What is a Buzzer : Working & Its Applications
2022-11-15
  • There are many ways to communicate between the user and a product. One of the best ways is audio communication using a buzzer IC. So during the design process, understanding some technologies with configurations is very helpful. So, this article discusses an overview of an audio signaling device like a beeper or a buzzer and its working with applications.

  • What is a Buzzer?

    An audio signaling device like a beeper or buzzer may be electromechanical or piezoelectric or mechanical type. The main function of this is to convert the signal from audio to sound. Generally, it is powered through DC voltage and used in timers, alarm devices, printers, alarms, computers, etc. Based on the various designs, it can generate different sounds like alarm, music, bell & siren.

  • Buzzer Pin Configuration

  • The pin configuration of the buzzer is shown below. It includes two pins namely positive and negative. The positive terminal of this is represented with the ‘+’ symbol or a longer terminal. This terminal is powered through 6Volts whereas the negative terminal is represented with the ‘-‘symbol or short terminal and it is connected to the GND terminal.


    History

    The history of an electromechanical buzzer and piezoelectric is discussed below.


    Electromechanical

    This buzzer was launched in the year 1831 by an American Scientist namely Joseph Henry but, this was used in doorbells until they were eliminated in 1930 in support of musical bells, which had a smooth tone.


    Piezoelectric

    These buzzers were invented by manufacturers of Japanese & fixed into a broad range of devices during the period of 1970s – 1980s. So, this development primarily came due to cooperative efforts through the manufacturing companies of Japanese. In the year 1951, they recognized the Application Research Committee of Barium Titanate that allows the corporations to be cooperative competitively & bring about numerous piezoelectric creations.


    Specifications

    The specifications of the buzzer include the following.

    > Color is black

    > The frequency range is 3,300Hz

    > Operating Temperature ranges from – 20° C to +60°C

    > Operating voltage ranges from 3V to 24V DC

    > The sound pressure level is 85dBA or 10cm

    > The supply current is below 15mA


    Types of Buzzer

    A buzzer is available in different types which include the following.

    > Piezoelectric

    > Electromagnetic

    > Mechanical

    > Electromechanical

    > Magnetic


    Piezoelectric

    As the name suggests, the piezoelectric type uses the piezoelectric ceramic’s piezoelectric effect & pulse current to make the metal plate vibrate & generate sound. This kind of buzzer is made with a resonance box, multi resonator, piezoelectric plate, housing, impedance matcher, etc. Some of the buzzers are also designed with LEDs.

    The multi resonator of this mainly includes ICs and transistors. Once the supply is given to this resonator, it will oscillate and genera

  • Water Level Circuit using Buzzer

  • How to Choose a Buzzer?

    While choosing a buzzer or speaker, many principles need to consider like the following.

    > Size of the product

    > Consumption of Current

    > Type of terminal

    > Frequency Voltage

    > Volume

    > Type

    > AC/DC Voltage

    > The tone is Continuous/Pulsed

    > Fixing – Pins, Leads/Surface Mount

    > Output of Sound

    > Feedback Option

    > Piezo Elements


    Advantages

    The advantages of a buzzer include the following.

    > Simply Compatible

    > Frequency Response is Good

    > Size is small

    > Energy Consumption is less

    > The Range of Voltage usage is Large

    > Sound Pressure is high


    Disadvantages

    The disadvantages of the buzzer include the following.

    > Controlling is a little hard

    > Generates Annoying Sound

    > Training is necessary to know how to repair the condition without just turning off.


    Applications

    The applications of the buzzer include the following.

    > Communication Devices

    > Electronics used in Automobiles

    > Alarm Circuits

    > Portable Devices

    > Security Systems

    > Timers

    > Household Appliances

    > Electronic Metronomes

    > Sporting Events

    > Annunciator Panels

    > Game Shows


    Thus, this is all about an overview of a buzzer data sheet that includes its working principle, pin configuration, specifications, circuit, advantages, disadvantages & its applications. It is an electromechanical, electromagnetic, mechanical, piezoelectric, electro-acoustic audio signaling device. This buzzer works through an audio signal source or oscillating circuit. A ring or beep or click indicates that a switch has been pushed. Here is a question for you, what are the features of a buzzer ?


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