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An integral part of all electronic devices is the power supply, which undertakes to supply devices with constant voltage resulting from the conversion of the network voltage. In this thesis there is a comprehensive study on the technology with which modern switch power supplies function. It analyzes the various methods and the individual elements of which a power supply comprises. Reference is made to the issue of safety of the user and the device since we are talking about a device that is connected to high voltage, and also the necessity in the modern world, new devices and technologies to be more energy efficient. What follows is the description and step by step details of this entire construction. This switching power supply uses for controller a programmable PIC microcontroller, and not a integrated one which is marketed for this purpose, in order to highlight the function mode and signal processing. A reference is also made to the particularities and difficulties that arise, to finally reach conclusions and results that show the potential improvement and growth according to the needs.