@ facten
Thank you, i m going to look at WhatsBestForum.com
Concerning the power supply I have a power conditionner GIGAWATT PC-4 EVO + 1 power cord LS-2 (between the PC and the wall socket), and 3 LS-1 for the electronics. Gigawatt is a Polish manufacturer, maybe not very known in the USA.
maybe i will replace LS-1 by LS-2 but they are also expensive...