> Get someone to help you then. =A0If you get enough voltage
> from the coil, it could be as simple as a single transistor
> with the coil driving the base directly.

Not that easy, at 0,5 rotations per second compared to 10 rps the
signal amplitude will be 20 times less. Some ultra low power
differential Op Amp would do the job nicely since the coil's signal is
differential by its nature. I'd adwise SW to learn to Op Amps first.
It's not that hard (provided Ohm's Low is under the full command, of
course)

> A pencil is a bad choice since it's not magnetic and
> therefore wont concentrate the flux thru the inside of the
> coil. =A0That's probably about the right diameter though.
> Some steel (magnetic) bolt with a few layers of thin
> magnet wire should work.

Yes, a small magnetic bar from CRT Monitor, or PC power supply etc.

-- =

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