I'm using the Arduino Mega, 3 normal leds, GPS and Arduino GSM Shield.
I'm supplying this with the car cigarette lighter via VCC and GND (12v).
I imagine that it drains around 2 and 2.5A, but I would like to know if is ok or will burn the circuit?
What do you recommend ? When I use for long time I can feel the board a little bit warm.