We hope this circuit will help you to understand the action of a Battery charger. Lot of people has no idea how simple it is. In this circuit we have used two diodes, one capacitor and a transformer. Ammeter is not necessary but it helps us to determine the charging level of the battery.
When you finish the circuit just connect the positive and negative wires to the battery terminals. Make sure to connect the positive wire to the positive terminal of the battery. When the charging is going on you can see 1 to three amps in the ammeter but when the charge is finish or the circuit is disconnected the reading should be zero.
We have used two diodes for full wave rectification and a capacitor is used for DC smoothing. Capacitor is not necessary but we recommend you to use the capacitor always.
The charging time will depend on the size of the transformer, means if we connect a big transformer that means battery gets a higher current ( more than 5A ). Incase if you want to use a higher current transformer use big diodes to pass the current accordingly.
