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You need a strong magnet, a big coil of enameled copper wire, a large capacitor, and an efficient LED. And a few odds and ends. The basic design uses the magnet and coil as a generator, or dynamo. As you shake the assembly, the magnet slides up and down past the coil, generating voltage. You rectify the AC voltage and use it to charge the capacitor. You then discharge the cap through the LED to make light.

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