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.
