The second volume of the encyclopedia provides basic information about thyristors (triode thyristors, dinistors and simistors), integrated circuits (analog and digital), light sources, indicators, displays and sound sources. Each article is a complete description of an electronic component or a group of related components. The purpose, principle of operation, basic parameters, manufacturing options and applications of electronic components are described in detail, as well as examples of typical schemes for their inclusion are given. The material is accompanied by photographs, diagrams and diagrams. For amateur radio operators.