Discussion
What sets the two intervals of a 555 astable's output?
Answer: D
The capacitor charges through both resistors and discharges through only the second, so the high time depends on their sum and the low time on the second alone, both scaled by the capacitance. Supply and load do not enter the timing, the comparators' thresholds are fixed fractions of the supply and so cancel, and reset and control are auxiliary functions. That the mark and space are set by different resistances is why a plain 555 astable cannot reach a symmetrical square wave without a diode across one resistor.
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