Power Supply +13.8V 5A with LM338
This ac to dc power supply can output 5A in continous operation and 12A peak current. This kind of dc power supplies uses a PCB so you can use two case types for IC1, TO-220 or TO-3. The regulation of this 12 volt power supply is made with TR1 ( multiturn ). IC1 must be placed on proper heatsink.
LM338 Power supply circuit diagram
13.8V low voltage transformer components :
R1=270R 1/4W 2%
C4-5=10uF 25V
T1=220Vac/15VAC – 8A Mains Transformer
TR1=4k7 (Multiturn)
D1-2=1N4002 (1A/100V)
S1=2 Pole Single Throw Mains Switch
C1=10000uF 40V
C2-3=100 nF 100V Polyester
B1=25A Bridge Rectifier
F1=250mA Fuse
IC1= LM338
More power supply circuits …
about 9 months ago
Primary fuse rating too low . VA rating is 120 at output , input nearly same , therefore 120VA / 240V is 500mA plus more for transient , spikes & whatever . Try 750mA or 1A
about 9 months ago
Thanks for the info. Everybody else, try to build this power supply with 1A fuse.