Amplifier Theory

From a microvolt in the air to music in the room. Amplification is the quiet miracle at the heart of electronics: a whisper of a signal goes in, and a faithful, larger copy comes out. This book explains that miracle from first principles twice, once through the glowing vacuum tube and once through the cold silicon of the transistor, and then shows them to be two dialects of a single language: a controlled valve with a load line drawn across its curves.

Beginning with nothing more than the idea of gain, it builds the decibel, the load line, and the resonant tuned circuit; opens the triode, pentode, and beam-power tube; crosses to the PN junction, the bipolar transistor, and the field-effect devices that run every chip today; and assembles it all into the most elegant machine in everyday electronics, the superheterodyne receiver, traced signal by signal from the antenna to the loudspeaker.

Inside are 20 chapters across four parts, plainspoken but never watered down; 87 rendered figures of device cutaways, load-line constructions, and signal-path diagrams; and worked examples throughout, plus appendices of formulas, schematic symbols, a decibel table, receiver-alignment procedures, and typical device parameters. Whether you hold a soldering iron or just a curiosity about how the signal actually gets bigger, you will close this book able to look inside any amplifier or receiver and understand exactly what you see.