Bicycle Generators

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http://forum.allaboutcircuits.com – Hello, I am trying to build a bicycle generator with my Physics students and am using a 1 wire Delco alternator. We have a gear ratio or mechanical advantage of about 60 to 1 when you include the bicycle gears and the large pulley(Rear wheel and alternator pulley. We are able to create a voltage of 15 to 16 volts once the alternator reaches the cut in speed(self energizing) However when put a load on the circuit it becomes very hard to pedal. We hooked a 40 watt lamp up to the circuit directly through a 400 Watt inverter. It lights for a brief time but then becomes impossible to pedal. We put (Embedded)