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The frequency at which the crystal oscillates depends on its shape, size, and the crystal plane on which the quartz is cut. The positions at which electrodes are placed can slightly change the tuning as well. If the crystal is accurately shaped and positioned, it will oscillate at a desired frequency.
Synthetic sapphire crystal: the most scratch-resistant; it is difficult to cut and polish, causing watch crystals made of sapphire to be the most expensive. The bezel is the ring holding the crystal in place. [48] The lugs are small metal projections at both ends of the wristwatch case where the watch band attaches to the watch case. [48]
Russian Poljot "Siberia" model with finished Molnija movement, seen through a crystal back Molnija AChS-1 cockpit chronograph. Chelyabinsk Watch Factory "Molnija" (sometimes transliterated Molniya; Russian: Челябинский часовой завод) was a Russian watch and clockmaker based in Chelyabinsk, Chelyabinsk Oblast.
In modern quartz watches, the timekeeper is a quartz crystal in an electronic circuit, powering a small stepper motor. Because of the small amount of torque needed to move the hands, there is almost no pressure on the bearings and no real gain by using a jewel bearing, hence they are not used in a large proportion of quartz movements.
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A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. [1] [2] [3] The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.
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