USB Hack – How to Make a USB Bike Generator!

Your bike has no cigarette adapter so you can get a USB charger and recharger your gadgets?

No problem, you can build yourself a USB bike generator that actually uses a USB charger hooked up to your bike so it will charger your gadgets while you ride.

The basic idea for the USB Bike Generator is to use a suitable stepper motor as a generator and a voltage regulator circuit to maintain the 5 volts needed for the USB ports.  In this instructable I will show you how to build this generator and through testing show that it is 70% efficient at converting the power from the generator to the power needed for the USB port.

via instructables

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