How do I wire fan for RPM readout

[arden]

I want to make a 4 pin connector so I dont have to use mb power.I know you can buy one , but I could also wire one with spare parts I have .A wire diagram would be nice. Any one done this .I'm sure several have.

 

[The Doors]

Hi arden,
you can take a look here, but the Rpm signal work only if the fan is @12v, or more deeply, want a ground of -12v, absolutly not in the other way

 

[Tweak]

Hi arden,
you can take a look here, but the Rpm signal work only if the fan is @12v, or more deeply, want a ground of -12v, absolutly not in the other way

Doors is right you will need to have it connected to -12v power and have the RPM wire connected to the motherboard. Personaly I don't see why you would want to not use motherboard power

 

[The Doors]

Well, Tweak, coz the alimentation of the PS is more stronger than the one provided by the Mobo

 

[brothernod]

so is there anyway to run your fans below stock voltage and still get an rpm readout??

 

[The Doors]

Personally I've tried only with 7v, and doesn't work at all the Rpm signal, but I suppose which is the same with other voltages or a rheostat

 

[arden]

The reason is I dont want to burn out the fan header on my abit kt7a mb. I'm using a sk6 with delta fan and have heard it could burn out the header.

 

[The Doors]

And infact this is the way to go, coz Delta's fans, like clone, are really stronger, and wants 'higher' wattage to work, wattage which the Mobo can't provide!