Originally Posted by
737NUT
Actually, i tried it the way it was shown in the other thread, i tried it like you said, and tried it on each switch. Nothing fixed it other than grounding the usb housing. OP support said diodes ar NOT needed on that usb axis card as the program in the pic has taken that unto account. Like i said before, i have no didodes and it is functioning PERFECT now after adding the gnd strap.
On my findings, diodes would be a waste of time to add when they are not needed. Another example in a real aircraft, the CDU keypad, it is matrix set-up and has no diodes!