Attached is a schematic for a step adjustable voltage regulator using a LM317T. There are two parallel inputs and two parallel outputs. The idea is to enable the desired voltage by selecting the appropriate resistor with a shorting clip. The voltage choices are 3.3v, 5v, 6v, 9v, and 12v. The LED is just to show that there is voltage out; the current limiting resistor value will be selected to provide operation at 12v with the expectation that the LED will light more dimly at lower voltages.
I have not prototyped this circuit and would appreciate comments and corrections.
I have not prototyped this circuit and would appreciate comments and corrections.
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