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เนื้อหาย่อ : PREFACE The feld of electronics has expanded at a phenomenal pace, and pre- etions are that it will continue to grow at a rapid rate for some time to Applications of electronic principles cover an expansive field luding (1) communications, (2) scientific research, (3) therapeutics, business, (5) industry, (6) automation, (7) safety control, (8) com- ters, (9) guided missiles, (10) telemetry, (11) aeronautics, (12) astro- utics, (13) cybernetics. Although many of the circuits used in the applications of electronics quite diversified and complex they generally have two points in mmon: (1) They employ one or more of the basic circuit elements as resistors, inductors, capacitors, vacuum tubes, gas tubes, and nsistors. (2) They employ one or more of the basic circuit applica- of these basic circuit elements. In order to understand the many plex circuits used in electronics, it is necessary to have a thorough owledge of the basic circuit elements and their basic circuit applica- With this background it is then only necessary to study the new mbination of circuit elements and their circuit applications in order to derstand the operation of the complex circuits that are used in modern plications of electronics. The purpose of this text is to present, at an intermediate level, a mprehensive study of the principles of operation of vacuum tubes and nsistors, their basic circuits, and the application of these circuits to audio-frequency sound systems, and (2) radio receiver applications. chapter on test equipment and test procedures as applied to receiver reuits is included to provide an introductory knowledge to these bjects. This book is intended for: (1) students studying radio and/or basic dectronics in a technical institute, junior college, trade and vocational hools, and industrial training programs; (2) persons not attending any gular school but who wish to study the subject at home on an inter- ediate level. This book is also intended to provide the background cessary for further study of electronies in fields such as the high- equency and ultrahigh-frequency circuit applications which presuppose knowledge of the basie detector, amplifier, .oscillator, and rectifier rcuits for low-frequency applications as presented in this text. The following features, not generally found in any one book, have been imcorporated in this text.