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Carroll Prepares Book on Tunnel-diode ' and Semiconductor Circuits J ohn M. Carroll, managing editor of Electronics magazine and author of several well-known McGraw-Hill books, has prepared a new textbook which will be of interest to students, electronics technicians, engineers, and scientists. Tunnel-diode and Semiconductor Circuits, slated for publication this month, consists of 120 feature articles which appeared in Electronics during 1960, 1961, and 1962. Unlike many collections of reprints, this book includes a comprehensive introduction of original material which serves to orient the reader. Mr. Carroll gives brief technical descriptions of all the new devices discussed in the articles. T h e first eight chapters give thorough coverage to tunnel diodes— theory, basic applications, test equipment with which to determine operating characteristics, elementary tunneldiode circuits adaptable to a wide range of applications, specific designs for tunnel-diode amplifiers and oscillators, large-signal tunnel-diode circuits suitable for digital computers and other pulse applications, and the use of tunnel diodes as memory devices. Special features include a complete summary of semiconductor circuits applied to microminiaturization; two chapters on parametric amplifiers and voltage-variable capacitors; and information on four-layer diodes, siliconcontrolled rectifiers, and unijunction transistors. Other articles deal with special two-terminal semiconductor junction devices; semiconductor devices utilizing the Hall effect; fieldeffect semiconductor devices and their circuit applications; use of semiconductor junction devices and thermoelectric circuits, especially those using the Peltier cooling effect; and industrial control circuits used in siliconcontrolled rectifiers. T h e articles are arranged for easy reference according to the broad category of application. Articles which explain theory are followed by articles giving specific applications. T h e illustrations have been redrawn, and most of the schematic diagrams give component-part values so t h a t the reader can find a circuit that suits his needs. T h e book will be'•Helpful as a supplementary text in colleges and technical institutes, as well as valuable for self-study. Mr. Carroll is the author also of these McGraw-Hill books—Transistor Circuits and Applications, Modern Transistor Circuits, Design M a n u a l for Transistor Circuits, and Electron Devices and Circuits. Women in Engineering Technology J_jach of the three young women shown here is a freshman this, year in a two-year engineering technology program at New York City Community College in Brooklyn. In welcoming them, Professor Stanley M. Brodsky, head of the school's Division of Technology, said, "Opportunities for women in engineering technology are excellent now, and will improve. We are proud of these young women and pleased to see that they recognize the existing opportunities and are preparing to meet them properly. Women represent a major untapped national resource in engineering technology. Qualified people, regardless of sex, are vitally needed now as technicians. Employers of women technicians report great satisfaction on the part of both employer and employee." Esther Thompson, below left, is an 18-year-dld construction technology major attending college on a Regents Scholarship. She is shown here examining the safety wheel on a large bandsaw. Barbara Lo Dico, below right, is 18 and majoring in mechanical technology. Here she is working on a problem in engineering drawing. Gail Reese, above, takes sensitivity measurements with an r-f signal generator and oscilloscope and f-m receiver as part of her study of electrical technology. At 18, she is secretary of the college's Student Chapter of the Institute of Radio Engineers. All three programs lead to the degree of Associate in Applied Science. I n the 15-year history of the college, only five girls have graduated from the program in construction technology, one from electrical technology, and three from mechanical technology. 16 TECHNICAL EDUCATION NEWS FEBRUARY 1963
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