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How to use a common atx computer power supply to get 12 volts dc?
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somunny:
Here's the tutorial I used:

Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply
steveh:
that is a nice site.  Bookmarked for future use.  Thx
michelevit:
thanks for the replies. that was exactly what i was hoping to do.
i am planning on using the 12 volts to fire up the trackball light,
marquee backlight, cabinet cooling fan, and small car amplifier for
the speakers.

thanks again for all the help. i've got several surplus atx power supplies
that i can use.
leapinlew:
Sounds like you got the info you needed, but just for some other options I've used older AT style PSU's which have a hardware on/off switch.

I've also used wallwarts that output to 12v.

Out of all the solutions - I'd use a wallwart again. Easy and I have plenty of them.
ChadTower:

That ---smurfing--- rocks.  Awesome.
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