Yes, now I can recall that a long time ago (during my school days), there’s some funny electronic birthday greeting cards and photo albums start playing little melodies through a thin piezoelectric speaker when opened up. It’s the key component of the piezoelectric ‘speaker’ commonly used in musical greeting cards, talking key chains, electronic toys, and gifts. In practice, piezo ceramic disc/element with a cavity encase will produce much higher acoustic output when compared to an ordinary one without the case.Īccording to Chinese web documentation, the piezoceramic disc is also known as “beep film” which is one of the most used piezoelectric ceramics. Next is a quick snip off from the official datasheet of a 27mm Ø piezo ceramic disc with a cavity encase. So piezo can be used both to play tones and to detect tones. The piezo effect works both ways – if you apply a voltage the piezo stretches, and if it stretches it creates a voltage. First off, thanks to the development of manmade piezo materials – piezoelectric ceramics, in particular! Piezo Ceramic Disc/Piezoelectric Speaker/Passive Piezo Buzzer…
Here, my humble intention is to provide a few practical hints linked up with the common piezo ceramic discs. Now we also know that electrostatic stress produces a change in the linear dimensions of the crystal. So just note down that the term piezoelectric effect pertains to electricity produced by mechanical pressure on certain crystals, notably quartz or Rochelle salt. Dating all the way back to 1880, the innovative work of brothers Pierre and Jacques Curie, the piezoelectric effect refers to the ability of particular materials to create an electric charge when subjected to mechanical stress. The term piezo can trace its roots back to ancient Greek, where its significations refer to activities of pressing, pushing, and squeezing. Nowadays, the applications of piezoelectricity in everyday electronic devices are growing at an exciting pace.
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