The difference between a buzzer and a speaker, the difference between a buzzer and a buzzer

Summary. Hello dear, glad to answer for you. The difference between a pro buzzer and a buzzer light.

Hello dear, glad to answer for you. The difference between a pro buzzer and a buzzer light.

Difference 1, the difference in composition: the buzzer is mainly divided into piezoelectric and electromagnetic type, of which the piezoelectric buzzer will use piezoelectric buzzer inside. 2. The difference between piezoelectric buzzer and buzzer is that one has a shell and the other does not.

The buzzer belongs to the piezoelectric ceramic element The piezoelectric buzzer in the buzzer belongs to the piezoelectric acoustic device. 3. Buzzer is an electronic signal with integrated structure, which is powered by DC voltage, and is 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.).

First, the principle of the two is different:

1. The principle of the horn: the horn is actually a kind of conversion equipment that converts electrical energy into sound, when different electronic energy is transmitted to the coil, the coil produces an energy interaction with the magnetic field of the magnet, which causes the paper disc to vibrate, because the electronic energy changes at any time, the coil of the horn will move forward or backward, so the paper disc of the horn will follow the movement, which makes the air density change and produce sound.

2. The principle of buzzer: voltage buzzer Piezoelectric buzzer is mainly composed of multivibrator, piezoelectric buzzer, impedance matcher, resonance box, shell, etc. Some piezoelectric buzzers are also equipped with light-emitting diodes on their housings.

A multivibrator consists of a transistor or integrated circuit. When the power is turned on (DC working voltage), the multivibrator vibrates, and the output audio signal, the impedance matcher pushes the piezoelectric buzzer to sound.

Second, the types of the two are different:

1. Types of horns: including ribbons, horns, air cushion horns, etc.

2. Types of buzzers: including active buzzers and passive buzzers.

Third, the overview of the two is different:

1. Overview of the horn: The horn is divided into several different musical instruments, a kind of wind instrument, which is thin at the top and thick at the bottom, and is mostly made of copper. The other is a modern electroacoustic element, which is used to convert electrical signals into sound, also called loudspeakers. It can also be used to describe a person who advocates and propagandizes for others.

2. Overview of buzzer: 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.

１.Buzzers are generally high-impedance, with infinite DC resistance and large AC impedance, and narrow-band sounding devices are usually sounded by piezoelectric ceramic sheets. A large voltage is required to drive, but the current is small, a few mA is fine. The power is also very small.

Active buzzer with oscillation, driving circuitry inside. Add the power and it will ring, and that's probably what you're talking about. The advantage is that it is easy to use, and the disadvantage is that the frequency is fixed, and there is only one single tone.

Passive buzzers, like horns, need to be added with alternating audio voltage to make sounds, and can also emit sounds of different frequencies. However, the sound of the buzzer is not good anyway, so it is often added with a square wave instead of a sine added.

The horn is low resistance, the DC resistance is almost 0, and the AC impedance is generally a few ohms to more than ten ohms. Wideband sound emitting devices usually use the electromagnetic force of a coil to propel a diaphragm to emit sound.

The loudspeaker is a large one, which is generally used for audio, and the buzzer is a small one, which is generally used on the circuit board.

The biggest difference is that the buzzer shorting will beep, and the horn shorting will not.

Buzzers are widely used in 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 industries, environmental monitoring.

Since the self-excited buzzer is driven by DC voltage, it does not need to use AC signal to drive, only need to output the drive level of the drive port and amplify the driving current through the triode to make the buzzer make a sound. Only the other buzzer that must be driven by a square wave signal of 1 2duty is explained here.

There are two ways for the single-chip microcomputer to drive the other excitation buzzer: one is to drive the PWM output port directly, and the other is to use the IO timing to flip the level to generate a driving waveform to drive the buzzer.

PWM output port direct drive is to use the PWM output port itself can output a certain square wave to directly drive the buzzer. In the software settings of the microcontroller, there are several system registers that are used to set the output of the PWM port, and you can set the duty cycle, period, and so on.

After setting these registers to generate a waveform that meets the frequency required by the buzzer, the PWM output can output a square wave of that frequency by turning on the PWM output, and the buzzer can be driven by using this waveform.

For example, the driver of a buzzer with a frequency of 2000Hz can know that the period is 500 s, so you only need to set the period of PWM to 500 s and the duty cycle level to 250 s, you can generate a square wave with a frequency of 2000Hz, and then use the triode to drive the buzzer through this square wave.

The way of using the time to flip the level to generate the driving waveform will be more troublesome, and the timer must be used to do the timing, and the waveform that meets the frequency requirements of the buzzer can be used to drive the buzzer by timing the flip level.

For example, for the drive of a 2500Hz buzzer, it can be known that the period is 400 s, so that only the i o port of the buzzer needs to be driven every 200 s to flip the level to generate a square wave with a frequency of 2500Hz and a duty cycle of 1 2duty, and then the buzzer can be driven by triode amplification.

Buzzers are widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, machines, timers and other electronic products as sound devices.

Buzzer (English buzzer) is an electronic signal device with integrated structure, which is a kind of electronic components, and is powered by DC voltage or AC voltage.

Voltage buzzer Piezoelectric buzzer is mainly composed of multiple vibrators, piezoelectric buzzers, impedance matchers, resonance boxes, shells, etc. Some piezoelectric buzzers are also equipped with light-emitting diodes on their housings. Electromagnetic buzzer The electromagnetic buzzer is composed of an oscillator, an electromagnetic coil, a magnet, a vibrating diaphragm and a shell.

The buzzer is connected to the current (AC or DC buzzer is connected to the corresponding current and voltage), and it will emit the sound that comes with the buzzer, which is generally used for prompts and warnings, such as in the security system.