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Mini PWM 12V DC Fan Speed Controller – 3A Adjustable Module
Mini PWM 12V DC Fan Speed Controller – 3A Adjustable Module
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Mini PWM DC Fan Speed Controller – Precision 4-Wire Fan Control
Take full command of your 12V four-wire PWM fans with this compact, high-quality DC fan speed controller. Built for hobbyists, PC builders, and electronics enthusiasts, this single-board module delivers smooth, adjustable speed control via a simple potentiometer — no complicated wiring required. Made in Mainland China.
Why Choose This PWM Fan Speed Controller?
- Adjustable Speed Range: Full PWM output from 0% to 100%, giving you complete control over fan speed for cooling and noise management.
- Built-In On/Off Switch: Conveniently cut power to the fan without disconnecting any wiring.
- Stable Performance: Metal construction with reliable circuitry ensures consistent, long-lasting operation.
- Simple Wiring: Red and black input leads with a standard 2510-4P CPU/chassis fan output connector (2.54mm pin pitch) — plug in and go.
- Start Speed Trim: A dedicated onboard potentiometer lets you fine-tune the minimum start-up speed (0%–60% range) for your specific fan.
- Reverse Timing Fan Support: Short the onboard (PF) solder point to reverse the PWM direction — compatible with reverse-timing fans after simple modification.
- Ultra-Compact Size: At just 2.5 × 2 cm, this module fits in the tightest of builds and enclosures.
Technical Specifications
| Operating Voltage | DC 12V (works in 8–15V range) |
| Max Fan Current | 3A (limited by switch and connector) |
| Board Idle Draw | <20mA (no fan connected) |
| PWM Signal Mode | 5V / 25KHz |
| PWM Output Range | 0% – 100% |
| Start Position Trim Range | 0% – 60% |
| Input Type | Red & black leads / 2510-3P output (optional) |
| Output Connector | 2510-4P, 2.54mm pin pitch (CPU/chassis fan socket) |
| Material | Metal |
| Dimensions | 2.5 × 2 cm |
| Package Contents | 1 × Speed Control Module |
| Country of Origin | Made in Mainland China |
Important Notes Before You Buy
- ⚠️ This controller is designed exclusively for 4-wire, 12V PWM fans (e.g. CPU fans, chassis fans). It is NOT compatible with 2-wire or 3-wire fans.
- Always match the fan voltage to the power supply voltage.
- Turn off power before making any adjustments to the (PF) solder point to avoid component damage.
- Potentiometer: turn counter-clockwise to minimum/off, clockwise for maximum output.
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For more guidance on safe electronics handling and DIY circuit best practices, visit the U.S. Consumer Product Safety Commission (CPSC).
Learn more: Motor controller
Frequently Asked Questions
Q: Will this PWM fan speed controller work with my 3-wire or 2-wire fan?
A: No. This module is specifically designed for 4-wire PWM fans operating at 12V. It controls fan speed via the dedicated PWM signal wire found only on 4-wire fans. Standard 2-wire and 3-wire fans do not have this signal wire and cannot be controlled by this module.
Q: What voltage does this DC fan speed controller support?
A: The module operates on DC 12V and is compatible with a supply voltage range of 8–15V. Always ensure your fan's rated voltage matches your power supply to avoid damage.
Q: How do I set the minimum start speed on this controller?
A: There is a small trimmer potentiometer on the board dedicated to start-speed adjustment (range: 0%–60%). Use a small screwdriver to fine-tune it so your fan spins up reliably from a standstill when you first turn the controller on.
Q: My fan speed changes in the opposite direction when I turn the knob — what should I do?
A: Your fan is likely a reverse-timing PWM fan. With the power disconnected, use solder to short the (PF) pad on the board. This reverses the PWM direction, allowing the potentiometer to control a reverse-timing fan in the correct direction.
