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Printed circuits. Typical errors in production documentation. Part 2
The first part of the article (see "Elektronik" issue 3/15) is dedicated to the characteristics of good production documentation and the popular file formats used in the PCB industry. Typical errors of project/design documentation were also discussed as exhibited on mosaic, resists and text layers. Defects of mechanical treatment documentation were also characterised in detail. This part presents the typical construction abnormalities in automated assembly PCB panels, their negative effects, and guidelines for the design of panels that prevent problems in the manufacture and assembly of packs. The end of this article presents the typical omissions found in the specific...
Printed circuits. Typical errors in production documentation. Part 1
The contents and quality of electronic production documentation for printed circuit boards (PCBs) is decisive to the time and cost of finished PCB production. Vague and imprecise information often leads to great problems in proper interpretation of actual customer requirements and, in extreme cases, may lead to manufacturing of non-conforming PCBs. This article discusses the typical errors found in the production documentations that are best avoided. The presented resulting defects are appended with recommendations and tips that warrant efficient production of PCBs that fully meet customer's demands. This work is divided into two parts, due to the sheer volume of issues it d...
Impact of laminate parameters on the life and performance of printed circuit boards
The life (or durability) and reliability of electronic equipment depends on the quality and types of applied components, including the printed circuit boards (PCBs), which are the cornerstone of a performer electronic circuit. Hence it is extremely important to properly select the parameters of base laminates for long life and reliable performance of finished products. Currently the PCBs are manufactured with laminates on the following substrates: glass-reinforced epoxy (designation FR4), aluminium MCPCB (Metal Core PCB), Teflon, or ceramic. The laminate type selection depends on the application of the finished device and its operating conditions. This article large...
Methods of printed circuit board pricing optimisation
The design of printed circuit boards (PCBs) can be defined as a process of seeking the best layout of the connection networks for circuit components and electronic devices while retaining the desired levels of electrical parameters, e.g. impedance of differential transmission lines, thermal parameters (e.g. proper heat dissipation from SMD power components) and mechanical parameters (e.g. attaining sufficient rigidity at the given material thickness). The final design released for production is not always price-optimised. Prices are generally products of design production complexity. This article presents the most significant PCB parameters that condition the prices...