≥95 dB @30cm
-20 ～ +70 ℃
-30 ～ +80 ℃
Simple distinction between active buzzer and passive buzzer
The fundamental difference between an active buzzer and a passive buzzer is that the product does not require the same input signal; the ideal signal for active buzzer operation is DC, usually labeled VDC, VDD, and so on. Because the buzzer has a simple internal oscillating circuit, the constant DC power can be converted into a pulse signal with a certain frequency, and the magnetic field alternates from the surface to drive the vibration of the molybdenum plate. However, some active buzzers can work under specific AC signals, but only require high voltage and frequency of AC signals. Such methods are generally not used.
Passive buzzers do not have an internal driver circuit. Some companies and factories call them sniffers, which are called sounders in the national standard. The ideal signal for a passive buzzer is a square wave. If you give DC
Signal buzzer is not responsive, because the magnetic circuit is constant, molybdenum film can not vibrate pronunciation.
A simple way to distinguish between active and passive electromagnetic buzzers
First, visual inspection:
Compare KS-12C01YE with KS-12D05YA, where "C" represents passive and "D" represents active;
The former shape is 12 * 8.5, the latter is 12 * 9.5, the two are very similar, such as the two buzzer pins upwards, you can see a green board is a passive bee A kind of active buzzer that is sealed with vinyl without a circuit board.
However, this is only the initial standard of judgment, not the only one. If coupled with the KS-1240T2PA that even more complex identification, and its dimensions are 12.5 * 6, this is the smallest piezoelectric passive buzzer on the market today;
With the continuous development of the market, the quality requirements are also getting higher and higher, many manufacturers now need 12MM buzzer bottom of the plastic, in order to stabilize its performance and prevent the core from falling off and other adverse conditions, so visual inspection Just a preliminary identification method.
Here's another way -
Second, multimeter test:
Test with a multimeter resistance file Rxl file: Connect the buzzer "+" pin with a black pen, the red pen touches the other pin back and forth, and if it triggers a click, clicks and the resistance is only 8Ω (or
16Ω) is a passive buzzer; if you can send a sustained sound, and resistance in the hundreds of Europe or more, is the active buzzer.
Third, the DC voltage test;
General 12MM passive general voltage is 1.5V, the general electromagnetic active buzzer voltage 1.5,3.0,5.0,9.0,12 V, with the DC voltage input voltage (which can be minor to large), the frequency of about 2.7KHZ , You can directly ring the active electromagnetic buzzer, does not ring, need square wave
To drive can be a passive electromagnetic buzzer.