How to Make Wireless Battery Charging System at Home | BD139 BD140 | DIY project

In this video, you will learn how to make a wireless battery charging system using BD139 and BD140 transistors step by step.
This DIY electronics project demonstrates wireless power transfer using a 30-0-30 toroid transformer, transmitter and receiver coils, and a TP4056 charging module to safely charge a 3.7V lithium battery.
This project is ideal for electronics students, beginners, and hobbyists who want to understand wireless charging technology without using Arduino or microcontrollers.
🔧 Components Used
BD139 Transistor
BD140 Transistor
2 × 1K Resistors
2 × 104 Capacitors
2 × 105J 400V Capacitors
30-0-30 Toroid Core
2 × 20 Turns (28 AWG) Coil
Coil Radius: 2 cm
TP4056 Charging Module
3.7V Li-ion Battery
📌 What You Will Learn
✔ How wireless charging works
✔ Transmitter & receiver coil design
✔ Wireless power transfer using transistors
✔ Safe charging of Li-ion battery using TP4056
✔ Practical DIY wireless charger circuit
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