Free Electric
By using a defected speaker, lets create a dynamo for your bicycle. By using, the ready fixed magnet and the copper coil in the use speaker, we can easily turn it in to a generator that sell USD70 bicycle lights set. like below:
some other similar products selling hot in uk.
Ok the idea is just easy.
You just need 1 speaker , 1 magnet, double sided tap/glue, and finish the following video.
However, you may need other device to test it. like electric motor, magnet, battery, copper wires, LED lights and etc.
or you can test like below
Electric generated once the magnet moves and magnet flux being cut by the copper coil.
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