Nov 16, 2007 · The first two pins supply the voltage required for the fan to spin. The third pin is connected to the fan speed sensor, reporting the current fan speed to the motherboard. ... (or video card) can ... The sense pin is used to relay the rotation speed of the fan and the control pin is an open-drain or open-collector output, which requires a pull-up to 5 V or 3.3 V in the fan. Unlike linear voltage regulation, where the fan voltage is proportional to the speed, the fan is driven with a constant supply voltage; the speed control is performed by ...

Eaton’s simple and economical elevator control fusible disconnect switch is an all-in-one solution that meets NFPA, NEC and local building codes related to hydraulic elevator applications. Additionally, it includes a shunt trip disconnect, relays to receive FACP signal and monitor shunt trip control voltage, as well as an aux contact. Some fan controllers attempt to compensate for this effect, but with limited success. The on/off cycling also can produce an objectionable clicking noise. One solution to these problems is to smooth the PWM signal with a low-pass filter and use that voltage to control a linear driver. For a 12-V fan, the resulting control voltage is typically 5 ...