Powering a computer fan

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PencilHead

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Okay, I searched and I'm sure there's somnething about this somewhere, but I can't find it. How do I power up a computer fan. I know it's got to be DC current after a transformer, but how much? Do I need to salvage the transformer also?:confused:
 
I read somewhere to many bonghit to remember where right now but avy transformerthat has a 9 volt or greater man 12 volts will work. The way I remember is if you have the wires wrong in won't run so just reverse them and it will work i used a ole nintindo transformer.
 

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