The construction of the class A power amplifier circuit in push-pull configuration is shown as in the figure below. Construction of Push-Pull Class A Power Amplifier This push-pull configuration can be made in class A, class B, class C or class AB amplifiers. In this circuit, we use two complementary transistors in the output stage with one transistor being an NPN or N-channel type while the other transistor is a PNP or P-channel (the complement) type connected in order to operate them like PUSH a transistor to ON and PULL another transistor to OFF at the same time. It is possible to obtain greater power output and efficiency than that of the Class A amplifier by using a combinational transistor pair called as Push-Pull configuration. The main problems that should be dealt with are low power output and efficiency. So far, we have seen two types of class A power amplifiers. Emitter Follower & Darlington Amplifier.Transformer Coupled Class A Power Amplifier.
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