DC 8-16V PWM Fan Temperature Controller with Digital Temperature and RPM Display Description This compact controller provides precise PWM speed control for compatible four-wire fans while showing real-time temperature and fan RPM on a digital display. It reduces noise and power use by matching fan speed to measured temperature and can cut fan power off at low temperatures when supported. The small footprint makes it easy to integrate into systems with limited space. Key benefits - Precise speed control: Intelligent four-wire PWM control adjusts fan speed continuously from 1 to 100% to maintain target temperatures and reduce noise. - Real-time monitoring: Built-in digital display shows temperature and RPM for clear, immediate status checks. - Energy and noise reduction: Automatically lowers or stops fan operation at low temperature to save energy and eliminate unnecessary noise. Note that the fan cutoff function is limited to lower current fans as specified. - Compact and easy to install: Small design fits tight spaces and integrates with case, CPU, and many server cooling systems. - Broad compatibility for four-wire systems: Works with standard four-wire PWM fans that use a 25 kHz, 5 V PWM signal. Features and specifications - Operating design supply: DC 12V nominal. - Circuit operating voltage range: DC 8-16V. Adjust supply according to the fan voltage rating. - Controller standby current: 40 mA (measured at 12V, reference value). - Maximum fan current: up to 3.5 A. - Fan cutoff capability: supports turning fan power off at low temperature when fan current is within 3 A (direct power cut). - PWM control range: 1-100% with accuracy +/-0.5% (signal duty cycle is not the same as actual RPM). - PWM frequency: 25 kHz +/-1 kHz. - PWM signal amplitude: 5 V (no load). - Temperature measurement range: -9.9 to 99.9 C. - Temperature measurement accuracy: less than 1.2 C error between 0 and 50 C; less than 2 C error outside that range. - RPM display: supports display of 10,000 RPM and theoretically supports up to 30,000 RPM in