I've been searching in the forum for simulation topics. Some "simple" circuits have evolved to large circuits after asking for simulation problems, other posts tell that every path must end into a GND, and others tell to check all connections. I think I have all of that, but yet it fails. What I am doing wrong? https://easyeda.com/yakumoklesk/Tuto-e8ba5dd45516495d872f5d2ea192aac4 Thanks in advance. David.