After my studies as electronics engineer, I gradually got professionally deviated in the direction of ICT : computer and network support, systems engineer, Windows and Linux servers etc. But after a long time of silence, a couple of years ago I became gradually infected with the vintage radio and measuring equipment virus. And as I like to understand what is going on in all these analog circuits, I jumped on the simulation systems, downloading LTspice and after watching a couple of videos on youtube, I decided to jump in with Qspice. As I retired early this year, at last I have some time for studying and experimenting