This circuit is a voltage reducer 24V to 12V with output current of 2.5 A, it can adapt in a various uses, it is suitable to be installed on a truck because of all the electrical circuits of car audio, radio and some other modern devices for cars require 12 volt supply voltage.
The use of this voltage reducer can also be expanded to the CB transmission / receiver, this is due to support of current 2.5 amps maximum.
LIST OF ELECTRONIC COMPONENTS:
All resistors are 1/4 watt unless otherwise specified.
R1 = 470 ohms 1 watt
C2 = 100uF16Velec.
DZ1 = 5 watt 13 volt zener.
T1 = 2N3055-BDW21C + heat sink