The stability of multi-layer PCB material standard is the primary factor affecting the positioning accuracy of the inner layer. It is also necessary to consider the influence of the thermal expansion coefficient of substrate and copper foil on the inner layer of Multilayer PCB. From the analysis of the physical properties of the substrate used, [...]
Modern has very high requirements for electrical appliances and electronics. It must be safe to use, otherwise it cannot enter the market in large quantities. In order to avoid power connection between circuit board and circuit, circuit board potting adhesive is generally used for potting. The potted circuit board is wrapped by adhesive layer, which [...]
Sometimes customers often wonder what the process flow of PCB is, and even some peers who are new to the industry are confused. When making an inquiry, customers often say that the board is very simple, and you can tell the price. In fact, the process of PCB depends on the number of layers, vias, [...]
There are several real reasons: 1. Most importantly, in the UV exposure process of solder resist layer, the pigment needs to not absorb ultraviolet light as much as possible. The selection of pigments with stable high temperature performance, good affinity with solvents and meeting various electrical specifications is limited. Green, blue and red solder resist [...]
With the rapid development of large-scale infrastructure and industrialization in China, the output and consumption of aluminum profiles have increased rapidly. Now it has become a world-class aluminum profile production base and consumer market. China's industrial aluminum profiles account for about 30% of the total application of aluminum profiles, which are mainly used in automobile [...]
Convenience Principle Potentiometers, adjustable capacitors, key switches, adjustable inductors and other regulating devices are often used in the design of circuit boards. We may adjust these devices after designing the whole circuit board, Some devices such as keys may also become the opening keys of the circuit board. Therefore, when designing such devices, they should [...]
1. Manual visual test Manual vision testing is to confirm the component mounting on PCB through human vision and comparison. This technology is one of the most widely used online testing methods. However, with the increase of output and the reduction of circuit boards and components, this method is becoming more and more unsuitable. Low [...]
Take you to know the quality and welding essentials of stainless steel flexible waterproof casing During the use of stainless steel flexible waterproof casing, we will encounter welding work. Do you know the essentials of stainless steel flexible waterproof casing welding? Here is a detailed introduction: 1. The overall dimension of the welding seam of [...]
PCB circuit board is the basic electronic component of all electronic circuit design. As the main support, it carries all the devices that make up the circuit. The function of PCB is not only to combine scattered components, but also to ensure the regularity of circuit design and avoid the confusion and errors caused by [...]
These details require attention when welding flexible sleeves The diameter and length of the bolt connecting the flange shall comply with the standard. After tightening, the length of the bolt protruding from the nut shall not be greater than the diameter of the bolt. After the installation of threaded flexible casing, there shall be 2-3 [...]