Voltage controlled Variable Resistor??

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.

iceng5 years ago
An N type MOSFET is the vary variable resistor you want.
As the Gate voltage increases the lower the resistance becomes.