DIY flashlight dynamo

Technology
DIY flashlight dynamo
shakeable_dynamo.jpg

Spotted in the MAKE Flickr pool:

Flickr user Lucky Larry built this shakeable dynamo using a few rare earth magnets and a bit of wire. If you’ve been wondering how to make one of these, he has a a four part series, which covers everything from how to wind the coil to how a bridge rectifier works.

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