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That stage has \( R_{C} = 3.3 \ \mathrm{k\Omega} \) and \( V_{CC} = 12 \ \mathrm{V} \). Its collector-emitter voltage is about

  • A.3.4 V
  • B.5.6 V
  • C.8.6 V
  • D.1.5 V

Answer: A

Both resistors carry essentially the same current:

\[ \begin{aligned} V_{CE} &= 12 - 1.9\mathrm{m}(3300+1200) \\ &= 12 - 8.6 = 3.4 \ \mathrm{V} \end{aligned} \]

so about 3.4 volts - workable but low for a large swing, and a smaller collector resistor would centre the point better. Computing the quiescent voltage and then asking whether it leaves room to swing is the second half of any bias calculation.

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