Siheyuan: Starting from a fitter

Chapter 164 Control motherboard design completed
"Gong Xiao, we are in a bit of a hurry today. Once the plan is finalized, we will send you the quotation in advance."

Li Huaide was also depressed, "How do I know the cost, and the selling price is even more impossible to talk about."

"Xiao Gong, do you have any requirements for the shape of the circuit board?"

"The smaller the better, try to limit the maximum to 10x10 cm," Xiao Gong said expectantly.

"There is no problem. We will design according to 5x5 centimeters first, and we will modify it if there are any problems later," Li Guocheng said firmly.

"That's great. You can put it on the side wall of the gyroscope. This saves the control chamber and allows you to carry more fuel," said Engineer Xiao happily.

"Is your gyroscope big?" In Li Guocheng's impression, the gyroscope was only the size of an egg.In later generations, children played with fidget spinners all over the streets.

"It's not that big! It's only about the size of a basketball, much smaller than Big Brother's. This is our second-generation product," Xiao Gong said proudly.

Li Guocheng had the urge to support his forehead.Such a big gyroscope, just this is proud of it!
Forget it, I just understand the principle of a gyroscope, but how to make it, I don't have the ability yet.If mechanical finishing is performed on the basis of the current gyroscope, the size should be reduced.

"Gong Xiao, you also know that the full name of our laboratory is Precision Laboratory, and the technology we started with can be used for precision machining. If you trust our laboratory, you can consider letting us miniaturize the gyroscope design."

Xiao Gong thought for more than ten seconds, "Now we are in-depth cooperation, I will go back and apply first, and we will talk about how to cooperate after the results are obtained."

"Okay, Mr. Xiao. Back to the topic, how many samples do you need to navigate the control panel?"

"Five yuan is enough," Xiao Gong said excitedly.

"Then it's settled, you can get the sample within three months at most," Li Guocheng said firmly.

"Great, we are getting familiar with the operating system and programming language of the Sugon 103 computer. Everyone likes it very much. The transistor computer we introduced from West Germany last year still used paper tape input. Now that we have the 103 model, everyone no longer needs that computer. .

The Pangu programming language is even more powerful. It is not only a Chinese language, but also has very friendly writing habits and interface.We no longer have to compete with machine language."

"As long as everyone likes it, if you have any needs, just ask. We will continue to optimize and make progress based on everyone's requirements," Li Guocheng said modestly.

The same feeling happened in the office of the big leader.

"Old Zhao, this report is a bit extravagant. You actually went to a newspaper to print it. I have to see if the content inside matches the paper."

A vigorous old man habitually bent his right arm in front of his chest, holding a manuscript in his left hand and patting it on the table in front of him.The old man on the other side smiled and said nothing.

After reading the first page, the big leader raised his head and looked at Mr. Zhao, "No, this is not your writing style, Mr. Zhao. Your previous manuscripts always came to a conclusion at the end, with all the foreshadowing at the beginning.

In this manuscript, the conclusion of the full text is written on the first page, followed by a discussion of the conclusion, with very clear levels.Tell me, who is the master who wrote this manuscript for you?"

"I'll tell you after you finish reading the conclusion," Mr. Zhao smiled even more happily.

When the leader read the conclusion, he did not stop, but continued reading. It was divided into several subsections. The beginning of each subsection was the conclusion, followed by the supporting data and information for the conclusion.

After reading it in one breath, the big leader closed his eyes and meditated.

"Dawn 103 computer and Pangu programming language are really so advanced?"

"After about half a year of use, each unit has different applications, especially in automatic control, some experts predict that there will be great development.

In the past, we suffered from the huge size and high power consumption of computers. Although there was automatic control theory, it was difficult to apply it in practice.Now with the 103 computer, many projects are possible.

Before I came here, I received a report from the National Research Institute that they are cooperating with the steel rolling mill laboratory to develop a microcomputer that can be used in missiles," Mr. Zhao said proudly.

"Okay, the leaders are also paying more attention to missile research and development. I heard that they have been stuck in the navigation area in the past. If we can break through, many problems will be easily solved. By then we will also have a fist that can really threaten the enemy.

No matter how good the knife is, it is only valuable if it is pierced into the enemy's chest.

You have a great grandson-in-law!I hope you can cultivate this seed well and bear more fruits on his big tree."

"Don't worry, we will! By the way, this printer is also a good thing", Mr. Zhao hurriedly sold it.

"It's a good thing, but what we lack most now is foreign exchange and powerful weapons. Without foreign exchange, we can't introduce equipment, and without powerful weapons, we can't protect our wealth and land."

"Now the rolling mill is researching CNC machine tools. With the addition of world-leading computers, we can also exchange technologies or products with the West in the future."

"Okay, we Chinese are the smartest, the most able to endure hardships, and the most tolerant. In the 20 years since the founding of the People's Republic of China, we have built a basic industrial system on the ruins. Now we have the most advanced semiconductor technology, and there are successors!"

"Yeah, I seem to have felt the glory and splendor of Huaxia's future."

The two elders looked sacred and remained silent for a long time.

Two months later, Li Guocheng completed the design of the op amp and was engraving the mask board.

"Brother Li, do you think it can work this time?"

Yan Jiefang carefully walked up to Li Guocheng with a circuit board. This was already his third version of the missile control board design. Li Guocheng was not satisfied with it the previous few times. Each time, he either said that the area was too large or that the signal was complete. Sexual layout is not good.

But he could understand the large area, but he couldn't understand the signal integrity. Finally, he finally figured out that the connection must be short, and multi-layer boards must be considered.

This was the first time he had successfully produced a 4-layer board. He asked Zhou Xiaojuan to do the drilling and tin plating. She helped prepare a tin plating solution and finally solved his problem.

When he showed it to Li Guocheng, when Li Guocheng looked at the light, he sat up in shock.

"Unexpectedly, Jiefang, you really made a multi-layer board, how did you tin-plate the vias?" Li Guocheng was very happy, but he didn't expect that Jiefang gave him a surprise when he was about to do it himself.

"The potion prepared by Zhou Xiaojuan", Yan Jiefang saw that Li Guocheng was happy and knew that this version should be a success.

"You are all good! Have you tested the impedance?" Li Guocheng asked.

The impedance meter was disassembled by Li Guocheng, an old impedance machine in West Germany, and then imitated, optimized and re-made. The accuracy far exceeds that of the West German one.

"After testing, the via impedance did not exceed 0.1 ohm. In order to reduce the area, a double-sided device layout was adopted, and the NOR FLASH was attached to the back."

"This is the best and most advanced design currently," Li Guocheng was very sure.

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(End of this chapter)