What does a buzzer do and how does a buzzer work?

Buzzer, as the name suggests, is used for sound alarm, and its models are used on industrial equipment, as well as for household appliances (circuit boards), etc., but the function is the same.

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Buzzer (English buzzer) is an integrated structure of electronic signal, belongs to a kind of electronic components, using DC voltage or AC voltage power supply, widely used in the computer industry (motherboard buzzer, chassis buzzer, computer buzzer) printer (control board buzzer), copier, alarm industry (alarm buzzer, alarm buzzer), electronic toys (**buzzer), agriculture, automotive electronic equipment industry (car buzzer, reversing buzzer, car buzzer, Motorcycle buzzer) ** machine (environmental protection buzzer), timer, air conditioning, medical equipment and other electroacoustic industry, environmental monitoring.

Here's how it works:

The buzzer works using the principle of piezoelectric effect, which produces mechanical vibrations when an alternating voltage is applied to it; Conversely, when a mechanical force is applied to it, it also generates a voltage signal. Therefore, piezo buzzers can be used as vibration sensors. The voltage signal generated by the piezoelectric ceramic buzzer when it is subjected to mechanical force is very weak, and it should be connected to a voltage amplifier when used as a vibration sensor.

Buzzers are divided into active buzzers and passive buzzers, and the sound generation methods are different. The active buzzer can be directly connected to the rated power supply to continuously sound sound; Passive buzzers, like electromagnetic speakers, need to be connected to the audio output circuit to periodically vibrate and emit sound. The circuit should be an active buzzer.

The buzzer can not produce a changing sound, if you want to judge the wind speed, you can add an LED light, by the brightness to judge, but this method is also not accurate, can only be used as a reference. The working sound principle derived from the excitation buzzer is: the DC power input is transmitted through the amplification and sampling circuit of the oscillation system to generate a sound signal under the action of the resonant device.

The working sound principle of the passive hecitron buzzer is: the square wave signal input resonant device is converted into the sound signal output.

Buzzer is an electronic signal with integrated structure, powered by DC voltage, and widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, machines, timers and other electronic products as sound devices. Buzzers are mainly divided into two types: piezoelectric buzzers and electromagnetic buzzers. Buzzers are represented in circuits by the letters "H" or "HA" (old standards were used as "fm", "zzg", "lb", "jd", etc.).

ActiveBuzzerThe differences with passive buzzers are as follows:

First, there is no ** source.

Passive "source" here does not refer to the power supply, but to the ** source. That is to say, the active buzzer has a ** source inside, so it will be called as soon as it is powered on. The passive does not have a ** source inside, so if you use a rough DC signal, you can't make it chirp.

Second, ** is different.

Active buzzers tend to be more expensive than passive buzzers, because of the multiple circuits in them.

Third, the height is different.

From the appearance of Figures A and B, the two buzzers seem to be the same, but if you look closely, there is a slight difference in the height of the two, the height of the active buzzer A is 9mm, and the height of the passive buzzer B is 8mm. For example, when the pins of the two buzzers are placed upwards, it can be seen that a cluster of stools with a green circuit board is a passive buzzer, and an active buzzer without a circuit board and closed with vinyl.

Fourth, the advantages are different.

The advantages of passive buzzers are: cheap; The sound frequency is controllable, which can make the effect of "Doramifa Solasi"; In some special cases, a control port can be multiplexed with LEDs.

The advantage of the active buzzer is: convenient program control.