becouse obatin +3.3, +5 and +12 is so simple.
Instead for -12 and -5 i've ecountered some difficulties..
Sorry for my english! 😛
Instead for -12 and -5 i've ecountered some difficulties..
Sorry for my english! 😛
exactly.
+5,+12 and +3.3 are done.
But i've a lot of difficulties to obtain -5 and -12.
So i've asked if they're absolutely necessary!
+5,+12 and +3.3 are done.
But i've a lot of difficulties to obtain -5 and -12.
So i've asked if they're absolutely necessary!
Is this for a computer? There are alot of control systems involved in an ATX power supply such as the 5VSB, PS_ON and PWR_OK. There is quite a deal more involved than just the rails...
As for the -5V and -12V lines, to meet the official specification you must include these. The question then comes down to what exactly it is you wish to power with this supply and is it capable of running without the -5V and -12V lines.
As for the -5V and -12V lines, to meet the official specification you must include these. The question then comes down to what exactly it is you wish to power with this supply and is it capable of running without the -5V and -12V lines.
Yes.
I know but i8 would like to try anyway! 😛
in any case i will lose a motherboard and cpu that can value max 20€!🙂
is it capable of running without the -5V and -12V lines.
That's the problem! 😛
It will depend on the exact hardware configuration you wish to use (There is no simple yes or no answer. We need more information about the exact hardware you wish to use). Also, I made mention of those control systems because the computer will not even start if the control systems are not in place to provide the correct signals to the logic on the motherboard.
-5V isn’t used anymore, most computer PSU's don’t come with it at all. It was used on the old ISA bus but that is long gone
-12V is still used but only for serial ports and also is present on the PCI slot but most PCI cards don’t use this at all, so if you don’t use the serial ports it's safe to turf as well
-12V is still used but only for serial ports and also is present on the PCI slot but most PCI cards don’t use this at all, so if you don’t use the serial ports it's safe to turf as well
MaXiZ said:
For providing power, that circuit should probably be adequate even if not ideal. The whole point though is that you absolutely need the circuits that handle 5VSB, PS_ON and PWR_OK or you will never even be able to start the computer (and jerry-rigging those pins to "trick" the motherboard isn't really an acceptable solution).
5VSB is the 5V line that appears on it's own pin on the ATX connector. The 5VSB line has +5V on it at all times when the power supply is plugged into the wall even if the computer is turned off.
Jerry-rigging. I mean you actually need the logic to handle this not just to jumper these lines to the voltages the motherboard would expect when things are ok.
Jerry-rigging. I mean you actually need the logic to handle this not just to jumper these lines to the voltages the motherboard would expect when things are ok.
I'll make some experiments.
At max i'll lose a cup+motherboard with a volue of 20€!🙂
At max i'll lose a cup+motherboard with a volue of 20€!🙂
Why not? If i supply EXACTLY +12.00V,+5,00V and +3,3V at right current...
I think you need to read the official ATX12V 2.2 specs all the way through a couple of times so you can fully understand what those control lines do and the logic required for them.
http://www.formfactors.org/developer/specs/ATX12V_PSDG_2_2_public_br2.pdf
http://www.formfactors.org/developer/specs/ATX12V_PSDG_2_2_public_br2.pdf
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