Hey all, I have a question on the LM317. I'm putting one in an aluminum project box and would like to use the actual box as the heat sink. As I undertand it from the data sheet, the heat sink on the lm317 (TO-220 packaging) is connected to the output pin. So I'd effectively be applying my output voltage to the project box. why the hell do they tie the heat sink to the output pin and how can I insulate it so I dont have a voltage potential on the project box? thanks!