After the Spring Festival, take a look at his aunt's account with only two digits of gold. He must write something to mix gold coins. Just recently entered a pair of Sony's old flagship moving circle EX1000, simply basking in the sun, talk about hearing it. This plug is used in good friends where the second-hand, good condition, 1200 yuan to get very valuable. Not new, so some of the out-of-the-box links are not available, give everyone a link to Jingdong. The headset has been available for a long time and should be the longest-lived domestic model in Sony headphones. Frankly speaking, the EX1000 is a bit weird and not comfortable. With more than 2 months of experience, there are obvious feelings of discomfort when wearing the ear for more than one hour. As you can see from the above image, the cable connected to the headset can be adjusted greatly, and the hand feels good. Earphones work well, after all, is the flagship product. There are always Tucao points that headphones are easy to get rid of paint. My own experience shows that it is relatively easy to be injured. It is recommended to prepare a velvet storage bag. The original storage box looks good, but it is not practical. The rotary design of the EXK headset and wire connection is easy to disassemble, but from the perspective of its own use, the rotary design is still relatively easy to loosen, and when the song is often heard, there is no sound, and the rotary design is easily released. Did not dare to screw too tight, or afraid to screw. The fuselage has the product model EX1000 and instructions made in Japan. Dafa is now producing a lot of audio products in Malaysia. The EX1000 is still a conscience product. Made in Japan is also considered a guarantee of quality. A set of headphones detached from the wire, the plug is not large, it can be said that the unit volume of 16MM can be controlled into this is already very good, the key is not the kind of XBA-H3 feel like the ear plug USB, weight control is also good. The shape is certainly not good-looking, but it is not ugly. After seeing the bizarre appearance of a large number of moving iron headphones, I feel that the EXK is quite good looking. The two left and right headphone jacks have been designed in different colors. Dafa is still very user-friendly in terms of details. It is convenient for everyone to install the wire. On a few more close-ups, I prefer the design of the matte part of the shell, which is all better if it is matte. The wire is very soft, and the original one has two lengths and one short, but too frankly speaking, the short line is too short to be used basically. However, the design is not the same as a general in-ear stopper. This basically doesn't feel like a stethoscope. It's awesome. The left and right interfaces of the wire are different in color, and the design that is easy to distinguish is still very good. However, the wire interface is still very fragile, must be gently twisted, the direction can not be wrong, otherwise the plug is estimated to be scrapped. The interface design of the EX1000 is indeed weaker than the Dafa new style ring iron interface. The L interface cable is very easy to distort the change, Sony is also specifically dealt with to ensure the safety and reliability of the wire. As a guy who has often broken wires, this design is very important. The conscience of three kinds of plugs to meet the needs of different sense of well-being, and the size of plug sleeve design more to meet the needs of different ear canal customers. If the original Dafa accessories have a storage box that can be used to receive plugs, it will be even more perfect. Whether there is a large amount of stuffed clams in Ukrainian arteries, there is a sense of value for money, haha. However, I do not like tossing, and now have not changed the plug. The original protective cover that looks very tall, works very well, has a high weight, and is 100% faithful, but it is super hard to use from the point of use. This is probably the case with Open. Basically, it is very difficult for you to put the stopper on the collection box. It is more convenient for everyone to buy a velvet storage bag. Overall sense of hearing: The portable front-ends on the hand include NW-A15 and NW-ZX100. On the whole, the NW-A15 can be heard with the EX1000, but it is obvious that the thrust of the A15 is not enough, there is a feeling of a small horse-drawn cart, and the strength of the EX1000 is not shown well. The thrust of the ZX100 is larger, and matching the EX1000 to the street is very good. The EX1000 sound positioning is more accurate and the sound field feels just right. The ZX100+EX1000's collocation feels more balanced in terms of tri-band, especially voice analysis is in place. However, the tooth tone is still quite obvious. This depends on personal taste. The sense of low-frequency volume is good, and the dive is in place. There is no obvious sensation of boring. It is the type I like. Compared with the XBA300AP, although the EX10000 No. is called moving iron in the circle, the resolving power is still insufficient compared with the XBA300. Fortunately, the EX1000 sounds relatively balanced, with no obvious short board. From the perspective of different genre tests, the EX1000 is still very good in terms of vocal performance, and the transient effect is still good. Rock and pop are particularly comfortable, but listening to classics is clearly different from IE80. The style of IE80 is more appropriate for listening to classical music. The main advantage: 1) Three-band equalization, vocals are particularly comfortable, and feel more fluid. In addition to the classical omnivorous headphones, dynamic iron in the dynamic circle has a good analytical power. 2) The stethoscope effect can be ignored. For in-ear headphones users, this experience is simply stunning; 3) Exquisite workmanship, rich accessories, wire can be replaced; 4) Now that the price is very reasonable, the price of 2000 is worth entering; The main drawbacks: 1) To paint off, paint off, paint off; 2) The tooth tone is a bit serious, but I can accept the tooth tone. 3) It is uncomfortable to wear the ear for a long time. This estimate is related to the wearing design. 4) It takes too long to come out, the original packaging is not sealed (my friend told me), there is no HIRES Belief. In general, if you have a good front end, you can try this dynamic headset with a very reasonable price, and maybe you have a pleasant surprise. Come here, see you next time. Welcome friends value me with gold coins.
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.
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Sony (SONY) MDR-EX1000 headset dynamic flagship black 2388 yuan Sony classic dynamic flagship Jingdong direct link View Encyclopedia 
7n oxygen-free copper interface, workmanship is very pleasant, there is not a lot of headphone jack polished feeling with burrs, the work of first-line manufacturers is still great. 
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.
