
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly used to keep track of time (as in quartz wristwatches), to provide a stable clock signal for digital integrated circuit...
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http://en.wikipedia.org/wiki/Crystal_oscillator

[
n] - an oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal
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http://www.webdictionary.co.uk/definition.php?query=crystal%20oscillator
quartz oscillator noun an oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal
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https://www.encyclo.co.uk/local/20974
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