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TylerPlumb 05-08-2008 10:06 AM

How to run 4-6 small computer fans off of one switch?
Hi everyone,
Let me start off by saying I am brand new to these forums - joined today! Hopefully I can find some help here :)

I have a small project going, and I would like to run four (maybe six in the future) small computer fans off of a light switch. First and foremost, is this possible?

If it is, how would I do it? I'm a plumber with very little experience in electrical; I know how to splice and positive and negative, but that's about it!

Also keep in mind that computer fans probably don't require that much voltage, so will I also need some sort of converter?

Thanks so much! :thumbup:


Joba Fett 05-08-2008 12:22 PM

Not a converter, you'll need a transformer.
The transformer must match the voltage of of the fans, and be rated (va) to handle the up to 6 fans you are going to have.

And please remember to wash your hands before you touch the fans, transformer, or switch.

sevver 05-08-2008 12:58 PM

I would say that you could use an old computer power supply, and simply plug it into a switched outlet. You could connect the fans up to that pretty easily. One of the fans I can see laying around here runs on 12 volt DC.

joed 05-08-2008 02:11 PM

Well it depends on if you are refering to 12 volt DC PC fan or 120 volt AC muffin fans like larger computer equipment uses. Some of them are even 240 volt.

If they are 12 volt then get yourself a 12 volt power supply or battery charger and plug it into a switched receptacle.

TylerPlumb 05-09-2008 06:39 PM

1 Attachment(s)
Hey, thanks for the responses all!

This is what I'm using:

Each one reads "DC 12V 0.14A" I am guessing that is 12 volts, 0.14 amps??

joed 05-09-2008 09:30 PM

12volt DC fans. Use an old PC power supply or a battery charger to power them.

micromind 05-09-2008 10:15 PM

The power supply you'll need must be 12 volts DC, and for 6 fans, at least 0.84 amps. It can be more than 0.84 amps, not less. There are a multitude of plug-in types that are 12 volt DC and 1 amp. Any of these will work.

If there is a plug on the cord, just snip it off, and strip the wires back some. The fans will be wired in parallel, meaning that one wire from each fan will tie to one wire from the power supply. The other wires from each fan tie to the other wire from the power supply. If you have 6 fans, you'll have 2 splices each containing 7 wires.

You're a plumber, one wire of the power supply is the cold water supply, and the other wire is the hot water supply. You're connecting 6 sinks (fans). Wire the fans the same way.


TylerPlumb 05-09-2008 10:55 PM

Thanks for the posts fellas, going to make my weekend trip to Home Depot. Will report back with results soon... :thumbup:


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