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Old 22nd Feb 2021, 4:55 pm   #3
Al (astral highway)
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Join Date: Nov 2006
Location: London, UK.
Posts: 3,450
Default Re: Running DC brushless PC cooling fans

Originally Posted by duncanlowe View Post
I wouldn't be so sure. I experienced an application where a 12v computer fan was run over voltage.

Hi Duncan, thanks for sharing that experience.

Only in this case, what do you make of the fact that the 120mA current rating is only achieved at 19.4V, not 12V?

It leads me to think that 12V is idling speed and the max rating is for when the CPU is running hotter.

For example, we're all familiar with the sound of a fan suddenly kicking into much higher revs. These sorts of revs are exactly what I'm hearing at 19.4V and 120mA - hence my curiosity.
Best wishes, Al

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