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====Oscillator====
[[File:OpAmpHystereticOscillator.svg|thumb|A popular [[Relaxation oscillator#Comparator–based electronic relaxation oscillator|op-amp relaxation oscillator]]]]
An [[electronic oscillator]] is an [[electronic circuit]] that produces a periodic, [[oscillation|oscillating]] electronic signal, often a [[sine wave]] or a [[Square wave (waveform)|square wave]].<ref name="Snelgrove">{{cite encyclopedia
  | last = Snelgrove
  | first = Martin
  | title = Oscillator
  | encyclopedia = McGraw-Hill Encyclopedia of Science and Technology, 10th Ed., Science Access online service
  | publisher = McGraw-Hill
  | year = 2011
  | url = http://accessscience.com/abstract.aspx?id=477900&referURL=http%3a%2f%2faccessscience.com%2fcontent.aspx%3fid%3d477900
  | access-date = 1 March 2012
  | archive-url = https://web.archive.org/web/20130719125711/http://accessscience.com/abstract.aspx?id=477900&referURL=http%3A%2F%2Faccessscience.com%2Fcontent.aspx%3Fid%3D477900
  | archive-date = 19 July 2013
  | url-status = dead
  }}</ref><ref name="Chattopadhyay">{{cite book   
  | last = Chattopadhyay
  | first = D. 
  | title = Electronics (fundamentals And Applications)
  | publisher = New Age International
  | year = 2006
  | pages = 224–225
  | url = https://books.google.com/books?id=n0rf9_2ckeYC&q=%22negative+resistance%22&pg=PA224
  | isbn = 978-81-224-1780-7}}</ref> Oscillators convert [[direct current]] (DC) from a power supply to an [[alternating current]] signal.  They are widely used in many electronic devices.  Common examples of signals generated by oscillators include signals broadcast by [[Radio transmitter|radio]] and [[television transmitter]]s, clock signals that regulate computers and [[quartz clock]]s, and the sounds produced by electronic beepers and [[video game]]s.<ref name="Snelgrove" />

Oscillators are often characterized by the [[frequency]] of their output signal:
* A [[low frequency oscillation|low-frequency oscillator]] (LFO) is an electronic oscillator that generates a frequency below ≈20&nbsp;Hz.  This term is typically used in the field of audio [[synthesizers]], to distinguish it from an audio frequency oscillator.
* An audio oscillator<!--Please don't link – circular reference--> produces frequencies in the [[audio frequency|audio]] range, about 16&nbsp;Hz to 20&nbsp;kHz.<ref name="Chattopadhyay" />
* An RF oscillator produces signals in the [[radio frequency]] (RF) range of about 100&nbsp;kHz to 100&nbsp;GHz.<ref name="Chattopadhyay" />

Oscillators designed to produce a high-power AC output from a DC supply are usually called [[Inverter (electrical)|inverters]].

There are two main types of electronic oscillator: the linear or harmonic oscillator and the nonlinear or [[relaxation oscillator]].<ref name="Chattopadhyay" /><ref name="Garg">{{cite book   
  | last = Garg
  | first = Rakesh Kumar  
  | author2=Ashish Dixit |author3=Pavan Yadav
  | title = Basic Electronics
  | publisher = Firewall Media
  | year = 2008
  | pages = 280
  | url = https://books.google.com/books?id=9SOdnsHA2IYC&pg=PA280
  | isbn = 978-8131803028}}</ref>