This very simple circuit uses a transformer ,two diodes , a capacitor and an ammeter.To charge a battery just connect the plus and minus 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.
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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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