The Handbook of Electronics Formulas, Symbols and Defini­ tions has been compiled for engineers, technicians, armed forces personnel, commercial operators, students, hobbyists, and all others who have some knowledge of electronic terms, symbols, and theory. The author's intention has been to provide: A small, light reference book that may be easily carried in an attache case or kept in a desk drawer for easy access. A source for the majority of all electronic formulas, sym­ bols, and definitions needed or desired for today's passive and active analog circuit technology. A format in which a desired formula may be located almost instantly without the use of an index, in the desired trans­ position, and in sufficiently parenthesized linear form for direct use with any scientific calculator. Sufficient information, alternate methods, approximations, schematic diagrams, and/or footnotes in such a manner so that technicians and hobbyists may understand and use the majority of the formulas, and that is acceptable and equally useful to engineers and others very knowledgeable in the field. iii ACKNOWLEDGMENTS Much of the material is this Handbook is based upon a small loose-leaf notebook containing formulas and other reference material compiled over many years. With the passage of time, the sources of this material have become unknown. It is impossible therefore to list and give the proper credit.