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01/29/07 13:41
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 		 #131627 - An 8051 on a DS board
I have just finished my schematic and my PCB for my 8051 mini-computer, and printed each side of the PCB on its own transparency with a laser printer.

I'm at the point where I'm ready to expose and develop the board.
I am proficient when it comes to single sided boards, but now, because I am doing a double sided board, I am seeking advice before I go ahead.

Some people have mentioned the use of thin clear tape. But that could impair the exposing process.

What I might do is drill alignment holes in the board BEFORE exposure and then align the transparencies to those holes.

I also was thinking about doing one side completely (expose, develop, etch), while leaving the other side covered, but then again that could be a bad idea.

as for exposure, how long can I leave an exposed board in incadescent (standard 40W) room light?

AND, if my plans are stupid, can someone please explain to me the best way to make a double sided board without the use of tape?

Please help
Thanks.

List of 57 messages in thread
TopicAuthorDate
An 8051 on a DS board            01/01/70 00:00      
   down memory lane            01/01/70 00:00      
      thanks.            01/01/70 00:00      
         Etchant undercutting            01/01/70 00:00      
            photoresist?            01/01/70 00:00      
   I would let them fabricate...            01/01/70 00:00      
      3 or 4 revisions later...            01/01/70 00:00      
         Coming down to earth with a bang...            01/01/70 00:00      
            Yes            01/01/70 00:00      
            Not a valid question            01/01/70 00:00      
               My intention is not what you think...            01/01/70 00:00      
                  SS I think is better            01/01/70 00:00      
                     In your case, wire-wrap would be better yet.            01/01/70 00:00      
                        answer            01/01/70 00:00      
                           one thing at a time ...            01/01/70 00:00      
                              yes I have            01/01/70 00:00      
                                 Why?            01/01/70 00:00      
                                    even bettwr            01/01/70 00:00      
                                    Oh, please, please, please ... not ATMEL!            01/01/70 00:00      
                                       Just curious, why?            01/01/70 00:00      
                                          Richard has his reasons, here is mine            01/01/70 00:00      
                                             Come on, are we snivellers or professionals??            01/01/70 00:00      
                                                no 'advice' in my post            01/01/70 00:00      
                                                   Semantic quibblings...            01/01/70 00:00      
                                                      Forewarned is forearmed ... once bitten, twice shy            01/01/70 00:00      
                                                Waitaminute ... those others didn\'t do that            01/01/70 00:00      
                                                   attitude - arrogance we agree            01/01/70 00:00      
                                                      Our FAE didn't protect us ...            01/01/70 00:00      
                                                   Again a single event...            01/01/70 00:00      
                                                      No, Kai, it's a year-long string of events            01/01/70 00:00      
                                                         Then stay away from Atmel's products...            01/01/70 00:00      
                                                            Yes, that seems to work satisfactorily            01/01/70 00:00      
                                             Well, that's a reason.            01/01/70 00:00      
                                                OT - Fortran compiler            01/01/70 00:00      
                                                Atmel works for me            01/01/70 00:00      
                                                   Of course it does            01/01/70 00:00      
                                                Off topic, but - Fortan compiler?            01/01/70 00:00      
                                                   Fortran            01/01/70 00:00      
                                                      Sad but true...            01/01/70 00:00      
                                                   Rob, Caslav Why put that in this thread?            01/01/70 00:00      
                                                      Agreed...            01/01/70 00:00      
                                                         Sorry            01/01/70 00:00      
                                                         A new thread\'s warranted            01/01/70 00:00      
                                                            Anything else?            01/01/70 00:00      
                                                               Yes...            01/01/70 00:00      
                     SS is easier            01/01/70 00:00      
            It doesn't take long to wire-wrap ...            01/01/70 00:00      
   Two sided board alignment            01/01/70 00:00      
   Q for Mike            01/01/70 00:00      
      F15T8BL            01/01/70 00:00      
         a guide for double sided pcb fab            01/01/70 00:00      
      OSRAM            01/01/70 00:00      
      back in the \"old days\"            01/01/70 00:00      
   a footnote            01/01/70 00:00      
      if you have a ground plane ...            01/01/70 00:00      
         HUH?            01/01/70 00:00      
            Yes, it's the made-in-the-kitchen ones ...            01/01/70 00:00      

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