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Overview

oscillator

An electronic device that produces an alternating output of known frequency. If the output voltage or current has the form of a sine wave with respect to time, the device is called a ...

Oscillator

Oscillator   Reference library

The Grove Dictionary of Musical Instruments (2 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Music
Length:
81 words

...Oscillator . Electronic circuit that generates a single periodic waveform. Linear or harmonic oscillators produce a sinusoidal output, while non-linear or relaxation oscillators produce a non-sinusoidal output such as a sawtooth, square, or triangle wave. Audio oscillators produce frequencies in the audio range (16 Hz to 20 kHz), RF oscillators in the radio frequency range (100 kHz to 100 GHz), and LFO (low frequency oscillators) produce frequencies below 20 Hz. For the independent use of oscillators as musical instruments, see Electronic instruments...

oscillator

oscillator   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

... An electronic circuit that switches back and forth between states. Oscillators are mainly used to provide clock signals or a frequency reference, in which applications they are normally crystal controlled. A specialized form is the VCO ( voltage controlled oscillator ) in which the frequency may be modified within limits by a control voltage, the free-running frequency being determined by external...

oscillator

oscillator   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
33 words

... A device for producing electrical oscillations (vibrations), such as sound waves, as in sonar or an ultrasonic generator. In electronics, an oscillator circuit converts direct current ( DC ) into high-frequency alternating current ( AC...

oscillator

oscillator   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
20 words

... an instrument or device for producing oscillations, especially an electronic device that produces an alternating output of known...

oscillator

oscillator   Quick reference

The Oxford Dictionary of Music (6 ed.)

Reference type:
Subject Reference
Current Version:
2013
Subject:
Music
Length:
21 words

... That part of electrical generator that produces a repetitive waveform. The term is sometimes used to mean the whole...

oscillator

oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
495 words
Illustration(s):
3

... oscillator with transformer feedback The frequency-determining device may consist of a component, such as a piezoelectric or magnetostrictive crystal, that converts mechanical stress into electrical impulses; alternatively such a device may be coupled to the resonant circuit to prevent frequency drift. Colpitt’s oscillator and the phase-shift oscillator are shown in Figs. c and d . (c) Colpitt’s oscillator: common emitter (d) Phase-shift oscillator http://electronics.howstuffworks.com/oscillator.htm An introduction to oscillators, on the...

oscillator

oscillator   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...oscillator A mechanical or electrical device the output of which is a quantity which varies periodically with time, such as the displacement of a component or a...

oscillator

oscillator   Reference library

John Borwick

The Oxford Companion to Music

Reference type:
Subject Reference
Current Version:
2011
Subject:
Music
Length:
29 words

...oscillator . An electronic circuit designed to produce a stream of electric vibrations which can be fed to a loudspeaker to emit sound waves. See electronic musical instruments . John...

oscillator

oscillator   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
137 words

...oscillator An electronic device that produces an alternating output of known frequency. If the output voltage or current has the form of a sine wave with respect to time, the device is called a sinusoidal (or harmonic ) oscillator . If the output voltage changes abruptly from one level to another (as in a square wave or sawtooth waveform ) it is called a relaxation oscillator . A harmonic oscillator consists of a frequency-determining circuit or device, such as a resonant circuit , maintained in oscillation by a source of power that by positive...

sawtooth oscillator

sawtooth oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...oscillator A relaxation oscillator that produces a sawtooth waveform . ...

squegging oscillator

squegging oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...oscillator A type of oscillator in which the main oscillations output from it alter the electrical conditions of the oscillator circuit so that the output amplitude periodically builds up to a peak value and then falls to zero. The blocking oscillator is a special type of squegging oscillator and is frequently used as a pulse generator for use, for example, in radar systems. ...

Hartley oscillator

Hartley oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
78 words
Illustration(s):
2

...oscillator A type of oscillator consisting of a transistor with common-emitter connection and a parallel resonant circuit between the emitter and collector (see diagram). Ignoring the resistance of the coil the resonant frequency, , is given by Hartley oscillators may also be crystal-controlled ( see piezoelectric oscillator , Fig. d ). Hartley oscillator ...

harmonic oscillator

harmonic oscillator   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
93 words

...oscillator A system that oscillates with simple harmonic motion. The harmonic oscillator is exactly soluble in both classical mechanics and quantum mechanics. Many systems exist for which harmonic oscillators provide very good approximations. Atoms vibrating about their mean positions in molecules or crystal lattices at low temperatures can be regarded as good approximations to harmonic oscillators in quantum mechanics. Even if a system is not exactly a harmonic oscillator the solution of the harmonic oscillator is frequently a useful starting point for...

harmonic oscillator

harmonic oscillator   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
115 words

...harmonic oscillator A system (in either classical physics or quantum mechanics ) that oscillates with simple harmonic motion . The harmonic oscillator is exactly soluble in both classical mechanics and quantum mechanics. Many systems exist for which harmonic oscillators provide very good approximations. An example in classical mechanics is a simple pendulum , while at low temperatures atoms vibrating about their mean positions in molecules or crystal lattices can be regarded as good approximations to harmonic oscillators in quantum mechanics. Even if a...

blocking oscillator

blocking oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...oscillator A type of oscillator in which blocking occurs after completion of (usually) one cycle of oscillation and lasts for a predetermined time. The whole process is then repeated. Fundamentally it is a special type of squegging oscillator and has applications as a pulse generator and a timebase generator . ...

anharmonic oscillator

anharmonic oscillator   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
55 words

...oscillator An oscillating system (in either classical mechanics or quantum mechanics ) that is not oscillating in simple harmonic motion. In general, the problem of an anharmonic oscillator is not exactly soluble, although many systems approximate to harmonic oscillators and for such systems the anharmonicity can be calculated using perturbation theory...

master oscillator

master oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...oscillator An oscillator of extremely high inherent frequency stability that is used to drive a power amplifier in order to supply a substantial power output to the load. This arrangement is used where substantial output power is required with a high degree of frequency stability, as in the generation of a carrier wave , since the frequency of an oscillator is partially dependent on the load supplied by it. The master oscillator ‘sees’ a constant load from the buffer between it and the multistage power amplifier and hence the frequency stability is...

anharmonic oscillator

anharmonic oscillator   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
86 words

...anharmonic oscillator An oscillating system (in either classical physics or quantum mechanics ) that is not oscillating in simple harmonic motion . In general, the problem of an anharmonic oscillator is not exactly soluble, although many systems approximate to harmonic oscillators, and for such systems the anharmonicity (the deviation of the system from being a harmonic oscillator ) can be calculated using perturbation theory . If the anharmonicity is large, other approximate or numerical techniques have to be used to solve the...

neuronal oscillator

neuronal oscillator n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...oscillator n . The neural circuitry underlying the execution of any rhythmic activity, such as walking or running, chewing, or (in airborne species)...

piezoelectric oscillator

piezoelectric oscillator   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
395 words
Illustration(s):
4

...in various ways to an oscillator circuit. The circuits used may be classified into two main types. In the crystal oscillator the crystal replaces the tuned circuit in the oscillator and thus provides the resonant frequency ( Fig. a ); the Pierce crystal oscillator is an example ( Figs. b , c ). (a) Basic piezoelectric oscillator (b) Pierce crystal oscillator with crystal between base and collector (c) Pierce crystal oscillator using a FET In the crystal-controlled oscillator the crystal is coupled to the oscillator circuit, which is tuned...

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