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PWM DC Motor Speed Controller 6V–28V 3A 80W Adjustable 0–100% Duty Cycle with Potentiometer Switch
PWM DC Motor Speed Controller 6V–28V 3A 80W Adjustable 0–100% Duty Cycle with Potentiometer Switch
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PWM DC Motor Speed Controller — 6V–28V 3A 80W Adjustable Duty Cycle
Take precise control of any DC motor, fan, or LED load with this PWM (Pulse Width Modulation) speed controller. By adjusting the duty cycle from 0% to 100% via the onboard potentiometer, you can smoothly vary motor speed, fan airflow, or LED brightness without the heat and energy waste of resistive voltage dividers. The wide 6V–28V input range and 3A/80W capacity make it compatible with a broad range of DC motors and loads.
Specifications
| Input Voltage | DC 6V – 28V |
| Max Continuous Current | 3A |
| Max Output Power | 80W |
| Duty Cycle | 0% – 100% (fully adjustable) |
| Control Method | Potentiometer (onboard knob) |
| Switch | Built-in on/off switch |
| Operating Temperature | -40°C to +85°C |
| Package | SMD construction |
| Model | 3A 80W PWM |
| Origin | Mainland China |
How PWM Speed Control Works
PWM control rapidly switches the motor power on and off at a fixed frequency. By varying the ratio of on-time to off-time (duty cycle), the average voltage delivered to the motor changes — controlling speed without the energy loss of resistive methods. At 50% duty cycle, the motor receives approximately half voltage; at 100%, full voltage. This method is highly efficient and generates minimal heat in the controller.
Wiring Guide
- Connect power supply: Connect your DC power supply positive (+) to the controller’s VIN+ terminal and negative (−) to GND.
- Connect motor/load: Connect the motor or load positive (+) to the controller’s OUT+ terminal and negative (−) to OUT−.
- Power on: Toggle the built-in switch to ON.
- Adjust speed: Turn the potentiometer knob clockwise to increase duty cycle (higher speed/brightness), counter-clockwise to decrease.
- Fine-tune: For precise control, use a multimeter to measure output voltage while adjusting the potentiometer.
Why Choose This PWM Controller?
- ✅ Wide voltage range 6V–28V — compatible with 6V, 12V, 24V DC systems
- ✅ Full 0–100% duty cycle — complete speed range from stopped to full speed
- ✅ 3A / 80W capacity — handles most small to medium DC motors and fan loads
- ✅ Built-in on/off switch — convenient power control without disconnecting wiring
- ✅ High efficiency — PWM method wastes minimal energy as heat vs. resistive control
- ✅ Wide temperature range — -40°C to +85°C for industrial and outdoor applications
- ✅ Compact SMD design — small footprint for integration into enclosures and projects
Common Applications
- DC motor speed control (drills, pumps, conveyor motors)
- PC and industrial fan speed regulation
- LED strip and bulb dimming (DC LED loads)
- Arduino and Raspberry Pi motor control projects
- 3D printer heated bed power control
- Solar charge controller load management
- Electric bicycle and scooter throttle control
- Aquarium pump and aerator speed control
Frequently Asked Questions
Q: Can I use this to control an AC motor?
A: No. This controller is designed for DC loads only. Do not connect AC power or AC motors.
Q: What happens if I exceed the 3A current limit?
A: Exceeding the rated current will cause the controller to overheat and may damage the MOSFET. For loads above 3A, add a heatsink or select a higher-rated controller.
Q: Can I use this for LED dimming?
A: Yes. This PWM controller works excellently for dimming DC LED strips and bulbs. Ensure your LED load does not exceed 3A / 80W total.
Package Contents
- 1× PWM DC Motor Speed Controller (6V–28V 3A 80W)
