Homebrew PCBs

>From: "Max Davies" <max.davies@...>
>Reply-To: Homebrew_PCBs@yahoogroups.com
>To: Homebrew_PCBs@yahoogroups.com
>Subject: [Homebrew_PCBs] Oh no, blank fibreglass again!
>Date: Sat, 26 Apr 2003 17:46:40 -0000
>
>Hi everyone.
>
>A newbie to this group, I am (perhaps over-ambitiously) attempting
>to set up a micro through-hole plating line at home.  It's a lot
>more involved than I ever thought it would be, but I now have most
>of it working fine.  ...Except what should be the easy bit - the
>final stage - the etching!
>I reckon there must be something awry with my tin plating.
>
>It's a total impasse, and nothing I do, from increasing/decreasing
>current to re-formulating the tin plating bath according to
>manufacturer's instructions seems to change things.
>
>Does anyone else use a similar process, or have any clue about what
>might be the problem here?

Professional PCB suppliers use a different etching chemistry - I think it's 
based on ammonia, it's alkaline, anyway. Perhaps that doesn't affect the 
tin.

A good book on all this stuff is by Bishop. It's rather expensive but some 
public libraries in the UK have a copy.

Leon
--
Leon Heller, G1HSM Tel: +44 1424 423947
Email:leon_heller@...
My web page: http://www.geocities.com/leon_heller




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