Guide to LC Circuits--Article Index


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Technologically and historically, the familiar combination of inductance and capacitance, the LC circuit, is the basic selective unit of electronics. Originally delegated to the tuning of radio apparatus, the LC circuit has found application far afield in many areas of electronics.

This guide describes a number of practical LC circuits and offers enough background theory to promote the understanding of them. A sufficient amount of space has been devoted also to resistance, since that property is inherent in practical inductors and capacitors.

Although the material is addressed to the electronics student, technician, and experimenter, more advanced readers may find certain parts of it useful, if only for reference purposes. A minimum of mathematics is employed-physical explanations being preferred where feasible-and frequent illustrative examples demonstrate the necessary calculations.

We hope that this guide will serve both the novice and the virtuoso.

The LC circuit, consisting of inductive and capacitive elements, first found widespread popularity in tuning circuits of radio equipment. That popularity, however, was not to be restricted only to radio devices and as electronics state-of-the-art advanced into new areas, so did the LC circuit as a basic selective unit of electronics.

This guide provides sufficient applicable background theory to support the practical LC circuits presented. Only the necessary mathematical formulas are employed where needed to keep the subject of inductors and capacitors as uncomplicated as possible. Where mathematics is used, examples are offered to reinforce the principles involved.

The guide begins with fundamental theory in Section 1, covers the numerous tuned circuits that use LC combinations in Section 2, presents various types of filter applications in Section 3, and discusses many special bridges and other measuring devices in Section 4. Seven appendices are provided for easy reference to the useful tables, such as angular velocity, reactance of inductors and capacitors, resonant frequency of LC combinations, RC and RL time constants, and conversion factors.

Although the treatment of the subject and the level of difficulty is aimed at the electronics student, technician, and experimenter, other readers having advanced abilities in electronics may find parts of the guide useful also.

Dr. RP Turner -- author of this guide -- is the author of 47 books and over 2500 articles. He earned his BA degree (with honors) at California State University at Los Angeles, and his MA and PhD. degrees at the University of Southern California. He is a licensed professional engineer in California and has both engineering and college-teaching experience.

Included among other Sams books by Dr. Turner are Technical Writer's and Editor's Stylebook, abc's of Integrated Circuits, Metrics for Millions, Solid State Components, Getting Acquainted With the IC, abc's of Calculus, Solar Cells and Photocells, Frequency and Its Measurement, abc's of Integrated Circuits, abc's of FET's, Simple IC Test Instruments You Can Build, and FET Circuits.

Also see:

Guide to Crystal Oscillators

Guide to Reading Schematic Diagrams

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