Book "Functional devices and power supply of telecommunications systems . Lab. Work 9, 10: practice. for students of specialties” by Vladimir Viktorovich Klimovich is not just a textbook, but a real find for students and specialists seeking to deepen their knowledge in the field of telecommunication technologies The publication is a practical guide that will help readers to master the key aspects of the operation of functional devices and power systems necessary for successful work in the field of telecommunications. The book deals in detail with laboratory work, which is an integral part of the educational process for students of technical specialties .. Each laboratory work contains clear instructions and descriptions, which allows readers not only to theoretically understand the material, but also to apply the knowledge gained in practice. This makes the book an ideal guide for students who value a hands-on approach to learning and want not just to study theory, but also to see it embodied in real-world systems. Who is this publication suitable for? First of all, it will be useful for students of technical universities studying in specialties related to telecommunications, electronics and radio engineering . However, the book may also be of interest to young professionals who are just beginning their journey in this dynamically developing field. It will also be useful for teachers who are looking for high-quality materials for laboratory classes and practical courses. The topics raised in the book cover a wide range of issues related to functional devices and their power supply. Readers will be able to learn about the principles of operation of various telecommunication systems, features of their design and operation. Klimovich emphasizes the importance of the right choice of power sources and their impact on the stability and reliability of the systems. These aspects are extremely relevant in the modern world, where requirements for the quality of communication and reliability of telecommunication systems are constantly growing. The author's style is characterized by accessibility and clarity of presentation, which makes complex technical concepts understandable even for beginners. Klimovich is an experienced teacher and practitioner who knows how to convey information to students. His other works are also devoted to telecommunications and electronics, and they are popular with students and professionals. This approach allows readers not only to gain knowledge, but also to be inspired to further study the topic. The book “Functional devices and power supply of telecommunications systems” is not just a textbook, but a full-fledged tool for the formation of professional skills. It will become a reliable assistant in mastering complex topics and will help to prepare for real challenges faced by specialists in the field of telecommunications. If you are looking for a high-quality and up-to-date guide to studying functional devices and power systems, this publication should definitely take place on your shelf. Thus, this book is not only a useful resource for students and teachers, but also an important contribution to the development of education in the field of telecommunications. It responds to the demands of modern learning by combining theory and practice, making it indispensable for all who seek success in this interesting and sought-after field.