An expanded circuit diagram of the 741 input stage is shown in Figure 13.6. Assume IC10 = 50µA if A. If the current gain of the npn transistors is βn = 90 and the current gain of the pnp transistors is βp = 40, determine IC9,IC2, Ic4,IB9 and IB4- Do not neglect npn transistor base currents.
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