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CASE FAN (Power by battery?!)

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foodfightr

Golden Member
I'd like to run a case fan off of a battery for a project I'm working on, it had red black and yellow wires. If you know how to do this, please post!
 
most (pretty much all) case fans are 12volt(DC). You could run them on less voltage, they'd just run slower.

Yellow wire is for the RPM Sensor in the fan, you don't need it if you're just running the fan. The black wire goes to the negative terminal of your battery, red to the positive and all will be peachy.
 
the closer to 12volts the better.

So, you could use 8 1.5v batteries (AA, C, D etc) in series, or you could run it off of one 9v battery (it'll run a bit slow though)
 
thanks a TON man, I just tested it, it works fine on 3 or more A, C, etc batteries. When tested with 8, it really cranks... what would you suggest as a safe method of linking batteries together?
 
Stick them in a toilet paper tube? Use a flashlight and just put your wires where the lightbulb would have been?
 
After looking at the pics, what he did was attach a wire from the negative terminal of one battery to the positive terminal of the next battery. he didn't run the wire all the way along the side of all the batteries, that wouldn't work at all (If they were facing opposite ways like they are).

Since the batteries are facing opposite ways and you're always connecting negative to positive, it's the same thing as stacking the batteries one on top of the other. It makes a series circuit. If you need more clarifing, PM me again.
 
I would say hit the Ratshack and get a battery box. Wire your fan into the positive and negative of the box, and use some double-sided sticky tape to secure it to the case.
 
Radio shack sometimes has battery storage units for 4 AA batteries. They look like the battery compartments you might see inside a boombox. They sell them for like hobby Kits. You might get a fan to run off a 9volt battery. If size is not that large a factor maybe a 120mm fan might work better. For a fan you could use simple fans without the 3 prong plugs.

The battery holders radio shack sells come in varying sizes. Might want to look at some rechargeable batteries. Probabbly D cells would last longer. Might be interesting to hook up a small solar panel and run it off of that or constantly recharge them. Anything you run off of batteries you have to evaluate for the amount power the fan uses.
 
Originally posted by: foodfightr
thanks a TON man, I just tested it, it works fine on 3 or more A, C, etc batteries. When tested with 8, it really cranks... what would you suggest as a safe method of linking batteries together?
Click to expand...

duct-tape. I'm not kidding.

Besides, 8 AA's can't kill you. 12V is enough to spark, and a 12V car or motorcycle battery will certainly hurt, but with 8AA's in series, the internal resistance will be so crazy high that you probably won't even feel a thing.
 
i have done this before i used a small fan to buy on a intergrated graphic heatsink it was only black and red though i am sure u have to rip yellow off and just use black and red i hooked mine up to a 9 volt the ones u stick on ur tongue i hooked it up to a bigger one 12v i think there called those huge ones i suggest u just dont run it on a battery.
 
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