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Automatic 12V Lead Acid Battery Charger

Automatic 12V Lead Acid Battery Charger

This charger will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge.
If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged

Part Total Qty. Description Substitutions

R1, R3 2 330 Ohm 1/4W Resistor
R2 1 100 Ohm 1/4W Pot
R4, R5, R7, R8 4 82 Ohm 2W Resistor
R6 1 100 Ohm 1/4W Resistor
R9 1 1K 1/4W Resistor
C1 1 220uF 25V Electrolytic Capacitor
D1 1 P600 Diode Any 50V 5A or greater rectifier diode
D2 1 1N4004 Diode 1N4002, 1N4007
D3 1 5.6V Zener Diode
D4 1 LED (Red, Green or Yellow)
Q1 1 BT136 TRIAC
Q2 1 BRX49 SCR
T1 1 12V 4A Transformer
F1 1 3A Fuse S1 1 SPST Switch, 120VAC 5A
MISC 1 Wire, Board, Heatsink For U1, Case, Binding Posts or Alligator Clips For Output, Fuse Holder

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