Crystal resonator circuit sustains oscillation by taking a voltage signal from the quartz resonator, amplifying it, and feeding it back to the resonator. The rate of expansion and contraction of the quartz is the resonant frequency, and is determined by the cut and size of the crystal.
In operation the quartz crystal uses the piezo electric effect to convert the electrical signals to mechanical vibrations. These cause the crystal to vibrate and the mechanical resonances of the crystal then act on the mechanical vibrations.
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