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How to build the simplest DC Motor Speed Controller(Using Potentiometer and MOSFET)Updated. But it needs to be a high power POT (unless the motor is really low power)This circuit is very inefficient(but its really simple!) in controlling high power(torque) motors. To control such motor you're better off with PWM. PWM is much more efficient. Here's a video showing how to build PWM speed controlhttps: //www.

RRLyo.. Please comment if you tried building this circuit !! The output voltage is gate voltage minus threshold voltage. The variable resistor(Potentiometer. The voltage at gate with reference to source(Vgs) determines the current flow through the motor. My Wife Wants A Trial Separation Vs Legal Separation. When the Vgs reaches around 2v the channels starts to open, as we keep increasing Vgs ,the channel becomes wider allowing greater current to flow.