Mosfet Dc Motor Speed Control Circuit. Circuit analysis the heart of the circuit is an ir2104 mosfet driver chip 1. This allows full control of the motor speed and direction.
Connect any dc motor and give the 12 volt dc supply at input. Using two more colored wires connect the speed and reverse to two digital pins of your choice. Using two colored wires connect the vin to your micro controllers vin pin and the gnd to the gnd pin.
The circuit of pwm dc motor speed controller is built using operational amplifiers op amp that functioned as a pwm pulse generator.
By using a proper heatsink and cooling methods this circuit can handle currents up to 30a. The gate controls the current flow from source to drain. The circuit of pwm dc motor controller with mosfet in the figure below is a circuit of variable speed dc motor with pwm method that uses a power mosfet and driver be able to control a dc motor up to 3 ampere. Using two more colored wires connect the speed and reverse to two digital pins of your choice.
