Homebrew PCBs

On Sun, 19 Mar 2006 21:37:27 +0100, Ronald Vanschoren  
<ronald.vanschoren@...> wrote:

> Appearantly it doesn't show up in mail digest either. Didn't know about
>
> that, cause it works on another Yahoo Group I'm in.
>
> But anyways, I posted a picture on the group under the PhotoEtching
>
> directory -> Testboard.png
>
>
> I already found out spacing must be at least 0.2mm or it won't come out
>
> of the printer well.on glossy paper, must check again on transparant  
> slides.
>
>
>
> greetings,
>
>
> Ronald


Ronald,

you might want to calculate the width and spacing steps to occur at full  
steps of printer resolution.
For example a 300DPI printer will have a dot size of 3.33mil. I usually  
use 6.66mil as the minimum i can easily make on a 600dpi printer, with  
toner transfer, so that might be different for you.

Otherwise your test pattern is just fine, linewidth and spacing tests, in  
both directions and 45degree, and a ground plane test, all there.
I also usually add some different size text to see how small i can go.

For toner transfer it can be useful to draw a line of known width, and  
where it ends immediately start a "gap" test where the gap is the same  
with as that line. This shows you nicely if, and how much, the lines widen  
due to toner spreading.

ST