For the setting of PCB wiring line width, two major issues should be considered: One is the amount of current flowing through it. For example, for the power line, we need to consider the current flowing through the circuit when it works. If the current flowing through is large, the line should not be too [...]
How to see the PCB anode and cathode 1. Large-area copper foil line is ground wire. The ground copper foil is usually thicker than the normal wire, and is connected everywhere on the circuit board. 2. The metal shell of components is ground wire. Some components have metal enclosures, such as switchgear, that enclose grounding [...]
In order to reduce crosstalk between lines, the spacing between lines should be large enough. When the spacing between the center of lines is not less than 3 times the width of lines, 70% of the electric fields will not interfere with each other, which is called the 3W rule. To achieve 98 percent of [...]
Six things to consider when passing a PCB schematic to layout. All the examples mentioned were developed with the Multisim design environment, but the same concepts apply when using different EDA tools. Initial schematic transfer Device information, meshes, layout information, and initial wire-width Settings are also transferred during the transfer of the schematic to the [...]
Decoupling must be handled in other ways, and we should choose a tight coupling between the signal and the current return plane. The advantages of a tight coupling between the signal layer and the current return plane outweigh the disadvantages of a slight loss of inter-layer capacitance. Therefore, the easiest way to improve the EMC [...]
The specialty is engaged in the electronic product SMT processing welding operator contact every day is printed circuit board, solder and flux related materials, tools, and other work. Therefore, in addition to paying attention to the above electricity safety, operators also need to master the knowledge of this aspect, in order to ensure their safety [...]
Copper foil: a negative electrolytic material, a thin continuous metal foil deposited on the base layer of the circuit board, which ACTS as the conductor of PCB. It is easy to adhere to the insulation layer, receive printing protection, corrosion after the formation of circuit patterns. Copper mirror test: a flux corrosion test using a [...]
The heat generated by the working of electronic equipment rapidly increases the internal temperature of the equipment. If the heat is not released in time, the equipment will continue to heat up, and the device will fail due to overheating, and the reliability of electronic equipment will decline. Therefore, it is very important to heat [...]
The disassembled waste printed circuit board is mainly composed of reinforced resin board and copper wire attached to it, with complex connection mode, high hardness and strong toughness. It is difficult to use a single crushing equipment for energy consumption, and there is no good balance between crushing efficiency and crushing effect. Therefore, two-stage crushing [...]
Multilayer circuit board processing technology is subdivided into many types of technology, we will introduce the multilayer circuit board processing technology types: Surface technology: hot air leveling (HAL), gold finger, Lead free spraying (Lead free), chemical (precipitation) gold, silver/tin, OSP, rosin treatment, etc. ● reliability test: open/short circuit test, impedance test, weldability test, thermal shock [...]