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Converting PC computer power supplies for 12, 5, or 3vdc needs


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After seeing quite a few posts from those looking for 12 and 5vdc power to run lights, servos or props, I thot I'd post these links for converting old pc supplies for bench use.

Most pc supplies from 10-15yrs ago and before, were the AT variety, supplied enough voltage and current to run the board, (usaully) a single hard drive, maybe a CDROM and a cooling fan.. not much more than 5-10A req'd at startup.. Now, with multiple drives, both hard and optical being the norm, mega-giga-tera-quadra-lotta-video cards and processors being "entry-level" now, many pc supplies that came with computers just a short time ago arent enough to keep thing powered, or cool..

With these supplies being upgraded, the old ones are being discarded, or dumped, while still being able to power lower power/current requirement items.. servos, lights, small motors, etc.

Wallwarts, while fine for running phones, or tape players, usually have about an amp or so max current rating, with some just above 2amps. They can be found just about anywhere, from your kitchen drawer from that old phone, to boxes in the garage for that lost cd player, to Goodwill/DAV, yard sales, etc..

If a need for 12, 5 or 3v clean regulated dc is needed, the best thing to use are pc supplies. With some small mods, they can be used to run a number of items, cleanly, cheaply, and safely.

I use 4 to power my halloween projects, r/c servos in my 14 talking skeletons. Here are couple to look over. The MSU project (2) was the one I patterned mine after..

Link 1: http://www.scary-terry.com/atxps/atxps.htm

Link 2: http://web2.murraystate.edu/andy.batts/ps/powersupply.htm

Link 3: http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply

'not trying to steer anyone away from ww's, just seems there's a better alternative for higher voltage/current needed. If you need 9vdc, then ww's are prob the better way to go unless you use a pc supply and drop the voltage with high current resistors..

TJ

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