A Simple Differentiation Method between Active Buzzer and Passive Buzzer
Time:
2023-06-13 22:21
Source:
The fundamental difference between an active buzzer and a passive buzzer is that the product has different requirements for input signals; The ideal signal for active buzzer operation is direct current, usually labeled as VDC, VDD, etc. Because there is a simple oscillation circuit inside the buzzer, which can convert a constant direct current into a pulse signal of a certain frequency, thereby achieving alternating magnetic fields and driving the aluminum plate to vibrate and sound. However, in some active buzzers, they can also work under specific AC signals, but have high requirements for the voltage and frequency of the AC signal, which is generally not used.
Passive buzzers do not have internal driving circuits, and some companies and factories refer to them as beepers, while in national standards, they are referred to as sounders. Ideal signal square wave for passive buzzer operation. If a DC signal is given, the buzzer will not respond because the magnetic circuit is constant and the molybdenum plate cannot vibrate and sound.
A Simple Method to Distinguish between Active Electromagnetic Buzzer and Passive Electromagnetic Buzzer
1、 Visual inspection:
Compare KS-12C01YE with KS-12D05YA, where "C" represents passive and "D" represents active;
The appearance of the former is 12 * 8.5, while the latter is 12 * 9.5, which are very similar. When placing the pins of the two types of buzzers facing upwards, it can be seen that the one with a green circuit board is a passive buzzer, and the one without a circuit board and sealed with black glue is an active buzzer.
However, this is only a preliminary criterion for judgment, not the only one. If KS-1240T2PA is added, the identification becomes even more complex. Its overall size is 12.5 * 6, which is the smallest piezoelectric passive buzzer on the market;
With the continuous development of the market, the requirements for quality are also increasing. Many manufacturers require bottom sealing for 12MM buzzers. In order to ensure stable performance and prevent adverse situations such as magnetic core detachment, visual inspection is only a preliminary identification method.
Here is another method——
2、 Multimeter testing:
Test with a multimeter resistance Rxl range: Connect the black lead to the buzzer "+" pin, and touch the red lead back and forth on the other pin. If a click or click is triggered and the resistance is only 8 Ω (or
16 Ω) is a passive buzzer; If a continuous sound can be emitted and the resistance is above a few hundred ohms, it is an active buzzer.
3、 DC voltage test;
The general voltage for a passive 12MM is 1.5V, while for an active electromagnetic buzzer, the general voltage is 1.5V, 3.05.0V, 9.0V, and 12V. The corresponding voltage can be input using a DC voltage (which can be adjusted from small to large), with a frequency of approximately 500Hz. The active electromagnetic buzzer that can sound directly needs a square wave, while the one that does not sound directly needs a square wave
The passive electromagnetic buzzer can only sound when driven.
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