Circuit boards, or printed circuit boards (PCBs), have evolved over a century to enhance automation and reduce wiring errors, come in various layers, and often have specific names like “motherboard” that can cause confusion regarding their classification.
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1. Used PCB circuit boards from mobile phones and computers contain valuable metals like gold and copper, making their recycling value over 30 yuan per kilogram, significantly higher than that of waste paper, glass bottles, and scrap iron. 2. PCB circuit boards typically show three main colors on their surface: gold, silver, and light red. Gold is the most valuable, followed by silver, with light red being the least valuable. 3. These colors indicate whether manufacturers have used cost-effective materials. The circuits inside mainly consist of pure copper, which oxidizes easily and thus requires protective coatings. 4. Contrary to common belief, large areas of circuit boards are often gold-plated rather than made of copper.
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Micro-assembly technology enables the high-density assembly of micro-small electronic components onto multilayer interconnection circuit boards, resulting in smaller, more reliable three-dimensional electronic products. It relies on advanced surface mount components and soldering processes, facilitated by sophisticated placement equipment and computer-aided design/manufacturing systems, to meet evolving demands for miniaturization and performance.
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The complex circuits on circuit boards are designed to bend and curve in order to ensure the stability of signals, prevent interference between different signals, and optimize the size and efficiency of electronic products.
Flexible PCBs are common, but can be too flexible. FPC stiffeners add rigidity, structure, and support. Different materials like polyimide, FR-4, aluminum, stainless steel are used. Stiffener thickness varies. Benefits include better handling, stress distribution, heat dissipation. Stiffeners are applied using pressure-sensitive adhesives or thermal bonding. They prevent parts from falling off, maintain circuit thickness, and aid in ZIF connector compatibility. Adding FPC stiffeners enhances performance and reliability of PCBs.
Automatic Optical Inspection (AOI) is an advanced technological device used for quality inspection of circuit boards, detecting defects, errors, anomalies, and ensuring quality and reliability through optical technology and image processing algorithms.
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Nickel plating is commonly used as a substrate coating for both precious metals and base metals on PCBs, providing wear resistance, as a barrier to prevent diffusion between metals, and meeting the requirements of hot-press welding and brazing.
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Nickel plating is commonly used as a substrate coating for both precious metals and base metals on PCBs, providing wear resistance, as a barrier to prevent diffusion between metals, and meeting the requirements of hot-press welding and brazing.
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The assembly of electronic products involves various technical techniques and requires trained and certified personnel to ensure quality and reliability.
FPC soft boards and Rigid-Flex boards are specialized types of circuit boards used in electronic equipment, providing flexibility and space-saving advantages. When designing PCBs with these boards, it is important to consider specific placement and wiring guidelines to ensure reliability.
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