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Self-drive piezo
From ElectroDragon Wiki
供应 直径27mm铜片贴20瓷片 三极 自激式 反馈极压电陶瓷蜂鸣片
Other Buzzer
three electrode
三极压电陶瓷蜂鸣片的反馈量怎么测量啊
三级压电陶瓷在工作时,反馈极接一个47K可调电阻,使用你选定的标称电压值,让蜂鸣片工作,慢慢调整电位器直道蜂鸣器声音最响,但是要求总电流不准大于10-20mA(12V时),停止工作,使用万用表量一下47K电位器的阻值,就是此款蜂鸣片的反馈阻值
https://electronics.stackexchange.com/questions/18212/whats-the-third-wire-on-a-piezo-buzzer
https://www.hackster.io/taunoerik/self-drive-piezo-buzzer-e9786f
Category
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Buzzer