Posted on Nov 18, 2012

The circuit is an inverter set up as a linear amplifier. Adding the· crystal and capacitors to the feedback path, we turn the amplifier into an oscillator and force it to oscillate at, or least very near, the crystal`s resonant frequency. Trimmer capacitor C2 adjusts the actual operating frequency of the circuit.

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The crystal should be a parallel-resonant type; maximum frequency will depend partly on supply voltage, but it should be possible to go to at least 1 MHz.

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