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rystal is a solid in which the part atoms, molecules Coach Boots Outlet, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial proportions.
Object made of an elastic material could be used like a Crystal Coach Purses Outlet, with proper transducers, since all objects have natural resonant frequencies of vibration. For example, steel is very elastic and has a high speed of sound. The resonant frequency depends on size, shape, elasticity Coach Totes On Sale, and the speed of sound in the material. High-frequency crystals are typically cut in the shape of a simple, rectangular plate.
When a crystal of quartz is properly cut and mounted, it can be made to distort in an electric field by applying a voltage to an electrode near or on the Crystal . This property is known as piezoelectricity. When the field is removed, the quartz will result in an electric field as it returns to its previous shape, and this can generate a voltage.
The result is that a quartz crystal behaves like a circuit composed of an inductor, capacitor and resistor, with a specified resonant frequency. The specific characteristics will depend on the mode of vibration and the angle at which the quartz is cut. Therefore, the resonant frequency of the plate, which depends on its size, will not change much, either. This means that a quartz clock, filter or oscillator will remain accurate. For critical applications the quartz oscillator is mounted in a temperature-controlled container, called a crystal oven, and can also be mounted on shock absorbers to prevent flutter by external mechanical vibrations.
Application of Crystal Oscillator:
Used in real time clock
Allows binary division
Sound cards
Mini disc
CDROM devices
Used in USB (Universal Serial Bus)
Commonly used for down-conversion and sampling in GPS-receivers.
Used in CDMA system
Used in UART (Universal asynchronous receiver/transmitter)
Low frequency crystals used in Digital watches etc.
To Know:
Quartz timing crystals are manufactured for frequencies from a few tens of KHz to tens of MHz. More than two billion crystals are manufactured annually. Most are small devices for consumer devices.
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