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modding my power supply

S

stringcheeseincident

Gawd
Joined
Aug 7, 2003
Messages
807
i have a 300w atx powersupply i opened up today, i'm looking to replace the 80mm fan with a blue led fan. the only wires coming off the fan are red and black...i know the black is ground, is the red +12v? i have a few other fans with just red and black wires, a few also have a yellow line. what's the yellow? if the blue led fan i order has a yellow line, what am i supposed to do? we are friends with an electrician who i'm going to ask to help me splice the wires with my new fan. is that all i need to do? red to red, black to black? thanks.

also, who sells the cheapest and quietest blue LED fans?
 
Red is five volts, http://www.pcguide.com/ref/power/sup/partsDrive-c.html

Somehow you can get seven by using the +12v and the +5v, I dont understand the physics behind that so if anyone does please explain.

Just unplug / rip out your old fans wires and plug in / soder your new fan's wires.
The more voltage a fan gets the faster it spins, but im sure it will fry if given too much.

BTW: most (if not all) 80mm fans use 12v's most people use 5v or 7v to make em quiet.
 
Simple way of looking at it:

Yellow supplies 12 volts which goes to the fan and then goes to ground (0v). 12 - 0 is 12.

If you use the 12 volt yellow wire to supply the voltage and use the 5 volt red wire as "ground," then you have 12 - 5 which is 7 volts which actually runs through the fan.

If someone wants to go in to more detail, feel free. I just don't want to explain it all.
 
i have one fan inside mine, it says its +12v on the label, but it has only one red wire going to it, and one black. does that mean its running at 5v? again, if i buy a fan that also has a yellow wire, is it bad to snip the yellow wire off, tape the end, and just let it be? i will ask the electrician to solder the new fan on.
 
Check that guide I linked too, the 12v thing just means that it has the little plug needed for P4 boards and some AMD boards. I have the same model PSU I think (it's an Antec 300w).
 
Fans, red = 12v, black = ground, yellow = rpm monitoring.

External PSU connections (4 pin molex), red = 5v, yellow = 12v, black = ground.

Inside the PSU snip red/black wires to the existing fan, just hook red to red, black to black, snip and insulate the yellow wire, and let it hang.
If you want to have it run @ 7v for quieter operation, you have to hook it up different, find the leads for the molex connectors, hook yellow from the molex lead to red on the fan, and red from the molex lead to black on the fan.

And for the love of god, REMEMBER TO INSULATE THE BARE WIRES! :D
 
super_stoner said:
Fans, red = 12v, black = ground, yellow = rpm monitoring.

External PSU connections (4 pin molex), red = 5v, yellow = 12v, black = ground.

Inside the PSU snip red/black wires to the existing fan, just hook red to red, black to black, snip and insulate the yellow wire, and let it hang.
If you want to have it run @ 7v for quieter operation, you have to hook it up different, find the leads for the molex connectors, hook yellow from the molex lead to red on the fan, and red from the molex lead to black on the fan.

And for the love of god, REMEMBER TO INSULATE THE BARE WIRES! :D
Click to expand...

exactly what i wanted, thank you, i'll post once i get this done.
 
ErrOnReq said:
Simple way of looking at it:

Yellow supplies 12 volts which goes to the fan and then goes to ground (0v). 12 - 0 is 12.

If you use the 12 volt yellow wire to supply the voltage and use the 5 volt red wire as "ground," then you have 12 - 5 which is 7 volts which actually runs through the fan.

If someone wants to go in to more detail, feel free. I just don't want to explain it all.
Click to expand...

So the electrons flowing in the opposite direction in the +5volt line act as a resisting force? And for any DC experts, what exactly constitutes as a ground. For example, why would a car body be a sufficient ground and a paperclip not? (maybe I should just wait for my phys 1404 class, deals with tons of electric properties)
 
stringcheeseincident said:
i have a 300w atx powersupply i opened up today, i'm looking to replace the 80mm fan with a blue led fan. the only wires coming off the fan are red and black...i know the black is ground, is the red +12v? i have a few other fans with just red and black wires, a few also have a yellow line. what's the yellow? if the blue led fan i order has a yellow line, what am i supposed to do? we are friends with an electrician who i'm going to ask to help me splice the wires with my new fan. is that all i need to do? red to red, black to black? thanks.

also, who sells the cheapest and quietest blue LED fans?
Click to expand...
alrite, your taking the same road i took... just follow my footsteps

first of all, IN the psu, the black wire is ground and red most likely is 12v... on the LED fan, you can screw the yellow sensor wire.... take the black (ground) wire of the LED fan, splice it to the ground in the psu, take the red (12v) wire of the LED fan and splice it to the red wire in the psu... cut off as much of the yellow rpm sensor wire as possible... *note-some fans use differnt colors and usually ground is black while 12v is red...

as for a place to buy cheapest and quietest blue LED fans, i ve bought a couple from xoxide... buy the xoxide ones, they're cheap and are barely audible... although they are not efficient since they do not move ambient air but you can always add a fan in the back to push it which is exactly what i did... i didnt use the xoxide LED fan in my psu, i used a cooler master green fan which is very efficient and moves a good amount of air... i picked that up at newegg in mass with discount for it for like 4 or 5 bucks

if you want some guidance, IM me at bladderoverclock and i can try to find some time to reopen up my modded psu to show you how i did it

good luck
 
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