What is the significance of laying copper on PCB

There are several reasons for general copper laying. 1. EMC. Copper laying on a large area of ground or power supply will play a shielding role. In some special cases, such as PGND, it plays a protective role. 2. PCB process requirements. Generally, in order to ensure the electroplating effect or the lamination does not […]

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Introduction to basic knowledge of PCB design

1、 PCB materials currently used by Mitac A. Urea paperboard Features: the color is light yellow, which is commonly used for single panel. However, it is made of urea paper, which is easy to rot in cool and humid places, so it is not commonly used now B. Cam-3 board Features: milky white color, good […]

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Analysis of basic principles of PCB maintenance

Principle 1: look first and then measure The circuit board to be repaired shall be visually inspected first. If necessary, it shall be observed with the help of a magnifying glass. Mainly focus on: 1. Check whether there is disconnection and short circuit; In particular, whether the connecting line of the printed board on the […]

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Analysis of line width and via of PCB

We generally have a common sense when drawing PCB, that is, thick lines (such as 50mil or even above) can be used for high current, and thin lines (such as 10mil) can be used for low current signals. For some electromechanical control systems, sometimes the instantaneous current flowing in the wiring can reach more than […]

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Causes and solutions of blackening of gold plating layer on PCB

Recently, we have received emails and QQ from our peers to talk about the causes and solutions of blackening of electroplated gold layer. Due to the production lines of each actual factory, the equipment and liquid medicine system used are not exactly the same. Therefore, it is necessary to carry out targeted analysis and treatment […]

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Introduction to SMT assembly process and welding process of PCB

SMT assembly process is closely related to each process step before welding, including capital investment, PCB design, component weldability, assembly operation, flux selection, temperature / time control, solder and crystal structure, etc. 1 solder At present, the most commonly used solder for wave soldering is eutectic tin lead alloy: Tin 63%; For lead 37%, the […]

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Introduction to etching process of printed circuit board PCB

1、 Overview At present, the typical process of printed circuit board (PCB) processing adopts “graphic electroplating method”. That is, a layer of lead tin corrosion resistant layer is pre plated on the copper foil to be retained on the outer layer of the board, that is, the graphic part of the circuit, and then the […]

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How to prevent board warpage during PCB manufacturing

1、 Why is the circuit board required to be very flat: On the automatic plug-in line, if the printed board is not flat, it will cause inaccurate positioning, the components can not be inserted into the hole and surface mounting pad of the board, and even crash the automatic plug-in installation machine. The board with […]

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Analysis on the method of PCB outline machining

1、 Processing method of printed board shape: ⑴ milling shape. When machining the profile with NC milling machine, it is necessary to provide milling profile data and corresponding pipe position hole files. These data are provided by programmers. Since the splicing spacing of printed boards cannot be large, which is generally about 3mm, the diameter […]

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