Wafer testing is for each grain on the wafer for needle test, in the detection head mounted on a gold wire made of fine as a hair of the probe, and the contact on the grain to contact, test its electrical characteristics, unqualified grains will be marked,and then when the wafer according to the grain […]
Single point grounding means that there is only one physical point in the entire circuit system that is defined as the ground reference point, and all other points that need to be grounded are connected directly to this point. In low-frequency circuits, there is not much influence between wiring and components. Usually circuits with frequencies
To build passive power factor correction (PFC) circuits, we have traditionally relied on passive components such as capacitors and inductors to extend the current conduction angle and smooth the pulse to reduce harmonic distortion of the current. While this approach is simple and reliable, the size and cost issues of passive components come to the
“370 hr” is a common PCB material type, which is a high-performance epoxy resin matrix commonly used to manufacture electronic equipment that requires high-temperature and high-frequency performance, such as high-speed communication equipment or aerospace equipment. This material has good thermal stability and mechanical properties, making it suitable for complex circuit designs. It has an important
Splicing boards is the process of laying out multiple circuit boards on a single large size board to form an overall board assembly. The purpose of it is to maximize the use of board space, increase productivity and reduce costs. Methods of splicing boards1.V-CUTV-CUT is to draw a slot in the connection of two boards,
VCC is a common term in circuits that means positive supply voltage. In digital or analog circuits, developers often need a widely available power supply to ensure that the circuit can operate properly. In such cases, the VCC voltage is usually set to a fixed value, such as 5V or 3V, so that all devices
What is pcba number?PCBA number (or SN code) is a unique code used to identify and track product information on PCBA (Printed Circuit Board Assembly) boards. This code is labeled when the PCBA semi-finished product is put into production. The purpose of this code is to facilitate the traceability of the production process of the
PCB antenna, also known as printed circuit board antenna, is a form of antenna in which the antenna is printed directly on a PCB (printed circuit board). This type of antenna plays an increasingly important role in modern wireless communication devices, especially in mobile devices, IoT devices and wireless sensor networks, where it is widely
PCB silver plating technology refers to the PCB surface covered with a layer of silver metal process. Silver as an excellent conductive material, with good conductivity, oxidation resistance, thermal conductivity and other characteristics. Through the silver-plated processing, PCB conductivity has been significantly improved, while enhancing its oxidation resistance and thermal stability, thereby improving the performance
“GND” stands for “ground” in electronic circuits, and is the abbreviation of “Ground”. It can also be called zero point or system ground. It usually connects other components in the circuit to the ground potential to form part of the circuit. Ground is the reference point in the circuit. Its potential is zero relative to
PCB wiring is a critical step in PCB design, which determines the performance and reliability of the product. It refers to the process of rationally laying out and connecting wires, components, etc. on a circuit board when manufacturing a printed circuit board (Printed Circuit Board, or PCB for short). This process needs to follow certain
PCB CNC milling machine is an advanced point-to-point motion control system, which plays a key role in manufacturing high-precision printed circuit board through-hole. With the gradual miniaturization and refinement of electronic products, the printed circuit board conductive holes in the aperture, line width and line spacing requirements have become more stringent. Accordingly, PCB CNC system
What is pcb copy board?PCB copy board is a technical means, through the other people’s PCB samples for measurement, analysis and imitation, to complete the original product replication and improvement.It is widely used in the development and production of electronic equipment.PCB copy board is divided into hardware copy board and software copy board. It is
Mounting holes refers to the holes used to install the circuit board in PCB. These holes are usually located in the four corners of the PCB or along the edge, and are used to fix the position of the circuit board in the device, as well as to connect to the mechanical bracket or fixture
PCB reflow plate, also known as reflow board or thermal reflow board, is an auxiliary tool in the PCB manufacturing process. Its main function is to remove the solder paste or soldering material from the surface of the PCB’s pads evenly and quickly through the process of heating and cooling during the soldering process to
Circuit board component identifier is markings on a circuit board that distinguish components, connecting wires, and other information. They can be in the form of text, symbols, numbers, or colors to facilitate identification and assembly by engineers. The correctness and clarity of the circuit board identifiers are critical to the proper functioning of the circuit
PCB dimension tolerance refers to the PCB manufacturing process, due to a variety of reasons resulting in the actual size and design size of the deviation between the range. The size of this tolerance range directly affects the PCB assembly accuracy, electrical performance and the reliability of the final product. Therefore, strict control of PCB
Parasitic capacitance is virtual capacitance (usually unnecessary) between two conductive structures separated by an insulator. It is an effect in PCB layout, where the propagating signal behaves as if it is a capacitor, but it is not a real capacitor. Parasitic capacitance usually occurs between any pair of conductors separated by a dielectric. These capacitances
Soldermask, as a thin layer of polymer, serves the primary purpose of protecting the copper layer on a circuit board from the risk of oxidation and short circuiting during manufacture and use. At the same time, it provides the PCB with an additional layer of environmental barrier. The thickness of the soldermask is usually closely
PCB via filling technology mainly refers to the use of specific filler materials to fill through holes (such as through holes, mounting holes, etc.) in the PCB manufacturing process, in order to realize the electrical connection between the layers of the circuit board or structural fixation. The selection of filler materials and the control of
During the PCBA processing process, some electronic components with poor welding are often encountered. Desoldering is required during the adjustment and maintenance process, or when electronic components are replaced due to incorrect welding. In the face of such electronic components, we generally remove the wrongly welded electronic components without damaging the PCB board. If the
Flex cut technology usually refers to the use of lasers or high-precision mechanical tools to cut circuit boards made of flexible materials (e.g. polyimide, etc.). This technology is known for its high precision, efficiency and flexibility to meet the needs of cutting complex shapes and small sizes. This technology typically uses a laser or mechanical
Automatic soldering is the process of welding using automated equipment and robots. Automated welding offers significant advantages over manual welding. Due to the precision and stability of automated equipment, automated welding can significantly improve the consistency and quality of welds. This means that consistent quality is maintained in every welded joint, which reduces the likelihood
Circuit board in the process of use, often appear pad off, especially in the circuit board repair time, in the use of soldering iron, it is very easy to appear pad off the phenomenon, in this paper on the pad off some analysis of the reasons, and how to fix pcb solder pads put forward
