Discussion
Which element limits a relaxation oscillator's accuracy?
Answer: B
The period is a resistor times a capacitor, so both tolerances appear directly in the frequency and a per cent is hard to better. Supply dependence largely cancels in a well-designed circuit, current gain does not enter the timing, and the load should be buffered. A frequency set by absolute component values can never rival one set by a mechanical resonance, which is the whole reason crystals exist.
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