Tech house system

Chapter 67 Square Wave Generators

Zhou Quan left due to an urgent mission, and Wei Shuxun became a freed child again.But because of a sense of urgency, the progress of these 12 days of tutoring is much faster than when I was with the girls, and the time is also longer. I often have tutoring until 12 o'clock in the evening, which is why Wei Shuxun had to stay at Zhou Quan's house.

In just 12 days, with the previous tutoring, Wei Shuxun can basically keep up with the current course, as long as he consolidates, it doesn't matter if he doesn't have tutoring, and the task progress of the learning machine is also completed by 50%.In this regard, the learning machine said frankly: "I can't determine your progress, I only look at the results after the exam."

There is still more than a month before the physics midterm exam, Wei Shuxun is not in a hurry.He owes two tasks to the learning machine, one is Professor Zhao's lecture materials, the current task is only 8%, and the other is the midterm exam task. As for the task of "great man", it has been fixed at 16.5%, and it has not been moved for a long time pass.

Sure enough, being a "great man" is not so easy.If it weren't for the progress made in saving people, I'm afraid I'm still forced by the learning machine, instead of doing whatever I want leisurely like now.

Without tutoring to occupy time, Wei Shuxun has more time. Now he is not interested in playing games at all, so he goes to the laboratory to play.The three of them were probably really busy with their studies, and Wei Shuxun didn't meet them when he went there a few times.

Sun Yi had already given him the key, and said that the tools in the laboratory can be used casually, but the blueprints left in the laboratory are very ordinary. Wei Shuxun looked at it, and was not even interested in doing it.

Before he knew it, his eyes had been caught.

Taking advantage of the weekend, Wei Shuxun went to visit Professor Zhao.Professor Zhao's injury has not recovered. After all, he is old. Unlike Wei Shuxun, who has a learning machine to help him, he still hasn't returned to school.However, he moved out of the hospital before the Spring Festival and recuperated at home.

Wei Shuxun carried the fruit into the door, and after some greetings, as a student, he said bluntly to Professor Zhao: "Professor, I have learned the angular spectrum theory of scalar diffraction."

Professor Zhao nodded with a smile: "Is there anything you don't understand?"

"It's okay." Wei Shuxun replied: "I just feel very boring and can't read it. Is there any interesting example for me to play?"

"..." It was probably the first time that Professor Zhao met a student who said he couldn't see it in person, pointing at Wei Shuxun and almost speechless. "You... that's how you study? Reading isn't fun!"

Which of the doctoral students he leads is not diligent and diligent, for fear of not learning enough, well, the most promising student came to tell him that he didn't want to go in.

"Because it's really boring!" Wei Shuxun spread his hands: "I keep talking about the complex amplitude of light vibration, but the content is all about program calculations. I don't know what the optical axis and wave number are. I can't rely on imagination. study?"

It can be seen that Wei Shuxun is indeed studying, Professor Zhao nodded: "We usually have corresponding experiments in class, and we really can't let you do it behind closed doors. In this way, let me show you some sample problems."

Wei Shuxun was overjoyed, and was slapped on the head by Professor Zhao: "Stand up! How can you treat learning as a game, learn when it's fun, and don't watch if it's not fun. Is this how a student should be? Is there a saying that you want to learn or not? If you have the ability to take the exam, you can tell the teacher which questions I don't like, so don't pass the exam..."

After being punished to stand for half an hour, Wei Shuxun got a copy of the blueprint of the square wave generator.Zhao Jiaoxiu sent him out, and taught him a lesson as he walked: "Look at it carefully, and come to me after you understand it. There is also the angular spectrum theory of scalar diffraction. You are not allowed to miss any of those contents, and I will test you! "

"Yes, professor, you don't need to send it away, I will come to see you next time." Wei Shuxun didn't dare to ask Professor Zhao what he wanted him to see, and ran away wiping his sweat.

Seeing Wei Shuxun leaving, Professor Zhao restrained his anger and smiled.His wife supported him and said, "Okay, he is still young, you scolded him so fiercely, be careful he won't dare to come next time. You usually talk about this child every day, but when he comes over, you are another A look."

"You don't understand." Professor Zhao still looked at the direction Wei Shuxun left, the cheerful running figure was no longer there, and he still felt that he had to watch: "This kid is talented. I have taught students for so many years, and I haven't I have seen self-study with only lecture notes. Moreover, the angular spectrum theory of scalar diffraction, which already involves optical radiation, he thought it was not fun and not interested, not that he could not understand it. The doctoral class I took was not there at the beginning. Such an arrogant student."

Professor Zhao turned to his wife: "Tell me, can I not be strict, how can I let him waste his talent like this!"

And Wei Shuxun, who has "talent" and may not pass the midterm exam, is being dragged by his classmates to continue to fall.

"I'm not going, I'm not interested."

"No, you have been away from group activities for too long, no matter what, I will carry you away today!"

As soon as he returned to the dormitory, he was dragged by the three of Wu Feng to join the sorority party. If he was still interested in last semester, he met Li Xiaoran and Chen Ting as soon as this semester came, and he realized that he didn't understand girls' thoughts at all. A little bit of respect for any girl.

But after all, one person couldn't resist the struggle of the three of them, so he was forced to participate in a fellowship, and stayed in the KTV until eleven o'clock in the middle of the night before escaping back to the dormitory while they were singing hard.

