Simple Battery Charger DIY Electronics Project

3D Animation Tech

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00:00Very simple 4.2 volt battery charging circuit. It can accurately charge and indicate the status.

00:06The circuitry is very simple. Take a NPN transistor, a 47 ohms resistor and Zener diode for constant voltage.

00:14A pair of red and green LED is used to indicate the charging status.

00:18This TL431 can control the LED light on and off.

00:23680 ohm resistance and 1000 ohm resistance.

00:28Finally, connect the input to the USB plug and output to battery socket.

00:33You can charge a single battery with this circuit.

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