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RPM sensor with molexed rheostat

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Damian

Member
Joined
Mar 4, 2003
Location
Acton, MA
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?
 
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.
 
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?
 
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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