How To Make A Buzzer?

Bookmark added to your notes.
View Notes
×

What is a Buzzer?

A buzzer is a small audio signaling device comprising a piezoelectric material.

It produces a sound under the influence of an external voltage. 

It is used in alarm devices, timers, and confirmation of user input such as a mouse click or keystroke.

Several kinds of buzzers are mechanical, electrochemical, and piezoelectric.

We commonly use a piezoelectric buzzer, which is just a flat piece of piezoelectric material with two electrodes. 

It requires an oscillator for its functioning. On supplying a DC voltage to it, we just get a click. 

It is a tiny 2-pin compact structure having a positive and a negative terminal.

[Image will be uploaded soon]

We can use it in the places where we need something that emits an audible tone. 


How to make a Buzzer?

There are many ways in which we can make a buzzer. 

Let’s get started with their types one-by-one.

Materials required:

  1. A wooden block

  2. Cardboard or the same sized wooden cube

  3. Some drawing pins

  4. A blade with a hole at one end.

  5. An electromagnet (A copper wire wrapped on the nail)

[Image will be uploaded soon]

Step 1:  Make holes inside a wooden block.                             

Step 2: Insert this electromagnetic hole inside a hole made at one end of the block.

Step 3: Hammer the electromagnet nail on the hole of a block.

Step 4: Place cardboard at another end of the block.

Step 5: Now, attach a blade to the cardboard with the drawing pins.

Step 5: Place another end of the blade over the tip of the nail.

Step 6: Take a battery (of 12 V). Join the positive terminal of the battery with the help of a clip to one end of the electromagnet, and negative to the blade.

Now, slightly touch another end of the electromagnet to the blade, you would hear a buzzing sound.

[Image will be uploaded soon]


How to make a Simple Buzzer?

A buzzer comprises two terminals; one is positive and the other negative.

[Image will be uploaded soon]

On connecting its positive terminal with the positive terminal of the battery, and the negative to the negative terminal of a battery, the buzzer produces a beeping sound. 

This is how we can make a simple buzzer.


What is a Buzzer Circuit?

A buzzer is a high-frequency oscillator circuit that is used for producing a buzzing or a beeping sound through a transducer or speaker output.


How to make a Buzzer Circuit?

Materials required:

  1. Bc547 Transistor  

[Image will be uploaded soon]

  1. Tricolor LED

[Image will be uploaded soon]

  1. 1K Ohm Resistor

[Image will be uploaded soon]

  1. 220 Ohm Resistor

[Image will be uploaded soon]

  1. 6 V Buzzer

[Image will be uploaded soon]

  1. A switch

[Image will be uploaded soon]

Steps to make a Buzzer Circuit

  1. Bend the ends of a transistor. Hold it with a clip.

[Image will be uploaded soon]

  1. Attach one end of 1K ohm resistor to the emitter and another end to the base of a transistor.

  2. Similarly, attach one end of the 220-ohm resistor to the base and the other to the negative terminal of the led.

  3. Bend the other end of the led, take another 220-ohm resistor and make a connection from a collector of the transistor to the positive terminal of the led.

  4. Join the positive wire of the buzzer to the positive terminal of the led, and negative wire to the transistor’s collector.

  5. Take 3.7V li-ion battery; connect its positive terminal to the positive terminal of led, and the negative to the emitter.

  6. Connect the wire of a switch to the emitter.

  7. Now, the circuit is ready; press the button, the buzzer makes a sound.

Here, we can take a 12V buzzer also, but, to get a lesser sound, we used a 6V buzzer.


What is the Function of a Buzzer in a Circuit?

A buzzer is an acoustic component with an integrated structure that we use as an alerting tone and alarm sound.

It supplies power with DC voltage.

We use them in various places such as:

  1. Computer

  2. Printer

  3. Duplicator

  4. Alarmer

  5. Digital toy

  6. Car electronic device

  7. Telephone

  8. Stopwatch

In all these devices, its main function is reminding and alarming.


Buzzer Test

To perform a buzzer test, we need to follow these steps outlined below:

  1. Take a PCB (Printed circuit board), and connect red led to it.

[Image will be uploaded soon]

  1. Now, connect green/blue led to it. Now place the red and blue led side-by-side; connect the positive terminal to the negative(red to blue led) or negative to the positive terminal (red to blue) as shown below:

[Image will be uploaded soon]

  1. Take a 1K ohm resistor and connect it on the board as shown below:

[Image will be uploaded soon]

  1. Connect the buzzer

[Image will be uploaded soon]

  1. Probe everything at the other side of the board as shown below:

[Image will be uploaded soon]

As you can see the probed part of the PCB is the positive line and parallel to it is a negative line.

[Image will be uploaded soon]

  1. Now, probe positive wire to the positive line, and negative to the negative line as shown below:

[Image will be uploaded soon]

[Image will be uploaded soon]

  1. Flip the PCB

[Image will be uploaded soon]

  1. On making a wrong connection with the battery, the blue led glows.

[Image will be uploaded soon]

  1. On making a wrong connection as shown below:

[Image will be uploaded soon]

  1. Red led glows, and the buzzer warns with a long beeping sound.

[Image will be uploaded soon]

So, our buzzer testing is successful as it is working well.

FAQ (Frequently Asked Questions)

Q1: How Loud is a Buzzer?

Ans: A buzzer can provide loud sound when we put it in the collector circuit.

Therefore, its input power can be minimized and the output sound pressure level can be maximized when it operates at its resonant frequency. 

We can get 125 dB sound with 200 mA if we want it that loud.

Q2: Is the Buzzer a Sensor?

Ans: Yes, the buzzer is a sensor.

It is like a magnetic speaker, which needs voltage with different frequencies so that it can generate sound accordingly. 

The pitch becomes louder on increasing the frequency.

Q3: What is a Buzzer Code?

Ans: Bell codes or buzzer codes are the US communication Signal Appliance codes.

We use them in passenger trains for communication between the driver and the guard.

Q4: How many types of Buzzers are there?

Ans: There are several types of buzzers. Some of them are:

  1. Electro-Acoustic

  2.  Electromagnetic

  3. Electromechanic

  4. Mechanical

  5. Magnetic

  6. Piezoelectric (Piezo means short) Buzzer.

Two types of buzzers are commonly available. They are:

  1. Active Passive Buzzer

[Image will be uploaded soon]

  1. Active Passive Buzzer Pinout

[Image will be uploaded soon]