The circuit he built takes the PWM signal output by the card, cleaning it up before converting it to a corresponding DC voltage.

I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor. I had a few problems with the PWM part mainly because the ...

Deciding between PWM and DC case fans can be confusing. At the same time, it is important for the optimal performance of your computer.