≥100 dB @30cm
-20 ～ +70 ℃
-30 ～ +80 ℃
how to identify the positive and negative charge direction of the buzzer?
Generally used for pronunciation of buzzer positive or negative can not be divided, if you want to use the sensor for the buzzer or positive and negative points out.
Positive is generally positive. You can use the pointer multimeter, with mechanical dial to 25V file, the left thumb and index finger gently pinch the buzzer on both sides of the right hand holding two pens, red pen close to the silver surface of the buzzer, black pen horizontal placed on the beep Piece of metal surface, and then the left thumb and forefinger forced squeeze, then relax, the buzzer on the chip will have two opposite polarity voltage signal, so that the pointer to the right to pendulum - back to zero - to the left - back to zero About 0.1 ~ 0.15V. In this case, the buzzer is the positive pole.
If the pointer swings in the order of left - return to zero - to the right - zero back. In this case, the buzzer is positive and under.
In the case of the same pressure, the greater the pointer swing, the higher the sensitivity of the buzzer.