Working Principle of BJT Transistor with Water Level Circuit Example

In this video, I will explain the working principle of the liquid level indicator circuit, which is an example of a hobby electronic circuit that you can easily install on the breadboard, using only BJT transistor, LED and resistor. This example will be very useful in terms of understanding the working principle of the BJT Transistor for the new learners. This circuit is widely used as hobby electronic circuits. Towards the end of the lesson, I will show the simulation of this circuit on Proteus. By the end of this lesson, you will have a better understanding of both transistor's working principle and the use of Proteus.