4Passive components -> Crystal oscillator
  Quartz crystal oscillator, quartz resonator referred to as the crystal, which is the use of piezoelectric effect of the quartz crystal piece made of. When the frequency of the alternating electric field is the same as the natural frequency of the quartz crystal, the vibration becomes very strong, which is the response of the crystal resonant characteristics. With this feature, you can use quartz resonator instead of LC (coil and capacitor) resonant circuit, filter and so on. As the quartz resonator has a small size, light weight, high reliability, high frequency stability, etc., are used in household appliances and communications equipment.
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