Here is a very easy and inexpensive
way of building a crystal oscillator
from a Single lC. Only two of the
inverters contained in the IC are
used. The design is reminiscent of a
traditional rectangular-wave generator
in which a crystal and two resistors
replace the RC network. The oscilator
frequency may be made variable
by replacing the crystal with a trimmer
of 22-68 pF.
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