Precautions:

• DC motor governor input is DC, can not directly connected to the AC (for example: home 220V AC), otherwise it will burn!
• DC power supply positive and negative terminals 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 potentiometer knob to change the governor output duty cycle, the motor speed changes.