In the chapters that follow, you'll find illustrated plans for a wide assortment of semiconductor circuits and projects that will pay for themselves many times over through useful service. If you're like most of my colleagues in the field, you'll discover just the kind of clear instructions and practical circuits you're after. Each circuit serves a worthwhile purpose around the home or workplace ... can be constructed of easily available parts ... and is relatively simple in design. As an added bonus, many can be completed in just a few hours of enjoyable, productive effort.

In order to provide the maximum amount of information that you need with each circuit diagram, power supplies are grouped together in the last chapter and referred to by number. For easy reference during assembly, semiconductor pin assignments have been included directiy'on each diagram and parts are detailed in a list which immediately follows. As a means of further clarifying,technical points mentioned on the diagrams and in the text, schematic symbols and other related matters are explained in a special section.