Throughout deep space exploration, bioengineering, medical instruments, analytical instruments, high-energy physics research, biological origin, archaeological research, and high-end instruments for material evidence identification in criminal investigation, all imported instruments dominate the world and are based on simulation technology. For example, Hubble telescope, black hole exploration, gravitational wave detection and satellite photos are the data obtained by using them. The input and output of inertial guidance systems, mobile phones, base stations, computers, televisions, cameras, scanners, cameras and other information equipment are mostly analog processing processes, but digital processing processes are adopted in the middle. Nowadays, analog and digital hardware parts and even software are integrated. Without the basic design ability and semiconductor process equipment, we can only adopt the system integration method. The superior strength and greatest ability are algorithms and the use of DSP. To make a big platter of goods on the market, we must use other people's core hardware and software, leaving the back door wide open and introducing security risks. Therefore, in theory, it is a half-empty crane, in application, it is the final consumer, and it will always be in the downstream of the industrial chain.
Einstein's theory of relativity was put forward based on a large number of physical and astronomical experiments and observation basic data obtained with advanced hardware at that time. There are many graduate students who have no real understanding of the basic components of the circuit. Under this premise, it is impossible to make a decent basic circuit by relying on circuit simulation software.
Therefore, students should first use analog pointer multimeter to establish perceptual understanding and imagination. Chinese people are good at abstract thinking because it takes a long time and costs a lot to cultivate deep correct intuition, and few people can cross the threshold. In contrast, it is too easy to play with math and English, recite formulas, solve exercises and quote documents.
With the common teaching methods, teaching syllabus, teaching materials and experimental devices in China in recent decades, plus innovative projects, even Peking University and Tsinghua are unlikely to cultivate people who can skillfully design circuits. At least more than ten basic circuits should be designed and debugged completely; It is the most basic education to systematically design and integrate more than ten application combination designs.
there are more countries that can build satellites, launch vehicles and nuclear weapons, and the symbol representing their industrial base and overall innovation ability is how many of the basic materials, precision processing equipment and precision instruments are made in China? What is the international level of basic industries? I have worked in a military enterprise, and I know that the key technologies of national defense industries in all countries are bought and sold with the strength of the country. As a result, industrial products produced on a large scale by others, even if you manufacture them at a higher production cost, can not achieve the performance and reliability of others. Under the condition that the industrial infrastructure is not solid, the modern industry is not perfect, and the national quality is * *, to keep up with the development of the world and the urgent pressure of economic form, we can only focus on information construction, which is bound to be stretched, and we must make up for it; Jerry-building in housing construction has caused hidden dangers, caused discord in the neighborhood, and disputes have continued. Therefore, the waterproof and leak-trapping industry has flourished, and the waste of social resources is huge. When building a house, you can look back with a little attention and spend a little money.
It is suggested to carry out free online video tutoring activities, with the whole process recorded by high-definition video, compiled and published publicly.
The above contents were written independently and typed word by word on Baidu's website. In the future, academicians, doctoral supervisors, deans, principals and ministers should be responsible for answering these questions online.
what is an analog circuit? The most difficult and basic thing is that under the premise of limiting discrete components and general integrated circuits, undergraduates can't do it, and postdoctoral students can't do anything. This kung fu is so tough! ! ! Different from math problems and foreign language homework, it can be solved by raising one academic level; Doing business, making achievements, and playing stocks can cover up problems with high investment, which is not feasible here! ! Whether it is analog circuit technical indicators, special functions, analog computers, etc., it is hard work! ! ! Many parameters can be calculated or debugged, and they are based. This is not a skill that can achieve the same effect by downloading circuit imitation, but a complex and flexible way of thinking in space and time. We should also fully consider market supply conditions, customer requirements and the highest level in developed countries. The thinking mode of mechanical mechanism design and special processing technology is similar. I am good at this. I have contacted many publishing houses, and I am willing to provide a complete set of innovative teaching materials from basic circuits to high-performance application examples. They are unwilling to publish them. What they want is the original textbooks translated from abroad and copied from foreign textbooks. Now we are seeking sponsorship from large enterprises. Please contact the director of the State Council Overseas Chinese Affairs Office for details. Analysis on the Present Situation and Countermeasures of China's Industrial Development under the Economic Crisis; The competitive advanced product design materials, process know-how, processing skills, debugging principles and sales strategies are completely disclosed free of charge, allowing enterprises to simplify