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.
which makes the direction of high frequency, high power and miniaturization. High signal power, high current and high voltage put forward higher requirements for PCB surface copper degree and hole copper thickness.
PCBA welding processing, usually PCB board has a lot of requirements, and must meet the requirements of the board to accept welding processing.
the polymer resin containing phosphorus nitrogen compounds will produce non-combustible gas when it is burned. This gas can isolate the surface and air of the resin combustion
In a circuit with resistance, inductance, and capacitance, an obstacle to alternating current is called an impedance. Impedance is usually denoted by Z, which is a complex number.
Series inductors should not be used as secondary sensors, so they must be physically isolated from nearby movable conductive materials, or a shielded SMD inductor must be used.
printing material dry too fast, in the screen version dry plugging hole, printing speed is too fast, scraper strength is too high. Solution, should use volatile organic solvent slow printing material, with soft cloth stained with organic solvent gently cl
ad is a very important concept, PCB engineers must be familiar with it. although familiar, many engineers on the pad knowledge is only a little. The types and design standards of pad in PCB design will be introduced in detail below.
Telegram