On Sunday, 5 April 2020 13:15:06 UTC+3, Tim Newport-Peace wrote:
Interesting. Many years ago Volkslogger had a similar issue and it is worth
examining their solution. Only the instrument in question (LX9000) needs
protecting, not the entire Avionics Bus.


Wait, don't all other instrument "see" the capacitor in LX9000 as well? It does not matter where the capacitor is physically, it still supplies current to the whole circuit (which is closed, apart for batteries for a short while)?