Dircuit Diagram

Circuit definition: with wires to the power switch (key), use electrical appliances, ammeter and voltmeter connected to form circuits, according to a uniform symbols representing them out, so drawn out is called the circuit. 
Significance 
Circuit is that people need to research and engineering, using the state standardized symbols to draw a representation of the various components of the composition of the graphics. Through detailed circuit diagram can know his works, is to analyze the performance, installation of electronic products, the main design file. In the design of the circuit, they could easily be on paper or computer, and then confirm the actual sound installation, debugging, improving, until the success; now, we can apply advanced computer software for circuit-aided design , or even virtual circuit experiment, greatly improved work efficiency. 
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Often encountered in electronic circuit schematics, block diagrams, printed board assembly diagrams and maps 
(A) schematic diagram, also called "electric schematic." This figure, as it directly reflects the electronic structure of the circuit and working principle, it is generally used in the design, analysis circuit. Analysis of the circuit, by identifying a variety of drawings drawn on the circuit component symbols, and the connection between them, we can understand the circuit diagram when the actual work is used to reflect the electronic circuit works as a circuit situation. 
(B) block diagram (block diagram) is a block diagram of a box and connected to said electrical circuit diagram and composition profiles. Fundamentally, this is a schematic, but in this paper, in addition to boxes and connections, almost no other symbols. The schematic above it and the main difference lies in the detailed schematic drawing of the circuit on all the components and their connections, rather Fangkuang Tu simply a circuit is divided by function into several parts, each depicting a part of the into a box in the box with a simple text description, with the connection between the box (sometimes connected with arrows) shows the relationship between the various boxes. Therefore, the circuit diagram can be used to reflect the general working principle, and in addition to a detailed schematic diagram shows the circuit works, it can also be used as a capture device, making the circuit basis. 
(C) the assembly drawing is to be used as a circuit assembly and drawings, the symbols on the map is often the shape of the circuit diagram of physical components. As long as we draw the map according to the way, and write to some circuit components connected to the circuit to complete the assembly. This circuit is usually used for beginners. Assembly drawings based on the differences in the assembly template is not the same, most of the occasion as electronics, are used to introduce the following printed circuit board, so the printed board assembly drawing of the map is the main form. In the beginner electronics knowledge, a little earlier in order to access to electronic technology, we use a screw plate as the basic installation template, will install the map into another mode. 
 (D) printed board diagram printed board diagram full name is "printed circuit board" or "PCB map", it actually belongs to the same type of assembly drawings of the circuit, are used for the assembly of the actual circuit. Printed circuit board is covered with an insulating layer of metal foil board first, then the circuit does not require a metal foil etching away the remaining part of the metal foil as a circuit between the cable components, then the circuit element piece of insulation board installed in the device, use the rest of the board between the conductive metal foil as the connection components, complete the circuit. Because of this the board of one or both sides of the metal is copper covered, so the printed circuit boards known as "CCL." Distribution of printed board component diagram and schematic are often quite different. This is mainly because, in the printed circuit board design, the main consideration of the distribution of all components and connections is reasonable to consider the component size, heat, anti-jamming, anti-coupling, and many other factors, the combination of these factors out of the printed circuit board design , and from the outside is difficult to exactly the same diagram; in fact able to better achieve the circuit function. With advances in technology, the production of printed circuit board technology has now been greatly developed; in addition to single-sided, double-sided, there are many panels have been applied to a large number of daily life, industrial production, national defense, aerospace industry, and many area. In the above described four forms of the circuit, the schematic diagram is the most common and most important, able to read schematics, also mastered the basic principle of the circuit, draw the block diagram, design assembly drawings, printed board diagram that are more easy. Mastered the schematic, the electrical maintenance, design, is also very convenient. Therefore, the key is to master the schematic.