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 ...

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

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