The book shows the design of a wide range of power supplies in stages. With its help, everyone who has basic knowledge in the field of electronics will be able to design and create complex power sources. In addition to general industrial approaches to design, the design of linear, pulse and quasi-resonant power sources is systemically presented. Complex issues like magnetism and electromagnetic interference control are explained in simple and accessible language. The publication is a practical tool, organized in such a way that both experienced and novice developers can quickly find and apply the information they need.