Abstract: Driving the electronic spacecraft of the Progressive Number, entering the base area filled with black holes from the launch area, some companions are bound by black holes, some are going to another world, you are fortunate enough to escape from the robbery to the collector, and get a strong suction fast. Crossing the collector area, roaming on the low-resistance wire, relieved. However, the road ahead is not as smooth as you wish, and the heavy load is hitting the wall everywhere... The ancients learned nothing, and they worked hard. If you ask the hardware quick method, it is like a floating sand building. Don't think that you can become a master after you see it. Of course, the author is not a master. It is a good thing to wear a stone. I would like to share my past experiences and glimpses with my classmates and friends who have just worked. If you are not full of economics, how can you export it into a chapter. But I feel that the book is a sea otter, I don’t know where to start? The textbook should be finished first. This is the basis. How do you count it? After reading all the content, all the formulas are deduced and the exercises are all done. According to the content taught by the teacher, it is only enough to cope with the exam. The title of the book is based on the basics. It is also a study, and I want to work in this industry. I haven’t even entered the door! As it turns out, the content that is often selected is often used in practice. Indifferent text, awkward formula, daunting? At this point you need a good teacher - interest. The source of interest may be different. For the e-sports, in order to find a good job, there is a desire to seek knowledge no matter how interested. The author's interest stems from the curiosity of childhood, always want to open the radio to see where people are, only to see a bunch of components. Later, the components of the bad electrical appliance were removed and nailed to the wooden board with a thin copper wire. Plugged in 220V, try to have any function, and the result is of course explosive. Until the fifth grade from the relatives to get some electrical maintenance books, from the 7-tube radio circuit to understand the concept of amplification, the fan secondary winding capacitance phase separation and the main winding to form a rotating magnetic field, rice cooker using ferrite Curie point Automatic tripping, the electronic world is full of joy. Everything that comes with electricity should have a glimpse of its principle, spread the old books, and copy the electrical circuit diagram of the electrical appliance. The profit is to buy a soldering iron and a pointer multimeter. A pile of fermented milk bottles holds a good class of RC transistors. Embark on this road of no return. After college textbooks are well-informed, you can first look for groundbreaking, principled books to study and see the technological development. For example, starting with the tube to study the amplifier, to understand the control of the gate bias on the anode current, how to set the operating point and negative feedback, to the transistor amplification and then to the integrated circuit, you will find that the JFET is similar to the tube. From electromagnetism to electrodynamics, solid physics, semiconductor physics to semiconductor device physics, and control theory. In addition, you can also study thermodynamics, optics, and advanced knowledge of the first level. These theoretical explanations can be applied to the problems in current engineering practice. The so-called "spiritual" phenomenon in circuit debugging is just that your level is not enough. Some design manuals and guides are application techniques that deal with the non-ideal characteristics of the device circuit. It is not difficult to understand without much derivation. Don't think that when the old knowledge is over, today's hot technology has long been theoretically studied. Now the hot AI, the Turing experiment was proposed in 1950, the IJCAI was established in 1969, and the first international neural network conference was held in 1987. Today, with the development of the network and the improvement of hardware computing power, the theory can be realized and applied in large quantities. Commonly known. The most important point, don't deliberately remember the conclusion, you have to deduct yourself. Some people think that why can't they be lively and lively, and there are a lot of formulas. In fact, technology is based on the basis of feeling. Any attempt to transform in an easy-to-understand way may deviate from the essence. People who are really interested are not boring. Those who are discouraged may not be here. Like "One Minute Understanding xxx", it is not enough for engineers to understand, and high-end technology is not easy to understand. The importance of practice is self-evident, and the verification of some conclusions and ideas is extremely impressive. In the past, a transistor audio amplifier was used, the bias current was set lower, and the AM line was received after the input line was lengthened, indicating that the triode emitter junction was detected at a low bias current, and the lead near the input terminal was in the ferrite core. A few turns around it are suppressed, indicating the role of the choke. Unfortunately, the resources available to students in practice in universities are still very limited. Even so, sometimes it can be modified. Before doing a boost inverter, without a high-power transistor, cut a gear with a thin piece of iron. The glue is fixed on the motor shaft of the recorder. The battery carbon rod is used as a brush. Breaking the switch, the power frequency transformer is used upside down to achieve the boost, but the transformer is hot, you must first turn it up and then use the carbon rod to close, to avoid the core saturation. In the course of practice, it is necessary to combine theoretical analysis and analysis. You will recognize the non-ideal characteristics of the device, why there is a lot of interference, noise, self-excitation, and the expected performance is not achieved. There are resistances and inductances in the conductors, capacitances between the conductors, thermal motion of the carriers to generate thermal noise, etc., but in most cases you are subconsciously idealized. Earth loop - Faraday's law of electromagnetic induction, multi-point grounding - the impedance of the wire can not be ignored, the common impedance, a little grounding - but Ohm's law, the non-ideal characteristic is the real component of the neglected distribution and the reality of the component Characteristics, this