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240V Fan

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February 11, 2003 6:53:56 AM

Can I connect a 240V fan to my computer (I live in Australia, my power supply is 250V)? If so, what wires do I need to connect it to?

Thanks in advance.

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February 11, 2003 2:25:20 PM

A 240V fan would draw WAYYYYYYYYYY too much currnt from your power-supply even if you were able to put resistor after resistor in place to lower it to the computer's maximum 12V current. If you want to be able to use that fan, I would simply plug it in the wall socket - just run the wiring out the back of the case. I hope the cooling benefits are there though, because I can't imagine this fan is going to be small.

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<b>OverClocker's Law:</b> <i>My processor went that fast 12 to 18 months ago.</i>
February 12, 2003 1:10:10 AM

It could probably be wired into your power supply, which would need a switch (or a light dimmer) to turn it on and off. This would also require you to open your power supply, and that would void any warrantee. I would just go with a 12v 120mm fan or 2, gonna make much less noise and should cool your case well. That kind of fan (used to use one) will circulate air well in a small room (im guessing this fan is about 4 - 4 1/2 inches?)

Might be a bit of overkill, but its up to you. Just be careful messing with house current, and let us know how things turn out if you do!

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February 12, 2003 2:21:53 AM

check out evercool 120mm fans, 85CFM @ 32dBA, aluminum (though fins are plastic, sprayed with chrome looking paint). that's real quiet for such good flow. it's only $16 (12+4 shipping where i am), i just ordered one. it should come soon if you want to hear my results, i'd never heard of a fan with that good of specs
you'll be able to plug it into your power supply with a standard 4pin molex connector

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February 12, 2003 3:27:01 PM

WRONG! If you take that V = IxR then imagine the fan drew 1A it would take 240 Ohms of resistance to limit the flow to 1Amp at 240volt at 12 volts I = V/R so it would be 12/240 = 0.05 Amp - allmost nothing at all. The fan would not spin at all due to the DC supply in your computer (mains is AC) and even if it did it would spin very slowly or not at all (compare 0.05A to 1A).

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February 12, 2003 5:04:13 PM

fair-enough tombance, but my point was to tell that it was simply not worth it to splice it into the PSU regardless of the details, so how am I wrong if I simply left-out the details, as you pointed out

<b>Moore's Law:</b> <i>Processor speed doubles every 12 to 18 months.</i>
<b>OverClocker's Law:</b> <i>My processor went that fast 12 to 18 months ago.</i>
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February 12, 2003 7:04:09 PM

Dudes he is clearly talking about a fan that runs off 240VAC not 240VDC. AC driven motors are a bit different circuit wise but typically are available in similar powers as the DC units. A fan like that wouldn't work with DC even if you had a 240VDC supply much less a 5 or 12V DC supply.

I might try to rig a 5V, or 12V relay off of one of the HD supply connectors, which could supply mains power to the fan when when the computer is turned on. That way it would be automatically coming on when the comp is turned on.
February 12, 2003 11:13:12 PM

you could, via a modified mains plug... but bear in mind that fan will be recieving 240V... so you better be sure your wiring is done right so you odnt kill yourself or the computer!

some electrician could also do it risk free

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February 13, 2003 5:25:40 AM

An electriction is the LAST person I would go to. They dont know wnything other than basic house wiring usualy. Pulling apart a PSU is a different story to wiring up a house. You need to know what everything is and does in the PSU. I would suggest a TV Repairman. They could do it for you no problem.
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