The speed control circuit of a DC brush motor changes the output of the VMOS transistor connected to it through an external resistance network, achieving the function of controlling the speed of electric tools.
4V ～ 20V
3.5mA ～ 5mA
The output end of the DC brushless motor speed control circuit is equipped with a 14V clamp structure. By bridging the internal resistance network, the PWM duty cycle output can be changed to control the motor speed.
7V ～ 24V
7mA ～ 10mA