Electronic oscillator

oscillatoroscillatorsaudio oscillatoroscillator circuitelectronic oscillatorsaudio frequency oscillatorsfeedback oscillatoroscillationaudio oscillatorselectronic oscillations
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.wikipedia
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Quartz clock

quartz watchquartzquartz movement
Common examples of signals generated by oscillators include signals broadcast by radio and television transmitters, clock signals that regulate computers and quartz clocks, and the sounds produced by electronic beepers and video games.
A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time.

Relaxation oscillator

relaxation oscillationrelaxation-oscillations
There are two main types of electronic oscillator – the linear or harmonic oscillator and the nonlinear or relaxation oscillator.
In electronics a relaxation oscillator is a nonlinear electronic oscillator circuit that produces a nonsinusoidal repetitive output signal, such as a triangle wave or square wave.

Synthesizer

synthesizerssynthsynths
A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator.
In the 1930s and 1940s, the basic elements required for the modern analog subtractive synthesizers — electronic oscillators, audio filters, envelope controllers, and various effects units — had already appeared and were utilized in several electronic instruments.

RC oscillator

twin-T oscillator
*In an RC oscillator circuit, the filter is a network of resistors and capacitors.
Linear electronic oscillator circuits, which generate a sinusoidal output signal, are composed of an amplifier and a frequency selective element, a filter.

Wien bridge oscillator

Common types of RC oscillator circuits are the phase shift oscillator and the Wien bridge oscillator.
A Wien bridge oscillator is a type of electronic oscillator that generates sine waves.

Hartley oscillator

Hartleyhartley oscillators
Typical LC oscillator circuits are the Hartley, Colpitts and Clapp circuits.
The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator.

Crystal oscillator

crystalquartz oscillatorquartz crystal
*In a crystal oscillator circuit the filter is a piezoelectric crystal (commonly a quartz crystal).
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency.

Low-frequency oscillation

LFOlow-frequency oscillatorlow frequency oscillator
A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator.
The primary oscillator circuits of a synthesizer are used to create the audio signals.

Positive feedback

positive feedback looppositivepositive feedback cycle
The most common form of linear oscillator is an electronic amplifier such as a transistor or operational amplifier connected in a feedback loop with its output fed back into its input through a frequency selective electronic filter to provide positive feedback.
The oscillation that can break out in a regenerative radio circuit is used in electronic oscillators.

Local oscillator

LOoscillator
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.
In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.

Signal generator

tone generatorwaveform generatorfrequency generator
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.
Such devices contain an electronic oscillator, a circuit that is capable of creating a repetitive waveform.

Colpitts oscillator

Colpitts
Typical LC oscillator circuits are the Hartley, Colpitts and Clapp circuits.
A Colpitts oscillator, invented in 1918 by American engineer Edwin H. Colpitts, is one of a number of designs for LC oscillators, electronic oscillators that use a combination of inductors (L) and capacitors (C) to produce an oscillation at a certain frequency.

Clapp oscillator

Clapp
Typical LC oscillator circuits are the Hartley, Colpitts and Clapp circuits.
The Clapp oscillator or Gouriet oscillator is an LC electronic oscillator that uses a particular combination of an inductor and three capacitors to set the oscillator's frequency.

Pierce oscillator

quartz crystal oscillators
Crystal oscillators often use the same circuits as LC oscillators, with the crystal replacing the tuned circuit; the Pierce oscillator circuit is also commonly used.
The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits.

Oscillation

oscillatorvibrationoscillators
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.
Electronic oscillator

Cavity magnetron

magnetronmagnetronssplit-anode magnetron
In addition to the feedback oscillators described above, which use two-port amplifying active elements such as transistors and operational amplifiers, linear oscillators can also be built using one-port (two terminal) devices with negative resistance, such as magnetron tubes, tunnel diodes, IMPATT diodes and Gunn diodes.
Unlike other vacuum tubes such as a klystron or a traveling-wave tube (TWT), the magnetron cannot function as an amplifier in order to increase the intensity of an applied microwave signal; the magnetron serves solely as an oscillator, generating a microwave signal from direct current electricity supplied to the vacuum tube.

Negative resistance

negative differential resistancecurrent filamentnegative impedance
In addition to the feedback oscillators described above, which use two-port amplifying active elements such as transistors and operational amplifiers, linear oscillators can also be built using one-port (two terminal) devices with negative resistance, such as magnetron tubes, tunnel diodes, IMPATT diodes and Gunn diodes.
They are used in electronic oscillators and amplifiers, particularly at microwave frequencies.

Surface acoustic wave

SAW[8filters
Other types of resonator, dielectric resonators and surface acoustic wave (SAW) devices, are used to control higher frequency oscillators, up into the microwave range.
SAW devices are used as filters, oscillators and transformers, devices that are based on the transduction of acoustic waves.

LC circuit

tuned circuitLCresonant circuit
Crystal oscillators often use the same circuits as LC oscillators, with the crystal replacing the tuned circuit; the Pierce oscillator circuit is also commonly used. *In an LC oscillator circuit, the filter is a tuned circuit (often called a tank circuit; the tuned circuit is a resonator) consisting of an inductor (L) and capacitor (C) connected together.
They are key components in many electronic devices, particularly radio equipment, used in circuits such as oscillators, filters, tuners and frequency mixers.

Gunn diode

gunnplexereffectGull effect
In addition to the feedback oscillators described above, which use two-port amplifying active elements such as transistors and operational amplifiers, linear oscillators can also be built using one-port (two terminal) devices with negative resistance, such as magnetron tubes, tunnel diodes, IMPATT diodes and Gunn diodes.
Its largest use is in electronic oscillators to generate microwaves, in applications such as radar speed guns, microwave relay data link transmitters, and automatic door openers.

Resonator

resonant cavityresonatorscavity resonator
*In an LC oscillator circuit, the filter is a tuned circuit (often called a tank circuit; the tuned circuit is a resonator) consisting of an inductor (L) and capacitor (C) connected together.
Cavity resonators are widely used as the frequency determining element in microwave oscillators.

Armstrong oscillator

ArmstrongArmstrong (or Tickler or Meissner) oscillatorArmstrong circuit
Armstrong oscillator, a.k.a. Meissner oscillator
The Armstrong oscillator (also known as the Meissner oscillator ) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation.

Dynatron oscillator

dynatrondynatron oscillationsTransitron
Dynatron oscillator
In electronics, the dynatron oscillator, invented in 1918 by Albert Hull at General Electric, is an obsolete vacuum tube electronic oscillator circuit which uses a negative resistance characteristic in early tetrode vacuum tubes, caused by a process called secondary emission.

Feedback

feedback loopfeedback loopsfeedback mechanism
The most common form of linear oscillator is an electronic amplifier such as a transistor or operational amplifier connected in a feedback loop with its output fed back into its input through a frequency selective electronic filter to provide positive feedback.
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.

Phase-shift oscillator

Dippy oscillatorphase shift oscillator
Common types of RC oscillator circuits are the phase shift oscillator and the Wien bridge oscillator.
A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output.