Discussion
Which oscillator would you choose for a low-cost flashing indicator?
Answer: B
A 555 astable costs pennies, needs two resistors and a capacitor, and its per cent accuracy is irrelevant to a flashing light. The other three are precision circuits whose cost and complexity would be entirely wasted. Choosing the cheapest arrangement that meets the actual requirement, rather than the best available, is as much a design skill as reaching for precision when it is genuinely needed.
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