Set-Top Boxes are growing very fast and they are becoming very popular in all Countries either for satellite or cable decoding. Hence the market is asking for solutions having high cost effectiveness, providing for good performances, low noise, small volumes at low cost. The Quasi-resonant operation and the high flexibility of the L6565 make it a very suitable device, able to satisfy all the requirements with only few external components. The board has been designed with mixed technology components, both PTH and SMT. For this reason some components are doubled, in accordance with their ratings.