I decided to drop to 10.5v, which means that I will only be drawing ~1.3A (ammeter shows 1.2ish but I want to go a bit higher just to be safe). Ive found an old AT power supply from a computer, so would I be able to use an LM317T to drop the 12v rail to 10.5v? They are supposed to be able to handle 1.5A, so it makes sense to me that it can handle 1.2A. If my logic is off can you please explain, or confirm that it will work (before I go blowing things up)? And yes, I know Im likely going to need a heatsink, that shouldnt be an issue.
EDIT or is there a simpler way to drop the voltage? Maybe by modifying something inside the PSU? I originally thought of a voltage divider but I dont have any resistors rated at a high enough power (P = VI = 10.5*1.2 = 12.6w)