SMD Type 3.6V Passive Magnetic Buzzer For Warning Tone Handheld
Terminal 85 dB Output
Sound output at 10cm
Tell you how to choose a buzzer.
Here’re many different kinds of buzzer to choose.Firstly we need to
know a few parameters, such as voltage, current, drive method,
dimension, mounting type, and the most important thing is how much
SPL and frequency we want.
Operating voltage: Normally, the operating voltage for a magnetic buzzer is from 1.5V
to 24V, for a piezo buzzer is from 3V to 220V. We suggest you at
least 9V to drive a piezo buzzer.
Consumption current: According to the different voltage, the consumption current of a
magnetic buzzer is from dozens to hundreds of mill
amperes.Oppositely, the piezo type saves much more electricity,
only needs a few mill amperes, and consumes three times current
when the buzzer start to work.
Driving method: Because of the internal set drive circuit, the self-drive buzzer
can emit sound as long as connecting with the direct current. Due
to the different work principle, the magnetic buzzer need to be
driven by 1/2 square waves, and the piezo buzzer need square waves
to get better sound output.
Dimension: The dimension of the buzzer affects its SPL and the frequency, the
dimension of the magnetic buzzer is from 7 mm to 25 mm; the piezo
buzzer is from 12 mm to 50 mm, or even bigger.
Connecting way: Wire type, SMD type, and pin type for piezo buzzer are usually
SPL: Buzzer is usually tested the SPL at the distance of 10 cm.If
distance is double, the SPL will decay about 6 dB.Oppositely, the
SPL will increase 6 dB when the distance is shortened by one time.
The SPL of the magnetic buzzer can reach to around 85 dB/ 10 cm;
the piezo buzzer can be designed to emit very loud sound.For
example, the common siren, are mostly made of piezo buzzer.