and industrialize. I contacted the publishing department, but they refused. People's first cognition is the most important thing. Nowadays, teachers' level and ability are generally low, and they can't cross the threshold. They can't answer students' questions in class, laboratory and graduation design. Those dozens and hundreds of pages of mathematical formulas were copied from original foreign books, and then they copied the translated textbooks. The basic circuits can't be designed and debugged, so your youth was ruined! What are the characteristics of the circuit structure of high-frequency power amplifier? I have a deep understanding and debugging details on the high efficiency, high reliability and no tube burning of high-frequency power amplifier. Because I was forced to be laid off, I will not introduce it. After I was laid off, I still kept thousands of high-frequency ceramic skeleton coils. With a high-frequency current output by 3DG12 oscillation coupled by a capacitor, I can light the indicator bulb of the electron tube radio. This is an incandescent lamp with a rated voltage of 6.3V and a working current of over 1 mA. I have contacted many publishing houses for more than 3 years, but they are unwilling to publish; Originally, it was to be sold at a cost price of several tens of yuan, together with the debugging details, involving many kinds of actual circuits, which were not included in the existing science and technology books and textbooks, and the imported version of the solid-state circuit textbooks did not include these contents. Under the administrative order of the deputy sheng-level cadres who were treated as ting-level cadres, these high-frequency ceramic skeletons were all destroyed by the Landscape Department. Take the low-frequency analog circuit as an example. When undergraduates are powerless, it is useless to go to graduate school. This is different from mathematics, foreign languages, Chinese, mechanical processing, bioengineering, etc. Some middle school students can't do the college entrance examination questions, but it is possible to do them with a higher degree. This translation and writing pupil can't do it, but a high degree can do it, and no masterpieces can be created; If this part can't be processed, the imported processing equipment will be solved, and the material manufacturing level is always stagnant; Under this genetic condition, the research level of the project can't be done, and the imported reagents, equipment and the latest foreign literature will be brought down, but the localization of imported reagents will be impossible for a long time; No matter how high the level of bicycle thieves and locksmiths is, they can't manufacture precision mechanical locks in developed countries; The medical skills of clinicians and surgeons are brilliant, and they can't produce advanced diagnostic instruments, surgical instruments and medicines; No matter how long the pilot can fly safely and fly over complex climate and environmental conditions, he can't make a large plane or a high-performance plane. As far as analog circuits are concerned, downloading circuits from the Internet is incomplete. Without knowing the design process, it is impossible to adjust to the best technical indicators. For high-frequency circuits, there must be design basis and debugging basis, which are not available in the market, schools and literature libraries. Only a few people can sell integrated circuits if they can. No matter how skilled you are in using integrated circuits, you can't use discrete components again. It is the best among people to design integrated circuits with imported software containing device architecture, but the integrated circuits designed with millions of dollars of software can't capture the international market and the domestic market, and can't get back the capital and get stuck. "Analog Electronic Technology" Design Circuit Ouch, this is the basic kung fu 3 years ago. What age is this? I just went to the postdoctoral laboratory to ask, and the graduate students he led also shook their heads. They are masters in conquering the frontier topics of world science and technology and future Nobel laureates. Forget it, don't you just use integrated circuits? You're uncivilized! You've read bad books! ! ! Analog electronic problems About the rectangular wave oscillator with adjustable duty ratio, I realized it completely with domestic electronic components 3 years ago. The duty ratio is wider. The duty ratio is displayed by a pointer instrument, which can generate a peak voltage of ~ 3 volts. The output current is indicated by a thermoelectric effect high-frequency ammeter with a full scale of 5 amps, with a peak current of ~ 15 amps. The power transistor is 3DD11F, and many power transistors are connected in parallel. The minimum pulse width is 1 subtle. The pulse width and pulse repetition period can be adjusted independently (only when the duty ratio interferes). It can be called a high-power and high-voltage pulse generator, which is used for pulse aging of thin-film resistors and designed according to a standard of IEC. At that time, our talents graduated from middle school. Therefore, the system has changed, opened up, reformed, democratic and free, but the ability of the top scholar in the college entrance examination and postdoctoral fellow is not as good as that of myself 3 years ago. If you have doubts about the 24V DC wheelchair brake motor, please sell it to me. Today, I bought two imported ones, and I dismantled one of them on the spot, because it was stuck and repaired it on the spot. It is planned to lend all kinds of transportation device exhibits to local science and technology museums free of charge, and the design, procurement, assembly and debugging of its control part and transmission part will all be made public, allowing downloading, and CD carriers can be sold at cost. The modified Japanese moped controller has greatly improved the utilization rate of battery capacity, and its original design drawings have been provided to the person in charge of a science and technology museum for free, with 3 drawings. China's science and