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.

Components-

• 4 - Transistor SL100

• 4 – Resistor 100 ohm

• 3 – LEDs

• 1 – Capacitor 100uf 16v

• 1 – Piezo Buzzer

• 1 – 9v Battery

• Connection wires