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Captain Capacitor

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  1. -------------------------------------------------------------------------------- I am building a tachometer for a class. I will use it to demonstrate the measurement of RPM (revolutions per minute) for a fan. The basic setup is as follows: I will have a laser beam pointed at a photoresistor, which is apart of a circuit. The fan will be placed in between the beam and the photoresistor. Every time one of the fan blades crosses the beam path, the resistance of the circuit will decrease enough so that a "trip current" is flowing. This trip current will go through a not gate, which will output a l
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