tom:
>and Hall-Effect sensors for the tach with the latter using a fraction of the
>current of optical versions. I used 1/8" rare-earth magnets from Radio
>Shack. The problem is that it requires more space than an optical wheel.


just curious about this tom, but how have you assembled your magnetic sensor ?
i always assumed that the way this would be done would be to have a hall sensor pointing at the edge
of a metal gear, with a small permanent magnet the other side of the sensor from the gear... is this
how it works or do you have the magnet fixed to the rotating parts, a little like a digital odometer
for a bicycle ?

regards,
Simon

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