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เนื้อหาย่อ : In compiling a book on electronic components, there inevitably arises the question of what the scope of this topic will be. So often does one find information on the theory and manufacture, which can be not only irrelevant to one's needs, but also not very helpful to constructors. What is often required is some practical guidance on the choosing and using aspects. In a book of limited proportions there must be some points that are not included and it will be largely through the con- structor's personal and practical experiences that he will learn most. What can be done, however, is to take an objective look at some of the more frequent problems that arise with newcomers to the art, and perhaps discuss some of the less obvious points. This book does not claim to be anywhere near an exhaustive treat- ment of the subject; to do so would occupy very many more pages, which inevitably leads to higher wastage to the user. What is provided in a readily digested form are some useful hints that one acquires through experience and a small amount of 'textbook' style support information. Photographs and drawings help to identify some of the components. The text is aimed at constructors with a small measure of experience and an understanding of common everyday terms used. The book will appeal particularly to hobbyists and technicians, and will most prob- ably provide a useful support for students and trainees, and especially to readers of the popular constructional type magazines. In compiling the information given, the author has received con- siderable co-operation from a number of firms and organisations who have kindly supplied photographs and information. To all of these the author extends his thanks and, where appropriate, acknowledgement is given against photographs that have been used.