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There are two types of buzzers,
piezo and magnetic type.
A piezo buzzer generates sound because of the piezoelectric effect from
the piezoelectric ceramic which drives the metallic diaphragm to vibrate.
A magnetic buzzer is based on the electromagnetic principle, the metal
diaphragm is pulled when input the power, and spring back without power.
The piezo buzzer is driven by square waves, and the magnetic buzzer needs
1/2 square waves to drive.
We suggest inputting higher voltage for a piezo buzzer, normally over
9V to have enough SPL. On the other hand, a magnetic buzzer can be driven
to generate 85 dB by only 1.5V, but the consumption of the current will
be much higher than Piezo one.
To compare the two types of buzzers, the magnetic type can have lower
frequency response with the same dimension.
Though being limited by the dimension, the SPL of a magnetic buzzer can
only reach to 90 dB. The piezo buzzer can achieve the SPL of 120 dB in
some spec., some larger size can also easily reach to 100 dB.
| |
P i e z o B u z z e r |
M a g n e t i c B u
z z e r |
| S t a r t M e t h o d |
P i e z o e l e c t r i c e f
f e c t |
E l e c t r o - m a g n e t i
c e f f e c t |
| S i z e |
B i g
(10-50mm) |
S m a l l
(6-25mm) |
| R e s o n a n t F r e q u e n c y |
H i g h
(2-6KHz) |
L o w (1-3KHz) |
| O p e r a t i n g V o l t a g e |
H i g h
(9-24V) |
L o w (1.5-12V) |
| S o u n d L e v e l |
L o u d e r
(85-120dB) |
L o w e r
(70-95dB) |
| C u r r e n t C o n s u m p t i o n |
L o w
(5-20mA) |
H i g h (35-60mA) |
+886 2 8866-5255 ext. 200 Michael Mail
us / Gmail |
