Multi Layer PCB

Whether it is the layout of the devices on the PCB board or alignment and so on have specific requirements. For example, the input and output lines should try to avoid parallel, so as not to generate interference. Two signal lines parallel alignment is necessary to add ground isolation, two adjacent layers of wiring to try to perpendicular to each other, parallel easy to produce parasitic coupling. Power and ground should be divided as far as possible in two layers perpendicular to each other. Line width, the digital circuit PCB available wide ground line to make a circuit, that is, to form a ground network (analog circuits can not be used in this way), with a large area of copper laying.

Single-sided circuit board inspection defect definition.1, PT surface: soldering surface.2, MT surface: parts assembly surface.3, light defects: because of its poor quality, may make the performance of the printed wiring board has been reduced, life has been shortened.4, minor defects: due to its poor quality may reduce the value of goods, but does not affect the performance and life of the printed wiring board, etc..5, conical hole: due to the stamping model of the upper type perforation and the lower type of the hole gap is too large, stamping perforated parts, such as the shape of the hole section to the assembly side of the parts open horn shape.6, heavy defects: due to its poor quality so that the printed circuit board can not be used for the intended purpose.

Many customers looking for PCB circuit board manufacturers , do not know how to choose, not a careful selection of small processing plants, small workshops, talk in front of a good, the next second turn hand to place orders to other manufacturers of strength for prototype production, so that a lot of wasted time. When looking for PCB circuit board manufacturers, be sure to go to the factory for a survey, so that you can actually identify the strength of the manufacturer.

In the process of designing high-speed PCB circuit boards, the seemingly simple over-hole, a silent is likely to bring a great negative effect on the circuit board. Today WeiFu circuit board manufacturers to tell you how to over-hole design in the high-speed PCB circuit board, to reduce the adverse effects of the parasitic effect of the over-hole:.