BEST PCB DESIGN SEQUENCE

Thread Starter

connect.electrospark.krr

Joined Jan 25, 2016
10
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
 

hrs

Joined Jun 13, 2014
244
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/threads/project-photographic-methods-of-making-pcbs.107696/#post-825055
 

jpanhalt

Joined Jan 18, 2008
10,087
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/threads/is-possible-to-make-pcb-photo-resistance-using-emulsion-paint.120132/#post-958813 See inserted comments below.

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
So far, so good.
– apply enamel paint on copper clad board for photo resistant (Reference) -
That is a non sequitur for the photoresist method. That is, it defeats the purpose of using photoresist.
Screen Printing using UV Exposure
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.
- Developing using SODIUM METASILICATE PENTAHYDRATE
OK, some but BUT NOT ALL photoresists can be developed with sodium metasilicate. Be sure the one you use can be developed that way.
– Etching using FERROUS CHLORIDE(FeCl2) –
Ferrous chloride will not work for etching. You need ferric chloride (FeCl3).

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
Good luck.

John
 

Thread Starter

connect.electrospark.krr

Joined Jan 25, 2016
10
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/threads/is-possible-to-make-pcb-photo-resistance-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

Thank you John

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

Thread Starter

connect.electrospark.krr

Joined Jan 25, 2016
10
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/threads/project-photographic-methods-of-making-pcbs.107696/#post-825055
Hello HRS

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

Wendy

Joined Mar 24, 2008
22,155
This from the Completed Projects forum:


Printed Circuit Boards (DIY)
 
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