Monday, May 23, 2011

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Water Level Indicator With Buzzer Circuit Using Transistor

This is a simple water level indicator circuit that is based on few transistors . The circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when the tank is full.
Water Level Indicator With Buzzer Circuit Using Transistor
Water Level Indicator + Buzzer Circuit Using Transistor
The circuit is very simple and it has a very low current consumption , so you can use a 9 volts battery to powering this water level indicator alarm . This water level indicator alarm electronic circuit can be used even for rain alarm or short circuit alarm , a resistance with a value from 0 to about 1 M ohm will trigger it . The Q1 transistor acts as a switch which applies current to the unijunction relaxation oscillator Q2 . The signal frequency of the alarm circuit is give by the values and ratios of the C1 / R2 .

If you don’t have the transistors marked on the schematic diagram you can replace them almost with any similar types.

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