Continuous tone DC type piezo buzzer Φ30*15mm for ultrasonic
Piezo buzzer is based on the inverse principle of piezo electricity
discovered in 1880 by Jacques and Pierre Curie. It is the phenomena
of generating electricity when mechanical pressure is applied to
certain materials and the vice versa is also true. Such materials
are called piezo electric materials. Piezo electric materials are
either naturally available or manmade. Piezo ceramic is class of
manmade material, which poses piezo electric effect and is widely
used to make disc, the heart of piezo buzzer. When subjected to an
alternating electric field they stretch or compress, in accordance
with the frequency of the signal thereby producing sound.
• They feature extremely low power consumption in comparison to
• Because these buzzers are designed for external excitation, the
same part can serve as both a musical tone oscillator and a buzzer.
• They can be used with automated inserters.Moisture-resistant
models are also available. The lead wire type with both-sided
adhesive tape installed easily is prepared.
Confirmation of user input (ex: mouse click or keystroke)
|Sound output at 30cm||dB||≥85||≥88||≥90|
Difference between piezo buzzer & magnetic buzzer:
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
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
| ||Piezo buzzer||Magnetic buzzer|
|Start method||Piezoelectric effect||Electro-magnetic effect|