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Old 31st January 2012, 11:08 PM   #1
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Default 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.

-Thanks
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Old 2nd February 2012, 08:43 PM   #2
effebi is offline effebi  Italy
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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...
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Old 2nd February 2012, 10:06 PM   #3
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I need a couple of amps... what do you recommend?

-Thanks for you help
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Old 3rd February 2012, 12:52 AM   #4
! is offline !  United States
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^ using a different power supply
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Old 3rd February 2012, 07:26 PM   #5
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Or you can use a buck-boost converter to transform +5V into -5V. The +5V output from PC power supplies is usually quite bold.
Emerson
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