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Fan 24V overvolt!

post #1 of 59
Thread Starter 
Just tried out this mod on an old jump started PSU and a stock AMD heatsink fan.>

http://www.afrotechmods.com/fanmod.htm

The fan was literally trying to take off!!! But I saw a few puffs of smoke coming out of it when I used 24 volts! 17 volts works rather well though as does 15.

Give it a go with some old fans! Turn a 49p fan into a 50 quid delta!

EDIT: Special thanks to metalmodman

Quote:
Originally Posted by metalmodman View Post
ok heres a fail proof diagram.



please update your post

Thank you
    
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post #2 of 59
Fun stuff

My dad was telling me about when he used to take small motors, like 3-5v, and hook them to a car battery and run. They would literally explode
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post #3 of 59
Thread Starter 
:O I jsut accidentally shorted out the 12V and ground wires on the molex connectors! Nasty pop and a blue spark. Me very scared. Me like alot
    
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post #4 of 59
I had a 120mm 135CFM nidec fan. It has three massive blades and was pretty insane at 12V. My friend brought 4 9V batteries and some paper clips to school. The fan worked fine at 27V (3 batteries) and was putting out most likely 250+ CFM. I tried all 4 batteries, 36 volts, and it smoked and died lol.
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post #5 of 59
Wow I never knew you could get 24v off a standard ps... Is it safe for the powersupply?
    
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post #6 of 59
hehe i remember when i was 8 or 9 wiring a scalextric car to the mains.
lasted about 1/billionth of a sec - white flash - me near coronary lol
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post #7 of 59
is it possible to get like 48v off a standard powersupply?
    
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post #8 of 59
Thread Starter 
Quote:
Originally Posted by Chosen View Post
is it possible to get like 48v off a standard powersupply?
Nah..well, with hardware modding, yes probably. To get 24V you connect one terminal of the fan to the 12V rail and the other end of the the fan to the -12V rail. Total Potentail Difference (Voltage) = 12 - (-12) = 12+12= 24V

You need to use the power off of the atx connector to get -12V though. It doesnt go through the Molex connectors. As far as Im aware, it doesnt damage the PSU, only the fan You might blow a fuse in the PSU tho.
    
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post #9 of 59
Is there anyway to do this mod without using the atx power connector because if your doing this to the power connector your can't power the MoBo.
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post #10 of 59
Thread Starter 
Quote:
Originally Posted by Wincet View Post
Is there anyway to do this mod without using the atx power connector because if your doing this to the power connector your can't power the MoBo.
You can slide a wire in through the top of the ATX connector and make contact that way to the -12V or -5V connector.
    
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