Discussion
What does a speed-up capacitor across the base resistor achieve?
Answer: A
The capacitor passes a burst of current at each edge, charging and then removing base charge quickly, while the resistor sets the steady drive. It does not reduce the steady current, offers no reverse protection, and cannot raise the available collector current. Giving a circuit a different response to transitions than to steady conditions is a recurring trick, and a capacitor across a resistor is its simplest form.
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