What is the buzzer, what is the role
The buzzer is an integrated structure of the electronic buzzer, using DC voltage power supply, widely used in computers, printers, photocopiers, alarms, electronic toys, automotive electronics, telephones, timers, and other electronic products as a sound device. Buzzer is mainly divided into piezoelectric buzzer and electromagnetic buzzer two types.
Buzzer is a kind of integrated structure of the electronic alarm, belongs to a kind of electronic components, using DC voltage or AC voltage power supply, widely used in the field:
Computer industry printers, photocopiers, alarm industry, electronic toys, agriculture, automotive electronics industry, telephone, timer, air conditioning, medical equipment, such as electroacoustic industry, environmental monitoring.
Extended information:
Buzzer can not be used as an ore radio, because, the buzzer has an oscillating circuit within it, and when powered on it will drive a micro-speaker within it to emit a beep sound. A buzzer is not a mere little horn. Also, there are two types of buzzers. One is the one with an internal oscillator;
One is the one that requires an external oscillator, which is an ordinary miniature horn. For the kind without an oscillator, it is also unusable, because its resistance is usually about 32 ohms, and there are also 8 ohms or 16 ohms. These are low impedance, so they won't work.
Baidu Encyclopedia - Buzzer
What is a buzzer
Buzzer is a kind of integrated structure of electronic signaling device, using DC voltage power supply, widely used in computers, printers, copiers, alarms, electronic toys, automotive electronics, telephones, timers, and other electronic products as a sound generator. Buzzer is mainly divided into piezoelectric buzzer and electromagnetic buzzer two types. Buzzer in the circuit with the letter "H" or "HA".
How does a buzzer work?
The structural principle of the buzzer
1. Piezoelectric buzzer
The piezoelectric buzzer is mainly composed of a multi-harmonic oscillator, piezoelectric buzzer chip, impedance matcher and **** sound box, shell and so on. Some piezoelectric buzzer shell is also equipped with light-emitting diodes.
Multi-tuned oscillator composed of transistors or integrated circuits. When the power supply is turned on, the multi-tuned oscillator vibration, the output 1.5 ~ 2.5khz audio signal, impedance matching device to promote the piezoelectric buzzer sound.
The piezoelectric buzzer is made of lead zirconate titanate or lead niobium magnesium piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic sheet, which are polarized and aged, and then glued together with a brass or stainless steel sheet.
2. Electromagnetic buzzer
Electromagnetic buzzer consists of an oscillator, electromagnetic coil, magnet, vibrating diaphragm and shell.
After the power supply is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm vibrates periodically to produce sound under the interaction of the electromagnetic coil and the magnet.
Electric bell
When the power is turned on, the electromagnet has a current through it and produces magnetism, which sucks the elastic piece under the hammer and makes the hammer strike the electric bell to make a sound; at the same time, the circuit is broken, the electromagnet loses its magnetism, the hammer is bounced back, the circuit is closed, and the circuit repeats, and the electric bell makes a continuous striking sound.
What are the types of buzzers?
The buzzer is a kind of integrated structure of electronic ringer, mainly divided into piezoelectric buzzer and electromagnetic buzzer two types. The buzzer is indicated by the letter "h" or "ha" in the circuit.
1. Distinguished from the structure
. Piezoelectric buzzer piezoelectric buzzer is mainly composed of a polytunnel oscillator, piezoelectric buzzer, impedance matching and *** sound box, shell and so on. Some piezoelectric buzzer shell is also equipped with light-emitting diodes.
Multi-tuned oscillator composed of transistors or integrated circuits. When the power supply is turned on, the multi-tuned oscillator vibration, the output 1.5 ~ 2.5khz audio signal, impedance matching device to promote the piezoelectric buzzer sound.
The piezoelectric buzzer is made of lead zirconate titanate or lead niobium magnesium piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic sheet, which are polarized and aged, and then glued together with brass or stainless steel sheets.
. Electromagnetic buzzer Electromagnetic buzzer consists of an oscillator, electromagnetic coil, magnet, vibrating diaphragm and shell.
After turning on the power supply, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm vibrates periodically to produce sound under the interaction of the electromagnetic coil and magnet.
2. Distinguish between active buzzer and passive buzzer
Now on the market for sale a small buzzer because of its small size, light weight, low price, solid structure, and widely used in a variety of electrical equipment, electronic production and microcontroller need to sound circuit. The appearance of active and passive buzzers is shown in Figures a and b. The two buzzers seem to be the same, but look closely, the height of the two slightly different, active buzzer a, height of 9mm, and passive buzzer b height of 8mm. such as the two buzzer pin county when placed towards the top, you can see that there is a green circuit board is a passive buzzer, there is no circuit board and closed with a vinyl one is an active buzzer.
Burst a step to determine the active buzzer and passive buzzer, you can also use the multimeter resistance file rxl file test: black pen connected to the buzzer "+" pin, red pen on the other pin back and forth touch, if the trigger out of the click, click sound and the resistance of only 8ω is passive
Buzzer; if you can send out a sustained sound, and the resistance in the more than a few hundred ohms, is an active buzzer.
Active buzzer directly connected to the rated power supply can be continuous sound; and passive buzzer and electromagnetic speaker, need to be connected to the audio output circuit to sound.