Discussion
Why is a Schmitt trigger used in a relaxation oscillator?
Answer: A
The two thresholds of a Schmitt trigger are exactly the upper and lower limits between which the capacitor charges and discharges, so the circuit needs nothing more than the trigger, a resistor and a capacitor. Its gain is not the point, the capacitor is essential, and amplitude follows the supply. A component whose defining property is a pair of thresholds is a natural fit for a circuit that needs exactly two, which is why the arrangement is so economical.
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