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Overview of Buzzer

pavanakp1904

Updated: Jan 16

Introduction


A beeper, buzzer, or other auditory signaling device can be mechanical, piezoelectric, or electromechanical in nature. This is mostly used to transform the audio signal into sound. It is often powered by DC voltage and is found in computers, printers, alarm clocks, timers, and other devices. It may produce a variety of sounds, including alarms, music, bells, and sirens, according to the varied designs.

Buzzer
Buzzer

Positive and negative pins are the two that are included. This can have a longer terminal or the '+' sign to indicate its positive termination. This terminal draws power from six volts, whereas the negative terminal, which is linked to the ground wire, is denoted by the short terminal or the sign '-'.



Types of Buzzer


Piezoelectric:

Piezoelectric Buzzer
Piezoelectric Buzzer

As the name implies, the piezoelectric type vibrates and produces sound on the metal plate by means of the piezoelectric effect and pulse current of the piezoelectric ceramic. Resonance boxes, multiple resonators, piezoelectric plates, housing, impedance matchers, and other components are used to make this type of buzzer. LEDs are also included into the design of some buzzers.


Transistors and Integrated circuits make up the bulk of this multi-resonator. This resonator will oscillate and produce an audio signal at 1.5 to 2kHz as soon as it receives power. The piezoelectric plate will be forced to make sound by the impedance matcher.



Electromagnetic Buzzer
Electromagnetic Buzzer

A magnet, solenoid coil, oscillator, housing, vibration diaphragm, and magnet are the components used to make this kind of buzzer. When the power source is turned on, the oscillator that generates the audio signal will start to send current through the solenoid coil, creating a magnetic field.


Under the influence of the magnet and solenoid coil, the vibration diaphragm will occasionally vibrate and produce sound. Its frequency range is between 2 kHz and 4 kHz.


Mechanical:

Mechanical Buzzer
Mechanical Buzzer

The components utilized in these buzzer types are identical because they are subtypes of electromagnetic buzzers. However, the most notable distinction is that the buzzer is now external rather than internal.


Electromechanical Buzzer
Electromechanical Buzzer

An electromagnet and a bare metal disk may be used to construct these kinds of buzzers. This operates on a similar concept to electromagnetic and magnetic fields. It produces sound as the disc moves and becomes magnetized.


Magnetic:

Magnetic Buzzer
Magnetic Buzzer

Similar to a piezo type, a magnetic type similarly produces sound; however their fundamental functions distinguish them. Because the magnetic type operates via a magnetic field, it is more fixed than the piezo type.


Magnetic buzzers create a magnetic field by using an electric charge rather than piezo materials. This allows a different component of the buzzer to vibrate and produce sound.

The uses of magnetic buzzers are comparable to those of piezo alarms used in watches, clocks, and keyboards, among other household appliances.


Buzzer Usage


An effective way to add sound elements to our system or project is to use a buzzer. It is a very compact and sturdy two-pin gadget, so using it on a breadboard or PCB is easy. Therefore, this component is frequently utilized in most applications.


Buzzers come in two primary varieties: premade and simple. A basic kind will continually emit beeps once it is powered on. A prefabricated kind emits a beep and seems heavier. Beep. Beep. Its internal oscillating circuit produces this sound.