Piezoelectric buzzer uses piezoelectric material, that is, when the piezoelectric material deforms due to external force, the piezoelectric material will generate electric charge. Similarly, piezoelectric materials will deform when energized.
The electromagnetic buzzer mainly uses the characteristics that the energized conductor will generate a magnetic field, and uses a fixed permanent magnet and the energized conductor to generate a magnetic force to push the tympanic membrane fixed on the coil.
Due to the different pronunciation principles of the two buzzers, the piezoelectric structure is simple and durable, but the tone is single, and the tone color difference is suitable for alarm and other equipment. The electromagnetic type is mostly used in voice, music and other equipment because of its good timbre.