A low component count RF Oscillator

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RF oscillator circuit diagram
This simple RF oscillator provides good frequency stability because capacitance variations at the semiconductor junctions are swamped out by C1 and C2.  The diode protects the transistor BE junction from large reverse voltages and has a helpful effect on shaping the current flow through that junction.  The frequency of oscillation is set by L1 and C3.  The frequency limit of this circuit is about 10MHz.

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