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Old 03-07-2008, 08:25 PM #1
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Default DDL PCB Trace Mask for etchers.

Well, Here's my contribution to the cause. I don't know if anyone has done this yet, but I searched around, and did not see any trace masks made up. The only pcb related stuff I could find was the group buy.

So I went ahead and created a black and white trace mask for the ddl circuit, for people who would like to try their own etching. I've rearranged the layout a tad from the group buy layout, to make it more amenable to home etching. However this brought the size down a tad width wise as well. I did not do a component mask, but I can if there are enough interested to justify it. The placement of the components is pretty self-explanatory.

Things I changed:
*Location of battery negative
*Location of the Pot
*Added vertical mounting option for the diode
*Added mounting holes at the corners

It's currently a size that is likely a bit large for the ideal board, I've done this to make it easy to solder for the novice who would like to try his hand at home etching. It should probably be bigger than the size they are going for in the group buy. The reason being, is that there will be no solder mask to prevent you from over soldering, and shorting things together. However, a poor man's way to solder mask is to get some tiny screws place them through the holes, and shellac the board, or, use clear finger nail polish.

If you are confident in your abilities, you can resize it and mod it to whatever dimensions you would like. I've also left a space on the left hand side for you to add a little text to your board if you like. Note: I'm told you will probably burn through a few of these etching boards, testing etc before you get it right if it's your first time doing this.

A few suggestions I've had was to resize it, and print it out, and place your components pins over the holes to see if they mount how you would like them to.

If you resize it, you might want to consider editing the picture a bit to change the LM317 pin holes to the correct width, the optimum range of which is just under 1/10 of an inch to just over.

The current version and size is based on the pin spacing for the lm317 (top right three holes).

So here you go.... Just etch and drill

OH... Here's an etching tutorial for you folks. There are tons out there in addition to the instructions in the radioshack kit.
However, this one emphasizes safety really well. Make no mistake, this is NOT something you want to do carelessly, unless you don't care how many fingers you have. http://revision3.com/systm/etching/

Rich.

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DDL PCB Trace Mask for etchers.-ddltrace_001.jpg  


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Old 03-08-2008, 07:33 AM #2
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Default Re: DDL PCB Trace Mask for etchers.

also to add to this post...a cheap etching solution can be made from 2 parts hydrogen peroxide to 1 part muriatic acid... you can make approx. 3 gallons for 13$(4$ for 1 gallon of acid and .50$ for each container of peroxide) :
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Old 03-08-2008, 06:52 PM #3
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Default Re: DDL PCB Trace Mask for etchers.

Wow, that is cheap. Does it need to be agitated as much as the rat shack kits? If you don't have an agitator of some kind that can be a drawback. Lightly agitating a bin of acid for 20 minutes is a bit dangerous. How long does it take by the way, in your experience. I know muriatic is not quite as strong as some of the other solutions used for etching, and is much much safer than some. Having done some projects which include a bit of masonry at home, I'm fairly comfy with it.
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Old 03-08-2008, 08:15 PM #4
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Default Re: DDL PCB Trace Mask for etchers.

if you just leave it sitting(no agitation) it just takes longer. i use a plastic bowl/lid and slightly shake it every few minutes. you should always pour the peroxide into your etching container first then the acid. that way it doesnt splash on you. usually takes 15-20 minutes to etch a board.
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Old 03-10-2008, 08:14 PM #5
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Default Re: DDL PCB Trace Mask for etchers.

OK, Someone asked me to create a component mask, and leave it large, because text was difficult. I also made larger contacts for the mounting holes. So this one has to be resized, about 65% seems to be optimum. Photoshop works best. So here's the updated one, Trace and component.

the component mask is ironed onto the top of the board to show where the components go. This is done before drilling, but after the etching bath.
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Old 03-10-2008, 08:15 PM #6
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Default Re: DDL PCB Trace Mask for etchers.

And the resized trace mask (no ability to double attach in yabb?)
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Old 03-10-2008, 08:21 PM #7
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Default Re: DDL PCB Trace Mask for etchers.

i use the method ndrew uses it take about 35-40 minutes with no agitation
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Old 03-10-2008, 08:22 PM #8
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Default Re: DDL PCB Trace Mask for etchers.

Quote:
Originally Posted by gn0stik
(no ability to double attach in yabb?)
You can get more than one pic on your post by uploading them to other sites like photobucket or imageshack, and then using the [img ]url[/img ] things at the beginning and the end of the url. (remove spaces)
Here's a thread about that:
http://www.laserpointerforums.com/fo...num=1180961343
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