at to atx power supple

[jak]

anyone have any idea if i can take a working at power supply, splice it with some parts from a fried atx power supply and get it running on a atx powered mobo??

[Omardeth]

you can get good cheap atx power supplies , why would you risk frying your system doing this ?

[jak]

basically because im sitting at home bored, not much cash and just want to start a project

[Omardeth]

i don't think it is what ya wanna do . you might mess up the motherboard because the at complience is different than atx . so i think it delivers the power different which may hurt you motherboard .

[DanU]

No

AT power suplies don't generate 3.3V. They also can't be turned off via software like ATX power suplies can.

[bailey]

there is a work around for anything
you can install a seperate switch to power on and off

you thinking of useing a atx supply in a at system right

then you need to redo the power connectore for the new supply and not use the connections that are not needed.
for the good power detect on the atx supply just pick it off the 5 volt rail with a small value resistor.
I don't see any reason that it wouldn't work, but sure would be a waste of time

the hardest part would be mounting it

[Bovon]

The ATX power supply is quite different from an AT.

Besides the AT not supplying the correct voltages, there is a 5 volt circuit in all ATX supplies that is never off...unless there is a master switch between the PSU and the wall socket..or the computer is disconnected from the power source.

This 5 volt circuit is what turns on the main power supply..it like two power supplies in one housing.

An ATX supply is not designed to be turned on/off with a switch...and would require considerable re-engineering and mods to make it work.

The 3.3 volts used in an ATA supply could possibly be derived from the 5 volt rail in an AT supply, but it would not be regulated..and would create problems in the computer system because of varying voltages (non regulated output).

[bailey]

ok maybe I read it wrong
I thought you wanted to use a atx supply in a at system

but useing a at supply in a atx system is impossible
first it will not have enough wattage to power up anything.
sorry if I mislead you on this

most at supplies are less that 200 watts

[jak]

hey its cool i understand that it cant be done, o well it will be put off until another day, but yea actually all i need is like a 120watt at the most im powering a epia board for this