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Thread: Volt modding fans

  1. 12-09-2003, 01:33 AM #1
    fizur2002
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    Volt modding fans

    Could someone write up a Volt moding guide for fans please? I would really appreciate it if someone would.
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  2. 12-09-2003, 02:50 AM #2
    Bovon
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    Just what is it you need to know?... a 12 volt DC case type fan will run on any DC voltage from about 4 or 5 volts up to around 15 volts. The lower the volts, the slower the blade speed and vice-versa.

    All that is needed is a heavy duty variable resistor..called a rheostat..probably about 5 to 10 ohms and maybe 5 watts or so..stick it in the 12 volt lead between the voltage source and the fan...in ONE LEG (red wire) In series...not in parallel (across the positive and negative). Then when the 12 volts is turned on..you turn the shaft (like a volume control on an old radio or TV) until the blade speed is what you want.

    There will be 3 prongs or attach points on any rheostat..you need to use the middle one and either of the outside ones... From one outside to the other is not adjustable for voltage..just from the center or middle connector to either one of the other two.
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  3. 12-09-2003, 10:14 AM #3
    Rocketmech
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    Theres the old 12v -(+5v) =7v mod thats been around for sometime, and lowers the fan rpm , thus reducing fan noise. Plenty of info on it. Although, Bovon's variable speed idea is better.

    Fixed speed mod
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  4. 12-09-2003, 11:20 AM #4
    fizur2002
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    What i want to do is to make the fans spin faster than normal without using a baybus.
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  5. 12-09-2003, 11:45 AM #5
    Rocketmech
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    Increasing the voltage would speed it up, but may burn it up as well or in the least lower its lifespan due to heat from more amps. Not to mention more noise.

    Here ya go !

    Your on your own
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  6. 12-10-2003, 09:18 AM #6
    zybch
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    You'd probably end up damaging your power supply if you start along the lines of the incredibly silly (unless you like the smell of a burning power supply) 12+5=7 mod.
    If its a CPU fan you want to speed up, why not get an adaptor so you can use a larger fan.
    I have an 80mm to 120mm adaptor that I've used on a CPU and the noise is slightly less but the airflow is significantly more. The only drawback is that you'll end up with very little room inside you case once you've got 3 120mm babies running
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