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Recent progress in the development of electronic apparatus has made it impossible to handle power sources as accessory equipment. It has become increasingly necessary to regard the power source as an integral part of the total system during the design stage. The basic function of a power source is the supply of electric energy in a manner suitable for the particular interface with the load, and the relevant technology is now under development. Also, there has been considerable progress in meeting the demands for miniaturisation and reduction of power costs. Various types of circuitry for power sources are described, including constant voltage d.c., multi-output d.c., high-voltage d.c. and constant current d.c. power sources as well as rectifiers, contact-voltage a.c. power sources and power sources for testing purposes.