Power Supply Current and Voltage Regulated By LM317 or LM350


Posted on Feb 6, 2014

In this circuit I have used a Rotary Switch to select Various Current ranges as a Potentiometer is not very practical for the lower resistance/High Current Ranges. But if you wish to change it to a pot, you can try it. * It is practical to use a pot on the lower current ranges so the lowest switch range could be a pot with a small series resistor.


Power Supply Current and Voltage Regulated By LM317 or LM350
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Allowing for adjustment from say 10 mA to 500 mA . Than use fixed resistors on the higher current ranges. I recommend in making two of these. This will allow for Plus and Minus  supply voltages, when needed. They can Also be Paralleled or placed in Series for Higher Currents or Higher Voltages, As is Sometimes Needed. Output Voltage and current depends somewhat on the transformer used, as well as which Regulator used. You have a choice of an LM317 for 1. 5 amps Max, or an LM350 to give about 3 amps Max.




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