water tank overflow alarm

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Here is a simple water overflow alarm circuit to prevent overflow of water from overhead tanks. The circuit can be carried out to healthy different programs as properly that require liquid degree measurement. It is constructed around two BC547 transistors (T1 and T2) and two timer 555 ICs (IC1 and IC2). Both IC1 and IC2 are stressed out in astable multivibrator mode. Timer IC1 produces low frequency, at the same time as timer IC2 produces a excessive frequency. As a end result, a beeping tone is generated when the liquid tank is complete.

Circuit operation
Initially, while the tank is empty, transistor T1 does not conduct. Consequently, transistor T2 conducts and pin four of IC1 is low. This low voltage disables IC1 and it does not oscillate. The low output of IC1 disables IC2 and it does no longer oscillate. As a end result, no sound is heard from the speaker.

But whilst the tank gets crammed up, transistor T1 conducts. Consequently, transistor T2 is cut off and pin four of IC1 will become excessive. This high voltage permits IC1 and it oscillates to supply low frequencies at pin three. This low-frequency output permits IC2 and it also oscillates to provide excessive frequencies. As a result, a sound is produced by way of the speaker. Using preset VR1 you may manipulate the quantity of the sound from the speaker.