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Overtone oscillator

Overtone oscillator
Quartz crystals are ground by the manufacturers to oscillate either on the fundamental frequency or on one of the odd harmonics (overtones). Nowadays, this grinding is so accurate that fundamental mode crystals do not oscillate on the third or fifth overtone (as they usually could do in years past). However,the present circuit enables fundamental mode crystals to oscillate on an overtone (third or fifth).
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