PC power supply

littlerick · 7th January 2010, 09:12 PM

Couple of Questions about PC power supply, I have a 350 watt ATX PSU.

Can I use this power supply to test a lm4780 amp to see if its working ok. ie, wire +12v and -12v into amp without using rectifier board.

Can I use the power supply to actualy run a small amp (not my 4780), but maybe a chip that will run on 12v.

Leolo · 7th January 2010, 09:21 PM

ATX PSUs are switch-mode, aka very noisy. Also, the -12v rail is going to have much less current then the +12v. Something like 5 amps for the +12v but only 0.5 amps for -12v. Some PSUs will have current per-rail written on a sticker somewhere. If not, Google it or measure it.

Xoc1 · 7th January 2010, 09:21 PM

The negative supply is probably limited to a very low power rating compared with the positive 12V supply. Be careful to check the spec on the different voltage outputs you want to use.

7th January 2010, 09:12 PM	#1
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	PC power supply Couple of Questions about PC power supply, I have a 350 watt ATX PSU. Can I use this power supply to test a lm4780 amp to see if its working ok. ie, wire +12v and -12v into amp without using rectifier board. Can I use the power supply to actualy run a small amp (not my 4780), but maybe a chip that will run on 12v.

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7th January 2010, 09:21 PM	#2
Leolo diyAudio Member Join Date: Dec 2009 Location: Quebec	ATX PSUs are switch-mode, aka very noisy. Also, the -12v rail is going to have much less current then the +12v. Something like 5 amps for the +12v but only 0.5 amps for -12v. Some PSUs will have current per-rail written on a sticker somewhere. If not, Google it or measure it.

7th January 2010, 09:21 PM	#3
Xoc1 diyAudio Member Join Date: Nov 2008 Location: Devon UK	The negative supply is probably limited to a very low power rating compared with the positive 12V supply. Be careful to check the spec on the different voltage outputs you want to use.

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