you can use circuity to condition the power so you can have a 5v continuous output. If you hook a DC motor to a gearbox that ramps up the speed you can get some good voltage. Just add a couple large capacitors and a five volt voltage regulator and you have a cell phone charger. The capacitors will help smooth out the spikes and the voltage regulator will convert a wide range of voltage to a continuous 5 volts. I believe as long as you generate at least 8 volts the regulator will output 5 volts.
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