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Voltage controlled Variable Resistor?? Answered


I'm making a circuit in which a person spins a motor shaft, generating current. The faster the motor spins, the lower I want the resistance to be to a part of a separate circuit. I'm thinking of some sort of voltage controlled resistor I can make. Any instructions? Thanks.
~plmqaz

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iceng (author)2011-09-13

An N type MOSFET is the vary variable resistor you want.
As the Gate voltage increases the lower the resistance becomes.

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