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===Piezoelectric=== [[File:2007-07-24 Piezoelectric buzzer.jpg|thumb|Piezoelectric disk beeper]] A [[piezoelectric]] element may be driven by an [[Oscillation|oscillating]] electronic circuit or other [[audio signal]] source, driven with a [[piezoelectric audio amplifier]]. Sounds commonly used to indicate that a button has been pressed are a click, a ring or a beep. [[File:Buzzer interior.JPG|thumb|Interior of a readymade loudspeaker, showing a piezoelectric-disk-beeper (With 3 electrodes ... including 1 feedback-electrode ( the central, small electrode joined with red wire in this photo), and an oscillator to self-drive the buzzer.]] A piezoelectric buzzer/beeper also depends on acoustic cavity resonance or [[Helmholtz resonance]] to produce an audible beep.<ref>{{Cite web | url=http://www.puiaudio.com/resources-white-papers-helmholtz.aspx |title = Design of a Helmholtz Chamber - PUI Audio | A Projects Unlimited Company located in Dayton, Ohio}}</ref>
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