If you've built a bench power supply using an old ATX power supply, you may feel limited by the choice of voltages. We'll show you how to expand your options by building an add-on variable voltage module for your ATX-based bench power supply.
Gather the materials required and construct the circuit from the circuit diagram. It would be a good idea to get the datasheet for the regulator from the manufacturers website.
Get some banana leads and connect the +12V and -12V outputs from your modded ATX supply and connect it to the input of your variable module. Use a multimeter to measure the output voltage.
Once you have built the circuit test it carefully and measure the output voltage. You should be able to vary the voltage from about 1.5V up to 22V by turning the variable resistor. If you are using the LM317 the output current will be restricted to 1.5A, if using the LM338K it should be slightly higher check the datasheet for exact information.
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