Homebrew PCBs

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!!!
>