I posted to this thread once before...I think it got lost in the multitude of replies to
the OP. Take a look at this website. It describes how to do exactly what is wanted. The
bonus is that it does work.
http://hot-streamer.com/hilo90mhz/electronics/prop_clock.htm

Regards,
Stephen D. Barnes


> I think you will have trouble getting enough power out of a magnet
> and coil. I was curious about this, so I built a test setup. For a
> coil I used the coil that drives a pendulum in quartz clocks. These
> coils are wound from exceptionally thin wire and so have a very high
> number of turns. I rectified it with a common bridge, filtered it
> with 220 ufd, and put a load on it. I was spinning a neodymium magnet
> at 3,000 RPM.
>
> I had to reduce the load to 10K before I got more than 5 volts. 10K
> at 6 volts is just 0.6 mA. I think you'll never get to 30 mA without
> quite a large coil and magnet.
>
> --
>
> Bryan Mumford
> Santa Barbara, California
> http://www.bmumford.com

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