Hartley oscillator requires no coupled inductors

  
Examine a traditional Hartley oscillator circuit, and you`ll note its trademark: a tapped inductor that determines the frequency of oscillation and provides oscillation-sustaining feedback. Although you can easily calculate the total inductance required for a given frequency, finding the coupling coefficient, k, poses technical difficulties and may require experimental optimization, also referred to as the `cut-and-try` method. This Design Idea presents an alternative equivalent circuit that allows you to model the circuit before building the prototype.
Hartley oscillator requires no coupled inductors - schematic




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