LM317T Voltage Regulator with Pass Transistor

Our project is a pedal-powered charger for portable electronic devices. The torque applied by a rider to the pedals is used to turn an electric generator. The generator is attached to a voltage regulator circuit that provides a 12-volt car cigarette lighter adapter and a 5-volt USB interface to connect your portable electronics. A series of capacitors are used to temporarily store the excess energy generated by the cyclist for later recharging.



http://www.youtube.com/watch?v=qV9Zy8-Uy1Y&hl=en