A buzzer is an electronic
signaling device commonly used in cars, trucks, microwave ovens or
game shows. Buzzers also work in the same manner as an alarm works.
They are generally equipped with sensors or switches connected to a
control unit.
The work of the control unit is to identify the button, which was
pushed, or the lapse of the preset time. After identification it
sounds a warning tone which is in the form of buzzing or beeping
sound. Earlier electromechanical buzzers were used but nowadays
ceramic-based piezoelectric buzzers have become more popular. The
different types of buzzers are classified on the basis of their
technology as electric buzzers, magnetic buzzers, piezoelectric
buzzers and piezo buzzers. While buying a buzzer people always keep
in mind the number of sensors present in the buzzer and how easily
it can be installed.