Fan control – Making Life as Quiet as Possible

After listening to the fans running wide open for a few hours. I decided I did need to implement some fan speed control. Being that the fans have the 4-pin PC connector. They have PWM speed input and tachometer output. And I want to make use of both.

Part 29 of the DCL1 electronic load project

Some items used:
MG Chemicals 4860P solder paste