Purchase Solution

The DC input power, heat generation and maximum thermal resistance of class A and B amplifiers are calculated, and the resulting numbers indicate that a Class A amplifier is an enormous power waster in comparison to a class B amplifier.

Not what you're looking for?

Ask Custom Question

The DC input power, heat generation and maximum thermal resistance of class A and B amplifiers are calculated. We know that the AC output power is 200 Watts, and that the Class A and Class B amplifiers operate with the maximum theoretical efficiency. We also know that the BJT power transistor has a maximum junction temperature of 155 degrees C, if the ambient temperature is 25 degrees C. The calculated results indicate that the Class A amplifier is an enormous power waster in comparison to a class B amplifier.

Purchase this Solution

Solution Summary

This solution calculates the DC input power, heat generation and maximum thermal resistance of class A and B amplifiers. The resulting numbers indicate that a Class A amplifier is an enormous power waster in comparison to a class B amplifier.

Solution Preview

First, it can be shown that the maximum theoretical efficiency of a class A and B amplifier is 25% and 78.5%, respectively. As the efficiency equals the AC output power from the amplifier divided by DC power supplied to the amplifier, we can now determine the DC power delivered:

Class A: 200 W / 0.25 = 800 W
Class B: 200 ...

Purchase this Solution


Free BrainMass Quizzes
Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

Basic Physics

This quiz will test your knowledge about basic Physics.

The Moon

Test your knowledge of moon phases and movement.