smallembedded

Simple DC motor driver board

Overview

The pwm DC motor speed regulating circuit composed of NE555 regulates the speed of the DC motor. The method is to use the 555 time base circuit to make a PWM generator. The speed of the DC motor can be changed by adjusting the output pulse width of the 555. The 555 time base circuit and its peripheral resistors, capacitors and other components form a PWM generator, and the frequency of the output pulses can be adjusted through the resistors and capacitors. In this design, adjusting the resistance of potentiometer R2 can change the width of the output pulse at pin 3 of the 555 output terminal, thus changing the speed of the motor. The output of the 555 cannot directly drive this kind of motor, so a high-current N-channel MOS field effect transistor is connected to the output terminal ③ pin to drive the DC motor.

Design Files

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Update:2025-06-20 05:44:10

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