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''Practical Electronics for Inventors'' by Paul Scherz

What Makes This Book Unique

Balancing the Theory with the Practical (Chapter Format)

Anumber of electronics books seem to throw a lot of technical formulas and theory at the reader from the start before ever giving the reader an idea of what a particular electrical device does, what the device actually looks like, how it compares with other devices similar to it, and how it is used in applications. If practical information is present, it is often toward the end of the chapter, and by this time, the reader may have

totally lost interest in the subject or may have missed the “big picture,” confused by details and formulas. Practical Electronics for Inventors does not have this effect on the reader. Each chapter is broken up into sections with the essential practical information listed first. A typical chapterone on junction field-effect transistors (JFETs)is outlined below.

• Basic Introduction and Typical Applications (three-lead device; voltage applied to one lead controls current flow through the other two leads. Control lead draws practically no current. Used in switching and amplifier applications.)

• Favors (n-channel and p-channel; n-channel JFET’s resistance between its conducting lead increases with a negative voltage applied to control lead; p-channel uses a positive voltage instead.)

• How the JFETs Work (describes the semiconductor physics with simple drawings and captions)

• JFET Water Analogies (uses pipe/plunger/according contraption that responds to water pressure)

• Technical Stuff (graphs and formulas showing how the three leads of a JFET respond to applied voltages and currents. Important terms are defined.)

• Example Problems (a few example problems that show how to use the theory)

• Basic Circuits (current driver and amplifier circuits used to demonstrate how the two flavors of JFETs are used.)

• Practical Consideration (types of JFETs: small-signal, high-frequency, dual JFETs; voltage, current, and other important ratings and specifications, along with a sample specification table)

• Applications (complete circuits: relay driver, audio mixer, and electric fieldstrength meter)

By receiving the practical information at the beginning of a chapter, readers can quickly discover whether the device they are reading about is what the doctor ordered. If not, no great amount of time will have been spent and no brain cells will have been burned in the process.

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