PCB Technical - ​Read the wiring analysis of the PCB circuit board

The name of the circuit board is: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, impedance board PCB. Ultra-thin circuit board printing (copper etching technology), circuit boards, etc. The circuit board plays an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances. The circuit board can be called a printed circuit board or a printed circuit board.. The English name is PCB (FlexiblePrintedCircuitBoard). Excellent scratchable printed circuit board.. It has the characteristics of high wiring density, light weight, thin thickness, and good flexibility. Rigid-flex board (Reeechas). The birth and development of FPC and PCB have led to new products of soft and hard board. Therefore, the rigid-flex board is a flexible circuit board and a rigid circuit board combined according to the requirements of the relevant process. Circuit board with FPC characteristics and PCB characteristics.

According to the number of layers, road boards are divided into three categories: single-sided, double-sided and multilayer circuit boards. First, the single board is concentrated on one of the leads of the most basic PCB part. Because the wires only appear on one of the sides, it is called a single-sided circuit board. Single-sided boards are usually simple and low-cost, but the disadvantage is that they cannot be applied to overly complex products.

The panel is an extension of a single panel. When single-layer cables cannot meet the needs of electronic products, double-sided panels must be used. Both sides are covered with copper wires, and two layers of wires can be introduced through the holes to form the required network connection.

Multi-layer board refers to the mutual compression of more than three conductive pattern layers and the insulating material between them, and the conductive patterns need to be connected. Multilayer circuit boards are the product of the development of electronic information technology in the direction of high-speed, multi-function, large-capacity, small volume, thinness and light weight...

Circuit boards are divided into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB) according to their characteristics.

Usually, the whole machine consists of several printed circuit boards. The circuits on each printed board are often drawn on circuit diagrams. Therefore, the circuit diagram of the whole machine is usually composed of circuit diagrams of several sections to understand the circuit diagrams of each section. The circuit diagram of each section contains one or more circuit systems. The complexity of the circuit diagram of the large-scale plate is almost the same as that of the ordinary small and medium-sized screen TV. Although the circuit is more complicated, the various plate circuits have different functions, but they have rules to follow and can be read in a certain way.

In order to read the circuit diagram, the correct graphics reading method and steps should be adopted. Usually adopt the method of peripheral packaging from the outside to the inside. Using the method of combining internal and external connections and gradual breakthroughs, all circuit diagrams can be read more smoothly. The specific methods and steps of looking at the picture can be summarized in three words and three steps: choose the entrance from the periphery; open the gap before and after contact; the difficult analysis is the last.

In other words, first look at the most intuitive and easy-to-read components and circuits at the edge of the circuit as the entrance to the drawing. Some circuits or integrated blocks can be found along the signal line (which may be the opposite of the signal flow direction).

Open the gap and contact the front and back.

There are weak links in reading in any circuit diagram. The simplification and difficulty of each part of the circuit are always different, or the graphic symbols of some parts are different from general parts. These parts are weak links inside the drawing and are easy to read. They can be used as an internal breakthrough in the picture. You can choose these places as a breakthrough in drawing reading to open the gap, quickly contact back and forth, and read a large number of circuits together with the first method.

As long as readers notice that there are always many links familiar to readers in the circuit diagram to grasp it, they can quickly open the blank of the picture and develop in depth. The most intuitive and easy-to-read internal links are integrated circuits, especially large integrated circuits, and their introduction is enough to exceed 40 feet and more than 100 feet. The painter is too.

They are usually placed in the center or obvious location of the circuit diagram. Then expand with these integrated circuits as the center.

Many circuits. The use of integrated circuits as an internal breakthrough requires prerequisites. Must understand the specific model of the integrated circuit, and understand the main functions of the integrated circuit. Familiar with the name and purpose of the foot, otherwise it will cause great inconvenience to reading. Sometimes readers are familiar with most integrated circuits, but are not familiar with individual integrated circuits, and can guess the function of unknown integrated circuits based on the block diagram and the context.

The PCB circuit diagram also has some content that is easy to read and remember, and it can also be used as a breakthrough in the circuit. For example, some important and easy-to-read component graphic symbols marked with Chinese letters or abbreviations in the figure, such as some adjustable resistors or potentiometers. In order to use these breakthroughs conveniently and smoothly, readers should be familiar with the physical meaning of various foreign language abbreviations. Have a certain foreign language foundation (usually English). The reader should be familiar with the professional terms and abbreviations commonly used in audio-visual equipment, and the reader should be familiar with the functional parameters and indicators of these components. The reader's knowledge is extensive, which helps readers to consciously remember some useful common sense.