Colpitt's oscillator circuit diagram.
Electronic oscillator
An electronic oscillator is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave.
There are two main types of electronic oscillator: the harmonic oscillator and the relaxation oscillator.
A piezoelectric crystal may be coupled to the filter to stabilise the frequency of oscillation, resulting in a crystal oscillator.
There are many ways to implement harmonic oscillators, because there are different ways to amplify and filter. For example:
Types of Electronic Oscillator Harmonic Oscillator
The harmonic oscillator produces a sinusoidal output. The basic form of an harmonic oscillator is an electronic amplifier with the output attached to an electronic filter, and the output of the filter attached to the input of the amplifier. When the power supply to the amplifier is first switched on, the amplifier's output consists only of noise. The noise travels around the loop, being filtered and re-amplified until it increasingly resembles the desired signal.
Square-wave relaxation oscillators can be used to provide the clock signal for sequential logic circuits such as timers and counters, although crystal oscillators are often preferred for their greater stability.
Triangle-wave or sawtooth oscillators are used in the timebase circuits that generate the horizontal deflection signals for cathode ray tubes in analogue oscilloscopes and television sets.
The multivibrator is another type of relaxation oscillator.