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- Any electronic device that is capable of producing a buzzing sound so that it can be used for the purpose of signaling can be called as a buzzer.
- Beeper is an alias for the buzzer and can be seen in timers, automobiles, alarm devices, other household appliances, etc.
- Joseph Henry invented buzzer in the year 1831. It was a simple electric buzzer that would be present in doorbells.
- But today a variety of buzzers are available. The buzzers can be electroacoustic, electromagnetic, electromechanics, piezoelectric, etc.
A typical buzzer consists of two ends that can be plugged into a breadboard. Inside a buzzer, there exists a ceramic disc that is surrounded by a metal disc.
When the current is supplied to the buzzer the metallic disk vibrates causing a sound as a result of the expansion or contraction of a ceramic disc present inside the buzzer. If you intend to change the pitch of the sound, then you must vary the frequency of the buzzer.
In case of an electromechanical buzzer their exists a magnet inside the buzzer along with a coil and a diaphragm. The supply of voltage causes the diaphragm to move towards the magnet. Thus the diaphragm begins to vibrate and sound is emitted since the current flowing in the coil produces a magnetic field.
Another type of buzzer could be a purely mechanical buzzer. Hand buzzers or so called joy buzzers are mechanical buzzers. Generally, they are worn around a palm and when the person wearing such kind of buzzer shakes hand with the other person, that person gets a kind of shock. Actually their exists a coiled spring inside the buzzer and during the handshake this coil is unwound producing vibrations that appear as an electric shock.
Merits of buzzer
- The tiny and compact buzzers comes handy while constructing various circuits.
- Piezo buzzers operate at extremely low currents thereby reducing power consumption.
- Buzzers are quite cheaper as compared to other audio accessories like speakers.