Generate Fan RPM Signal W/O Fan

usafltg

n00b
Joined
Feb 6, 2020
Messages
13
So the blue line is basically sitting at 0, at least when the multimeter is sampling it. And 6V on the red line is about half what I would expect. There's something sort of unusual going on here.

On bootup - Pin 1 initially reads 12V, then scales back to 6V. It's like it whirs up the Fan to Full speed for an initial test, then scales it back.
 

Mohonri

Supreme [H]ardness
Joined
Jul 29, 2005
Messages
5,751
On bootup - Pin 1 initially reads 12V, then scales back to 6V. It's like it whirs up the Fan to Full speed for an initial test, then scales it back.
That's actually normal--many fans won't start at 6V, but if they're already spinning, they'll happily keep spinning on 6V.
 
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