Amplification is, arguably, the most important contribution of electronics. So important, in fact, that it has had a profound effect on entertainment, radio and TV, and automatic control systems in both home and industry. The implications are far-reaching indeed. Nonetheless, it is as much concept as it is reality.
To the uninitiated, it may seem like the efficiency of amplifiers is more than 100%, where we get something for nothing. This misinterpretation is understandable, because w
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