gunrunnerjohn posted:WOW, looks good! If you used this for multiple TIU's, could you have a single switch output that gets connected to a common input on a single TMCC switch? What does it look like the costs of this module might be?
What you describe is sort of what I was thinking. I found a few us delay really doesn't do much in terms of impacting the DCS performance. The DCS will just keep repeating the command until the hole shows up.
So you'd have a board like the left side of this board that has the 4 filters for the TIU channels, and one shots and "AND" gates to combine them together to send out a TTL signal (0=clear 1=DCS packet). Each TIU would have just that.
Then you'd have a different board at the legacy base that is like the right side of this board. It would accept the TTL signals from all the TIUs, AND them together again, go through the circuit that translates the TTL from layout ground to Earth ground, then has the analog switch.
The one above was $80 for 3 but I wanted to debug it since it's a prototype so it's hole-thru not SMD and I didn't push on the placement much. I bet we could get it down to $30 with a production layout.
