Fastest Finger Press Quiz Buzzer

This is a smart security circuit for cash box that prevent the theft attempt by activating an emergency beeper. A battery is provided to supply the power to the circuit with help of a switch. It uses an LDR as sensor and gives signal to a binary counter the output of which drives the transistor. In case if the cash box is being theft, a buzzer blows and load is ON for indication. This circuit is mainly useful at Banks, Hotels, shopping malls, household appliances, etc.

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