Description:Introduction to PWM:The full name of pulse width modulation: Pulse WidthModulator, referred to as PWM. Due to its special properties, it is often used as a dimming or DC motor speed regulation in DC loops.This circuit is a motor controller fabricated using the principle of pulse width modulation (PWM). There are two advantages to using this method to control motor speed: It mainly changes the duty cycle of the output square wave so that the average on-time on the load changes from 0-100% to achieve the purpose of adjusting the load brightness/speed. The advantage of using the pulse width modulation (PWM) method to achieve dimming/speed regulation is that the energy of the power supply can be fully utilized and the efficiency of the circuit is high. For example, when the output is a 50% square wave, the pulse width modulation (PWM) circuit consumes 50% of the power, which means that almost all of the energy is converted to the load power output. When the common resistance step-down speed regulation is adopted, the power supply must provide more than 71% of the output power of the power supply with a maximum output power of 50%, 21% of which is consumed by the voltage drop and heat consumption of the resistor. The pulse width modulation (PWM) method can be used to obtain the full supply voltage when the load is working, which is beneficial to overcome the inherent coil resistance of the motor and cause the motor to generate more torque. Feature: The products are equipped with external speed control knobs. Positive and negative control, (positive stop) products are equipped with positive and negative switches. Using high-quality chips, the filter capacitor uses monolithic capacitors, and the circuit is stable and reliable. The heat sink area used by this governor is more t