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

 

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

 

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.

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

 

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

Thank you John

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

 

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

Hello HRS

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

 

Thank you John

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

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

 

This from the Completed Projects forum:


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