Homebrew PCBs

I do not have spirals but you can find resolution targets and test artwork for different linewidths.

The most difficult ones are at a slight angle.

See:

http://www.vinland.com/USAF-1951.html

Bertho

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Wednesday, January 17, 2018 19:10
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Spirals with 20 through 40 mil traces

 

  

I have the very fine .png files showing a spiral black & white traces ranging from 1, 2,3,... up to 15 mil widths.       

Does anybody have image files with similar spirals in 20, 30, or 40 mil traces ?