Piezo Discs

Piezoelectric ceramic buzzer is a piezoelectric ceramic chip application of a device. The more common is made of cobalt, lead oxide formulation after sintering of titanium, piezoelectric ceramic sheet (pzt), due to the human ear is most sensitive to 3khz audio signals, so the production of the resonance frequency of the beeper is usually designed in the resonance frequency of 3khz or so.