Homebrew PCBs

Hi Patrick,

Seems like we've got a couple threads going...

--- In Homebrew_PCBs@yahoogroups.com, Patrick Cambre 
<braincambre500@...> wrote:
> I have a HP Photosmart 7450 printer...as it does a
> remarkable job on making b/w prints.

Inkjet printers won't work for the toner transfer process.  TT needs 
the toner to be melted.  Ink won't do that.
 
> My further questions are...It seems as though you are
> saying that you use inkject transparancies with an
> iron to press on the image to the PCB. Am I correct on
> that. Is so, would an office supply or Best Buy or any
> of these type chain stores, carry inkject
> transpancies?

I got lucky with the inkjet transparencies.  I bought HP and they 
worked.  They're about a dollar a sheet at office supply stores, so 
it could get expensive trying a lot of brands (no one sells single 
sheets).  I bought mine in bulk in an auction on eBay.  All I knew 
was that they were HP and I took a chance.  It paid off...  Don't 
see that seller listing anymore, but I bought a couple hundred and 
that should last awhile.

> Looking forward to your great words of wisdom and
> encouragement. Your pictures definately look great!

Thanks.  As I mentioned, the narrowest traces I use are 16mil.  
Usually larger to avoid problems with over etching and pitting.  I 
size my traces so pitting doesn't affect current capacity.  I'll 
push spaces down pretty low at times, but I try to minimize the 
tight pitch areas to make transferring less critical.  If I get a 
bridge, I just use an Xacto type knife to clear it before etching.  
Can use the same technique to clear shorts caused by under etching.

Regards,
Dennis