Unlike many boots, this battery charger continuously charges the maximum current, decreasing only near full battery voltage. In this case the full load current source, transformer / rectifier was 4.4A. It tapers to 4A 13.5V, 14.0V 3A, 2A 14.5V and 15.0V in 0A.
Simple Battery Charger Vehicle Circuit Diagram
Parts:
Resistors
R1 = 0.32R
R2 = 8.2R Capacitors
C1 = x 10,000 uF 63V
D1 = 1N4004
D2 = 1N4004
D3 = 1N4004
Q1 = MJ1504
IC REG = 7815
BR1 = 1N4004x4
B1 = 12 Volt Battery
TR 20 volts AC
R1 and R2 are as high power resistor 2W, 3W, 5W or higher. Q1 and IC requires a heatsink good. If they are mounted on the same heatsink and will decrease the circuit turns Q1 gets too hot.
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