must try to be dispersed or diluted or offset, in order to maintain the good operation and performance of the machine. Available methods such as air convection cooling, add heat sink, or set up a variety of refrigerant pipelines, are called heat dissipati
It refers to a way of connecting the circuit board with the outside world, that is, on the board has been soldered gold guide Pin (or Post), in order to remove the skin of the metal wire winding, tightly wound on the tip column to complete the connection.
this method can be used for imaging inspection of the sealing quality of the packaged traditional IC or the densely assembled PCBA. There are two practical models of laser Scan (SLAM) and C-mode scan (C-SAM) on the market.
The measurement method is to dissolve the sample in hot alcohol with titanium phenol as an indicator, titration required potassium hydroxide milligram number, namely its acid value.
Ordinary PCB is usually made of copper foil and substrate bonding, and the main material of ceramic substrate is alumina, beryllium oxide, aluminum nitride and other metal oxide ceramics, the performance of the two is quite different.
the process requirements of PCB circuit boards in each industry have gradually improved. For example, gold and copper are used in the circuit boards of mobile phones and computers.
In this paper, the design of PCB Roche coil and integral circuit board will be introduced in detail, the frequency characteristics of the system will be analyzed by PSpice simulation software, and the existing experimental conditions will be used to build
Halogens are halogens in the periodic table, including fluorine, chlorine, bromine and iodine. Halogen-free board is to replace or replace these harmful elements to achieve environmental protection and non-toxic PCB.
The following processes of PCB circuit board production need pure water cleaning: copper plating, gold plating, silver plating, nickel plating, tin plating. Can be used for multilayer circuit board, double layer circuit board and single layer circuit boar
The presets need to contain both electrical and structural reliability. Generally in the preset very high speed PCB wrench (greater than GHz frequency) this board problem will be relatively tight.
At present, the global PCB enterprises are mainly distributed in China, Japan, South Korea and other places. The downstream application field of PCB industry is very wide, which is less affected by a single industry, so it is relatively dispersed, with ma
PCB surface needs to be welded components, so a part of the copper layer needs to be exposed for welding. These exposed layers of copper are called pads. The pad is generally rectangular or circular, and the area is small.
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