Where can I get cheap 12DC power supplies?

Jameco below has a lot of power supplies.

Try a computer vendor who takes trade-ins.

A non operative unit is usually very cheap and the Power supply may still be working.

You get 12 v. and lots of 5 v capability from a ATX machine.

Not a lab supply but reasonably well regulated

Poppa J

Sure, not a problem. Two requirements...

First the power supply will need a reasonable load to operate properly. I attach one of the connectors to an old disk drive that draws an amp or two of +5v and also an amp or two of +12v. Works well.

Second, one of the wires on the ATX connector needs to be connected to ground (also known as "common") to turn on the power supply. This wire is in the middle of the connector, and a ground is adjacent. The pin number is 14, and the wire is supposed to be green (and the ground black). I usually use a little pair of spring-closing tweezers to connect the two.

Here is the google "lucky" reference for a pinout diagram:

sdb

I wanted to use an ATX power supply to provide 12vdc to car radio in my house, but was told that it would not operate unless it was physically connected to a motherboard.

Is there a way to use it without it being connected to a motherboard?

be

Hi, I used a 12V lamp from a car (25 watt) or similar for the load on my power supply, used a cable tie to hold it on the inside of the case behind the vent slots.

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Thanks, Kiwi Pete.

still