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???
07/20/11 14:22
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#182931 - Narrow Gap
Responding to: ???'s previous message
Satish Munot said:
Hi
I think the strength of inner conductor is week (sp. weak)
& aera (sp. area) is also Small for inner conductor.
Regards
Satish


Your image as:



is showing a gap clearance size that is about about 20% of your line width. For good quality vendors that can etch to 7 mils clearances reliably this means that the corresponding line widths would be 40 mils on your circuit board!!

I suspect that if you are actually trying to use more realistic line widths of 15 to 18 mils that your low cost PCB vendor (the one that hand drills the holes) will have great trouble etching your pad design in reliable manner when you come there with a gap dimension in the range of 3 to 3.6 mils. Expect to find many of the "jumper pads" connected due to inadequate etching during manufacturing.

Michael Karas

PS. In any pattern you use you have to make the features large enough so that you meet the minimum line width for the board fab shop. In my proposed pad design as:



you can choose to scale up the size of the feature till the center round pad meets your definition of minimum size required to stay adhered properly to the base laminate material.

Michael Karas





List of 43 messages in thread
TopicAuthorDate
PAD as Jumper            01/01/70 00:00      
   Make It Like...            01/01/70 00:00      
      Snake eating snake ;)            01/01/70 00:00      
   Constructing a component..            01/01/70 00:00      
      clue needed            01/01/70 00:00      
         Altium designer forum            01/01/70 00:00      
         Component            01/01/70 00:00      
            The "Component" has 2 pads.            01/01/70 00:00      
               It is quite common ...            01/01/70 00:00      
                  Common practice, ...            01/01/70 00:00      
                     perspective?            01/01/70 00:00      
                        My perspective            01/01/70 00:00      
                           fine table, i just have to add            01/01/70 00:00      
                              technically proficient installers            01/01/70 00:00      
                                 That is not how I think            01/01/70 00:00      
                                    A soldier jump            01/01/70 00:00      
                                 Not for field configuration            01/01/70 00:00      
                                    But Dev Boards            01/01/70 00:00      
                                       RE: But Dev Boards            01/01/70 00:00      
   Another possibility to consider....            01/01/70 00:00      
   Some other ideas from the web            01/01/70 00:00      
      that final picture            01/01/70 00:00      
         original page reference            01/01/70 00:00      
            Another Example Linking Picture            01/01/70 00:00      
               I get the red box again!            01/01/70 00:00      
                  Red Box Indeed...            01/01/70 00:00      
                  Trivial setting, but sometimes quite needed            01/01/70 00:00      
      Going the other way            01/01/70 00:00      
         Removing a Link            01/01/70 00:00      
            You misunderstand            01/01/70 00:00      
               I did misunderstand....            01/01/70 00:00      
      The Whole Point...            01/01/70 00:00      
   PAD as Jumper            01/01/70 00:00      
      Narrow, pointy bits            01/01/70 00:00      
      Isn't that a touch sensor?            01/01/70 00:00      
         PAD as jumper            01/01/70 00:00      
            same comment            01/01/70 00:00      
            Use This            01/01/70 00:00      
               PAD as Jumper            01/01/70 00:00      
                  Narrow Gap            01/01/70 00:00      
   PAD as Jumper/Short link            01/01/70 00:00      
      What "problem" ?            01/01/70 00:00      
      CAD software has lots of primitives            01/01/70 00:00      

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