This circuit looks relatively simple to build. I'm not going to bother with the transformer since I have a dc adapter. I was wondering how would I adapt this circuit to use a lm317 instead of a 7805. The maximum output is 1.5A. I presume I would need beefier transistors. However am unsure as the formulas at the bottom I never seen in my life. Could you point me in the right direction to understanding these formulas please? It's a 3.3v / 5v PSU selectable via SPDT switch.
The reason I'm using this circuit is because it has an short circuit led. It's useful to have.
Am actually following spark fun schematic for a 5v breadboard supply. However I want a short circuit led as well as a power led.