I'm using a 21V DC wall adapter to supply me with 5, 9, & 12 volt regulated supply. Attached is the circuit I made. It's designed to switch between whichever voltage I want/require by means of an SPST switch. The LEDs are there for indicating on/off. My concern with this was to have them before the regulators as to not take away any voltage or current from the 78xx. Thoughts and suggestions are highly encouraged and recommended.
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