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fabriciom 31st January 2012 10:08 PM

Getting -5 V from ATX PSU?
Hello, sorry if this is not the right place to ask. But I want to know if is farly easy to get -5v from an 400w ATX PSU.


effebi 2nd February 2012 07:43 PM

well,it depends on how much current you want. I you need Amps, forget the easy way.
If you need just a few mA, there is somewhre a -12V output that was used to supply the serial ports and such. It should still be there, I mean.
Then with a simple linear regulator , i.e 7905 (or even a zener if the ccurrent drawn is small and constant) there you are...

fabriciom 2nd February 2012 09:06 PM

I need a couple of amps... what do you recommend?

-Thanks for you help

! 2nd February 2012 11:52 PM

^ using a different power supply

Emerson Prado 3rd February 2012 06:26 PM

Or you can use a buck-boost converter to transform +5V into -5V. The +5V output from PC power supplies is usually quite bold.

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