Nick made a temperature-based computer fan controller that use a reverse-biased diode for temperature sensing –
From a design standpoint, the only complaint I have about my Shuttle small form factor desktop is the extremely fragile on-board fan controllers. All three have died over the past two years after being used to regulate the single on-board fan with respect to the system temperature. The last one gave up the ghost a few days ago as my machine suddenly shut down and a red light came on inside.
Figuring that I should just go build a more substantial fan controller myself, I promptly went to the lab to look for a thermistor. Unable to find one, I settled for the next best thing: a diode.
μblog: engineering from the trenches » How to make a temperature-based fan controller without a thermistor – Link.
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