1996 Audi A6 speaker circuit diagram as shown
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What is PCB board?
PCB (printed circuit board) is a printed circuit board, abbreviated as printed circuit board, which is one of the important parts of the electronics industry. Almost every kind of electronic equipment, from electronic watches, calculators, to computers, communication electronic equipment, military weapon systems, as long as there are Electronic Components such as Originality Electronics IC, in order to make the electrical interconnection of electronic components (Electronic Connectors), all To use a printed board. The printed circuit board is composed of an insulating bottom plate, a connecting wire, and a pad for assembly and welding of Electronic Components, and has the dual functions of a conductive circuit and an insulating bottom plate. It can replace complex wiring and realize the electrical connection between the various components in the circuit. It not only simplifies the assembly and welding of electronic products, reduces the workload of wiring in the traditional way, and greatly reduces the labor intensity of workers; it also reduces the overall machine Volume, reduce product cost, and improve the quality and reliability of electronic equipment. The printed circuit board has good product consistency, and it can adopt standardized design, which is conducive to the realization of mechanization and automation in the production process. At the same time, the entire printed circuit board that has been assembled and debugged can be used as an independent spare part to facilitate the interchange and maintenance of the entire product. At present, printed circuit boards have been extremely widely used in the manufacturing of electronic products.
The earliest printed circuit boards used paper-based copper-clad printed boards. Since the emergence of semiconductor transistors in the 1950s, the demand for printed boards has risen sharply. In particular, the rapid development and wide application of integrated circuits have made the volume of electronic equipment smaller and smaller, and the density and difficulty of circuit wiring have become greater and greater, which requires continuous updating of printed boards. At present, the variety of printed boards has developed from single-sided boards to double-sided boards, multilayer boards and Rigid-Flex Boards; structure and quality have also developed to ultra-high density, miniaturization and high reliability; new design methods and design supplies And the board-making materials and board-making technology continue to emerge. In recent years, various computer-aided design (CAD) printed circuit board application software has been popularized and promoted in the industry. Among specialized printed board manufacturers, mechanization and Quick Turn PCB automated production have completely replaced manual operations. .
The creator of PCB is Austrian Paul Eisler (Paul Eisler), in 1936, he first used a printed circuit board in the radio. In 1943, Americans mostly used this technology for military radios. In 1948, the United States officially approved this invention for commercial use. Since the mid-1950s, printed circuit boards have only begun to be widely used. Printed circuit boards appear in almost every electronic device. If there are electronic parts in a certain device, they are all mounted on PCBs of different sizes. The main function of the PCB is to connect various electronic components to a predetermined circuit and play the role of relay transmission. PCB is the key electronic interconnection of electronic products and is known as the "mother of electronic products".
PCB features
The reason why PCB can be used more and more widely is because it has many unique advantages, which are roughly as follows:
PCB can be high density
Over the years, the high density of printed boards ( HDI PCB ) has been able to develop correspondingly with the improvement of integrated circuit integration and the advancement of mounting technology.
PCB high reliability
Through a series of inspections, tests and aging tests and other technical means, the PCB can be guaranteed to work reliably for a long time (usually 20 years).
PCB designability
The requirements for various properties of PCB (electrical, physical, chemical, mechanical, etc.) can be achieved through design standardization and standardization. In this way, the design time is short and the efficiency is high.
PCB manufacturability
PCB adopts modern management, which can realize standardization, scale (quantity) and automatic production, so as to ensure the consistency of product quality.
PCB testability
A relatively complete test method and test standard have been established. Various test equipment and instruments can be used to detect and appraise the eligibility and service life of PCB products.
PCB assembly
PCB products are not only convenient for standardized assembly of various components, but also for automated and large-scale mass production. In addition, PCBA Manufacturing assembles the PCB and various other components as a whole, and can also form larger parts and systems, up to the complete machine.
PCB maintainability
PCBA Manufacturing, because PCB products and various components are assembled with standardized design and large-scale production, these components are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored to work.
PCB has other advantages, such as miniaturization and light weight of the system, and high-speed signal transmission.
PCB function
(1) Provide mechanical support for the fixing and assembly of various electronic components such as integrated circuits, realize the wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provide the required electrical characteristics.
(2) Provide solder mask graphics for automatic welding, and provide identification characters and graphics for component insertion, inspection, and maintenance.
(3) After electronic equipment adopts printed boards, due to the consistency of similar printed boards, manual wiring errors can be avoided, and electronic components can be automatically inserted or mounted, automatic soldering, and automatic detection, ensuring electronic products The quality of the product improves labor productivity, reduces costs, and facilitates maintenance.
(4) In the high-speed or high-frequency circuit ( High Frequency Board ) to provide the required electrical characteristics, characteristic impedance and electromagnetic compatibility characteristics for the circuit.
(5) The printed circuit board with passive components embedded inside provides certain electrical functions, simplifies the electronic installation procedure, and improves the reliability of the product.
(6) In large-scale and ultra-large-scale electronic packaging components, an effective chip carrier is provided for the miniaturized chip packaging of electronic components.
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