Simple 12 volt Battery Charger Circuit Diagram

Last Updated on March 16, 2024

Simple 12 volt battery charger circuit diagram designed by using few easily available components, and this circuit is suitable for different types of batteries needs 12 Volt. You can use this circuit to charge 12V SLA battery or 12V Gel cell battery and so on. This circuit is designed to provide charging current upto 3 amps and this circuit don’t have reverse polarity protection or over current protection so kindly test this circuit before stepping into battery charging.

This Simple 12 volt Battery Charger Circuit Diagram gives you a outline design for the general battery charger and you can add additional features to this circuit like reverse polarity protection by placing a diode at the output. (Diode anode to output positive supply and diode cathode as output positive terminal) and over current protection setup using transistors. The following charger circuit just a Raw prototype to give 12 Volt output to battery.

Circuit Diagram

Components Required

  1. Step down transformer (0-14V AC / 3 Amps) – Choose depends on your requirements.
  2. Bridge Rectifier module BR1010
  3. Capacitors 0.01µF, 100µF/25V each one
  4. Resistor 1KΩ (Use 0.25W for normal LED)
  5. LED

Construction & Working

Use Required ampere Step down transformer for your target battery, here we have used 0-14V AC / 3 Amps Step down transformer and for AC to DC rectification we have used Bridge Rectifier module BR1010 which gives High efficient DC supply with high Current rating.


This Bridge Rectifier module will have four terminals, two for AC supply input noted with sign wave and two terminals for DC output noted with positive and negative sign.

C1 and C2 capacitors are performing as filter in this circuit then LED indicates the presence of DC power supply at the output. Connect the target Battery at the output to get charged.

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