4 Pin PWM Fan Controller 5-12V, Manual PC Fan Speed Controller with On/Off Switch, Noise Reduction

Four-wire PWM Fan Speed Controller - compact, manual fan regulator for PWM-compatible case and CPU fans. Key benefits - Flexible power input for varied systems: nominal operation at DC 5 to 12 volts while the unit can be powered from 5 to 15 volts when needed; note that fan voltage is kept constant by the controller. - Precise, low-noise speed control: advanced PWM speed regulation reduces operational noise while maintaining effective cooling at low speeds. - Simple manual operation and on/off control: a potentiometer provides intuitive speed adjustment and an integrated switch lets you start and stop the fan quickly, helping to extend fan and equipment life. - Broad compatibility with modern fans: four-wire PWM interface matches common CPU and chassis fan connectors for easy installation and control. Main features and specifications - Operating voltage: nominal DC 5 to 12 V; can be powered from 5 to 15 V supply with fan voltage held constant. - Maximum fan current: not greater than 4 A; actual current also limited by the switch and connector. - Controller idle power draw: less than 20 mA with no fan connected. - PWM characteristics: output PWM frequency 20.5 kHz. PWM drive level approximately 5 V when powered at 12 V and approximately 4 V when powered at 5 V. PWM duty range adjustable from 1% to 100%. - Output connector: standard 4-pin CPU/case fan header, 2.54 mm pin pitch. - PCB and mounting size: PCB 22 mm by 20 mm, knob screw protrusion 15 mm, mounting hole diameter 7 mm. - Interface: four-wire PWM only; not compatible with 2- or 3-wire fans that lack PWM control. Operation notes and setup - Observe correct polarity and supply voltage when connecting the controller and fan. - Potentiometer travel: turn fully counterclockwise to reach the off position and fully clockwise for maximum speed. - Some fans with reverse timing behavior may spin in the opposite direction relative to adjustment; in that case, a PF solder jumper can be shorted to invert the PWM response. Ensure the fan is powered off before soldering to avoid damage. - Default start PWM is set to 1% for smooth startup. Suitable applications - Desktop PC and small workstation fan control for quieter operation during light loads. - NAS, home server, or small rack equipment where controlled airflow and reduced noise are required. - DIY electronics enclosures, custom cooling projects, and prototypes that use four-wire PWM fans. Important warning - This controller only drives four-wire PWM fans that support PWM speed control and will not operate 2- or 3-wire fans. Please verify fan compatibility before use. Package contents - Fan speed controller unit.