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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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