Waterproof Piezoelectric Buzzer Circuit 12 Volt 90dB Household
Sound pressure Level
90dB Min. at 12Vdc/30cm
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What’s the difference between piezo and magnetic?
A piezo buzzer generates sound because of the piezoelectric effect
from the piezoelectric ceramic which drives the metallic diaphragm
A magnetic buzzer is based on the electromagnetic principle, the
metal diaphragm is pulled when input the power, and spring back
How to distinguish active and passive buzzer?
An active buzzer will generate a tone using an internal oscillator,
so all that is needed is a DC voltage.
A passive buzzer requires an AC signal to make a sound.
To identify them, if you apply a DC voltage to them and it buzzes,
it's an active.
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