Would I use a test patter or just expose the whole board? How do I see
what the correct time is then? Will it be as clear as copper on one part
(not exposed long enough) no copper on the other (exposed long enough)?
Stefan Trethan wrote:
>On Tue, 11 Apr 2006 20:59:34 +0200, Ronald Vanschoren
><yahoogroups@...> wrote:
>
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>>Anyways, I'm just slightly depressed now, so I need some icecream
>>
>>
>>Thanks in advance for suggestions and greetings,
>>
>>
>>
>>Ronald
>>
>>
>>
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>
>I didn't know conrad had a french operation... long time since i bought
>there..
>
>
>Anyway, about your board. I suggest the following:
>Get a stip of photoboard, pull the protective foil off, and a sheet of
>black paper or cardboard or thin sheetmetal or.. (anything that is REALLY
>not letting through light.)
>
>Now put the this cardboard on the light table, and the PCB on top of it.
>You want to expose only a small part of the PCB at first. After a while
>pull the cardboard back some more to expose a larger area. Time this and
>write down the times (you can mark the back of the PCB). You want like 10%
>to 1000% of the recommended time in coarse steps. Then develop that making
>sure you have the right concentration of developer.
>
>This excludes any transparency problems, and shows you the ideal exposure
>time. Work from there with the transparency and you'll get there.
>
>ST
>
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBs
>
>If Files or Photos are running short of space, post them here:
>http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
>Yahoo! Groups Links
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