judith

China is one of the few countries in the world that have mastered advanced superconducting material technology Over the past decades, scientific and technological workers have been unswervingly committed to tackling key problems Expect to find more new superconducting materials And expand its application field through mechanical modification Superconductors are superconductors A conductor with zero [...]

The circuit board is particularly sensitive. If the potting glue is not used in the manufacturing process, once it experiences turbulence, it is easy to vibrate and collide with the electronic components, resulting in electric shock reaction. This situation is a fatal blow to the electrical appliances, so in the production process, the circuit board [...]

First, we need to prepare a scrap circuit board, hydrogen peroxide, toilet cleaner, gloves, goggles, disposable cups, beakers and coffee filter paper. Second, if the circuit board you are preparing is large, break it into a size that can be put into a beaker. The third step is to clean the dirt on the surface [...]

1. Weldment must have good weldability The so-called weldability means that the metal material to be welded can form a good alloy combination with the solder at a suitable temperature. Not all metals have good weldability, some metals such as chromium, molybdenum and tungsten have poor weldability; Some metals, such as copper and brass, have [...]

Layout is one of the most basic skills of PCB design engineers. The quality of the routing will directly affect the performance of the whole system. Most of the high-speed design theories must be realized and verified by layout. Therefore, wiring is very important in the high-speed PCB design. In the following, the rationality of [...]

Capacitor fault The fault caused by capacitor damage is the highest in electronic equipment, especially the damage of electrolytic capacitor is the most common. The capacitor damage is manifested as: capacity reduction, complete loss of capacity, leakage and short circuit. Capacitors play different roles in the circuit, and the faults caused by them also have [...]

FPC circuit board impedance refers to the parameters of resistance and reactance, which hinder the alternating current. Impedance is usually represented by Z, which is a complex number. The real part is called resistance, and the imaginary part is called reactance. The blocking effect of capacitance on alternating current in circuit is called capacitive reactance. [...]

Three proofing paint brushing Three proofing paint using brushing process is the most convenient and effective way of operation, this way of operation, for some circuit board surface components are more regular, circuit board area is relatively small, it is best on a surface, components distribution can not be too dense, different height, must ensure [...]

This capacitor should be a Y capacitor, which is mainly used to eliminate common mode interference. It is also the capacitance that is respectively bridged between the two power lines and the ground (l-e, N-E), which usually appears in pairs. Based on the limitation of leakage current, the value of Y capacitance should not be [...]

With the rapid development of integrated circuit industry, the demand for PCB circuit board only increases, but the market demand is large. PCB is the so-called printed circuit board, which is the support of electronic components and the indispensable carrier of electronic printing. At the same time, there are many PCB circuit board manufacturers, so [...]