Op amp IC LM741; NPN Transistor MJE3055 ; NTC Thermistor - 10k; Potentiometer – 10k; Resistors - 47 Ohm, 4.7k; DC Fan (Motor) Power supply-5v; Breadboard and connecting wires Circuit Diagram. An RPM level below the user-programmable threshold causes the TC654 to assert a logic low alert signal (FAULT). WODE DC 12V PWM PC CPU Fan Temperature Control Speed Controller CPU Alarm Module. Fan Types. DC Motor Speed Controller Universal DC 12V 24V 10A Electronic Stepless Speed Regulator Switch for Car Truck Fan Heater Control. As the temperature increases so does the speed of the fan motor and vice versa. Fan controllers are inexpensive and will let you control all the fans on your machine. Using Pulse-width modulation (PWM), the fan's power supply is turned on and off at a fixed frequency. Note that the controllers are built to order and are generally not stocked, if you need a part immediately, email first to check the lead time . Controlling the CPU fan speed in your PC (or all the fans, in fact) is a way to give you more control over your Windows 10 experience. DC voltage control is the method to vary DC fan speed and this can be implemented by incorporating resistances in the supply wire. 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