Question

A Class B push-pull complementary symmetry amplifier uses:

• A. Two NPN transistors
• B. One PNP and one NPN transistor
• C. Two PNP transistors
• D. Pre-amplifier of NPN, then two-transistor amplifier

Hint:

Class B push-pull → uses complementary transistors (one NPN + one PNP) for full cycle amplification.

Answer 1

The Correct Option is B

A Class B push-pull complementary symmetry amplifier is designed to amplify audio signals using a balanced architecture where one transistor conducts for the positive half of the signal while another transistor conducts for the negative half. This configuration reduces crossover distortion and improves the efficiency of the amplifier circuit. The correct configuration for a Class B push-pull complementary symmetry amplifier involves the use of:
1. One PNP transistor
2. One NPN transistor
This arrangement allows each transistor to handle one half of the waveform, resulting in an efficient and symmetric amplification of both halves of the input signal. The PNP transistor is used for the negative half of the signal, while the NPN transistor is used for the positive half, ensuring a complete amplification cycle.