Product overview This DC 12V PWM automatic fan temperature controller module provides reliable, adjustable cooling for computers, power amplifiers, and industrial control equipment. It automatically adjusts fan speed based on measured temperature to reduce noise at low load and increase cooling when temperature rises. Key benefits - Automatic temperature-based control keeps equipment within safe operating temperatures without manual intervention. - Reduced noise and energy use by running fans at low speed until extra cooling is needed. - Simple, compact module for easy installation in enclosure cooling and amplifier thermal management. - Adjustable temperature threshold and four-step fan speed control let you fine tune cooling behavior for your application. Main features and specifications - Function: PWM temperature-controlled fan speed regulator using a dedicated temperature control chip. - Rated operating voltage: DC 12V. The module accepts a broad input range for power supply flexibility: DC 5-30V or AC 4-20V, but the control board is designed for use with 12V DC fans and 12V DC power supplies. - Fan specification: DC 12V fans. Choose fans with current consumption under 200 mA to reduce heat on the control board. - Temperature adjustment: Linear, adjustable range approximately 45-100 C. - Speed control: Fan speed selectable in four gears and automatically driven by the temperature sensor using PWM. - Size: approximately 43.6 mm x 22 mm x 13 mm. - Temperature sensor: wire length about 10 cm. The sensor should be mounted on a heatsink or firmly pressed to the measured surface for accurate control. - Behavior: On power up the fan runs at low speed. When the sensor detects temperature above the preset threshold, the circuit increases PWM duty to accelerate the fan until temperature stabilizes. If temperature continues to rise, the fan accelerates toward full power. Compatibility and installation notes - Use only 12V DC fans and a 12V DC power supply for the controlled fan output. Other fan voltages are not supported. - Recommended per-fan current under 200 mA to limit heat generation on the module. If multiple fans are used, ensure the total current and power source can supply them. - Sensor mounting: apply a heatsink to the sensor location or press the sensor firmly against the monitored surface for accurate temperature reading and control. - Wiring check: after connecting to 12V DC, the fan should run at low speed. Short the sensor input briefly to confirm the fan can run at full speed. Adjust the precision trim potentiometer while the sensor is exposed to maximum measured heat to set the full-speed threshold. Use a multimeter to monitor output voltage if needed for calibration. Practical use scenarios - Computer cooling: maintain lower idle fan speeds for quiet operation and ramp up cooling automatically during heavy CPU or GPU load to prevent overheating. - Power amplifier thermal management: control cooling for amplifier heat sinks so fans increase speed only when the amplifier temperature rises, improving acoustics and component longevity. - Industrial control panels and power supplies: automatically manage enclosure airflow to stabilize internal temperatures across varying load conditions. What is included and how it performs - Compact PCB module with PWM temperature control circuit and temperature probe. - Designed for stable, linear temperature threshold adjustment and reliable automatic fan speed regulation. - Simple to integrate into existing 12V DC cooling setups with minimal wiring and tuning required. Safety and best practices - Verify correct polarity before power-up to avoid damage. - Choose fans and wiring rated for the expected current. - Secure the temperature probe and, if needed, add a heatsink for accurate temperature sensing. - Do not use fans or power supplies with voltages other than 12V DC for the controlled fan output. This module offers a compact and effective solution for automatic, adjustable PWM fan control in 12V DC cooling applications, balancing quiet operation and responsive cooling performance.