PCB mod boards are useful for a whole range of applications and scenarios from production to upgrades, repair, and hacks.
Dave shows you several examples and talks about creating manufacturing panels for them, along with castellations, V-Scoring, routing, and manufacturability.
PCB Panel Part1:
https://www.youtube.com/watch?v=VXE_dh38HjU
PCB panel Part2:
https://www.youtube.com/watch?v=Uemr8xaxcw0
Automated Panel Testing:
https://www.youtube.com/watch?v=2zGisPMNstI
Forum: http://www.eevblog.com/forum/blog/eevblog-1158-how-to-create-pcb-mod-boards/
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