Question

The company that manufactures the PA system developed for question 2 wants to replace the audio amplifier with a new design using an op-amp instead of the discrete transistor preamp circuit to reduce parts and cost. The power amplifier will still retain its basic design with only a few changes. The circuit diagram of the PA system is shown in figure 8 a) What is the minimum and maximum voltage gain of the operational amplifier? b) What is the function of $R_{null}$? c) Why Darling pair configuration is used in the output stage of the amplifier? d) Assume the output impedance of the microphone to be 0. Why amplifier design in this question is better than that of question 2

          The company that manufactures the PA system developed for question 2 wants to replace the audio amplifier with a new design using an op-amp instead of the discrete transistor preamp circuit to reduce parts and cost. The power amplifier will still retain its basic design with only a few changes. The circuit diagram of the PA system is shown in figure 8
a) What is the minimum and maximum voltage gain of the operational amplifier?
b) What is the function of $R_{null}$?
c) Why Darling pair configuration is used in the output stage of the amplifier?
d) Assume the output impedance of the microphone to be 0. Why amplifier design in this question is better than that of question 2

The company that manufactures the PA system developed for question 2 wants to replace the audio amplifier with a new design using an op-amp instead of the discrete transistor preamp circuit to reduce parts and cost. The power amplifier will still retain its basic design with only a few changes. The circuit diagram of the PA system is shown in figure 8
a) What is the minimum and maximum voltage gain of the operational amplifier?
b) What is the function of Rnull?
c) Why Darling pair configuration is used in the output stage of the amplifier?
d) Assume the output impedance of the microphone to be 0. Why amplifier design in this question is better than that of question 2

Added by Gordon R.

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