Method 1:
Select according to the voltage.
The buzzer is generally driven by square wave (VP-P). The higher the voltage, the higher the volume.
Method 2:
Select according to the size.
It is also a common method to select the buzzer according to the size, mainly based on the principle that the size will affect the frequency. Generally, small size will have higher frequency.
Method 3:
Select according to the pin spacing.
Pin pitch can also be called Pinpitch. The reason for choosing according to this factor is that piezoelectric buzzers have many specifications, and it is often difficult to find identical specifications. In this case, we can try to use the same frequency as pitch.