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Re: gEDA-user: PCB suggestion



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Hi!

Am 07.01.2005 um 16:40 schrieb Stephen Meier:

Bob,

Please see
http://www.alchemyresearch.com/bga.jpg
http://www.alchemyresearch.com/bga-soldermask.jpg


The via is in the pad as the pictures will show. Make a pad drill a via right through its center. The board layers are glued, then on the bottom side the via holes were coated in soldermask. My understanding is that the holes themselves were filled with some sort of epoxy ressin (after metalization). This hole filling prevents heat from rushing up the via and sucking the solder ball down the via during assembly.

A german PCB manufacturere calles ILFA does have lots of documentation online about PCB manufacturing. They offer a production method calles pluggen (ind the german-english mixe technical language). This document is written in german, but does have several interesting pictures which may be of interest to non german speaking people, too.:


	http://www.ilfa.de/publikationen/publikationen_pluggen.pdf

73, Mario
- -- Mario Klebsch mario@xxxxxxxxxx
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