Feature●【Monolithic Capacitors】: The filter capacitor uses monolithic capacitors, which come with premium chips, making the circuit stable and reliable.●【The Pwm Dc Brushed Motor Speed Controller Is Equipped With An External Speed Control Knob Mainly Changes The Duty Cycle Of The Output Square Wave, So That The Average On-Load Time Varies Between 0】: It mainly changes the duty cycle of the output square wave, so that the average turn-on time of the load varies between 0-, to achieve the purpose of adjusting the brightness / speed of the load.●【Large Heat Sink Area】: The heat sink area used by this controller is more than twice that of similar products on the market and can meet the needs of motors from 60W to 150W.●★ Before leaving the factory it has been tested for voltage, current and function. The controller uses all original semiconductor chips imported from STMicroelectronics. The circuit is stable and reliable.●【Advanced Pwm Speed Control Technology】: The controller uses PWM speed control technology, which has the characteristics of high conversion efficiency, wide speed range and stable performance.Description Adjust the potentiometer knob to change the governor output duty cycle, engine speed changes.