This book DIGITAL TECHNOLOGY: PRINCIPLES AND PRACTICE has been designed to provide comprehensive and in-depth coverage of all important aspects of digital principles. It is primarily intended for students who wish to pursue a career in digital technology systems and applications. The book begins with a discussion of various number systems and their application in arithmetic operations. Following logic gates, the application of Boolean algebra and Karnaugh map techniques in solving digital problems and designing digital systems is taken up next. As multivibrators form a very basic device in digital systems, bit sables, astables and monostables (retriggerable and non-retriggerable) so, considerable attention has been paid to their operation characteristics and applications. The chapter on arithmetic logic circuits deals with all aspects of arithmetic operations including their design and operation. An Arithmetic logic unit has also been considered.