Can you understand the structure and characteristics of piezoelectric buzzers?, Today, in order to help everyone remember what was said yesterday, let's talk about the differences between piezoelectric buzzers and electromagnetic buzzers to give you a more practical understanding of the properties of the two buzzers.
Due to the different type specifications of buzzers, we can only use a few important parameters (voltage, current, driving mode, size,/fixed connection method) for comparison. Of course, what is more important is good sound pressure and frequency
Working voltage: ranging from 1.5 to 24, electromagnetic buzzers and piezoelectric buzzers are feasible from 3 to 220, but generally piezoelectric or recommended voltage above 9 achieves loud sound.
Current consumption: The electromagnetic type varies from tens to hundreds of milliamps depending on the voltage, while the piezoelectric type is much more energy-efficient. It can operate normally with just a few milliamps and consumes about three times the current instantly when the buzzer starts,
Drive mode: Both types of buzzers have self-excited type, which can produce sound as long as direct current (DC) is connected. Because the built-in drive circuit is already in the buzzer, due to the different operating principles, electromagnetic buzzers need to be driven by 1/2 square wave, while piezoelectric buzzers need square wave to have better sound output
Size: The size of the buzzer will affect the volume and frequency, with electromagnetic ranging from 7mm to 25mm and piezoelectric ranging from 12mm to 50mm or more
Connection methods: Common methods include DIP, wire, SMD, piezoelectric large chips, and locking screws
Sound pressure: Buzzers are often tested at a distance of 10cm. Doubling the distance will result in a 6dB attenuation, while doubling the distance will result in a 6dB increase. Electromagnetic buzzers can reach a level of approximately 85dB/10cm, while piezoelectric buzzers can be made very loud. Common alarm devices are mostly made of piezoelectric buzzers.
