Build-in charger for instruments powered single Li-ion or Li-pol accumulator. If external charge voltage not conected to charger, back current from accu to charger is very small (not measured ordinary multimeters)

This is circuit Regulator 5V 3A by IC LA5105. (easy circuit)
To use transformer 4A. IC to Hold Heatsink.
For Digital circuit.

Circuit High power supply regulater 0-30V 20A by LM338
This is High current and Adjustable Volt 0 to 30V 20A.
It easy circuit and nice circuit, Because use IC LM338 and IC 741.
Volt Output adj by VR1-1K.
IC LM338 to hold heat-sink. Transformer is 20A up.

R1a = 2,2 K
R1b =470 Ohm
R2 = 10 K
R3, R7 = 3.3 k
R4 = 390 Ohm
R5 = 47 K
R6 = 3.3 K 1Watt
R8 = 180 Ohm
R9, R10 = 0.47 Ohm 3Watt
R11 = 0.075 Ohm 2Watt
R12 = 470 Ohm
P1 = 500K liner potentiometer
P2 = 4.7 K potentiometer
P3 = 10 K potentiometer
C1 = 1nF
C2 = 10nF
C3 = [...]

R1=10Mohms
C4=10uF 16V
IC2=4013

R2=100ohms
C5=47uF 16V
IC3=4047

R3=1.2Kohms
C6=470nF 400V
CR1=3.2768 MHZ crystal

R4=560Kohms
D1=5V6 0.4W
T1=220Vac/2X10V 2X2.2A *see text

R5-6=2.2Kohms
D2-3=47V 1W
F1=5A Fuse

R7-8=56 ohms 5W
Q1-2=BS170
F2=0.25A Fuse

CX=22pF trimmed capacitor
Q3-4=BD139
L1=1H smoothing choke

C1-2=22pF ceramic
Q5-6=BD249

C3=8.2nF 100V MKT
IC1=4060

Many times we needed one relatively powerful supply in order to we supply various appliances with + 13.8V, as transceivers CB, charge lead-acid batteries, etc. The circuit it uses known completed that is capable gives in the his exit, current in continuous [...]