Make a Dynamo to Charge Your Phone | Voltaic Systems Blog

We show you how to build a hand crank dynamo with a few commonly available parts. Our battery packs are designed to charge from power sources (like solar) that have fluctuating voltages and currents and output nice clean USB power. In addition, they can charge and discharge at the same so you can tu…

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Source: Make a Dynamo to Charge Your Phone | Vo…
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