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Old 6th November 2003, 04:07 PM   #11
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Quote:
Originally posted by audioaction
One thing I would like to know how to do is to apply the silkscreen layer, I can't find any sufficient information on here or the internet.
A Silk screen, is like a window screen (but with very fine mesh) that has a emulsion affixed to it. The emulsion etched by a photo process, much like the photoresist used to etch the copper. This leaves a pattern with all of the text and symbols wanted on the board. Paint is then wiped across the screen, and passes through to the board where there is no emulsion. This leaves the paint where it's wanted. You need one screen for each color of paint to be used. (Check with any local hobby shop that prints T-shirts with silk a screen process, they may be able to show you the procedure)

As far as I know, that's how the silk screen is added to the board. There may be a more modern approach, that I'm not aware of.

-Dan
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Old 6th November 2003, 05:13 PM   #12
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Quote:
Originally posted by nobody special
If anyone needs any custom artwork done, I use Pcad here at work. I'm fairly new at it (I've done a couple boards), but I would like more practice. If anyone needs any design work done, email me. I will do it for free.

Steve
I wanted to email you but you don't allow email to be send to you =)
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Old 6th November 2003, 05:22 PM   #13
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oops! I'll have to look into that. Sorry.
sixtynine462@netscape.net
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Old 6th November 2003, 08:35 PM   #14
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dkemppai
Did you mean silkscreen, which is the (usually white) printing with reference designators, etc. or solder mask, which is what covers the traces, other than the pads?
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Old 6th November 2003, 09:06 PM   #15
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There is a cheaper alternative to using specially designed transfer paper. Check out this post I made a while back:
http://www.diyaudio.com/forums/showt...2110#post22110

The paper is around $11 or $12usd for a package of 100 sheets.
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Old 6th November 2003, 11:20 PM   #16
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Quote:
Originally posted by nobody special
dkemppai
Did you mean silkscreen, which is the (usually white) printing with reference designators, etc. or solder mask, which is what covers the traces, other than the pads?
I meant the silkscreen printing. I assume that is what audioaction
meant. That's what he(she?) asked for.

Soldermask is a different story...
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Old 7th November 2003, 01:29 AM   #17
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ya I was wanting to know if there was some easy diy method for applying the silkscreen layer
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Old 7th November 2003, 06:27 PM   #18
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That would be cool... you don't see many home pcb's with silk screen on them.
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Old 7th November 2003, 06:30 PM   #19
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Quote:
Originally posted by nobody special
That would be cool... you don't see many home pcb's with silk screen on them.

For home silkscreen:

http://photoezsilkscreen.com/
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Old 7th November 2003, 06:42 PM   #20
OliverD is offline OliverD  Germany
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For transferring my artwork to the photoresistant, I use the cheapest method possible: Print it on normal paper using my laser printer, and later making that normal paper transparent by applying cooking oil. Exposure time will be a bit higher and you have to clean your light box afterwards, but it works very good. I once tried this when I ran out of transparent paper at a weekend and never came back to buying exotic stuff.

Another thing I found is that it gives way better results if you apply the photoresistant yourself rather than buying pre-made boards. They don't last very long and if you don't buy from shops with a very short shelf live, you're lost.

I'm one of those who make a PCB for everything, and I've done 100s with this method. Works good for me.
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