PC Fan Speed Controller 3/4-Pin Compatible 12V Output with Variable Speed Knob

Compact fan speed controller for 3-pin fans with broad compatibility and precise manual control. Key features and specifications - Designed primarily for 3-pin DC fans and compatible with 4-pin PWM fans; partially compatible with some 2-pin fans. - Output voltage: 12 V. - Output current: 0 to 0.7 A. - Output power: 0 to 8 W. - Efficiency: approximately 85 percent to 90 percent. - Fan cable length: 30 cm. - Simple rotary control: turn clockwise to increase speed, counterclockwise to decrease speed, and turn fully counterclockwise to switch off. Why you need this controller - Gives manual, stepless control of fan speed for quieter operation or tailored cooling. - Small form factor and standard 3-pin compatibility make it easy to add to existing fan setups without complex wiring. - Efficient regulation minimizes wasted energy while keeping fan performance predictable across the control range. Practical advantages - Easy to install and operate with a single rotary knob that provides intuitive control during use. - Works with common PC and electronics fans that accept a 12 V supply and draw up to 0.7 A. - Short cable length keeps wiring neat inside small enclosures or modded systems. Material and build notes - The controller housing is 3D printed. Surface imperfections from the printing process may be visible but do not affect electrical function or performance. If cosmetic surface finish is a concern, this product may not be suitable. Typical applications - PC case fan speed adjustment for quieter everyday operation and increased airflow during heavy use. - Small electronics cooling for routers, network equipment, or hobby projects where 12 V fans are used. - DIY and modding projects that require compact, manual fan control without software or additional circuitry. Compatibility and installation tips - Best used with 3-pin DC fans; 4-pin PWM fans will operate under voltage control but may not use PWM signaling for automatic control. Some 2-pin fans may work depending on their design. - Ensure the fan current does not exceed 0.7 A and the fan power does not exceed 8 W to avoid overloading the controller. - Mount the controller where the rotary knob is easily accessible for manual adjustments. Custom options - Custom cable configurations may be available as an option; check the available variants or product options for details. This controller provides a simple, reliable way to control fan speed and noise while maintaining safe operating limits and clear manual control.