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| [[Image:Oscillator Colpitts 1920.svg|thumb|right|Early schematic of a Colpitts circuit, using ...ith a [[capacitor]] (C) for frequency determination, thus also called [[LC oscillator]]. The distinguishing feature of the Colpitts circuit is that the [[feedba

A '''voltage-controlled oscillator''' or '''VCO''' is an [[electronic oscillator]] designed to be controlled in [[oscillation]] [[frequency]] by a [[voltage ...l Microwave VCO.png|thumb|right|A microwave (12-18 GHz) Voltage Controlled Oscillator]]

[[Image:Wein Bridge Oscillator.png|right|thumb|300px|In this version of the oscillator, Rb is a small incandescent lamp. Usually R1 = R2 = R and C1 = C2 = C. In n ...ates [[sine wave]]s. It can generate a large range of [[frequencies]]. The oscillator is based on a [[bridge circuit]] originally developed by [[Max Wien]] in 18