This book is a collection of practical recommendations for the design, manufacture and commissioning of analog and digital electronic circuits for various purposes. Much attention is paid to the features of using a variety of electronic components, issues of development and manufacture of printed circuit boards and cases, methods for testing devices and troubleshooting. A large number of relatively simple digital and analog circuits are presented. A separate chapter is devoted to solving typical problems in programming microprocessors and microcontrollers; examples of useful subroutines are presented. The book is addressed to both beginner electronics and radio engineering enthusiasts and professionals.