@gunrunnerjohn Can you add a BOM to the first post? I found another thread with a BOM list... but now that I have it all in front of me it looks like I may be missing something.
Here's the thread I found the BOM originally: https://ogrforum.ogaugerr.com/topic/pbw-needed?reply=100540307597091066#100540307597091066
However it appears this WD gen rev uses a different PCB layout/parts from the post above
Edit: I'm just now realizing that the BOM on that thread is for an older 555 revision of the board. I see a Rev 2 on the bottom of this board so that explains the wildly different PCB layouts