Homebrew PCBs

Some "pitting" is normal with TT, from your pix it looks more like the
etchant got under the toner in some spots .. never seen that happen before -
are the traces actually broken, or just darker?

Also looks like the toner has "spread" somewhat from being squeezed down
hard - but not so hard that yr 10mil traces join, so probably not a problem.

PG

On Tue, Oct 19, 2010 at 12:03 PM, Jean-Marc Spaggiari <
Jean-Marc@...> wrote:

>
>
> Hi all,
>
> I read few emails on the last few months regarding Toner Transfert for
> home-made PCBs.
>
> I tried over the last 3 days to do my own, but now really successful.
>
> I'm using a Lexmark E210 (600dpi) with Stapple Gloss paper.
>
> I looked over 200 videos on Youtube to find the right way to do it,
> and here is what I did.
>
> Print the schema on the gloss side of the gloss paper keeping my
> fingers away from the printed area.
> Cleaned the board with Vim, rinced it, and cleaned again with Acetone.
> Placed the schema on top of the board.
> Heated it without moving for the few first seconds to fix it, them
> pressing hard and everyone to be sure it's well pressed for 6 minutes.
> Putted the board on some water with 1 drop of soap for 5 minutes.
> Pilled the paper, the scrubbed it to reveale the tracks.
>
> At that point, the board seems to be well printed, all the tracks
> beeing nice well separated and clear.
>
> My concern is after the etching. There is some "holes" on my tracks :(
> Like is the acid was going below the toner.
>
> I tried with 10 mils, 15 mils and 20 mils. The holes are big enought
> to cut 10 and 15 mils tracks. But 20 mils are "safe".
>
> I have uploaded a picture on my album. Not 100% sur how to share it.
>
>
> http://groups.yahoo.com/group/Homebrew_PCBs/photos/album/1194946320/pic/2101422375/view
>
> At the end, my goal is do to a double-side board.
>
> I'm not stuck with the Toner Transfert. If I phone something else
> working better, I'm fine with that. But I don't want to pay 10$ for a
> 4"x6" piece of copper. I'm doing my tests with a 24x12 board I bought
> 4$ ;) I tried with some other boards (4x6) with the same results.
>
> So few questions.
>
> What's wrong? ;) I'm suspecting the etching to be to agressive. I'm
> doing it on a plate using Q-Tips to brush the board, all of that at
> 50C
> I would like to try the photo-transfert method, but it there a way to
> "transform" a standard board to a photo-sensitive one whitout spending
> 10$ per board?
> Is there few posts you can point me to so I can see past threads
> related to this subject?
>
> Also, sorry if I don't have all the right vocabulary. I'm still learning.
>
> Thanks, and looking forward to read you.
>
> Jean-Marc
>  
>


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