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External Cooling Fan powered by USB 2.0

I have a desktop installed under a desk in a wall unit. We are going to cut two ventilation openings to enable convection circulation. I would like to put a small fan inside the case to blow air out (and pull cooler air in). And I would like to have the fan turn on and off with the computer.

Is there any sort of fan that could draw its power from a USB 2.0 connection? Since the USB 2.0 can charge an iPod or Blackberry, I should be able to cut the end off of a USB 2.0 cable, solder on a connector, and then connect a box fan.  I will make sure that the fan matches the voltage of the USB 2.0

I have several internal fan kits that cool hard drives.  I would use one of those fans.

I would rather not run a wire into the case.

Thanks.


Larry
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computerlarry
Asked:
computerlarry
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6 Solutions
 
CallandorCommented:
The trouble is, USB power is 5v and 500ma, so it would be difficult to drive anything that would be effective in cooling.  Why not buy 12v case fans that are designed for cooling a case and that plug into the computer's molex connectors?  These would automatically kick in when the system is turned on.

http://www.ultraproducts.com/index.php?cPath=28
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_Commented:
>> I would rather not run a wire into the case << 
Since you seem to know something about hardware hacking, you might might want to rig them use the unused floppy power cable(s). Might be easier to run wire that way. Just a thought.   : )

If you can get your hands on a couple of powersupply fans (110v), just plug them into a timer and set it to ON/OFF when you are on the computer. Sloppy work around, I know, but it works.
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nobusCommented:
i would follow Callandor's advice, since the molex connectors are designed for a connection to fans.
As for running a wire into the computer, you can use a pass through for the waire, or make a plug on the PCI shield
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burrcmCommented:
Doesn't it already have a case fan. You can buy an AC fan to mount in your ventilation hole and plug it in the power point.

Chris B
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burrcmCommented:
Or to go with your point of turning it on with the pc, use a case fan plugged into a molex connector in the pc, but mounted externally in your vent hole. Any fan mounted in the pc is only going to move the air around which is already in there, it won't draw air in from outside the larger enclosure.

Chris B
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ridCommented:
If I remember correctly a USB port can give 500 mA at 5 V, giving power enough for a 2.5 W fan, which may be on the smallish side for your needs. If you're comfortable with making your own HW solutions, I'd suggest you use the 12 V leads from an unused connector (as has been suggested) and mount a connector of some sort in the backplane for hooking up the fan. You could use an ordinary phono plug or whatever.
/RID
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tfjeffCommented:
some power supplies have a molex connector on the back of them, so you could hook up an external fan.  You can also get a cardslot bracket that gives you external molex connectors....check this out:
http://www.xoxide.com/pci-power-bracket1.html
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_Commented:
tfjeff: Now That's a nice little piece of hardware.   : )
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waffleironheadCommented:
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waffleironheadCommented:
computerlarry,

were these what you were looking for?

waffle
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_Commented:
Thank you much.    : )
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