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How do you hook up a PC case fan outside a computer?


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#1
BoggyP

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Well just want to say I'm a person who's interested in computers but you'll have to use small words because I know nothing about this topic. I want to connect 3-4 Case Fans to some sort of power source and use it to cool my 360 which I'm buying next week. I'm really confused on how this would be done as I don't know anything about a pc fan.

Thanks,
B.P.
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#2
jackflash1991

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I am not exactly sure of what you are doing but to run the fans you need a 12V DC current. I suppose you could just buy a cheap computer power supply and run the fans. This is the cheapest power supply on Newegg: http://www.newegg.co...N82E16817174030
Then you just connect it to the 4 pin molex connection. It looks like this:
Posted Image

PS: Welcome to geeks to go.

Edited by jackflash1991, 26 August 2007 - 09:42 PM.

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#3
BoggyP

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Well my problem is I have one of each in front on me. The fan plugs into a smaller one of those ( a 3-pin) like it plugs into 3 pins. The Power Supply Unit also plugs into the pins. I have two sides without pins. I got extremely confused, I think I could like cut the wires open aand stick them together (I think my dad knows how to connect wires together) but I don't know if that works. Unless Fans I buy new come with he pin side?
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#4
jackflash1991

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Yeah you can

just stick them together

. To see how they connect here is a 3pin to 4pin adapter: http://www.newegg.co...N82E16835999104
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#5
BoggyP

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That pictures isn't very clear, what colors would cross to what colors?
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#6
jackflash1991

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Sry about that, here: Posted Image
Black to black, red to yellow.
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#7
BoggyP

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Last 3 questions...I swear.

1. Do i need it to come out as two seperate 4 pin thinsg like int he pics?

2. Doesn't a PSU require a motherboard to power everything. I tried just pluging in a cd drive and it didn't work.

3. If i find a cheap one would pluging in a fan controller into the PSU be a better idea and plugs the fans into the controller. Don'twant to cause a fire or nothing.
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#8
jackflash1991

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1. Do i need it to come out as two seperate 4 pin thinsg like int he pics?

Could you reword that. I did not get what you meant.

2. Doesn't a PSU require a motherboard to power everything. I tried just pluging in a cd drive and it didn't work.

No, you do not need a motherboard. But for a cd drive I think you might.

3. If i find a cheap one would pluging in a fan controller into the PSU be a better idea and plugs the fans into the controller. Don'twant to cause a fire or nothing.

What do you mean? If you want a fan controller go ahead and get one. The only thing is that I think it might be a little hazardous if wires are exposed, but if you get something that is clean and not frail it would be ok.

Edited by jackflash1991, 26 August 2007 - 11:40 PM.

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#9
cmw2010

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A power supply will not run without being connected to a motherboard unless you jumper a couple of wires in the connector. I think you would jumper the green wire to any black wire.

Edited by cmw2010, 27 August 2007 - 04:52 AM.

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#10
BoggyP

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1. Do i need it to come out as two seperate 4 pin thinsg like int he pics?

Could you reword that. I did not get what you meant.


Like in your pic the 4 pin connectors connect to eachother and the 3 pin is plugged into one. Do i need to have two connectors to do it or just from 1 four pin molex to a 3 pin?

Edit: Also this will give it exactly 12V like the fans will be running at it's full rated speed?

Edited by BoggyP, 27 August 2007 - 09:10 AM.

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#11
jackflash1991

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Like in your pic the 4 pin connectors connect to eachother and the 3 pin is plugged into one. Do i need to have two connectors to do it or just from 1 four pin molex to a 3 pin?

Edit: Also this will give it exactly 12V like the fans will be running at it's full rated speed?

Yes you don't need 2 of those 3pin to 4pin adapters. you can just connect the 2 3pin connections into one of the 4pin molex connections. And yes, if you give it a full 12Volts then the fans will run at full speed.

PS:

A power supply will not run without being connected to a motherboard unless you jumper a couple of wires in the connector. I think you would jumper the green wire to any black wire.

But I thought the fans will still work. I have not really tried to run a fan by itself. Are you sure Cmw2010 that the fans will not work also?

Edited by jackflash1991, 27 August 2007 - 11:33 AM.

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#12
BoggyP

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Like in your pic the 4 pin connectors connect to eachother and the 3 pin is plugged into one. Do i need to have two connectors to do it or just from 1 four pin molex to a 3 pin?

Edit: Also this will give it exactly 12V like the fans will be running at it's full rated speed?

Yes you don't need 2 of those 3pin to 4pin adapters. you can just connect the 2 3pin connections into one of the 4pin molex connections. And yes, if you give it a full 12Volts then the fans will run at full speed.

PS:

A power supply will not run without being connected to a motherboard unless you jumper a couple of wires in the connector. I think you would jumper the green wire to any black wire.

But I thought the fans will still work. I have not really tried to run a fan by itself. Are you sure Cmw2010 that the fans will not work also?


Now i'm just confused. I know the motherboard thing will work. But first it had a 3-pin with 2 4-pin endings int he picture. Now it's 2 3-pins to a 4-pin could you draw a diagram, in like ms-paint. How do i tell it how many volts to give per 4-pin?
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#13
BoggyP

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http://img441.images...owtodoityl2.png

This is my understanding???
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#14
jackflash1991

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Good way to explain yourself. The drawing is perfect. The extra black and red wire is not needed for what you are doing. Red is not needed because it is a +5V current and we only need the +12V current. The Yellow is +12V and black is a ground wire. Here: http://en.wikipedia....Molex_connector

Are you ok now?

Edited by jackflash1991, 27 August 2007 - 01:11 PM.

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#15
BoggyP

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Ok last question does the 3rd speed regulator thing that goes to the MB just hang out?

Edited by BoggyP, 27 August 2007 - 03:16 PM.

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