Microbuzzer.com · Posted on 07-08-2010 by microbuzzer

Magnetic buzzer easy way to active and passive

First, visual: the former is very similar form as the county upwards of two buzzer pin placement, you can see the green circuit board is a passive buzzer, no circuit boards with vinyl A buzzer is active closed. However, this is only the preliminary judging criteria, but not the only criteria. With the continued development of the market need for quality requirements are increasing, many manufacturers now need to 12MM buzzer need Dibu sealing compound, Wen Ding sake of its performance and prevent core loss and other undesirable situation and so, visual preliminary identification method.

Here’s another way

Second, multimeter test: resistance with a multimeter test file Rxl file: buzzer with a black sheet document access “+” pin, red table pen back and forth to touch the other pins, if the trigger a cracking, cracking sound and the resistance only 8Ω (or 16Ω) is passive buzzer; if given continuous sound, and the resistance of a few hundred more than in Europe, is active buzzer.

3, DC voltage test; general 12MM general passive voltage 1.5V, active magnetic buzzer general voltage 1.5,3.0,5.0,9.0,12 V, corresponding with DC voltage input voltage (which can be transferred to large from small ), frequency about 2.7KHZ, can ring for active magnetic buzzer, does not directly affect the need to drive a square wave can ring for passive magnetic buzzer.

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