You can convert an old PC power supply. It has + and - 12V, + and - 5V, and
+3.5V. Do a google search for ATX power supply pinout. I use an old Dell
power supply as my bench supply. You have to put a 5W 8ohm resister on one
of the 5V leads and tywrap it to the case on the inside with heat sink
grease so it will stay turned on, they cut off automatically with no load.
You can even use the POST lead to power an LED letting you know its turned on.

At 05:24 AM 3/22/04, you wrote:
>Hello,
>
>I'm looking for a schematic for a dual 12V @ 3A, 5V @ 3A power supply
>with battery backup and charging circuit (eventually). I have searched
>the web and have found nothing similar (only for sale, but I need to
>build it myself).
>
>Does anyone have [seen] such a schematic and can share it with me ? :)
>
>Hoping for any help from you,
>
>Lucian

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