The circuit shown on Picture 1 is Hartley oscillator in its op-amp version. The frequency of the generated oscillations from this circuit is defined by the formulas shown on Picture 2. The inductance coils L1 and L2 can be magnetically coupled or not, thus affecting the resulting inductance L which directly affect the frequency of oscillations of this circuit.
Picture 1: Hartley Oscillator circuit
Picture 2: Frequency of oscillations for Hartley oscillator circuit
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