[SLUG] [OT] 3 wire fans

[Alex Salmon]

hi
i have one of those 3 wire fans on my cpu. My question is how do i measure
the rpm of my fan from it. not through software like lm_sensors but in real 
life ie so it dosent even have to be in a pc. 

Is there some kind of eq i can use so i can measure the voltage across the 
3rd wire and get a rpm value.

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