• Quality Buzzer made by Buzzer manufacturer in China in the Acoustic World

Frequently Asked Questions

Generally speaking, a buzzer is an electric acoustic part that can produce the sound. Buzzers are also sometimes called audible alarms.

Roughly there are ten buzzers as follows:

1. Piezo electric buzzers with no source (External Drive)

2. Piezo electric buzzers with no source ( or passive) (Self Drive)

3. A whole magnetic buzzers with no source

4. A partitioned magnetic buzzers with no source

5. Piezo electric buzzers with sources

6. Whole magnetic buzzers with sources

7. Partitioned magnetic buzzers with sources

8. Pasting piezoelectric buzzers with no sources (SMD)

9. Pasting magnetic buzzers with no sources (SMD)

10. Pasting magnetic buzzers with sources (SMD)

There are a great variety of electronic acoustic parts on the market, one of which is the buzzer.

How to enquire the manufacturers about the buzzers wanted?

As a matter of fact, you only need to know about the following three specifications:

1. Frequency (KHz):

What is the frequency used?

For example: 4.0KHz or 2.0KHz and so on.

2. Voltage (Vp-p or Vdc):

Does it have sources or not? And how much is the voltage?

3. Size (mm):

What is the size of it?

For example: Width 14mm or 12mm, height 7.6mm or 9.5mm.

It is suggested that the users should explain to the manufacturers to enable them to acknowledge and acquire the samples of the buzzers and to set the prices quickly if the users also know the following specifications:

1. Which will be used, the piezo electric buzzer or the magnetic buzzer?

2. If the magnetic buzzer is used, is it “a whole with no sources” or “a partition with no sources”, or “a whole with sources” or “a partition with sources”?

This confirmation is concerned with the pricing.

3. Space between pins (mm) : What is the space used between the pins?

For instances: 6.5mm, 7.6mm or 10mm and so on.

4. Sound pressure (dB) : What is the sound pressure used?

For example: 80dB, 90dB or 95dB and so on.

5. Electrical current (mA) : What is the electrical current used?

For example: 0.7mA or 25mA and so on.

Most buzzer users rarely have the following five kinds of testing buzzer equipment, especially the first (a) and (b)

(a), function signal generator.
(B), decibel meter (noise meter).
(C), the power regulator.
(D), a three-use meter.
(E), voltage converter / inverter (0 ~ 300Vac / 3 ~ 10A).

The industry test buzzer, there are certain norms and operations, if the user does not have the equipment to measure the buzzer what to do?

Generally, buzzers will be installed on the products and then tested whether they will make a sound or not. This is a good way to test the buzzer. But the problem is that the sound of the buzzer is “seemingly” smaller than the sound of the buzzer already used, or “seemingly” the sound is similar to the buzzer uesd. The reason is the same as eating and buying clothes, some people think it is good, some people think it is not.

Our company suggests the following points for the user’s reference, as follows.
(1) The user should purchase the instrument and equipment and do the incoming inspection test according to the specification provided by our company.
(2) If the user is unable to purchase the equipment, he/she can do the comparison of incoming inspection test by means of limited samples, that is to say, he/she can file the samples that he/she acknowledges and considers to be qualified, so that he/she can use them as a tool for future comparison.

Piezoelectricity, discovered in the 1880’s during experiments on quartz, is produced from the interrelationship of a material’s mechanical and electrical properties. In essence, when a piezoelectric material is squeezed, an electrical charge collects on its surface. Conversely, when a piezoelectric material is subjected to a voltage drop, it mechanically deforms.

Many crystalline materials exhibit piezoelectric behavior. A few materials exhibit the phenomenon strongly enough to be used in applications that take advantage of their properties. These include quartz, rochelle salt, lead titanate zirconate ceramics (e.g. PZT-4, PZT-5A, etc.), barium titanate, and polyvinylidene flouride (a polymer film).

On a nanoscopic scale, piezoelectricity results from a non-uniform charge distribution within a crystal’s unit cells. When such a crystal is mechanically deformed, the positive and negative charge centers displace by differing amounts. So while the overall crystal remains electrically neutral, the difference in charge center displacements results in an electric polarization within the crystal. Electric polarization due to mechanical input is perceived as piezoelectricity.

From an engineering or modeling point of view, piezoelectricity results in a change to a material’s constitutive properties. Many finite element codes include piezoelectric modeling capability.

The loudness of an buzzer is also known as sound pressure. Sound pressure is expressed in terms of decibels (dB). In shopping for an buzzer, the customer will of course want to know the loudness of the buzzer. However, loudness will vary depending upon the listener’s distance from the buzzer.

The industry standard measures the dB level from a distance of 2 feet (0.61 M) from the buzzer. Thus when you see in a product description that an buzzer produces 102 dB, that should mean 102 dB at a distance of 2 feet from the buzzer.

dB is the standard unit of measure for sound pressure level. dBA takes the standard unit of measurement of dB and applies an A-Weighted scale which helps compensate for the human ear versus a microphone as a sound measuring device. By applying an A-Weighted scale to the measurement of sound pressure level, you are putting different frequencies on a level playing field.

Piezoelectric buzzers utilize a piece of ceramic adhered to a metal disc. When voltage is applied to the ceramic material it causes the metal disc to physically flex, which produces a sound. Electro-Mechanical buzzers utilize electro-magnetic material and a metal disc in close proximity. When the electro-magnetic material is energized, it causes the metal disc to physically flex, which produces sound.

There are five primary criteria to consider in selecting a piezo audible buzzer:

  • Tone type (i.e. continuous, beep, warble, etc.)
  • Voltage range (AC, DC or AC/DC; from 1 V to 220)
  • Sound level (medium loud, extra loud, ultra loud)
  • Case (body) styles (i.e. panel mount, PC mount, flanged)
  • Termination (i.e. wire leads, PC pins, push-on, screw-on)
  • Current
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