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  1. #1
    Member Damian's Avatar
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    RPM sensor with molexed rheostat

    I just got a Yate Loon 120mm fan. It has the 3-pin fan header thing with the rpm sensor. I cut & spliced to have the power come from a molex and go through a rheostat, but how would I go about connecting the fan header so I could get an RPM reading?

  2. #2
    Member Bios24's Avatar
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    All you need is the yellow wire on the 3-pin connector and plug it into the board. That's all you need to read rpm's.
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  3. #3
    Member Ven0m's Avatar
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    1st - rheo has t obeon + line, not gnd
    2nd - simply use fan connector with only 1 wire for RPM readout.
    Perhaps pics in fan controller guide (sticky) might help a bit.

  4. #4
    Member Damian's Avatar
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    t obeon + line? Huh? I have it the rheo hooked up to ground; is that bad?

  5. #5
    Member Damian's Avatar
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    Tried doing just the yellow; it doesn't work.

  6. #6
    Member Damian's Avatar
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    Hey, never mind. It works in MBM5. I only got it down to 1450 RPM, though... damn.

    Could I just mount a fairly beefy resistor in series with the rheo to slow it down?

  7. #7
    Member Ven0m's Avatar
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    Sure, it should work.
    I didn't recommend putting rheo on GND, because RPM readout is series of high and low signals. If you modify GND rail instaed of +, instead of GND, you get some higher potential on fan, so low signals may have higher voltage and RPM sensor may not work in such cases.

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