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Question

How does an LC oscillator work?


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Solution

Explanation:

  1. Radio and TV are major applications for LC oscillator circuits. A tank circuit with a capacitor (C) and an inductor (L) is used by an LC oscillator.
  2. The capacitor is charged when voltage is applied to the LC circuit, and when the battery supply is interrupted, the capacitor's stored energy is discharged to the inductor.
  3. The inductor uses this energy to create a magnetic field around itself until the capacitor is completely depleted. After the capacitor is completely discharged, the magnetic field around the inductor collapses, producing a voltage that charges the capacitor with opposite polarity. Then this cycle is repeated.
  4. Oscillations are caused by charge and discharge between the capacitor and the inductor.

Therefore, the LC Oscillator is a "Sinusoidal Oscillator," or a "Harmonic Oscillator," as it is more frequently known. When using a bipolar transistor or field-effect transistor (FET) as the transistor amplifier, LC oscillators can produce high-frequency sine waves for usage in RF applications.


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