Product Category


19MM Metal Buzzer Loud Flash Sound Explosion-Proof Buzzer


19 MM Metal Buzzer 220v24v Loud 12v Flash Intermittent Sound Waterproof Explosion-Proof Buzzer


Hello everyone, it is a great honor to introduce our company again.

Our name is Yueqing Yulin Electronics Co., Ltd., and our company is an innovative industrial and trade company integrating R&D, production and sales.

The company was established in 1998 and has a history of 21 years. Now the company has three factories and a trading company.

Our company mainly produces indicator lights, metal button switches, rocker switches, guitar switches, touch system switches, waterproof micro switches and other products.

Our company is one of the most complete indicator light manufacturing companies in the world, and the only mainland manufacturer in China with UL metal button certification.

Our company is the founder of wire and metal buttons, as well as the creator of waterproof high-current rocker switches.

Below, our company briefly introduces a 19 mm metal buzzer 220v24v loud 12v flash intermittent sound waterproof explosion-proof buzzer product.

The buzzer is an electronic buzzer with an integrated structure. It is powered by DC voltage and is widely used as a sound device in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers, etc…

Buzzers are mainly divided into two types: piezoelectric buzzer and electromagnetic buzzer.

The buzzer is an integrated structure of an electronic buzzer, which belongs to a kind of electronic component.

Metal Buzzer Purpose/Function

It is a sounding device that can convert audio signals into sound signals. It is widely used in household appliances, in the alarm systems of banks and public security, and in electronic toys and game consoles.

It is mainly used for promoting or alarming. According to different designs and uses, it can emit various sounds such as music, siren, buzzer, alarm, and electric bell.

The buzzer used in the washing machine often buzzes to remind the user of the operation process.

Most of the buzzers used in burning appliances emit alarm sounds to warn users that the burning appliances are burning dry. As the doorbell application, the buzzer often emits “ding dong” or music to remind guests to visit.

The buzzers installed in the police, bank, and home guard areas often sounded. If someone enters the guard area, under the action of sensor control, the buzzer will sound the alarm.

Buzzers used in factories and schools often emit electric bells.

Metal Buzzer drive mode

Since the self-excited buzzer is driven by a DC voltage, it does not need to be driven by an AC signal. You only need to output the drive level to the drive port and amplify the drive current through a transistor to make the buzzer sound. It’s very simple. The self-excited metal buzzer is explained.

Here, only the externally activated buzzer that must be driven by a 1/2duty square wave signal is described.

There are two ways for a single-chip microcomputer to drive a separately excited metal buzzer:

One is the direct drive of the PWM output port

The other is to use I/O to periodically flip the level to generate a driving waveform to drive the metal buzzer.

The direct drive of the PWM output port is to use the PWM output port itself to output a certain square wave to directly drive the buzzer.

There are several system registers in the software settings of the MCU to set the output of the PWM port. You can set the duty cycle, period, etc. After setting these registers to generate the frequency waveform that meets the requirements of the buzzer, just turn on the PWM Output, the PWM output port can output a square wave of the frequency. At this time, this waveform can be used to drive the buzzer.

For example, when driving a buzzer with a frequency of 2000 Hz, you can know that the period is 500 μs. In this way, you only need to set the PWM period to 500 μs and the duty cycle level to 250 μs to generate a square wave with a frequency of 2000 Hz. The square wave can use the triode to drive the metal buzzer.

However, it is a bit more troublesome to use I/O to periodically flip the level to generate the driving waveform. A timer must be used for timing. The waveform of the frequency that meets the requirements of the metal buzzer is generated by the timing flip of the level. This waveform can be used to drive the metal buzzer.

For example, for driving a 2500Hz buzzer, you can know that the period is 400μs, so you only need to drive the I/O port of the buzzer to flip the level every 200μs to generate a frequency of 2500Hz and a duty cycle of 1/2duty. The square wave can drive the metal buzzer by magnifying it through the triode.


More Popular Product of FILN : plastic indicator light

Tail configuration Wiring post (4*4mm)
Nut torque About 0.6Nm
Key material Not embroidered copper
Shell material Not embroidered copper
Base material PA66
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