LM317T Voltage Regulator with Pass Transistor

A DIY multi-voltage power supply I built the other week. Standard +/- 12, 9, and 5 but with a variable output for mimicking a single AA, or two in series. Not current limited though, that seemed too far for a first try. It might be worth altering the +9V though so it can also mimic a partially drained battery, to confirm performance in things like guitar effects pedals. If I was doing it again, I'd use a transformer with higher current supply, and make two +/- outputs, both variable, using the LM317 regulator instead. That would cover pretty much everything, and be simpler to build. Oh well :) !



http://www.youtube.com/watch?v=aE29WX6PYQM&hl=en