SIMPLE WATER TANK OVERFLOW ALARM CIRCUIT

"WATER IS PRECIOUS, SAVE EVERY DROP"

No Living Beings exist without Water.

So we have to save water in any way that we can.

A considerable amount of water will be lost everyday, during the refilling of water tank by overflowing it in our home.

We can avoid this, if you have a little knowledge with Electronics.

I am introducing the following simple circuit which consists of only 3 Transistors (Commonly Available) and a melody generating IC UM66.

You can replace UM66 with any alarm generating IC according to your convenience.

CIRCUIT DIAGRAM OF WATER TANK OVERFLOW ALARM

Mount this circuit on PCB or a breadboard.



CIRCUIT EXPLANATION



The transistors Q1 and Q2 forms a "Darlington Pair" , in which when a high resistance appears across the input it will trigger and producing an output Voltage.
This Voltage is used to switch the alarm circuit consisting of UM66.

The transistor Q3 will amplify the melody sound produced by UM66 IC and it will drive the speaker.


Note:-

Try to reduce the length of Probe, used to link with water tank.

The circuit is powered by a 9V Battery.

Transistors Q1 and Q3 may be any of the Common NPN type.

You can try our another projects with the same Circuit Diagram:- RAIN DETECTOR ALARM CIRCUIT


Touch Sensitive Switch or Security Alarm