1.770V 30A PWM DC Motor Speed Controller. It can be directly connected to a DC brushed motor and the potentiometer adjusted to set the motor speed. Key benefits and features Simple speed control: PWM based, direct connection to the motor, adjust speed with the potentiometer for quick tuning. Toy car enhancement: When used in a children's toy car, the controller output can be connected to a Forward and Reverse switch to enable forward and reverse drive. Not a power supply: This is not a power supply module. It must be connected to a motor (and to a suitable power source) to adjust speed. Without the motor, the controller output will not change on a multimeter. Compatibility and safety: Suitable for DC brushed motors; cannot be connected to 220V household electricity. Use and precautions: Ensure positive and negative connections between the power supply and the controller are correct before powering on to avoid damaging the circuit board. Reversing polarity may burn the circuit board. Do not touch the heat sink with wiring, as this may also cause damage. For the motor, there is no need to distinguish between positive and negative. If the rotation direction is wrong, swap the two motor wires. 23 practical use scenarios Modify a children's toy car: integrate the controller with a Forward/Reverse switch to enable smooth forward and backward motion controlled by the pot. Small robotics project: drive a DC brushed motor in a compact robot or platform where simple, adjustable speed control is required. Educational demonstration: use in an instructional kit to show PWMbased speed control, motor response, and the importance of correct wiring and polarity. Specifications at a glance Voltage range: 1.770V (as specified) Current rating: up to 30A Motor type: DC brushed motors Control: Potentiometer adjustment for speed Output usage: Requires connection to motor and external power source; not a standalone power supply Safety notes: Polarity must be correct between power supply and controller; rotation direction adjusted by motor wire swap Applications: Toy cars, small robotics, educational PWM demonstrations Electric safety: Not suitable for 220V household electricity