Converting a few case fans to one usb? - AVS Forum
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post #1 of 3 Old 07-24-2014, 11:30 AM - Thread Starter
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Converting a few case fans to one usb?

Basically what I'm trying to do is hook up 2 (maybe 3) 100mm case fans to something and then a USB port to make a cooling station for my Xbox One. I've seen articles on stripping fan connectors and USB cables to connect the red and black wires and make a USB powered fan, but I don't want 3 separate cords. I've done some research and see that a usb is only 5 v and the fans run at full speed at 12 v. Something with a switch would be awesome, but something that turned on automatically would be just fine. I'm guessing I should run them full speed at all times, but a nice current through the system is all I'm looking for. Any help is greatly appreciated. I'm an electicity rookie but I can splice up some wires haha.
Thanks. Oh, and did I mention, I'm cheap. That's part of it too.
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post #2 of 3 Old 07-25-2014, 09:06 AM
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12VDC is what a car cigarette lighter is, right? So if you have an old adapter or anything of that nature laying about, you could wire that up.
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post #3 of 3 Old 07-25-2014, 12:55 PM
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Any 12V "wall wart" DC power supply can be used, but you need to add up the current draw (measured in mA) of all the fans you plan to use, and make sure the total is well below the rated output of whichever supply you want to use. I would suggest using a supply with at least a 30%+ headroom (since those things are so cheap and may not perform as well under continuous load as what is shown as the listed rating).

I've used a variable-output 'universal' wall wart to drive a number of small case fans, and was able to step down the output (12V/9V/6V) to run the fans slower than 'full speed'.

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