On Mon, 17 Aug 2009 07:44:45 -0400
olin_piclist@embedinc.com (Olin Lathrop) wrote:

> > Hard to beat simple, cheap, quite reliable & zero power.
> 
> But coils are simple, cheap, more reliable, and zero power too.  For a
> commercial version you wind the coil so that it's output directly
> drives the base of a transistor.

Yes, and at the speed the magnet would pass the coil normally, it
shouldn't be a problem to generate a nice signal easily. Reliable, no
bounce (either proper or 'surface quality' related ;-)

John
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