For engineers, technicians and hobbyists involved in the design, testing and implementation of regulated power supplies, this fourth edition is revised to include up-to-date guidance for building regulated power supplies. The author provides full coverage of standard power supply sources now found in the majority of applications. He also describes how new high frequency devices such as the insulated-gate bipolar transistor (IGBT), the mos-controlled thyristor (MCT), and current- and resonant-mode regulators have reduced production costs and improved power supply efficiency and reliability.