I'm thinking of using the design i found on mainbyte to make a speech in peb plane board.
The drawing has one part that is confusing me. See photo. I have looked at Thierry's website too which has the same concept but do not know if it's another LS00 chip or what.
I was building a speech board, based on some info back in the day, on perf board. I know where the board is, to trace that out, but it would be Monday before I can post a possible answer. Someone else probably already knows or can get an answer faster, but I will post it Monday, if possible, otherwise