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View Full Version : How do turn on a psu without hooking it up to a mobo?

smokafatty
03-24-2004, 03:32 PM
I have a little experiment involving a 350w pc psu, a 400w car amplifier, and a 18" subwoofer. :)

I just need to know how to rig up the psu so I can turn it on without having to use a mobo.

Thanks.
BlackDiamondJr
03-24-2004, 04:05 PM
All you need is a short jumper. Have a look here for instructions on how to power up an ATX power supply.................

http://www.gideontech.com/guides/psu_powerup/
smokafatty
03-24-2004, 05:48 PM
Thanks man, the experiment was a success! My entire apartment was rattling, I even knocked the clock off the wall downstairs :laugh:
emailrob
03-25-2004, 01:58 AM
phew, glad I'm not your neighbour m8
BlackDiamondJr
03-25-2004, 08:41 AM
Glad that I could help!!

18" subwoofer :insane: :insane: :insane:
nightheart
03-25-2004, 09:01 AM
The PSU in a PC is the "same" 12 volt set-up deal as a car battery right? So with a little tweeking you can get a PSU to power stuff designed to run off a car battery, right? A guy in the local shop told me this once, but I never had the sack to try anything out.

Sorry for jumping on your thread here, but I've been wondering this for awhile and your "experimient" seems to prove this.
richskie
03-25-2004, 11:36 AM
Just bear in mind that computer PSUs aren't designed to put out their full power rating on the 12V line. Most have a lable saying what current each line is rated at.
Littlejack
03-25-2004, 01:24 PM
The PSU in a PC is the "same" 12 volt set-up deal as a car battery right?

in the way that it is 12v dc yes, however, the current capabilities of a psu are much lower.
As stated above, check that the psu can supply enough current to power your new experiments first.

should your psu be labled in amps, and the current draw of your desired device is rated in watts, then devide the rated watts by the desired volts to give you the rated current in amps.
smokafatty
03-25-2004, 01:52 PM
True, the psu states 12A at 12VDC so thats only 144W, considering the sub is rated at 800W max you wouldn't think it could push it. But it seems to have plenty of power as I have the gain on the amp turned up less than half way.

Nightheart- I'm just using a cheap $20 pc psu. I used blackdiamondjr's tut above to rig up the psu, I had it bumping my stereo all yesterday and the psu didn't even heat up. Plus its alot cheaper than spending $100+ on a regular home ac/dc psu.