Basic Printed Circuit Board Layout
The print itself can be placed inside the actual enclosure; you can see how it will be positioned in relation to other parts. You can also place components up against the pad markings as a quick idiot-check of dimensions. The width of the tracks is a trade-off based on current flow, space available, size of parts, and electromagnetic interference. The track layout is a similar trade-off that also picks when to dodge from one side of the board to the other to avoid an obstacle, but overall normally aims to find the shortest regular path between the connected points.Given the impedance, susceptibility, and signal on tracks, the loop area is another trade-off that is considered as the design proceeds. These days most circuit boards are automatically assembled and tested, but people still install and repair them. Having a quality design can make all the difference between a product that is pleasant to work on and one that you will hate. Machine test points, for ATE (Automated Test Equipment) bed of nails testing, only need to be plain pads or lands. Some test points, however, are really intended to be for engineering test or modification - for these you could put in labeled, circled pads. A complete silkscreen identification overlay will only make a better product. The silkscreen contains important information that assists people to service and install the product. Aside from the printed circuit board functionality, the overlay is the chief distinguishing feature between a purpose-built product, and a general-purpose controller or ready-made PLC. For dense surface mount boards, you would need to leave off component values, and sometimes omit the component designators.
First try to drop the size of the lettering - small text being better than no text.
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06.05.2010
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