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Dear Sir. You will need the following: 1) a transformer capable converting the supply voltage to ±15-18 V AC , 300 VA,± 15 Amps at the secondary side. 2) an ordanary rectifier circuit-AC to DC
Do not listen this comments about using 7812 and transistors. a car battery requires a lot of power, the mentioned components will burn in hell. What you need is a transformer and a rectifier which depends in the kind of transformer you have. use high amperage diodes.
You will definitely need power transformer (mains voltage)/15V ac. , a bridge rectifier, a shunt operated current regulating and booster circuit, a voltage regulator.
A 7812 reg. will give max. of 500mA output. You may boost this output and with transistor or FETs to give more charging amps up to 10A. You will need a volt regulating circuit after the rectifier in case you connect a fully discharge battery across your charger to bring up the charge. You will also need to regulate this for trickle charging for long period connection.
Don't forget to put ammeter/voltmeter to know what is goin' on.
Hope this help.
Good luck.
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