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(Solved): Consider the BJT circuit below. Figure 3: BJT LED driver (a) What are the base currents and the co ...
Consider the BJT circuit below. Figure 3: BJT LED driver (a) What are the base currents and the collector currents, when S is closed and when is open? (b) What are the possible modes of operation of the transistor in the circuit? Give reasons to your answer. (c) If you are provided with a photodiode, a light beam and necessary components, how would you modify this circuit to detect a person crossing a security barrier? (The lamp should glow when a person crosses the barrier)