The circuit uses the widely available CD4066 biteral switch CMOS IC to indicate the water level through leds.
What this circuit should be doing is that, when the water is empty to wires in the tank are open circuited and the 180k resistors pulls the switch low hence opening the switch and LED's are off. As the water starts filling up first wire in the tank connected to S1 and the + supply are sharted by the water. This closes switch S1 and turn the led 1 ON. As the water continues to fill the tank, the led 2, 3 and light up gradually.
When the water is full the base of the transistor BC148 is pulled high by the water and it saturates the transistor, turning the buzzer ON. The SPST switch has to be opened to turn the buzzer off.
I have connected everything properly and used all the correct compenents for the circuit but apparently the circuit is not working.
What this circuit should be doing is that, when the water is empty to wires in the tank are open circuited and the 180k resistors pulls the switch low hence opening the switch and LED's are off. As the water starts filling up first wire in the tank connected to S1 and the + supply are sharted by the water. This closes switch S1 and turn the led 1 ON. As the water continues to fill the tank, the led 2, 3 and light up gradually.
When the water is full the base of the transistor BC148 is pulled high by the water and it saturates the transistor, turning the buzzer ON. The SPST switch has to be opened to turn the buzzer off.
I have connected everything properly and used all the correct compenents for the circuit but apparently the circuit is not working.