Question

Explain the basic principle involved in sinusoidal oscillator

Answer 1

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It may be used to generate AC waveforms such as sinusoidal, rectangular or sawtooth depending upon the type of oscillators used. They have wide range of applications such as in radios, Televisions, communication systems, computers, industrial controlled applications, and laboratories, as a function or signal generator.

There are many types of electronic oscillators, but they all operate according to the same basic principle: an oscillator always employs a sensitive amplifier whose output is fed back to the input in phase. Thus, the signal regenerates and sustains itself. This is known as positive feedback.

Oscillators designed to produce a high-power AC output from a DC supply are usually called inverters. There are two main types of electronic oscillator – the linear or harmonicoscillator and the nonlinear or relaxation oscillator.

These oscillators work on a different principle to sine wave oscillators. They produce a square wave or pulsed output and generally use two amplifiers, and a frequency control network that simply produces a timing delay between two actions.

LC oscillators are often used at radio frequencies, when a tunable frequency source is necessary, such as in signal generators, tunable radio transmitters and the local oscillators in radio receivers. Typical LC oscillator circuits are the Hartley, Colpitts and Clapp circuits.

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