Author：Fuxin Count：0 Date：2019-09-27
1. The buzzer is divided according to the principle of driving mode, which can be divided into: active buzzer (including drive circuit, also called self-excited buzzer) and passive buzzer (external drive, also called him Excited buzzer
2, buzzer can be divided into: DIP BUZZER (pin buzzer) and SMD BUZZER (patch buzzer) according to the package.
3, buzzer can be divided into: electromagnetic buzzer and piezoelectric buzzer according to different construction methods
4. Buzzer can be divided into: DC buzzer and AC buzzer according to different currents. Among them, DC is the most common piezoelectric buzzer, which uses piezoelectric material, that is, when it is subjected to external force. The piezoelectric material generates a charge when the electrical material is deformed. Also, the piezoelectric material deforms when energized.
The electromagnetic buzzer mainly uses the characteristics that the energized conductor generates a magnetic field, and a fixed permanent magnet and a current conducting conductor generate a magnetic force to push the tympanic membrane fixed on the coil. Due to the different pronunciation principle of the buzzer, the piezoelectric buzzer is simple and durable in structure but has a single tone and is suitable for use in alarms and the like. The electromagnetic buzzer is mostly used for voice, music and other equipment because of its good tone.
