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Oscillator
An oscillator is a circuit that creates a waveform output from a direct current input. The two main types of oscillator are harmonic and relaxation. The harmonic oscillators have smooth curved waveforms, while relaxation oscillators have waveforms with sharp changes.
How Oscillators Work
A basic oscillator is a capacitor and inductor connected together. As the capacitor discharges, the current creates a magnetic field in the inductor. When the capacitor is fully discharged, the field collapses and induces an opposite current that charges the capacitor again. This cycle continues until all the energy is lost through resistance. The frequency of the oscillations depends on the size of the capacitor and inductor.
Every component has some inherent electrical noise, and this noise provides the initial signal for an oscillator. The output noise is sent back to the input as feedback to be filtered and amplified. This process eventually turns the noise into a steady signal !!!!!
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