keyboard contact rubber fun

[Hairy Harry]

Most keyboards have a scanning matrix... usually bytewide
(8 bits). A clever design would use this to power only those
hall devices that are being scanned at the time... so power
could be a lot lower.

Would this work... depends on the hall device...?

The same would definatly work with led / phototransistor

H^) harry


>From: Martin Czech <czech at Micronas.Com>
>Reply-To: Martin Czech <czech at Micronas.Com>
>To: dragonser at clara.net
>CC: synth-diy at node12b53.a2000.nl
>Subject: Re: keyboard contact rubber fun
>Date: Thu, 24 Aug 2000 17:30:19 +0200 (MET DST)
>
>
>:::Dear Martin
>:::know I know why the contacts sometimes need changing .
>:::I think it would be possible to use reed contacts and magnets to replace
>:::the rubber contacts ....might it also be possible to use hall effect
>:::devices ?
>
>No, it must be passive, 76 keys gives 76 times the power consumption
>of an otherwise nice hall sensor, much too much for the often
>cheap power supplies.
>
>Yes, velocity means two reeds, one magnet.
>
>m.c.
>

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