BEST PCB DESIGN SEQUENCE

Discussion in 'General Electronics Chat' started by connect.electrospark.krr, Feb 1, 2016.

  1. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
    10
    0
    Hello Friends,

    I had decided to design PCB board by Using UV exposure method and first I decided to do design process as mentioned below

    Layout Printout in OHP sheet – apply enamel paint on copper clad board for photo resistant (Reference) - Screen Printing using UV Exposure - Developing using SODIUM METASILICATE PENTAHYDRATE – Etching using FERROUS CHLORIDE(FeCl2) – Plating using TIN LIQUID – Solder Masking using Solder Mask Paste, brought from eBay (Reference) – Drilling – Components Placing – Conformal Coating

    After that I referred many tutorials and videos, in that they had done all above process, but not in above sequence. Now please write me, weather above sequence is best sequence, or any other sequence that gives best results.

    Thanks in Advance

    Regards,

    Parthasarathi
     
  2. hrs

    Member

    Jun 13, 2014
    82
    7
    I don't think there is such a thing as photosensitive enamel paint. I think Craps1956 just draws the tracks by hand straight onto the copper. Uncovered parts will be etched.

    If you want to do the UV exposure method it's probably easiest to buy some presensitized boards:
    http://www.ebay.com/sch/i.html?_sacat=0&_nkw=presensitized+pcb&_frs=1
    Be sure you understand that there are photopositive and photonegative boards and what that means.
    Also have a look at this:
    http://forum.allaboutcircuits.com/t...ic-methods-of-making-pcbs.107696/#post-825055
     
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,699
    907
    The above sounds virtually like a duplicate of this thread -- at least in content, if not in the actual words used: http://forum.allaboutcircuits.com/t...ance-using-emulsion-paint.120132/#post-958813 See inserted comments below.

    So far, so good.
    That is a non sequitur for the photoresist method. That is, it defeats the purpose of using photoresist.
    OK, UV can be used in screen printing; however, it is not clear how you intend to employ that process. You will probably not get very good resolution.
    OK, some but BUT NOT ALL photoresists can be developed with sodium metasilicate. Be sure the one you use can be developed that way.
    Ferrous chloride will not work for etching. You need ferric chloride (FeCl3).

    Good luck.

    John
     
  4. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
    10
    0

    Thank you John

    sorry to say, i using ferric chloride (FeCl3); i had mentioned wrongly. is this sequence is OK for design PCB
     
  5. connect.electrospark.krr

    Thread Starter New Member

    Jan 25, 2016
    10
    0
    Hello HRS

    Thanks for your reply. but I'm from India and it is difficult to buy from here
     
  6. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,699
    907
    In answer to the underlined portion, no. That is not a good sequence for design PCB. In fact, it is non-workable as described.

    John
     
  7. Wendy

    Moderator

    Mar 24, 2008
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