Sorry
Photos in the davelandnni folder in photos section.
dave
--- In
Homebrew_PCBs@yahoogroups.com, "davelandnni" <daveland@...>
wrote:
>
> Hi
> I have posted in the photos section my first sucessful dual sided
PCB.
> Many thanks to all who have posted their results and ideas. Though
I
> am a lurker, I used a lot of your collective knowledge. Thanks !!
>
> I never thought that toner transfer could get to 16 mil trace/12
> space.
>
> I think I'll give a try at 8 mil trace/space next. But for now
this
> is all I need for the mega88 in a 32tqfp.
>
> I'll post when it is all soldered up and when it is running the
> robot.!!
>
> P.S I love the samsung ML-2250 printer($99 after rebate). My only
> regret is not getting the postscript version ($100 more). I had to
> mess with the EPS file from eagle to get the right page
size/scaling
> ( defaults to A4) and then print using Ghostview. I think that I'm
> not really getting the 1200 dpi resolution from the windows
driver..
> WE will see on my 8 mil tests.
>
>
> Thanks
> Dave
>
> Process used:
>
> Made using Staples #471861 paper.
> Samsung ML2250 printer in 1200 dpi mode.
> Eagle CAD-> exported to eps. Edit PS header From "A4" size
to "letter"
> Then Ghostview for printing.
>
> Align both papers and tape 2 edges to form a pocket. Set cleaned
pcb
> in the pocket and hand iron for ~2mins on highest setting. cool fo
5
> mins and then soak for 10 mins in hot sink water. Peal off paper
as
> much as possible after 5mins and let soak remaining 5 mins.
>
> Use fingers to rub of more paper, Then us scrub pad ( teflon safe)
to
> get a better clean. Use a soft toohtbrush in betwwen pads to do
> final cleanup of clay from tight spaces.
>
> Dry, Inspect and re-clean with toothbrush and water.
>
> Etch 12-15mins in 6"x6" square tupperware container of FErric
Chloride
> (radio shack). container filled 3/8" deep (2-3oz)
> Place closed container in sink filled with 2" hot tap water.
> Constant agitation ( back and forth) for 12 mins.
>
> open container, check for unetched places. If small ( <0.25") use
> paper towel soaked in etchant to rub off the remaining coper in
this
> area. This prevents overetching the res of the board for one
> stubborn area. clean , inspect uner magnification. Use paper
towel
> method again if needed.
>
> Drill on drill press with backer underneath using carbide bits
> (0.020" for vias).
>
> Clean off toner with laquer thinner.
>
> Solder!!!
>