DWM
09-12-02, 09:32 PM
Hey all. I have a fan in my PS that's EXTREMELY noisy. The PS runs cool, so I want to slow the fan down a bit.
The easiest way to do this seems to put a resistor in series with the fan to cut its voltage. That only involves me cutting into one wire too. The question is, what size resistor do I use?
The fan says 0.3A, 12VDC. Am I correct in assuming, then, that the fan's resistance is 12/0.3 = 40Ohms? (V/I=R)
So if I cut the red wire to the fan (the 12VDC line), and stuck a 40Ohm resistor in there, would it drop my fan voltage down to 6V?
Does 6V sound good to you guys? Or do you think that's too low? Maybe a 20Ohm resistor .. that would drop the voltage to 8V?
Also .. a 20 or 40Ohm resistor would be dissipating a couple Watts of power. Would it be okay like that? Or would it die after a while?
The easiest way to do this seems to put a resistor in series with the fan to cut its voltage. That only involves me cutting into one wire too. The question is, what size resistor do I use?
The fan says 0.3A, 12VDC. Am I correct in assuming, then, that the fan's resistance is 12/0.3 = 40Ohms? (V/I=R)
So if I cut the red wire to the fan (the 12VDC line), and stuck a 40Ohm resistor in there, would it drop my fan voltage down to 6V?
Does 6V sound good to you guys? Or do you think that's too low? Maybe a 20Ohm resistor .. that would drop the voltage to 8V?
Also .. a 20 or 40Ohm resistor would be dissipating a couple Watts of power. Would it be okay like that? Or would it die after a while?