Re: gEDA-user: PCB suggestion

[Mario Klebsch <mario@xxxxxxxxxx>]

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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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