12V 4 Pin PWM Fan Controller, Single Channel Speed Control with Switch, Low Noise for PC Case Fans

Compact PWM Fan Speed Controller for 5 to 12V Fans Why you need this controller - Precise, quiet fan control: intelligent PWM speed regulation lets you set fan speed accurately to reduce noise and save power during light loads. - Broad compatibility: 4-pin interface and a 12V single-circuit design work with most 12V PWM fans and common fan specifications for easy integration. - Simple installation and reliable operation: plug and play wiring, on off switch, and stable low-power operation help prolong fan and equipment life. Key features and specifications - Input voltage: 5 to 12 V DC for flexible use with typical 12V systems. - PWM frequency: 25 kHz, compatible with most 12V PWM fans on the market. - Duty cycle range: adjustable from 0 percent to 97 percent for a wide speed range. - Interface: 4-pin connector combining signal and power for easy plug and play. - Controls: main rotary potentiometer for real-time speed adjustment, separate potentiometer to set fan start speed. - On off switch and power indicator LED for straightforward operation. - Small power footprint and stable operation suitable for low-power applications. - PF pad function: short the PF pad to invert the working duty cycle for compatibility with certain special fans. How it solves problems - Reduces noise without sacrificing cooling by allowing fine-grained PWM adjustment. - Prevents fan stalling by letting you set a dedicated start speed. - Extends equipment lifespan through smoother, lower-stress fan operation and stable power handling. - Makes retrofits and upgrades easier with a standard 4-pin connection and simple wiring guidance printed on the PCB. Basic setup and use - Connect a 5 to 12 V supply, observing the input wire order shown on the PCB silk screen. One or more unused pins may remain empty depending on wiring. - Turn the main potentiometer and open the switch to power up; the LED indicates normal power. Turn the main potentiometer clockwise to increase fan speed. - Adjust the blue potentiometer clockwise to raise the fan start speed if needed. - If a fan requires inverted duty behavior, short the PF pad to reverse the working duty cycle for compatibility. Practical applications - PC and workstation cooling where noise control and reliable start behavior are important. - Small electronic enclosures, routers, or control cabinets that use 12V fans and need quieter, more efficient airflow. - Hobby and maker equipment such as 3D printers or single board computer projects where compact, adjustable fan control improves thermal management and component longevity. What makes it stand out - High PWM frequency and wide duty cycle range allow smooth, precise speed control. - Separate start-speed adjustment and PF pad inversion increase compatibility with a wider range of fan designs. - Compact, low-power design provides stable operation and helps extend the life of fans and driven equipment. This controller offers a straightforward, flexible solution for anyone needing reliable PWM control of 12V fans with easy installation and tuning options.