JB> KH> My new BIOS has CPU fan monitoring available, but I didn't get the
JB> KH> adaptive cable with the MB, so I'd like to make one, if possible.
JB> KH> First, does a 2-wire CPU fan support monitoring, or would I need a
JB> KH> 3-wire type?

JB>you need three, many 2 wire fans have three terminals internally - you
JB>could add the missing wire.

JB> KH> The MB has a 3-pin fan monitoring connector -12v +12v
JB> KH> -12v; am I correct in assuming that I'd run 2 wires in series
JB> KH> after the fan to the appropriate pins (if 2-wire is supported), or
JB> KH> would I need some other components?

JB>extra components would be needed to get a rate signal from a 2 wire fan.

JB>it's easist to tap the monitioring terminsl on the fan PCB. (typically
JB>right next to the power terminals)

HUH? None of the fans in my computers have
EVER had a fan PCB. Am I not understanding?

JB>+12 / -12  doe that been 24V measured between the pins ?

JB>I'd expext one of the pins to connect directly to the mootherboard ground
JB>(that'd be 0v) the other win will have about 12V on it when powered up,
JB>the third one will be the "fan rate" terminal

JB>and would probably measure a moderate resistance to the Ov pin

JB>  Ken  *** MultiMail/XT v0.41



JB> -=> Bye <=-

JB>---

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