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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