The schematic diagram and Op Amp IC 741 Pin Diagram is shown in Fig. 33.4 (a) and in Fig. 33.4 (b). It is not necessary to understand every detail about the circuit design and its operation in order to be able to use the IC. What must be understood is the correct terminal connection and biasing for the input terminal, as well as the limitations on supply voltages, signal levels, and external load. In the schematic diagram shown in Fig. 33.4 (a), the base leads of Q1 and Q2 are connected to the pins on the IC unit and serve as the two inputs of the op-amp. Q1 and Q2 transistors form a differential amplifier circuit. Transistors Q12 and Q13 constitute a complementary emitter follower output stage. The output is taken at the emitter of transistors Q12 and Q13. This push-pull configuration allows the op-amp to have a very low output impedance, which is analogous to a voltage source having a very small internal resistance.
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