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L63, Water Level Indicator Type-2

This is a simple and very useful circuit to check the water level in a container or a Tank. It gives visual indication at three levels and when the tank is about to overflow then it gives audio alarm. This is a very economical and easy to build project. But please take the help of adults if you are not familiar with soldering iron.


  • 4 - Transistor SL100

  • 4 – Resistor 100 ohm

  • 3 – LEDs

  • 1 – Capacitor 100uf 16v

  • 1 – Piezo Buzzer

  • 1 – 9v Battery

  • Connection wires

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