stan2004 posted:I figure this is yet another chore to verify that relevant revisions of the TIU board group the four left and four right outputs together as suggested here for all 4 channels. Given the ACT244 pinout, it's hard to imagine why you wouldn't group all the lefts together and all the rights together no matter the revision but who knows!
That's what I thought, and I made that "assumption". However, I suspect I should verify it before going to press. 
stan2004 posted:For extra credit, one might research if other DCS devices (DCS Commander, Remote Commander, Explorer, etc.) also use the same ACT244 scheme and hence be candidates for this protection.
Interesting point about the other devices. I don't have a DCS-RC handy to check, the only part I see in a fuzzy photo I have is U3, and it looks to be a different pitch part than the TIU. I don't have the Remote Commander or DCS Explorer, so no possibility of checking those.
stan2004 posted:I see what you mean about the clearance on the leftmost ACT244.
I suppose the neat thing about your single-sided surface-mount design is you could, for no extra cost, put one style on one side of the board and a different style on the other side of the board!
I don't see an easy way to convince the PCB layout package to do the trick with two circuits. In any case, since I'd need boards of both designs, I don't see having two different boards as a big deal, they're very cheap. I can't really build both circuits on one board, I can only use one anyway. 
Here's a new layout. I had to do double-sided to compress it, but I only need one design now. It's .3" x .52" in size, and it'll perch on any of the 20 pin SOIC packages for the ACT244, no overhang. The pads are labeled with pin numbers, and they're spaced correctly to line up with the corresponding pin on the ACT244. If this works for the needed protection, it would be a compact solution to the issue.
