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This simple circuit board helps you while you design your own board. It shows how small a 30 mil font really is, and why you might want to avoid 0402 resistors. It demonstrates common situations like a silkscreen over traces and vias and different copper / silkscreen combinations.
You can read a bit more about the different parts of the board here.
The board is similar to my first version, the most significant changes are the order of the drills on the top edge, and the drill diameters for the four corners. This updated version has 4 different diameters, ranging from 2.7mm to 3.6mm.
Please note that different PCB fabrication services have different minimum widths for the silkscreen. If the silkscreen is to thin, it might not be legible.
Besides the common green soldermask, the board is also available in other commonly used soldermask colors.
This is the default options. The silkscreen texts are described by their line height and the ratio of line width / line height.
In this version the silkscreen texts are described by their line height and the line thickness. Depending on your layout program, this might be more useful than the ratio version.
The boards with a black soldermask have a white silkscreen. At 0.6mm they are the thinnest option available. The black soldermask is very opaque and the copper is hardly noticable under the mask.
The white board has a black silkscreen and is only 0.8mm thick. Like the black version, the white soldermask is quite opaque and the difference between copper filled and empty areas on the board is barely noticeable.
The red board with white silkscreen is 1.0mm thick. The copper filled areas are easy to recognize but not quite as distinct as in the yellow version.
The blue board with the standard white silkscreen is 1.2mm thick.
The blue soldermask is quite opaque but not as much as the white one. If you pay attention you can make out the difference between copper filled and empty areas.
The yellow board has a white silkscreen and is 1.6mm thick. This is currently the thickest version of the board.
The yellow color makes the board stand out a bit more, if your desk is littered with other circuit boards. This version also has the strongest contrast between copper filled and empty areas.
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