Everyone is slowly coming from the rookie. . . Everyone has "the memory of the unbearable", what fun is there in the road to studying electronic?
A great god Layout is found in the corrosion tank. I can't imagine how he uses a macker directly to draw lines, how to divide the net table in your brain. This kind of miracle is comparable to the TXT direct outbound table and programmed directly with a binary editor.
Welding Ha, I used to like the plug-in resistance before, because it is easy to solder and cross-line, but since I work, I have never seen it. It used to be called for half a day in front of the welding 0805, 0603, and it feels refunds. It has now been 0201, seeing habits 0201, and then look at 0603 It is already a big substitute. (Some people are curious about 0201 hand welding skills. Here to correct everyone with hot air *, one is that many people think that the small element should be blown with the fine, the second is that many people think that the smashing element should use low wind speed. In fact, Blow 0201 It should be the thick blowproof plus 7 to wind speed .0201 The biggest problem is that the pad is small, the PCB is hot. When only two pads are heated with a small blow, a lot of heat is taken away from the pad, and once the forceps are blocked, they directly lost Wen caused the soldering. In addition, the small blowing is easy to lead to high local wind speed. PCB is uniform, blown off the pad or blowing the device is not surprising. The wind speed is soft, the heat is stable, the effect and reflow welder are similar, this is Positive solution .0201 positioning depends on flux clearance of oxide film and tin strength suction, this is not to emphasize it?)
Previously, the DC-DC was less, and the power supply chip was small, and there was a bunch of periphery. Hand welding is very troublesome. I feel that the three-end regulator is bunker. One can get the desired voltage, there is wood. Then use a three-terminal regulator. The time is odd, and the power is very powerful. It is very powerful. Something I have to have the required voltage. If you have a few diodes in series, you will consume excess voltage. . . I think it is stupid now.
I used to do a board, generally corroded single-layer plates, and the advanced a little double layer. There is no consciousness of design reference planes, let alone considering the backflow path, the line is connected. Then, it is a lot of EMI problems. If the students are lucky, the low speed circuit is not embarrassed. I remember to have a bad luck, a motor-driven super EMI coupled to a signal line, leading to various ways to run, and can't be found. Finally, the red painting the board is inexplicable, and it can't be said. Later, I saw Black Book (HSDD High Speed Digital Design), and many people always carefully design the first half of the signal circuit, and they gave God to God, they were really stupid. "Crazy face.
After learning, it will be too slow. Before you learn, I believe that no one will think that the analysis circuit should consider the speed of light (electrical signal is spread in vacuo). In fact, on the circuit board, the electrical signal is propagated at the speed of the radius of radiosity, generally approximately 6 mil / ps. This is a very pothole, a 2inch (5cm) of the line, and the signal transmission needs about 330 ps. In other words, for the GHz level signal, it is likely that the first state is just arrived at the receiving end, and the second state has been starting from the source end. At the same time, there is different levels at both ends of an ideal wire, which is how reversed it before. In the actual design, the length of the trace will result in parallel signal timing chaos. Some high speeds use a medium having a low dielectric constant to reduce the signal flight time.
Speaking of a story that is not studying, go to the university, learn the moderate electricity, what software should be used to make a trapezoidal hairculator, do not listen to the class ... Can't do it, 哧哧 哧 哧For half a day, do it is triangular wave, then get it, wave is gone ... no way ... use PS to put the top of the triangle, then paint a horizontal line ... Perfect trapezoidal wave ... Heart Huai put screenshots and procedures When I sent it to the teacher's mailbox, I went to ... later understood ... The teacher is too lazy to take my homework to simulate ...
To talk about two wireless communication modules, this module called NRF24L01 It is estimated that many people have used this god module. I will always start working for a while. I can't send it. The magical thing has appeared: you can send out the data with the pin of the module! Can I cut my hand down and stick it? ! Finally, the reason why a pin plus 10k drop-down resistor solved the problem has been unclear. When the big three-machine game is rotated inverted, it is detected that the inverted hiring angle wants to wirelessly send it to the controller to use this module to apply to the teacher to apply for the application "module" is not IC. Waiting for the device ... Looking at a big bag QFN package NRF2401 chip is really crying
The tantalum capacitor has a horizontal side. It is a positive ... I put the first time I was blown with a tantalum capacitor. Later, I found that the capacitor was reversed.
Bi a small company to do photovoltaic power generation, I do a power balance algorithm, there are several large capacitors to fight, because the inverting does not do the wave-shaped whispering, one boot with the table, is also very large. I am very scary, and then put the power to start a variety of explosions. The boss is always joking. The working principle of the electronic device is mainly the magic smoke in the inside. It is not working because of the burning magic smoke. I don't work. The embedded usual contact is 3.3 up to 5V. I have seen this boss. I said that I don't want to burn things to boil, I will learn new knowledge. Anyway, my last company is doing a vacuum high pressure relay. It doesn't matter. Later, I used the second version of the prototype to make a happy congratulations. The old version of the prototype boss took a fire to shoot a fire, and once went to the boss home to see his vacuum relay first generation prototypes used two IKEs. Buy high pressure cooker together ...
