Mexibilly
Mexibilly
Not sure what the 4th wire, blue, is on this PC fan. Black red and white I know, blue though, not a clue
4th wire on PC fan?
- Thread starter Mexibilly
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Speed control, most likely. Many four-wire fans use a fixed voltage on the power connection then adjust speed based on the fourth wire...
Cheers!
Cheers!
OP
OP
Mexibilly
Mexibilly
I should have known. I have a potentiometer, I'll just have to figure out the wiring
The yellow wire was actually the tachometer lead.
That's the "third wire" on a 3-wire or 4-wire fan...
Cheers!
Blue is the speed control line. It uses a PWM signal usually something around 25KHz for the period.
