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Old 27th July 2005, 10:42 AM   #1
Loial is offline Loial  Sweden
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Default Etching PCB:s

How do you make/etch your PCB:s?
I would like to know the best method to make a quite fine pitched PCB for SMD IC:s, qould ordinary plastic film/developing/etching do the job?

OR, does anyone know where you can buy cheap prototype PCB:s? ( by cheap i mean maybe up to 20-30$ a piece )
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Old 27th July 2005, 11:06 AM   #2
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I use the toner transfer method, which has been working pretty well for me. SMDs are no problem.
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Old 27th July 2005, 12:01 PM   #3
magoo is offline magoo  United Kingdom
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There's a good thread here http://www4.head-fi.org/forums/showthread.php?t=129317 about etching boards, and a link to a tutorial.
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Old 27th July 2005, 12:04 PM   #4
Mark Kravchenko --- www.kravchenko-audio.com
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Default Check this out.

http://www.fullnet.com/u/tomg/gooteepc.htm

This site is what got me started on the easy route. The paper advice may not be applicable everywhere on earth but the ideas are!

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Old 27th July 2005, 12:35 PM   #5
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I print the file onto mylar film, then expose the boards under a darkroom negative viewer for 7 minutes, develop in dilute sodium hydroxide solution, wash in running water, etch with a combination of hydrogen peroxide and hydrochloric acid -- for the H2O2 I use the inexpensive pharmaceutical brand which is $0.39/qt -- straight, no dilution and for the HCl I use muriatic acid from the hardware store. just a few ml's of HCl "promote" the reaction.

I can get a 10 mil trace thickness pretty consistently. I also find that "pouring" a ground or power plane causes the etching process to go much faster as there isn't a lot of copper to remove.
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Old 2nd August 2005, 12:30 PM   #6
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Default Re: Etching PCB:s

Quote:
Originally posted by Loial
How do you make/etch your PCB:s?
I would like to know the best method to make a quite fine pitched PCB for SMD IC:s, qould ordinary plastic film/developing/etching do the job?

OR, does anyone know where you can buy cheap prototype PCB:s? ( by cheap i mean maybe up to 20-30$ a piece )
I used to use this process, with boards and chemicals supplied by these guys:

http://www.megauk.com/cgi-bin/mega/l...cing_a_pcb.php

For denser boards, www.olimex.com do 160mm x 100mm double-sided with 0.2mm track and gap, solder resist and silkscreen for $33.
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Old 3rd August 2005, 09:13 PM   #7
Mark Kravchenko --- www.kravchenko-audio.com
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Default Jack what is your recipe for your DIY etching solution?

As above. What do you have to mix? I understand the H2O2 and the Muriativ acid. Acid to the H2O2 makes sense but what are the prportions? It would be a heck of a lot cheaper than Ferric Chloride that I have been buying for way to long.

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Old 4th August 2005, 02:46 AM   #8
Leolabs is offline Leolabs  Malaysia
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try search on Google.I have found lots of articles regarding PCB etching.
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Old 4th August 2005, 03:26 AM   #9
rnrss is offline rnrss  United States
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Default Re: Etching PCB:s

Quote:
Originally posted by Loial
How do you make/etch your PCB:s?
I would like to know the best method to make a quite fine pitched PCB for SMD IC:s, qould ordinary plastic film/developing/etching do the job?

OR, does anyone know where you can buy cheap prototype PCB:s? ( by cheap i mean maybe up to 20-30$ a piece )
you will have a difficult time if you want to get traces less than .010 if you do not have a clean room etc

I just use amonium persufate water and hydrogen peroxide
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Old 5th August 2005, 04:37 AM   #10
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Cleanroom?
I can do 10mil using P'n'P Blue toner transfer, ammonium persulphate, and a bucket. Whats this 'cleanroom' B.S. ?
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