Views:3097 Author:kim Publish Time: 2019-07-16 Origin:Site
Buzzer is divided into two kinds, one is active and and another is passive. Active and passive buzzers are used to make sound for electronics.
The active buzzer has an internal oscillating source, and the buzzer will sound as soon as it is energized. The active buzzer is widely used in computers, printers, copiers, alarms, electronic toys, automotive electronics, telephones, timers and other electronic products for sounding devices.
The passive buzzer does not have an internal oscillating source, and it has to be driven with square wave and different frequency needed. It is like an electromagnetic speaker, where a changing input signal produces the sound, rather than producing a tone automatically.
The simple way to distinguish passive buzzer and active buzzer is to drive them with a battery. Connect positive and negative terminals properly with the battery, if the buzzer sounds, it is an active buzzer. If soundless, it is a passive buzzer.
Most passive buzzers have a small size. In the market, there are more passive buzzers than active buzzers since passive buzzers are less expensive than acrive buzzers.
A) The advantages of passive buzzer are:
2. The sound frequency is controllable and can emit different tone effects.
3. In some special cases, a control port can be multiplexed with the LED.
B) The advantages of the active buzzer are:
Program control is convenient, and direct DC power drive can sound.