Ono sto ti treba je nesto sto je i meni trebalo na forumu, a nisam znao za to tad. Zener dioda.
http://en.wikipedia.org/wiki/Zener_diode
"A Zener diode is a diode which allows current to flow in the forward direction in the same manner as an ideal diode, but also permits it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage, "zener knee voltage", "zener voltage", "avalanche point", or "peak inverse voltage"."
Kod potrosaca je fora da mozda mora da ide jos nesto pored ove diode (tipa tranzistor, ili relej) i koliko ce ti opteretiti akumulator, tj koliki je pad napona samo od prikacenog potrosaca. Zenerice imaju mnogo malu propusnu snagu, vrlo malo vati.
THE ONLY EASY DAY WAS YESTERDAY