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Any 12v D.C. power supply from a phone charger or whatever will work to power a computer fan. Since it is already converted to dc you dont have to worry about being shocked and if you reverse the wires it just reverses the fan direction. Try to find the same amp rated charger as the specs on your pc fan to maximize fan performance and life. Higher amp charger will push the fan faster than a low amp charger. For three wire fans just use the power and ground wires.