Hartley oscillator requires no coupled inductors

Posted on Sep 3, 2012

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
Click here to download the full size of the above Circuit.

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