Buzzer composition principle and positive and negative orientation identification

 Buzzer manufacturers to introduce you to the buzzer composition principle and positive and negative orientation identification:.

   Buzzer in buzzer is also called piezoelectric ceramic buzzer, which is one of the most widely used products in piezoelectric ceramics.

   The buzzer is the main part of the piezoelectric buzzer. The buzzer is made of lead zirconate titanate or lead niobate piezoelectric ceramic material. The ceramic sheet is coated with silver electrodes on both sides, polarized and aged, and then glued together with a brass or stainless steel sheet.

   The buzzer works on the principle of piezoelectric effect, and it produces mechanical vibration when an alternating voltage is applied to it; conversely, it also produces a voltage signal when a mechanical force is applied to it. Therefore, the piezoelectric ceramic buzzer can be adapted for use as a vibration sensor.

   The voltage signal generated by the piezoelectric ceramic buzzer when mechanical force is applied to it is very weak, so it should be connected to a voltage amplifier for use as a vibration sensor. Then how to identify the positive and negative charge orientation of the buzzer?

   Generally, the positive and negative of the buzzer can be used for pronunciation, but if the buzzer is to be used for induction, the positive and negative should be separated out.

   Generally, the positive pole is facing up. You can use a pointer multimeter, with mechanical dial to 25V file, the left thumb and index finger gently pinch the two sides of the buzzer, the right hand holds two pens, the red pen close to the silver side of the buzzer, the black pen across the metal surface of the buzzer, and then the left thumb and index finger pressure, then relax, the buzzer has produced two voltage signals of opposite polarity, so that the pointer to the right - back to zero - to the left - back to zero In this case, the buzzer is the positive pole.

   If the pointer oscillates in the order of swinging to the left - back to zero - swinging to the right - back to zero. In this case, the buzzer is positive over down. Under the same pressure, the greater the pointer swing, the higher the sensitivity of the buzzer.