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Published on 22 Mar 2014 | over 3 years ago

Salt water battery + Joule thief circuit.

Materials : Copper plate, Aluminum Foil, Kitchen Towel, Warm Salt water, Joule thief circuit
Bigger copper plate & Aluminum Foil is more powerful.
This battery lamp turned on one hour.. but if you replace salt water, it will be lasting until the foil almost erode.
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