https://uk.rs-online.com/web/content/discovery/ideas-and-advice/how-do-piezo-buzzers-work
How Do Piezo Buzzers Work | RS
Piezo buzzers make sounds through vibrations when they're linked into an AC circuit. This guide explores the features and applications of piezoelectric buzzers.
how dopiezo buzzerswork
https://www.floydbell.com/
Floyd Bell - Piezo Alarms, Buzzers, and Audio Devices for Durable Industrial Machines