This power supply circuit has maximum current 14 Ampere with output voltage 13.8 volt trimmed by P1. Remember to isolate the transistors from the chassis/radiator of power supply box! This is very important!
To prevent overheat of power supply heatsink, use a radiator (heat sink) of appropriate size and surface area; insulating and heat-conducting spacer or at least a thin mica; hot adhesive and thermal paste.
Just to be sure to prevent HF entering (or going back to the mains - power supply circuit) use a ring core to turn the mains a few times around it (see insides pics).
Parts list :
2 x 15 volt 6+ amps
2 times two MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 times 3 1N5401 1N5408) diodes.
F1= 1 Amp
F2= 15 amp
R1= 2k2 1 Watt
R2= 10k
R3= 1k 0.5 watt
R4,R5,R6,R7= 0.1 ohm 10 watt
R8= 4.7
R9= 6k8
C1= two times 4700uF/35v
C2= 330uF/35v
C0',C3,C4,C6,C10= 100nF
C7= 330uF/25v
C8= 47nF
C9= 47uF/25v
D1= 1N5401
D2= LED
D3, D4, D5= 1N4001
IC1= 78L15
Relay 12 volt 2x5 amp switching
3 darlington transistors: T0,T1,T2 = BDX-33 NPN TO-220 transistor
Zd= 8 or 9 volt, 5 watt
P1= 2k trimmer
If using a bridge rectifier (like in schematic 2) you do not need 2 x 15 volts 6 amps, but 1 x 15 volt 10+ Amps
See more 13,8 Volt 12A Power Supply - Regulated Power Supply 0-18V 4 Ampere
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