should be the case, and not much mystery. So there is no rich theory, no refining summary, relying on the experience of others, I don’t know why. Is it clear that the channel is so clear? Come to the active head to come alive. Diligent thinking, self-consciousness, triggering inspiration and generating a source of innovation. Think about the connection between knowledge and integrate it. A ring inductor, induced electromotive force U=Ldi/dt, and another form U=Ndφ/dt, what is the relationship between the two, combined with the amperage loop theorem, you will find the inductance and the number of turns, permeability The relationship between the magnetic circuit section S and the magnetic path length l is L = μN2S / l. According to the definition of the inductance, L=Ψ/i=Nφ/i also obtains L=μN2S/l, which is the same way. There are 7 basic units in the SI system. There are so many physical units in the current science and technology derived from it. Do you say that there is a close relationship between various knowledge? How large is the average electric field in the energized wire? It may be deduced. The result is the product of current density and resistivity. It is well known that the rate of electrical propagation is not the speed at which carriers move. So what is the average electron velocity in the actual conductor? The copper conductor cross-sectional area is 1mm2, the current is 1A. According to the relative atomic mass and density of copper, the molar density is 1.4 & TImes; 105mol/m3, the amount of 1mol is Avogadro constant, and the outermost layer of copper atom is 1 The electrons are out of bounds, then the free electron density is 8.4 & TImes; 1028 / m3, according to the current definition I = Q / t = vtSpq / t get the speed v = I / (Spq) = 1 / (1 & TImes; 10-6 & TImes; 8.4 × 1028 × 1.6 × 10-19) ≈ 74 μm / s, this is only an approximate value. Since the electric field has an electric field, the electron is not accelerated. The actual electronic motion will undergo acceleration, collision with the atom, etc. Collision and binding macroscopic resistance are equal to the macro electric field force. The electric field force overcomes the resistance and works to heat the conductor. This is the resistance. Bold assumptions and then proof. Friction-charged plastic can attract paper dust. Why doesn't the 220V live wire attract paper scraps? In fact, the former refers to the charge, and the latter refers to the current is electrically neutral. However, a metal ball connected by an insulating rod touches a voltage of 100V to the earth, which actually does not attract paper dust, but it is also charged. The sphere radius R is defined by the electric field Gauss theorem, voltage, and capacitance to form an isolated conductor ball capacitance C=4πε0R. The large metal ball capacitor of the table tennis ball is 2.2pF, and the charging power is 220pC when connected to the voltage of 100V. Of course, the spherical potential is only 100V after leaving the power supply. When charging 1.5μC (equivalent to the human body with 10kV static electricity, winter is very common) potential is 682kV, the surface electric field is very high. Whether you can attract paper scraps has not been tried, it takes a motor to charge such a high voltage. There used to be an electrostatic generator idea, a fixed, a movable plate to form a capacitor, when the movable plate is close to the fixed plate, the power supply charges the plate, and then the movable plate is driven by mechanical energy away from the fixed plate. And disconnected from the power supply, overcome the electric field force between the plates to increase the voltage between the plates (capacitance is reduced), reach the top connected to the output capacitor to charge it, then return to charge, and then repeat, so the input and output of the average current The same but the voltage becomes higher, the mechanical energy that drives the plate motion is converted into electrical energy. The experience of others, don't think about it and use it. For example, driving relays, many books say that the coils should be connected in parallel with a diode to absorb the back EMF. However, this is not suitable at all times. When the diode is forward-conducting, the voltage is reduced, the equivalent resistance is small, the time constant is L/R, and the current decay is slow, which causes the contact opening time to be delayed, and the time interval of insufficient suction becomes large. It is not enough to open. In some cases, a parallel resistor or a diode series regulator is required to increase the absorption voltage and cause the current to decay rapidly. For the time being, the knowledge is divided into principles and techniques. Using tools is a skill, but it should be based on principles. Just starting to learn and work, it is recommended to try to calculate as much as possible, reduce the dependence on tools, and also be good for growth. There is a circuit below, two four-wire resistors are connected in parallel, and the relationship between the output voltage and the input current, and the influence of each part of the resistance change on the output, can be written by a few pages of paper in the former calculation, which requires perseverance. To do a good job, it takes a long time to learn and accumulate, it is not easy. If you are determined to engage in research and development, then go on and on. Incarnation of Spoker, driving the electronic spaceship of the Enterprising, embarked on a journey to explore the unknown world. In the launch area, the offset has narrowed the depletion layer. You and a large number of small partners are easily driven into the base area by the electric field. This is a time-space filled with black holes. Some companions are bound by black holes, some are taken away. In another world, fortunately, the difficulty is always short-lived (the base is very thin). You are fortunate enough to escape. When you see it, most of your companions fly to the collector. Suddenly, they are pulled by a powerful suction. After crossing the empty collector's area and roaming on the low-resistance wire, I finally breathed a sigh of relief. However, the road ahead is not as smooth as you wish, and the load that is heavily resisting hits the wall everywhere and hits the red. Even if your spacecraft is swept away by the atom to run for it, it is hard to steal a spaceship to use the heat to escape from the devil's control. In the twists and turns, after the hardships and obstacles to reach the other side of victory, life is like an electronic trip!
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