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For the voltages here any used ATX power supply will work.

Instead of this box you could just clip the appropriate wires for the same effect.

What I really want is a variable voltage supply easily made from any old ATX PSU. As an amateur that would be an invaluable tool.

One gentleman has done a writeup on creating a variable supply from an ATX.

http://hackaday.com/2010/12/09/atx-psu-turned-into-an-adjust...

It might be a good starting point for a kit which doesn't require a modification of the power supply itself.

My suggestion is eBay. Back when hp meant something other than crappy computers and the good stuff wasn't called Agilent, hp made some very nice lab power supplies that can now be found for less than $50 on eBay.

I can't recommend any specifically simply because I have never seen a bad product come out of hp's Test & Instrumentation division. They're all good.

http://www.google.com/search?q=mastech+hy1803d&tbm=shop

Posted my thoughts regarding this supply elsewhere in the thread. Good reviews on Amazon too.