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Simple 12 Volt Battery Charger Circuit

In this video, we are building a simple 12V battery charger using just a few basic electronic components. This charger is perfect for beginners who want to understand how AC is converted to DC and how a basic charging circuit works.

🔧 Components Used

Step Down Transformer (0-14V AC / 3A)

6A Diodes × 4 (Bridge Rectifier)

100µF / 25V Electrolytic Capacitor

0.01µF Ceramic Capacitor

1kΩ / 1W Resistor

LED Indicator

Wires, Battery Clips

⚡ What You Will Learn

✔️ How to convert AC voltage to DC using a bridge rectifier
✔️ How a smoothing capacitor works
✔️ How to assemble a basic 12V battery charger
✔️ Understanding LED indication and safety precautions
✔️ Charging 12V lead-acid batteries safely

🛠️ Circuit Overview

The circuit steps down 230V AC to 14V AC, rectifies it using four 6A diodes, smooths the output with capacitors, and provides DC voltage suitable for slow charging 12V batteries. An LED indicator shows when the charger is ON.

⚠️ Safety Tips

Always double-check wiring before plugging into AC mains

Use proper insulation and a fuse for safety

Never leave the charger connected to the battery for long periods without supervision

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