What is Piezo Buzzer,Piezo audio indicator ?

The heart of piezo buzzers are a piezoelectric ceramic plate. Piezoelectric ceramics generate electricity when they experience mechanical force and, more important to a buzzer’s function, create force when exposed to an electric field. When the ceramic experiences an alternating voltage, the plate extends and shrinks. It is glued to a fixed metal plate so these forces cause the ceramic to flex, creating the buzzing sound.


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Piezo Audio Indicator HP3025XW Buzzer Datasheet: HP3025XW  PDF Datasheet Download Lead wire type  Internal-Driven (With oscillator circuit) Dia 30 x25mm  Worked with 12V DC , Output3.5K Hz 90dB at 10cm Type UNIT HP3025AXW HP3025BXW *Min. Sound Output at10cm dB 90 90 Rated Voltage VDC 12 12 Operating Voltage VDC 3~20 3~20 Resonant Frequency Hz 3500±500 3500±500 *Max. Current Consumption mA 10 10 Tone Nature Continuous Pulse 1-4Hz Operating Temperature °C -20～+70 Storage Temperature °C -30～+80 Weight g 13 Value applying at rated voltage  DIMENSIONS     Unit:mm     Tolerance:±0.5