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equipment, electronic production and microcontroller circuits, etc. .
From the exterior, two kinds of buzzer seems the same, but a closer look, a slight difference
between the height of the active buzzer a, height of 9mm, and passive buzzer b height of
8mm. When the buzzer as the two pins are facing up, you can see there is a green circuit
board is passive buzzer, no closed circuit boards with a vinyl is active buzzer .
Further determine the active and passive buzzer, you can also use a multimeter to test the
resistance profile Rxl file: buzzer with black pen then "+" pin, the red pen to touch on another
pin back and forth, if trigger a cracking, cracking sound and the resistance only 8Ω (or 16Ω)
is passive buzzer; If you can emit continuous sound, and the resistance in Europe and more
than a few hundred, and is an active buzzer.
Active buzzer directly connected to the rated power (new buzzer has stated on the label)
can be a continuous sound; rather passive electromagnetic buzzer and speaker are the
same, you need to take in order to sound the audio output circuit .
Connection
Schematic
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