Buzzer, also known as piezoelectric ceramic buzzer, is one of the most widely used products in piezoelectric ceramics. Buzzer is the main component of the piezoelectric buzzer.
The composition of buzzing chips is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramics. Silver electrodes were plated on both sides of the ceramic sheet, then polished and aged, and then bonded to the brass or stainless steel sheet.
The principle of buzzer: buzzer is based on the principle of piezoelectric effect, when applied alternating voltage, it will produce mechanical vibration; otherwise, when applied mechanical force, it will also produce voltage signal. Therefore, piezoelectric ceramic buzzer can be used as a vibration sensor. The voltage signal produced by the piezoelectric ceramic buzzer is very weak when it is subjected to the mechanical force. As a vibration sensor, the voltage amplifier should be connected generally.
The quality discrimination of buzz films: mechanical multimeter can easily detect the quality of buzz.
Put the multimeter to 25V. Hold the two sides of the buzzer gently with your left thumb and forefinger. Hold the two pens in your right hand. The red pen is close to the chips. The black pen is placed across the surface of the buzzer. Press the left thumb and forefinger together. Then relax. The buzzer produces two voltage signals which are opposite polarity. Swing to the right - return to zero - left swing back to zero, swing about 0.1~0.15V. If the position of the pen is exchanged for re examination, the order of pointer swing is left to swing - zero to right swing to zero. Under the same pressure, the greater the swing of the needle, the higher the sensitivity of the buzzer tablet. If the needle does not move, it means that the buzzer tablet internal leakage or damage.
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