How does the eight tails cat become nine tails cat in the end?


How does the eight tails cat become nine tails cat in the end?
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5. The design of PCB--design considerations and assembly rules

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. PCB design considerations Juvtmall ( a company supply PCB Prototyping, PCBA service and sell kinds of components, modules and so on) 
(1) avoid setting important signal lines on the edge of PCB, such as clock and reset signal. (2) the distance between the ground wire of the enclosure and the signal line is at least 4mm; keep the length and width of the ground wire to be less than 5:1 to reduce the inductance effect. (3) lock the device and line that identified location with LOCK function, so that they will not be misused. (4) the width of the conductor should not be less than 0.2mm (8mil). In high-density and high-precision printed circuit, the width and spacing of the wires are generally preferable to 12mil. (5) Routing in the IC pin of DIP package, 10-10 and 12-12 principles can be applied, as between the two pins by 2 lines, diameter of bonding pad  can be set to 50 mil, width and spacing of line is 10 mil, when only 1 line, diameter can be set to 64 mil, width and spacing is 12 mil. (6…
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1. The design of PCB--- brief introduction and design steps

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1.The design of PCB Juvtmall ( a company supply PCB Prototyping, PCBA service and sell kinds of components, modules and so on) 
In PCB design, the layout of the components and the wiring of the circuit are the two key links.
Layout, means the circuit device in the printed circuit board wiring area. Whether the layout is reasonable not only affects the wiring work at the back, but also has an important effect on the performance of the whole circuit board. After guaranteeing the circuit function and performance index, to satisfy the requirement of process, testing and maintenance aspects, components should be uniform, neat and compact  on the PCB, as far as possible to reduce and shorten the lead and the connection between components, in order to get symmetricalpacking density.
The position of each functional circuit unit is arranged according to the circuit process, the input and output signal, the high level and the low level part are uncrossed as far as possible, and the signal transmissio…
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4. The design of PCB-- PCB design related concepts

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6.PCB design related concepts Juvtmall ( a company supply PCB Prototyping, PCBA service and sell kinds of components, modules and so on)  Via holes: Once selected, be sure to deal with the gap between it and the surrounding each entity especially easy to ignore the gap between the line not connected to via hole of each layer in the middleand via hole, if it is a automatic wiring, can be in "number Via minimization" (Via Minimiz8tion) in the sub menu select "on" to automatically solve. The larger load flow required, the larger hole size required, such as the larger the hole in the power layer and the other layer.
Silk screen layer: For the convenience of installation and maintenance of the circuit, etc., it needsprinting logo and writing codeon the upper and lower surface of the printing circuit, such as component label and nominal value,the profile ofthe component and the signs of the manufacturer, date of manufacture, etc.Many beginners to designrelated content of the s…
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