3.7 Volt Battery Charger / 18650 Battery Charger
Mobile battery /18650 battery charger indicator
  • Parts List:- Transistor BC547
  • Resistor 1k , 220ohm, 10k Variable Resistor
  • Diode IN4007, LED Green & Red

Friends this is very simple circuit to indicate battery is full or empty. When Green led on it shows Battery is full and Red LED shows battery is empty. This is very simple circuit based on Transistor BC547

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