The book "Calculation of power sources of communication devices" under the authorship of B. E. Kitaeva and his colleagues are indispensable work for all those who are interested in modern technologies in the field of communications, electronics and energy. With the rapid development of information technology and increasing demand for reliable power sources, this publication is becoming more relevant than ever. This book is a deep dive into the world of calculations and design of power sources that play a key role in the functioning of communication devices. The authors examine in detail various aspects, ranging from theoretical foundations to practical recommendations for the selection and design of power sources for various types of devices. An intriguing approach to the material allows the reader not only to understand how power sources work, but also to learn how to choose them optimally depending on the specific application. Who can be interested in this book? First of all, it will be useful for students and graduate students of technical specialties studying electronics and communication . It will also attract the attention of engineers and specialists working in the field of design and operation of telecommunications systems. It will be equally interesting for teachers who are looking for high-quality educational materials for their courses .. Adult readers who are interested in electronics and want to deepen their knowledge in this area will also find a lot of useful things in the book. The topics covered in the book cover a wide range of issues, including the choice of components, the calculation of power source parameters, and their impact on the overall efficiency and reliability of communication devices. The authors emphasize the importance of proper design, which can significantly increase the performance and durability of equipment. In an environment where communication reliability becomes critical, such knowledge becomes particularly relevant. The style in which the book is written is distinguished by clarity and accessibility .. The authors use understandable language, which makes complex technical aspects easier to perceive. In. E. China is known for his work in electronics and communications, and his experience, combined with practical examples, makes this book not only theoretically sound, but also practically useful. Among other well-known works of the author are works on the design of radio frequency devices and communication systems, which confirms his deep understanding of the subject. The book "Calculation of power sources of communication devices" is not just a textbook, but a real find for everyone who seeks to be on the cutting edge of technology. It provides readers with a unique opportunity not only to get acquainted with the basics, but also to delve into the details that can be decisive in their professional activities. If you are looking for a high-quality and up-to-date guide to calculating power sources, this publication will become your reliable assistant. Do not miss the chance to expand your knowledge and skills in an area that continues to develop with each passing day. Read, learn and apply the knowledge you have gained in practice and you will see how it will help you in your career and personal projects.