.. tested it, and found we needed more voltage, so we ended up using 2 coils. Each coil is 400 turns of #30AWG enameled magnet wire. We used a simple hand-held coil winder, and made up a new center insert to get the coils the right size. The ...
.. Skippy the Hamster powers this night light by running on his excercise wheel, the same concepts and low-rpm alternator design could be applied to a school science project using different energy sources! A small wind or hydro turbine ...