Quartz Digital
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A digital clock on a small cooking appliance keeps time by?
A. using an internal crystal oscillator at 60 Hz.
B. locking on to the power line frequency.
C.creating its own 60 Hz. squarewave.
D.monitoring the frequency of a quartz-timed oscillator
Use D. as your answer.
Q-Zar – Digital Quartz (1996)