12V DC 4-Wire PWM Fan Speed Controller | Rotary Switch Module
12V DC 4-Wire PWM Fan Speed Controller | Rotary Switch Module
Gaqqee 12V DC Four-Wire PWM Fan Speed Controller
Take full control of your 12V four-wire PWM fans with the Gaqqee PWM Fan Speed Controller Module. Featuring a smooth rotary switch, this compact board lets you dial fan speed from fully off to 100% output — ideal for PC chassis fans, CPU coolers, and custom cooling builds. CE and RoHS certified for peace of mind.
Key Features
- Full Speed Range: PWM output from 0% (off) to 100% for precise airflow management
- On/Off Switch Built-In: Rotary potentiometer turns fully counter-clockwise to switch the fan completely off
- Adjustable Start-Up Speed: Onboard trimmer resistor lets you set the initial spin-up speed at power-on
- Reverse-Sequence Fan Support: Solder-bridge the (PF) pad to invert PWM signal direction for non-standard fans
- Standard Connector: 2510-4P staggered pinout (2.54 mm pitch) — plug-and-play with most CPU and chassis fan headers
- Low Self-Consumption: PCB draws less than 20 mA with no fan connected
- Premium Build Quality: CE & RoHS certified; stable performance across its full operating range
Technical Specifications
| Operating Voltage | DC 12V (8–15V range; match fan voltage) |
| Max Fan Current | 3A (expandable via separate power cable) |
| PCB Self-Consumption | <20 mA (no fan connected) |
| PWM Signal | 5V / 25 kHz |
| PWM Output Range | 0% – 100% |
| Initial PWM Adjustment Range | 0% – 60% |
| Input | Red (+) and Black (−) wires |
| Output Connector | 2510-4P staggered, 2.54 mm pin pitch |
| Certification | CE, RoHS |
| Motor Type | DC Motor |
| Country of Origin | Made in China |
How It Works
- Verify correct polarity and that your power supply voltage matches the fan's rated voltage.
- Connect power (red = positive, black = negative) and plug the fan into the 4-pin output connector.
- Turn the rotary knob clockwise to increase fan speed; fully counter-clockwise switches the fan off.
- Use the small onboard trimmer to fine-tune the initial speed when the controller is first powered on.
- If fan speed moves in the wrong direction, solder-bridge the (PF) pad (power disconnected first!) to reverse the PWM signal for reverse-sequence fans.
Important Compatibility Note
This controller is designed exclusively for 12V four-wire PWM fans (e.g., standard CPU and chassis fans with PWM support). It is not compatible with two-wire or three-wire fans.
What's in the Box
- 1× PWM Fan Speed Control Module
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Frequently Asked Questions
Q: What type of fans are compatible with this PWM fan speed controller?
A: This 12V DC PWM fan speed controller is compatible exclusively with 12V four-wire fans that support PWM speed control, such as standard CPU coolers and PC chassis fans. It cannot regulate two-wire or three-wire fans, so please confirm your fan's wiring before purchasing.
Q: Can I use this controller with a power supply other than 12V?
A: Yes — the module operates within an 8V to 15V DC input range, though the nominal operating voltage is 12V. Always ensure your fan's rated voltage matches your power supply voltage to avoid damage.
Q: What should I do if my fan speeds up when I turn the knob counter-clockwise (reverse behavior)?
A: This indicates a reverse-sequence fan. You can correct this by solder-bridging the (PF) setting pad on the PCB. Always disconnect power completely before soldering to prevent damage to the module or fan.
Q: How do I turn the fan completely off using this module?
A: Simply rotate the potentiometer (rotary switch) fully counter-clockwise. The PWM output will drop to 0%, switching the connected fan off entirely without cutting power to the module itself.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.