Variable-frequency oscillator
Oscillator whose frequency can be tuned over some range / From Wikipedia, the free encyclopedia
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"VFO" redirects here. For other uses, see VFO (disambiguation).
A variable frequency oscillator (VFO) in electronics is an oscillator whose frequency can be tuned (i.e., varied) over some range.[1] It is a necessary component in any tunable radio transmitter and in receivers that works by the superheterodyne principle. The oscillator controls the frequency to which the apparatus is tuned.