Variable-frequency Oscillator

Variable-frequency Oscillator

A variable frequency oscillator (VFO) in electronics is an oscillator whose frequency can be tuned (i.e. varied) over some range. It is a necessary component in any tunable radio receiver or transmitter that works by the superheterodyne principle, and controls the frequency to which the apparatus is tuned.

Read more about Variable-frequency Oscillator:  Purpose, Analog VFO, Digital Crystal VFO, Performance