Crystal Oscillator at Overtone

A Crystal Oscillator can be designed to operate at an overtone of the main crystal frequency, allowing high frequency generation with standard crystals.

In this video, Gregory shows a crystal oscillator circuit that can be tuned to oscillate at the 3rd, 5th and 7th harmonic overtones.

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You can read the article about this crystal oscillator, here:
https://gusbertianalog.com/overtone-crystal-oscillator/