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120mm fan wiring...

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leapinlew:

I have a 120mm fan in the back of my last cabinet that I need to wire. The fan was supposed to connect using a molex connection into a standard power plug from a PSU (like a hard drive power plug).

I used a laptop in this project and don't have access to a PSU style plug. I want to wire the fan directly to a wall wart. The problem is, the fan has a red, yellow and black wire. I know the red is 5, the yellow is 12 and the black is ground. What I am unsure of is how to wire the fan. Do I need power to both the 5 and 12?

Any suggestions? Here is a pic of the guts of my cab

There isn't a lot of room, and I need to get this fan working.

What I've done is connect a red wire to a 5 volt wall wart and when I turn it on, the fan won't spin. However, if I give the fan a little spin it will start turning. The 5v wall wart I'm using have an output of DC 5.3V 500ma. So I'm thinking the 12v also has to be plugged in as well...

Any help?

northerngames:

use the 12 volt line instead



Teebor:

Typical of fan manufacturers to complicate things.

Black is Ground
Yellow should be 12 volt
Red should be the sense wire (this is only used to sense the speed of the fan by a controller)

Green Giant:

I may be wrong but I am pretty there is only one power wire for that fan, the 12V line.  The other wire should be the control line to help keep the fan quieter.  With just the 12V and ground, it should spin full speed all the time.  You can ignore the other wire and possibly drop a pot in there to control the speed if you want.

-edit- damn, beat me to it.

leapinlew:

ah...

damn. Thanks for the info. That did it. I was really over complicating things.

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