Electro-piston flashlight using NO batteries or source of electricity. WHAT!!!
The electro-piston utilizes the principle that whan you move a magnet through a coil of wire it induces an electrical current. It's a somewhat straightforward project it uses a few Neodinium magnets (I've got it to work with one magnet though). The wire I got from an old transformer. 4 diodes I pulled off a circut board (it works without any but using one will make sure you don't blow your LED, and using four will make it more efficient). I also built a mechanism that turns only one way, no matter what. and a bevel gear transmission so check it those out, videos below.
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