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Definition of "Hartley Oscillator" |
An oscillator that uses two series connected inductors in parallel [a tapped coil or split coil] with a capacitor. The feedback point for the Hartley oscillator is between the two inductors as shown in the diagram. The oscillating frequency is determined by the LC circuit. / (1) a particular case of LC oscillators when X1 + X2 + 2Xm is realized as a single tapped coil, and X3 is a capacitor. Well suited for variable-frequency operation by varying a single capacitor. Hartley oscillators are usually not used at VHFs of higher frequencies. Similarly, the circuit is avoided at very low audio frequencies. It is important to distinguish the Hartley oscillator from the Armstrong topology. In the Armstrong oscillator, no ohmic connection exists between the two inductors. Instead, coupling is entirely magnetic. |
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