and speaker are the acoustic components that can generate sound, if you
just need sound to warn or remind, both of them are fine.
We divide buzzer into piezo and magnetic buzzer. There are some differences
in power consumption, dimension, frequency and drive method between piezo
and magnetic buzzer, however, both of them basically pull the SPL to the
highest at a certain frequent point in order to generate as high SPL as
possible in the small size. The SPL will be very low if it is not at the
resonance point, even 20dB difference. By the way, the sound of buzzer
is drove by square waves; therefore it is harsh to the human ears.
Micro speaker is drove by the sine waves, to compare with buzzer, the
sound is much more comfortable for us. However, the bandwidth is wider,
and the frequency is lower, therefore, the micro speaker’s SPL must be
lower than the buzzer with the same size, and also need enclosure to help
the low frequency, otherwise the sound will be very small.
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