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Old April 25, 2009, 10:53 AM
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Default How do I wire the exhaust fan to a slower speed?

I built a older 478 box for my niece but the exhaust fan (which is 3 pin) seems to be running at full speed and is noisy is there a way to wire it so I can slow it down to reduce the noise?
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Old April 25, 2009, 11:03 AM
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Like this?
techPowerUp! :: Easy 7V Mod for Fans
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Old April 25, 2009, 11:31 AM
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Thanks I am going to try this it basically says that you switch the placement of the red and yellow wires
Edit it didn't work the fun doesn't turn on at all , oh well she is just going to have to listen to a noisy fan while computing lol

Last edited by Shadowmeph; April 25, 2009 at 11:47 AM.
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Old April 25, 2009, 11:44 AM
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:rtfm: WAIT A MINUTE

you have a 3 pins what Shadow refer you is for a 4 pins molex, on a 3 pins the yellow is the detector of fan speed.

Look in your Bios if you can set the speed of the fan
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Old April 25, 2009, 11:51 AM
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or just use a resistor to lower the voltage
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Old April 25, 2009, 12:50 PM
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Diodes work.
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Old April 25, 2009, 02:16 PM
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Yes and it's more easy than too compute the resistor usally 1.5 drop per diode.

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Diodes work.
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Old April 25, 2009, 02:24 PM
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Yes and it's more easy than too compute the resistor usally 1.5 drop per diode.
Depends on the diodes. Many common non-LED diodes actually come in at around 0.7V a piece.

If you've got a 3-pin fan plug, and the motherboard doesn't support voltage control, your options are somewhat limited without doing some recabling/rewiring.
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Old April 25, 2009, 02:56 PM
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0.7 , Ya it's true, I mix it with the bridge, too longue time I have not use simple diode....
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