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Crystals, also called piezoelectric crystals, are electronic devices which generate electrical oscillations of a certain frequency. The devices consist of a thin sheet of quartz crystal, to which two electrical contacts are connected. Because of its material properties, under the influence of applied AC voltages the quartz performs precisely defined oscillations. To achieve this, the natural frequency of the crystal must match the frequency of the AC voltage. Because of this constant frequency, quartz oscillators are used for instance in quartz clocks or in master clocks for computers.

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