technology books, diplomas, academic qualifications and professional titles can't replace the above effects. If the official science and technology museum doesn't accept it, please set up a folk science and technology museum to provide effective and substantial original design materials to the vast number of visitors almost cheaply. This is true patriotism, that is, the most efficient use of resources, that is, the greatest contribution to society, that is, to fundamentally improve the quality of the people and enhance the international competitiveness of national industries. The large sales quota and market share of charged goods in the market are based on trade secrets and other hidden rules, even if the design and manufacture are advanced, it is not necessarily just. Your computer and mobile phone are high-end products today. Do their manufacturers teach you to start from the basics and create innovative products that challenge them? Their whole set of design, procurement, production technology and testing technology, not to mention the core and key, even the existing non-patented technology, are blocked! Therefore, China now says that we should "take the market and let the market test it". It is a great manifestation of incompetent management level. From the publication of basic skills and production know-how, we must uncover industry secrets in combination with the daily necessities used by the general public; For the world's leading high-end luxury goods with high physical cost and few customers, such as the next-generation keyboard, harmonious telephone, high-speed response keyboard for playing electronic network games, etc., to the highly reliable bicycle anti-theft lock, all kinds of practical design and production substantive materials should be published. By grasping both ends to guide, enlighten and inspire enterprises, individuals and students to design and manufacture a wide range of products with mid-range and market competitiveness, it is to improve the overall quality of the nation, which is what the ancients said; Take the law, only get it; Do you think the top candidates in the college entrance examination, postdoctoral students and doctoral supervisors are more effective? Talking about innovation and transformation is a waste of social resources, a waste of students' precious youth, and a ruin of their future, and they can't hold their heads in front of developed countries and multinational companies. It takes a lot of time and money to make hardware. There is no continuous experience for decades, no financial support, no production practice verification, no commercial practical advice. It is empty talk, and the people who can come out are very rare. One is the high elimination rate, the other is the lack of money and time support. More importantly, many people don't know where they are wrong at the end of their lives. What's not done well? I simply don't know what the best way is under the constraints of historical conditions and environment at that time. It's still excellent in science and technology, and it's affordable and convincing to take an examination of the top student in the college entrance examination! ! ! Employment is the overriding primary task and the foundation of human survival! ! ! Should the government give money to the poor? We should disclose all the information about the design, processing, adjustment and parts purchasing location of the exhibits in the Science and Technology Museum, teach people to fish, and improve the quality of the whole nation and people. Nowadays, the textbooks are all a big copy, and now it is fashionable for system integration and high-tech assemblers to spend money on it. Of course, the strategic secrets of the country should be kept strictly confidential, and the commercial secrets should be protected by the beneficiaries.
Academic research done with social resources abroad is generally completely open. Many research completed with national resources in China should be made public, and the teaching materials and experimental books in colleges and universities should be made public, otherwise academic corruption will be aggravated! This is the embodiment of being responsible for the use of national and social resources. In China, knowledge is made public, the competition of substantive content and technical means is made public, the actual device can be copied in a third party for free, the technical indicators can be measured by an independent third party, and the performance comparison data and indicators can be made public, which is the only way to completely improve basic education and cross the long-term threshold, and the state should pay the relevant fees; This is no substitute for plagiarism. The next-generation keyboard I designed 25 years ago has been made public for free in several industries because there is no patent application and no laboratory. Provide innovative exhibitions to science and technology museums and popular science exhibition halls, disclose all design, procurement, processing, debugging and maintenance materials, and improve the basic quality of the whole country. Who can tell me something about the 197s and 198s? Just tell me about the experience of the older generation. The textbooks, industrial equipment and technological innovation materials in the 197s were completely open, and the whole country learned from each other and exchanged without reservation. The utilization rate of raw materials and equipment was the highest, and all kinds of machine tools, automobiles, wire cutting machines, EDM machines, pumps, internal combustion engines, motors, clocks, bicycles, lamps and other spare parts were universal and interchangeable throughout the country. In the 198s, diplomas, academic qualifications and professional titles had the final say, and all of them were introduced. In the 199s, low-level repeated research blocked each other and were hostile to each other, and kept secret from the beginning of low-end products. As long as similar products were from different manufacturers, the components with the same function were specially made without interchangeability, which was extremely great.