ATX type switching power supplies which have been removed from redundant computers can be easily modified to provide useful +/-5V and +/-12V ( also not so useful +3.3V ) DC fan-cooled bench supplies delivering around 300 watts in total. Voltage regulation of all rails is controlled by the regulation of the +5V rail, which needs to be permanently loaded with a resistor of about 10 Ohms rated at 3 to 5 watts. The power unit I am modifying is almost complete; just needs some nice red and black output terminals to be fitted and then it's ready to take its place on the workbench.
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