Buzzer

A 'buzzer (in English 'buzzer') is an electroacoustic transducer that produces a continuous sound or buzz or intermittent of the same tone (generally acute). It serves as a signaling or warning mechanism and is used in multiple systems, such as in automobiles or in household appliances, including alarm clocks.

Initially, this device was based on an electromechanical system that was similar to an electric bell, but without the metal clapper, which imitated the sound of a bell.

Its construction consists of two elements, an electromagnet or piezoelectric disc and a metallic sheet of steel or metal. The buzzer can be connected to special integrated circuits in order to achieve different tones.

There are two different types: electromagnetic and piezoelectric.

In the first, when activated, the current passes through the coil of the electromagnet and produces a variable magnetic field that vibrates the steel sheet on the armature. In the second, the current passes through the piezoelectric disc, causing it to enter electrical resonance and producing ultrasound that is amplified by the steel or metal sheet.

The sound level can reach 80 decibels depending on the model, so they are a good alternative to the bell ringer in noisy environments.