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Chapter7 Buzzer

What’s buzzer?

The buzzer is one integrated electronic transducers, DC voltage supply, widely used in computers,

printers, copiers, alarm, electronic toys, automotive electronic equipment, telephones, timers

and other electronic products for sound devices.

They can be divided into the: active buzzer (containing driver line) and passive buzzer (external

drive) in their drive different way, teach you to distinguish between active buzzer and passive

buzzer. A small buzzer for sale on the market now because of its small size (diameter is only

11mm), light weight, low price, solid structure, while widely used in various electrical equipment

with sound, electronic production and microcontroller circuits. Appearance of active the buzzer

and passive buzzer like a, b shown. a) active b) passive.

From the figure a, b appearance watching, the two buzzers seems to the same, but a closer look,

the height of the two slight difference active buzzer a height of 9mm, passive buzzer b, a height