch would be neat?!!??!½!@£$€€{{[[].

KD

--- Den lör 2010-01-23 skrev John Mahoney <jmahoney at gate.net>:

> Från: John Mahoney <jmahoney at gate.net>
> Ämne: Re: [sdiy] Substitute for pin matrixes?
> Till: synth-diy at dropmix.xs4all.nl
> Datum: lördag 23 januari 2010 21.20
> More half-baked ideas:
> 
> Make a 2-sided PCB for the matrix -- rows on one side,
> columns on the other (obviously). At the row/col
> intersections are circular pads. Each circle is divided in
> half, where one half is the row contact and the other is the
> column contact. You need to bridge the gap with a conductor
> to make a connection at that point.
> 
> For contacts, I'm (again) thinking magnets, but this time
> they need to be conductive (at least on one surface). Copper
> or aluminum tape should work, or maybe conductive paint.
> 
> Make a sandwich with the PCB on top, a thin sheet of
> plastic for insulation, and a piece of steel. The steel
> gives the magnets something to pull on so the connections
> are fairly solid.
> 
> Or...
> 
> Nicolas Collins, in his fun book "Handmade Electronic
> Music" (http://www.nicolascollins.com/handmade.htm) discusses
> the use of computer keyboards. They *are* switch matrices.
> You could use fishing weights to hold down the keys.
> 
> John
> 
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