If the computer is not used for a long time, it will encounter some problems. In particular, the fan noise problem, so what can be done about this situation? DC Fan speed regulation not only makes the dc fan more stable, but also reduces the noise of the dc fan. How does the dc fan speed up?
Generally, the dc fan of the power supply can be adjusted by regulating the working power supply voltage, and a temperature control circuit can be added to adjust the rotating speed. The fan with PWM speed control function (typically four line), is can't work with adjustable voltage to achieve the purpose of speed control, there must be a dedicated PWM speed regulating control circuit to adjust, the warm feeling to detect temperature to adjust the duty ratio of PWM signal, so as to achieve the goal of control fan speed.
There is also a way to add a small resistor to the dc fan's line, which also reduces the voltage of the dc fan.
The above is a small method of power supply dc fan speed regulation. If the voltage is reduced, there is no way to solve the problem. Then, it is recommended to replace the dc fan.
