When the piezoelectric sensor does not activate the output though the piezoelectric sensor has a low value at this instant input is high and operates the Schmitt trigger in resulting sound produced through the buzzer.The R1 resistance adjusts the threshold voltage of the circuit. In the below circuitry, LM348 is configured by inverting the Schmitt trigger.It uses piezoelectric sensors that operate as shock sensor which is mounted on the door that we have to guard It operates as an anti-theft alarm in vehicles. The shock alarm circuitry is commonly used in vehicles and created through the use of LM358.
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