The Simplest Car Battery Charger


Posted on Dec 7, 2012

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 Simplest Car Battery Charger
Click here to download the full size of the above Circuit.

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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