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07-10-2017, 11:35 PM

Please help. No idea about working model on lc oscillation please help me out.

jaseela123d · 11-10-2017, 04:13 PM

An oscillator is a circuit that produces a continuous, repeating and alternating waveform without any input. The oscillators basically convert the unidirectional current flow from a DC source into an alternating waveform that is of the desired frequency, as decided by their circuit components. The basic principle behind the operation of the oscillators can be understood by analyzing the behavior of an LC tank circuit shown in Figure 1, which employs an inductor L and a fully precharged capacitor C as its components. Here, first, the capacitor begins to discharge through the inductor, which results in the conversion of its electrical energy into the electromagnetic field, which can be stored in the inductor. Once the capacitor is fully discharged, there will be no current flow in the circuit. However, by then, the stored electromagnetic field would have generated a return force which results in the current flowing through the circuit in the same direction as before.

This flow of current through the circuit continues until the electromagnetic field collapses, which results in the electro-transformation of the electromagnetic energy in electrical form, causing the cycle to repeat itself. However, now the capacitor would have charged with the opposite polarity, due to which an oscillating waveform like the output is obtained.

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