On 9 May 01, at 17:38, Alex Salmon wrote:
> 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.
3 wire fans are 1 pulse = 1 revolution.
A simple electronic speedo circuit should do it.
Aussie
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