Discussion
What is the chief drawback of a relaxation oscillator as a frequency source?
Answer: B
The period is a resistor times a capacitor, so the frequency inherits both components' tolerance and drift, and stabilities better than a per cent are hard to reach. The square output is often what is wanted, the component count is low, and these circuits work to megahertz. A frequency set by absolute component values can never compete with one set by a mechanical resonance, which is why every accurate clock in a system comes from a crystal and every cheap one from an RC.
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