A shader for circuit boards. Yes, I know, circuit boards don't look like that. But it's good enough for many uses, I think.
It is completely procedural, and a total mess.
There are two node groups, circuit board, which outputs a shader, and wiring, which only gives a mask for the traces on a board. Both take three inputs, Wire density, Scale and Texture Coordinate. Best is to experiment a bit with those values, but the defaults are the values used in the render
There are some Todos I don't think I care enough about, but this is under GAL, so please fix em, if you want:

* Make range inf

1. In order to have the ripples in a consistent way, even after scaling, I limited the range of the scale to 10000. This is a crazy scale, like, I don't think anyone will be able to find a use for that. But it isn't nice, I don't really like it, but I'm not competent enough to fix.

2. The Todo is to make some math magic to make the range infinite.

* Make Texture coordinate magic

1. Right now, I have a texture coordinate socket in my node groups. This enables people to use the texture coordinates they want. I did this, because it annoyed me in many other projects. I think, this could lead to confusion, and I'd like something like a default. I just don't know, how

2. If someone is competent enough, either reupload and fix it (I'd appreciate a comment with the link, cause I'm curios), or tell me how in the comments

I think, that's essentially everything. If I make a new version, I'll link it, or re-upload, or whatever possibility there is on Blend Swap. I'm fairly new here ;)
Yeah, and if you use it and don't mind to share your work, I'd like to see some comments with it used