Homebrew PCBs

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!!!

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!!!
>