The 1A regulator on the UNO can actually do 1A under very specific conditions.
At Raw pin I was powering only the electronics on the Arduino board and from 5V pin the HC-12 receiver module.
So, in this case I should take down the 12V to around 5V to power the Arduino to make sure no smoke will be seen again. Right?
Should I have different regulator modules for modules and Arduino?
So far I understand that I need to have a regulated 5V minimum 4A (stall current on turn motor) power supply and have to run wiring in a star configuration from 5V PS to everything Mot1, Mot2, HC-12 and Arduino.
I will put some 16V capacitor to the power lines for motors and a smaller one maybe 1uF for HC-12.
Please don't use "mf" for millifarad. (1mF == 1000uF) It's use is uncommon because "m" used to be used for "micro", especially on caps.