When he woke up the next day, he found that Wu Feng and the three of them had come back at some time, and they were lying on the bed and sleeping dimly.Wei Shuxun yawned, washed up and went downstairs, went to the cafeteria to buy three baskets of steamed buns, didn't plan to eat out for lunch, and went straight to the laboratory.

Sun Yi and the others were absent, so Wei Shuxun turned on the computer, inserted the USB flash drive, and opened the folder of the square wave generator.

According to the instructions, the square wave generator was not made until the third year of junior high school, because the required equipment is more professional and can only be made in a special laboratory.A hobby lab like Sun Yi's obviously couldn't.

For example, low-pass filters, 1602 liquid crystal displays, matrix keyboards, etc., are not available in the laboratory.

Wei Shuxun was frustrated, no wonder Professor Zhao only gave him one set of materials, and said that he would continue to give him new ones only after learning how to make them.

Two days later, a senior who was studying for a Ph.D. approached Wei Shuxun.This senior was the one who sent the USB flash drive to Professor Zhao last semester, and he was barely an acquaintance.When he came over last time, he just looked at Wei Shuxun a little more, but today he looked up and down for several minutes.

"Senior, what's the matter?" Wei Shuxun interrupted his scrutiny: "What orders does Professor Zhao have?"

"Follow me." The senior said, "Professor Zhao asked me to take you to the laboratory."

Taking Wei Shuxun to the fifth laboratory building, the senior named Ye Chengtian couldn't help looking back at Wei Shuxun while swiping his card to open the door.

"It's the fifth time, senior." Wei Shuxun said, "I know I'm handsome, so you don't need to see it so many times."

Ye Chengtian shook his head, took Wei Shuxun into a small laboratory, and said with a smile: "It's the first time I bring such a young student in, I wonder if you can understand what I'm going to talk about later. .”

No wonder he was confused, although the square wave generator is not difficult to make, but if the level is not enough, it is impossible to understand it even if it is made in person.Otherwise, the case of the square wave generator would not be put in the second semester of the junior year.Of course, the principle of the square wave generator is actually not complicated, but most people can fully understand it, and it must be in the third year, because it includes other electronic principles, so if you don’t learn it, you can’t understand it.

Although Wei Shuxun is also an electronics major, everyone knows that the first-year courses are all sub-courses, which have nothing to do with majors.And he just handed Professor Zhao's lecture materials to Wei Shuxun last semester, so he can understand it so quickly?

"Look, I will only make it once. If you don't understand anything, you can ask me, but don't ask questions about circuit parameters, or I will throw you out."

"No problem." Wei Shuxun nodded.

He is not confident. He has carefully studied the information on the square wave generator, but he can't understand at least half of the principles. He probably hasn't learned it yet.But he still knows how to draw inferences from one instance, not to mention that he has a learning machine on him.

"Learning machine, record, analyze."

This is the function of the learning machine discovered by Wei Shuxun when Liu Yongdong helped him make transistors when he first met Sun Yi.That is, as long as he asks, the learning machine can actually provide a certain amount of learning help, but because his courses have always been boring English, mathematics, etc., he can't use it.At least he didn't want to listen to the instruction of the learning machine at all in terms of boring sub-classes, maybe he would do exercises until he died.

"First of all, I will give you 10 minutes to memorize the first design diagram." Ye Chengtian opened the slideshow and asked Wei Shuxun to look at the first circuit diagram. "You should understand the principle of hysteresis, right? This picture is an output bipolar voltage. Remember its circuit diagram. I don't have time to show you slowly when making it."

If Wei Shuxun has any advantages, it probably has a good memory, especially for things he is interested in.He had memorized the circuit diagram a long time ago, but he still read it carefully and nodded: "I remember."

"Then start."

There are a lot of information on square wave generators. There are more than a dozen circuit diagrams alone, and each diagram is accompanied by two to three principle explanations.But in fact, it is not complicated to do it. For the electronic principles that have been understood, it can be automatically classified into one or two sentences in the mind.For things that you don't understand, seeing Ye Chengtian's production and his explanation, it's hard to understand.

Moreover, Wei Shuxun also has a learning machine in his mind that is responsible for explaining and analyzing carefully.

"This step uses the multivibrator principle UC=+UZ calculation formula to make it compatible with TTL level." When Ye Chengtian was making it, the learning machine scanned and recorded, and explained simultaneously: "So the Uo duty cycle 1/2 of the rectangular wave, the cycle-tuned wave type is 3T."

It was made while explaining in this way, because it was a very simple thing for Ye Chengtian, and it took less than an hour to complete it.After finishing, he asked Wei Shuxun: "Do you understand?"

"Yes, I understand." Wei Shuxun nodded, "Thank you."

"You really understand, just ask if you don't understand, don't lie, I won't scold you." It's no wonder Ye Chengtian questioned, when they were in their junior year, the whole class didn't understand the production for the first time, Wei Shuxun is only a freshman and can understand?

"Well, basically." Wei Shuxun still nodded: "It's the period-tuned wave type, and the calculation principles of the duty cycle-tuned wave type are not very clear. I think it is in Professor Zhao's information. Look, you can't let me teach me here."

"...Is this the only thing you don't understand?"

Wei Shuxun tilted his head and thought about it seriously: "Well, these are these at present, and I haven't remembered the others. You see, if I go back and find something I don't understand, I'll call you and ask you, is that okay? "

Ye Chengtian was silent for a long time, then shook his head: "I finally understand why Professor Zhao is so impatient..."