LM317-based high-current adjustable power supply
In this video, I discuss a few things about the LM317-based high-current adjustable power supply. This circuit is the exact same circuit that you can find in the datasheet of the LM317 in the 9.3.12 section. My ultimate goal is to precisely control the current of Peltier coolers, so I started to discover other power supply solutions. This is not an efficient power supply, linear power supplies have never been efficient. There is a lot of heat dissipation. However, I wanted to understand this concept, so I built this circuit. If you want to have an efficient (but more complex) circuit, you should look at the switch-mode power supplies (SMPS).
Schematics and 3D image of the PCB
Copy of the high-current adjustable regulator circuit from the datasheet of the LM317
3d image of the PCB.
Parts list
LM317 voltage regulator (requires heatsink)
TIP35C NPN power transistor (requires a large heatsink)
2N2905 PNP transistor
2 pcs 10 uF 50 V capacitor
47 uf 50 V capacitor
1N4002 diode
22R, 120R, 500R, 5k resistor
5k or 10k potentiometer
