Guide to Understanding the Inner-working of an SMD Buzzer

by Sergio Clark
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Buzzers are essential features in electrical and electronic appliances, which include security panels, computer peripherals, door-entry systems, home appliances, etc.

They are very cost-effective ways to indicate start and end of processes, state of equipment, enhance user interactions, raise alarms if they are defects and insecurities, and enhance user experience and interaction.

They are generally two types of buzzers: the magnetic and piezoelectric buzzers.

Your purchase choice is largely determined by the output audio power, available physical space, and the features of the drive signal. Then, you also have to choose between transducer and indicator types, and it depends on the kind of sounds you desire.

Another factor is the kind of supplier you decide to purchase from. The SMD buzzer china supplier must be one that’s trustworthy and capable of delivering quality products at all times.  

Without further ado, let’s look at the types of SMD buzzers, shall we?

  • Magnetic buzzers

These types of buzzers are driven by current, and they normally need about 20mA to operate. Their applied voltage ranges from 1.5V to 12V.

The mechanism of this buzzer is pretty basic. The system consists of a flexible ferromagnetic disk and a coil. As the current passes through the coil, it attracts the disk. When the current stops flowing, it returns to its usual position.

Now, when this disk is attracted, it creates a deflection that causes air in the area to move. The human ear now interprets this movement as sound.

Now, you may ask, how is the current that passes through this coil determined? It is determined by coil impedance, and of course, the applied voltage.

If you don’t have experience in purchasing buzzers, how can you make the right choice? A great SMD buzzer china supplier will guide you.

Now, that we know how a magnetic buzzer operates, let’s look at piezo buzzers.

  • Piezo buzzers

Unlike magnetic buzzers, this type is driven by voltage. Their applied voltage is higher; it ranges between 12V to 220V, while the current is lower than 20mA. They are completely opposite.

One great way to remember their differences is to note that the magnetic buzzer looks similar to a coil that is in series with a resistor, while the piezo buzzer looks similar to a capacitor.

The piezo buzzer has unique elements. It consists of a disk made of piezoelectric substance and electrical contacts that are fastened to both sides of the disk. When voltage runs through this disk, the electrodes deforms the piezoelectric substance.

This deformation causes air movements which the human ear interprets as sound.

When purchasing any buzzer, you have to look at the characteristics of the drive signal. This is because they determine whether to buy a magnetic or piezo buzzer. If you want loud equipment, piezo buzzers give a higher Sound Pressure Level (SPL) compared to magnetic buzzers.

This is why it is so important to choose a great supplier and have a professional technician join you in the search for SMD Buzzers. To choose a great SMD buzzer china supplier, you have to do a lot of research and carefully choose.

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