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Double psu project

Krazy Owl

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#1
I dont know if someone crazy here did it already but did ever one of you took 2 psu same model and connected all wires together to double the power ?
 

Bunchies

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#2

Krazy Owl

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#3
It's simple i think its just a remote that act like if you plug a staple between the green and black on the 24 pins
 
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Krazy Owl

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#5
Yes mostly :)
I want to build a wooden box shaped like an old speaker box from the 80's with full computer inside. 2 psu one for the computer ... the other one to give amps to a car radio i will put inside bolted to the face.
Also a rectangle to bolt in front a flat screen of 17 inches, 3 ways speakers and buttons and usb audio front panels.
 
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#6
but if you gonna put dual psu its better like 1 psu for board and 2nd psu for vga card or other peripherals

Note: this method only allows you to run two psu's in one case as separate units, if you need more current I suggest you use matching power supply's that support dual psu's and link the 12v lines each psu together, same with the 5 volt lines, this way you will get more current if you need it. basically connect everything pin to pin from each atx socket
***WARNING*** connecting two power supplies together may cause serious damage to the power supplies and the equipment that they are connected to.

The master/slave setups illustrated in this thread should be okay. But, connecting two power supplies so that their regulated voltages are connected to each other, is BAD.

Background) Most power supplies use one circuit to power one transformer to make all of the various output voltages. Then, one output voltage (usually the +5Vdc) feeds back to tell the input side of the transformer what to do. The other output voltages are controlled by their relationship to the feedback voltage. (They come off the same transformer using different windings) [very over-simplified] So, the input side of the power supply regulates itself to make the regulated voltage come out right; and the other voltages drift according to what is happening to the regulated voltage.

Problem) If the two different power supply regulated voltages are connected to each other, they will make the power supplies unstable.

Lets say PSU 1 regulates it's +5 line to +5.015 volts. Let's say PSU 2 regulates it's +5 line to +5.013 volts. If the two regulated voltages are spliced together, PSU 1 will pull all the load off PSU 2 by pushing the +5V to +5.015 vdc. It's other voltages (+12V, -5 V, -12V and +3.3V) will go high. PSU 2 will reduce it's output to bring the +5V down to +5.013 vdc. PSU 2's other voltages will also go low. The motherboard and other devices will be caught in the middle of the conflict.

Real power supply sharing systems use extra circuits to prevent PSU 1 from affecting PSU 2 and vice versa.
 

Krazy Owl

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#7
I will only plug the green and black together. So its switchng only for starting.
 

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#8

Krazy Owl

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#9
I will not pay 20$ plus shipping for some connections i can do myself hehe
 
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#10
That's the spirit, why pay more for something you can do with the pride that you get when you know you've done it yourself?
 

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#11
connecting then together is never a good idea. however feel free to power differnet components with it.
 

OneMoar

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#12
connecting then together is never a good idea. however feel free to power differnet components with it.
all he needs todo is connect and Green and black wires to tell the psu to switch On there is absolutely no possible way it can cause any harm
I would't recommend splicing the hot wires together but then again so long is everything is on the same ground and there the same model psu I don't see why that would hurt its not gonna provide any Advantage but its not gonna kill anything if done correctly
 
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#13
What you can do, is if you are in need of a new power board, get one of the Master/Slave ones, which means, if the master plug is drawing power, all the other slave plugs on the power board get power. Then you can just permanently jump the bridge of the 2nd PSU, put it in the slave plug of the power board. Then when the main PSU turns on, the second one turns on a the same time. Obviously this is only economical if you are in need of a new powerboard.
 
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#14
i did this kind of thing back in the olden days before there were kilowatt PSUs. it really is very simple and relatively harmless.