This is a motor speed controller circuit diagram built based Maxim MAX4295. This with this circuit you will be able to control the speed of motor rotation.
Resistor R1 biases the potentiometer to match the input range of U1. Full counter-clockwise rotation of the pot corresponds to maximum-speed reverse rotation of the motor. Mid-scale on the pot corresponds to motor off, and full clockwise rotation of the pot produces maximum-speed forward rotation in the motor.
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