LM317 is one of the most popular adjustable regulator chips. The output voltage of the regulator can be adjusted from 1.25V to 35V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. In this article/video, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors.
You could have shown much better voltage regulation under load if You would have used real wires and not this flimsy breadboard connectors and wires. Even if these are only a few centimeters long, at 3 amps You have a relevant resistance through this wires and the breadboard contacts.
I just took the time and soldered the few parts with thicker wire (something like AWG16). Using a 2.2Ω load at 7Volt the output voltage dropped only 2 millivolt.
You could have shown much better voltage regulation under load if You would have used real wires and not this flimsy breadboard connectors and wires. Even if these are only a few centimeters long, at 3 amps You have a relevant resistance through this wires and the breadboard contacts.
I just took the time and soldered the few parts with thicker wire (something like AWG16). Using a 2.2Ω load at 7Volt the output voltage dropped only 2 millivolt.