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Simple Car Battery Charger

Naveen P N

This very simple circuit uses a transformer ,two diodes , a capacitor and an ammeter.
To charge a battery just connect the + and – terminals of the circuit to the corresponding terminals of the battery.
When the battery is not charged, the ammeter reading shows 1-3 amps.
When the battery is fully charged the ammeter reads Zero or nearly zero, after which the battery should be removed from the
charger.
The circuit is a full wave rectifier using 2 diodes for rectification. The capacitor is used for smoothing.
I think the circuit works fine without the capacitor since the battery itself acts a BIG capacitor. But when you are using the
circuit to supply 12V (as a battery eliminator) the capacitor needs to be present.
Care should be taken NOT to reverse the + and – terminals while connecting it to the battery.

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  • Víctor Fernández

    Nice project, but i think the capacitor is to big and the diodes to small; if you pretend to drive 3-5 amp to charge a battery 1n4007 is not enough, i will say 1n5400 (3 amp diode) and the cap 100 or 200 uf to produce a pulse current