The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor (the tank circuit). Although there is no requirement for there to be mutual coupling between the two coil segments, the circuit is usually implemented as such. A Hartley oscillator is essentially any configuration that us

es a pair of series-connected coils and a single capacitor. In the oscillator, the feedback voltage is developed by the inductive voltage divider, L1 & L2. Since the output voltage appears across L1 and the feedback voltage across L2, the feedback fraction is As usual, the loading effect of the base is ignored. For oscillations to start, the voltage gain must be greater than 1/ ². The frequency of oscillation is given by

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