1. When an external PWM signal is input, the amplitude is 5V, and the recommended PWM frequency is 1 kHz–10 kHz. 2. For analog input, use the onboard 5V and GND terminals to connect an external potentiometer (10 kΩ–100 kΩ) for speed adjustment, or apply an external 0–5V analog signal—ensure it shares a common ground with the board. 3. For forward/reverse rotation control, the motor must come to a complete stop before changing direction. Changing direction while the motor is rotating may damage the circuit board. After removing the shorting jumper, an external switch can be connected for direction control. 4. The mainboard provides a 5V power supply (via onboard 5V and GND). An external 5V supply may be used, limited to ≤10 mA. 5. Speed pulse output: amplitude is 5V; each pulse corresponds to one motor revolution. Precautions: 1. The mainboard power circuit does not include a fuse. Users are advised to add external overcurrent protection. Reversing the power supply polarity will cause permanent damage to ICs on the board. 2. Overcurrent sampling protection is active at the motor output during normal operation. Due to the module’s high power and current capability, do not artificially short the output terminals when the module is malfunctioning. Short-circuiting may result in component failure or burnout. Always begin testing with low voltage and low current, then proceed to higher levels only after confirming stable operation. As this is a bare PCB module, ensure proper insulation of all wiring connections. Avoid contact between high-voltage sources and board components. 3. When the drive module operates above 100W or in ambient temperatures exceeding 30°C, ensure adequate heat dissipation and monitor thermal performance.