There was now a long time ago that I’m passionate about music and electronics. And, two years ago, I decided to merge these two passions to create my own first Hi-Fi system. This article speaks about the second version, which I started a year ago. In a first time, there is the main point that the Hi-Fi must respected : -four audio sources (Bluetooth, radio, jack, phono). -An audio power of 70W -A current consumption of zero when the system was off. -A clean user interface with ergonomic control -A rather nice and worked look -A very reliable and secure system The system includes 4 printed circuits board : -The Linear alimentation -The symmetrical alimentation -The motherboard -The alimentation board You can see on the picture 5, a diagram detailing the way the circuits are interconnected to understand how the Hi-Fi system work. The project will be updated regularly with new details and files.