I will need these 1800rpm fans to work overtimes.
I did not want to change them, as the summer is coming soon, and we have some hell of a hot summer here in Greece. It was time to start thinking of another way to control these fans. Moreover, the fan stalled once in one month of test-operation, without any particular reason. I had clear readings from the tacho of the fans, yet i could not achieve low speeds without stalling the fan, nor had i an acceptable range of speed steps. I decided to give another try to these fans with a PWM averaging rpm controller. The inlet fans are 2 Zalman 1800rpm, that unfortunately did not work as expected with the same circuit. The outlet fans, are 2 Coolermaster 1200rpm fans, that are controlled using this PIC 3-Wire Fan RPM Controller. I have 4 120mm fans in my PC cabinet, each one controlled separately from a dedicated PIC.
I made this circuit for my PC System Health Monitor project.
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