This link has a good description using conductive ink to actiavte the holes and then plate on that. http://www.thinktink.com/stack/volumes/volvi/pcbproto.htm I'm using eyelets. Recently I got some eyelet samples form Mill-Max 0.037 OD and 0.024 ID Any know of and smaller eyelets ?
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Plated Thru-Holes
2002-03-01 by electronic_workshop