by Sy Levine
These three volumes present difficult information in a simplified manner,taking the reader from basic electrical theory to modern discrete components.Each chapter stands independently and includes a "self-quiz" (withanswers in the back of the book). Book One (305 pages) explores basic conceptsand passive components laying the foundation for more advanced study.Book Two (357 pages) discusses the discrete semi-conductors and opto-electronicsfound in most present-day and many early elevator controllers. Book Three(317 pages) covers integrated circuits and computer concepts, as well asthe "black boxes" found in today's microprocessor-based elevator controllers.