Car Battery Charger

This charger quickly and easily charge most any lead acid battery. The charger delivers full current until the battery power falls to 150 mA. At this time, a lower voltage is applied to finish and avoid overload. When the battery is fully charged, the circuit is turned off and lights a LED, which indicates that the cycle has finished.

Schematic:

 

Parts:
R1 .................................. 500 Ohm 1/4W
R2 .................................. 3K,  1/4 W
R3 .................................. 1K 1/4 W
R4 .................................. 15 Ohm 1/4 W
R5 .................................. 230 Ohm, 1/4 W
R6 .................................. 15K, 1/4 W
R7 .................................. 0.2 Ohm, 10 W
C1 .................................. 0.1uF / 25V (ceramic capacitor)
C2 .................................. 1uF / 25V (electrolytic capacitor)
C3 .................................. 1nF / 25V (Ceramic Capacitor)
D1 .................................. 1N457
Q1 .................................. 2N2905 (PNP transistor)
U1 .................................. LM350 (regulator IC)
U2 .................................. LM301A (operational amplifier)
S1 .................................. Normally Open switch button (NO)
MISC ............................ Cable of the Board, the heat sink for U1, Case, Poles or crocodile clips for output

Notes:

1. The circuit was designed to be powered by a power source, so no transformer, rectifier, filter capacitors or the schematic. There is no reason why you can not add them.
2. A heat sink is required for U1.
3. To use the circuit, connected to a power supply / plug it in. Then connect the battery to charge to the output terminals. All you have to do now is push S1 (the "start" switch), and wait until the final circuit.
4. To use the charger without having to provide an external power source, use the following circuit.
   
   
    
   Parts:
   C1 .......................... 6800uF / 25V electrolytic Capacitor
   T1 ..........................  transformer 15V, 3A
   BR1 ........................ 50V 10A (rectifier bridge)
   S1 ........................... 5A SPST Switch
   F1 ........................... 250V, 4A 
5. The first time you use the circuit, you should check up on it from time to time to ensure it works properly and the battery is being over charged.Related Circuits