12V PWM Fan Speed Controller with Temp Sensor for PC - Automatic Control and Manual Adjustments

Product overview This digital 4-pin PWM fan controller precisely regulates fan speed for standard 4-pin PWM fans. It provides both manual speed control and automatic temperature-based control. The controller only adjusts fan speed; it does not switch fans on or off. Key benefits - Precise temperature-driven control prevents unnecessary noise while keeping components cool by smoothly increasing fan speed as temperature rises. - Fine manual tuning gives full control over airflow and acoustics with 10% to 100% range in 5% steps. - Compact, board-level design and standard fan connectors make integration into chassis, cooling systems, or custom projects straightforward. Main functions - Full digital control with accurate temperature settings and precise speed regulation. - Manual speed control from 10% to 100% in 5% increments. Settings are saved automatically. - Automatic temperature control: a base low speed is used until the configured acceleration temperature is exceeded, then fan speed ramps smoothly. Full speed is reached when the temperature equals or exceeds acceleration temperature plus acceleration width. The output never turns off. - Supports converting 3-wire tachometer input to 4-wire PWM control and saves configuration parameters automatically. - Multiple temperature zone combinations supported for flexible control behavior. Technical specifications - Operating voltage: nominal DC 12 V, functional range 8 to 18 V. - Fan connector: 4-pin PWM interface (2510-4P). Large 4-pin interface can draw chassis power. - Tachometer input: 3-pin connector (2510-3P) for reading fan RPM from 3-wire fan headers. - Quiescent current: no-load current not more than 20 mA. - Maximum controlled fan current: less than 3 A. - PWM output range: 10% to 100%. The controller does not turn the output fully off. - Operating temperature range: -10 C to 60 C. - Temperature sensor type: NTC 50 K, B = 3950. - Probe options and ratings: small black-head probe rated to 120 C, ring probe rated to 110 C with a 4.2 mm metal ring head for mounting. The small black probe has low thermal mass for fast response and is suited for tight spaces and air temperature measurement. The ring probe is suited for direct attachment to heatsinks or warm surfaces. - Board dimensions: 34 mm x 19 mm x 11 mm (excluding extended connector). - Default factory settings: low speed 20%, acceleration temperature 30 C, acceleration width 5 C. - Indicators: onboard LEDs display mode and saved states; parameters are stored automatically after a brief period. Operation summary - Manual mode (no probe installed): use the up and down buttons to step speed in 5% increments. Each change is automatically saved after 20 seconds. Indicators show when settings are saved and when limits are reached. - Automatic mode (probe installed): manual setting becomes the base low speed. When measured temperature rises above the configured acceleration temperature, the controller increases PWM output smoothly. Full speed occurs when measured temperature equals or exceeds acceleration temperature plus acceleration width. - Example: base low speed 20%, acceleration temperature 35 C, acceleration width 15 C. When probe temperature is below 35 C the fan runs at 20%. Above 35 C the