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Car Battery Charger
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Schematic design of Car battery charger
Part List :
Capacitors	Resistors
C1      =  0.1 μF / 25V Ceramic C2      =     1 μF  / 25V Electrolytic C3      = 1000 pF / 25V Ceramic Semiconductors U1       = LM350 (Heatsink required) U2       = LM301A Q1       = 2N2905 D1       = 1N547	R1    =   500 Ω ¼W R2    =    3K Ω ¼W R3    =    1K Ω ¼W  R4    =     15 Ω ¼W R5    =   230 Ω ¼W R6      = 15K Ω ¼W R7      =  0.2 Ω 10W Others S1       = Push button switch (Normally Open) MISC   = Wire, Board, Heatsink, Case, Binding               Posts or Alligator Clips for output
Notes
This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished. A heatsink will be needed for U1. To use the circuit, hook it up to a power supply/plug it in. Then, connect the battery to be charged to the output terminals. All you have to do now is push S1 (the "Start" switch), and wait for the circuit to finish. The first time you use the circuit, you should check up on it every once and a while to make sure that it is working properly and the battery is not being over charged. If you want to use the charger without having to provide an external power supply, use the following circuit.
Part List External power supply:
Capacitors	Others
C1      =  6800 μF / 25V Electrolytic Diodes BR1    = Bridge rectifier (50V/5A or 50V/10A)	T1       = Mains transformer              (220V Primary, 15V/3A Secondary) S1       = 5A SPST Switch F1       = 4A/250V Fuse

Source : Electronics Lab