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Specifications:Operating voltage: DC4.5V-35VOutput current: 0-5A Outputpower: 90 w (maximum)Quiescent current: 7ua (standby)Duty cycle pwm: 1% -100%Frequency of pwm: 20 khzSize: 30mm x 26mm x 14mm (without handle) Precautions:Dc input governor motor is dc, cannot directly connected to ac (for example: 220 v ac house), otherwise it will burn!The positive and negative terminals of the dc power supply do not reverse, otherwise the governor may be damaged.The motor can be positive or negative, when the direction of operation and expectations do not match, you can adjust the line order to change the direction.Adjust the knob of the potentiometer to change the duty cycle of the regulator output, the motor speed changes. Package Includes:2 x DC PWM Motor Speed ​​Controller