One day my embedded teacher let me go to him, help to repair a machine. At that look, this machine is called, [point instrument], listen to the name bunker? But even if there is anything in the instructions, I don't know what principle. If the person we repaired, it is used for the old man, and I don't know how to use it. I have been exploited for a long time, I understand the principle, I will determine my mind to do it in the industry. Why? People are stupid. Talk about this points. A wood box protrudes two large copper columns, like both ends of the metal nunchaku. You took one, I took one, then I used your skin, you feel this. Very magical? Oh, the root is a power source that adjusts the voltage value within a secure range. . . Two people take a copper column. After the finger contacts the skin, the loop is formed, and the local resistance of the point is high, and it will be numb. Why do people talk about people? This point is very tall, wooden box, with a slogan with the perfect combination of Chinese medicine and technology, and markes 998 explosion price, and absolutely kids the elderly. What is the inside? It is a circuit board that exchanges the DC, and there is no MCU. Ps later my belly black embedded teacher always tested this point, education, our most fragrant is the direction of hardware and software, which is the most profitable (PIAN).
14 years of summer vacation, TI cup, choose the electric energy wireless transmission device, the title requires a 20cm coil with a diameter of 20cm, the light has a story of countless dog blood, in the short four days and three nights XD. Everything is done by DC power! Training is a direct source! Linear switches are done! Voltage source current source has been done! Buck Boost has done it! Synchronous is not synchronized! PWM PFM has done it! We feel that it is basically ready! Give me a wireless charging! Mud! What is the antenna doesn't understand! Wireless this piece has not been done! So I opened my coil, which is more cool (easy to use)! I spent a whole day to see the papers! Then I said a big hand, no matter whether it is a coil, try to do it. Then let me go to the electronic market to buy a line! Do you have money, let me last! I want to call me! I am ignorant! What is the painting line? I said the most thicker! Give me 100m! The school brother said that the most thick diameter is 3mm, can't be achieved? I am talking! Come 100 meters! The school brother said that 100 meters people do not sell, buy 180! I said 180, 180, remember the teacher! (I won't tell you more than 800 bales. When the teacher asked the price, we were unimpeded to say qaq), and they called a big coated bag with a big coated bag ... I was shocked when I came back ... then I and I have two teams of the knife (big fog) of the knife, speechless ... This is how he is unhappy! Then we went to the line for a long time ... I have to be tired of the dog. I haven't played hard. After you are bending, you will rebound ... we have two people to press it (no one. Movedly, one person tied it with nylon tie, which is only fixed. The ugly strike, now I am not in school, I can't put a picture, wait for school, I put the figure. Still about that coil. You said that this is a question, and the coil diameter is 18 ~ 22cm (the result of the final test teacher did not test the diameter of the coil!) When we found out, how to do this, I propose to tear a paper The box, you can get a 20cm paper tube, get the line to the top! SO Easy! Ma Ma no need to worry about my study! Then I saw the school brother to come back to the claws of the claws. If this is to be deformable onto the paper tube! So I bought a bunch of nails near the hardware store near the school, wrapped around a 20cm diameter round ... The heavy rain is hard ... When I walked at the moment, I worked at the electrician. The white gloves often wearing, or have a very painful QAQ. Ti Cup Dogs That is also these ... In addition to the opening of the time, I am fascinated to wake up the teammates. When the table is, there is a thing that is worth the spit.
Once, it is a constant current source, small power, and the result is that the feedback is too close to the inductance. When the small current is stable, the current is all kinds, the LED effect is a flash of dog eyes. ……Twinkle twinkle little stars, how I wonder where you are. Magical is that every time I take an exclusive probe, I am stable, I want to see the waveform, this Nima ... Then I analyze two points, one is the interference introduced by the oscilloscope probe antenna effect. Other interference offset, then one is the effect of the oscilloscope input impedance. I feel that the first thing is too special. It is so smart. Then I checked the existence of 1M Euro // 10pf, and then I got a 1m European resistor and 10PF capacitance, 欸, a little effect. However, the current is low (about 1 mA) or it is not ... I will die as a living horse doctor, insert the root line ... The bedroom is actually good! I don't believe in love again! And the line should stand up to work ... Every time I look at the circuit, I am a blood ... but the hardworking children have encountered this problem. It must be refunded ... don't learn me. . I'm lazy.
The most exciting place. . .
When you don't get a waveform, we generally default oscilloscopes are bad - I will not admit that I am wrong with my circuit (╯ ^ ╰) ╮
Original link: https://www.eeboard.com/news/design-2/
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