A, the two principles are different:
1, the principle of the horn: the horn is actually a kind of electrical energy into sound of a conversion device, when different electronic energy to the coil, the coil produces a kind of energy and the magnet's magnetic field interaction, this interaction caused by the vibration of the paper plate, because the electronic energy changes at any time, the horn's coil will be forward or backward movement, so the horn's paper disk will be This action changes the air density and produces sound.
2, the principle of the buzzer: voltage buzzer piezoelectric buzzer is mainly composed of 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 is composed of transistors or integrated circuits. When the power supply (1.5 ~ 15V DC operating voltage), multi-harmonic oscillator vibration, output 1.5 ~ 2.5kHZ audio signal, impedance matching device to promote the piezoelectric buzzer sound.
Two, the two types of different:
1, the types of horns: including ribbon, horn, air cushion horn.
2, the types of buzzer: including active buzzer and passive buzzer.
Three, the overview of the two are different:
1, the overview of the horn: the horn is divided into several different kinds of musical instruments, a kind of wind instrument, the upper thin and the lower thick, mostly made of copper. Another is a modern electro-acoustic components, the role is to convert electrical signals into sound, also known as loudspeakers. It can also be used to describe a person who advocates and publicizes on behalf of others.
2, the buzzer's overview: the buzzer is an integrated structure of the electronic signal ringer, using DC voltage power supply, widely used in computers, printers, photocopiers, alarms, electronic toys, automotive electronics, telephones, timers, and other electronic products for the sound generator.
Expanded information:
Buzzer use precautions:
Buzzer can not be used as a ore radio, because, the buzzer has an internal oscillating circuit that drives a micro-speaker inside to emit a beep when power is applied. The buzzer is not a mere little horn. Also, there are two types of buzzers. One is, the one with its own internal oscillator; and one is, the one that requires an external oscillator, which is a regular 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 or 16 ohms. These are low impedance, so they won't work.
If there is no high-resistance headphones, you can also use a power transformer, generally 6V or 12V kind of power transformer, power selection of 3 to 5W or so of that kind, because of that kind of transformer, the primary wire diameter is very thin, the number of turns is also a lot of impedance is also very large. The purpose is to get a good impedance match for the load, so that the load gets the maximum power.
The way to use it is like this: connect the primary of the transformer to the original place where you want to connect the high-impedance headphones; connect the secondary to your normal headphones on it
Baidu Encyclopedia - Buzzer
Baidu Encyclopedia - Horn