Li Guocheng lowered his head and held a book, in the eyes of others, he was bowing his head to study, but in fact, he remembered in his mind the past of recent research on ADC chips.

The working principle of the ADC is to turn the analog continuous input signal into a discrete digital signal, which is convenient for the computer to analyze the characteristics of the analog signal.

To design an ADC, you need a DAC (digital-to-analog converter), and to design a DAC, you need an op amp.

This is Li Guocheng in the past six months to recall the university knowledge of the combing, op amp is also called operational amplifier, through the search for information, as early as 1941 Bell Labs with electron tube designed and patented.

After Li Guocheng got the circuit diagram, he was ready to redesign it with transistors.

Just as I was about to design the op amp, I felt a sudden silence in the classroom, and then I heard a cough. Li Guocheng retracted his thoughts and looked up at the podium.

Where a very familiar person was standing, looking around at the classmates seated, and when everyone's attention was focused on him, he spoke:

"Comrades, good evening, I am your homeroom teacher Wang Peiyi. As you all know, the goal of our technical exchange class is not to be repeated here.

You are all outstanding young people in various units, and I hope that in the technical exchanges in the next year, you can be improved and better work for the rise of China."

Everyone consciously applauded warmly, this has become everyone's instinct, no need to be reminded, everyone knows to applaud at that moment, cheer at that node.

"Before the class starts, we introduce ourselves and elect your class president. Then start with the first one on the left in the first row."

"My name is Tang Danian, and I am a level 11 technician in the precision laboratory of the rolling mill, and I am very happy to meet you", after speaking, he turned around and smiled and nodded to Li Guocheng in the back row.

It turned out that the last place was given to him, and he was also quite interesting, and it was estimated that he saw Zhou Xiaojuan sign up, so he also signed up.

"My name is..."

"My name is..."

"My name is Wen Juan, and I am a Level 16 intern at Capital No. 1 Machine Tool Factory, and I am very happy to meet you. I was the class president when I was in middle school, so I volunteered to run for class president."

A very beautiful, curvy, tall 25-year-old girl introduced herself in an atmospheric manner, and her tone was clean and neat.

My name is... ”

"My name is Li Guocheng, a rolling mill laboratory, a level 5 fitter, it's a pleasure to meet everyone", Li Guocheng stood up and briefly introduced himself.

When Wang Peiyi saw Li Guocheng, he didn't seem to have any special expression, but Li Guocheng obviously felt that his smile became much more sincere, and he nodded to Li Guocheng imperceptibly.

After everyone introduced themselves, Wang Peiyi coughed again, "Comrades who are willing to serve everyone can sign up for the squad president election."

As soon as the words fell, two people raised their hands, and one of them, a young man surnamed Wang, who was slightly chubby, saw the other person who raised his hand, and slowly put it down unwillingly.

The other has a slender figure, a slightly feminine face, slightly thin lips, and a calm expression.

After waiting for a few minutes, Wang Peiyi saw that no one else raised his hand again, so he deliberately glanced at Li Guocheng a few times, and saw that he did not react, so he said: "It is Wen Juan and Ouyang Jianguo who participated in the squad leader election, and they each have 3 minutes to introduce themselves, and then everyone votes, and the one with more votes wins."

Li Guocheng had a chill, and Ouyang Jianguo always had a sense of déjà vu of coffee with garlic.

"Then I'll come first," Ouyang Jianguo said.

"Although I am a level 13 technician in the precision instrument factory, my father is the *** director", very briefly, and looked around proudly after speaking.

"I am an ordinary technician, but I have a heart to serve everyone, have many years of experience in class management, and can assist teachers to complete teaching tasks" Wen Juan sat down after speaking, and the proportion was just right.

Li Guocheng has no interest in these scrambles, but he does not despise them either, everyone has come from this 2B age.

After some voting, Wen Juan won by a margin of votes and became the squad leader. Comrade Jianguo looked angry.

"Wen Juan is the squad leader, Ouyang Jianguo should be a member of the study committee", Wang Peiyi came out and diluted the mud.

"I will talk about the future study arrangement, every Tuesday and Thursday night at 6:30 p.m. and 8:30 p.m. Learning contentThis course includes 5 courses: Marxist Philosophy, Gross Selection, Engineering Mechanics, Fundamentals of Mechanical Design and Metal Technology.

The technical exchanges with you are all authoritative engineers who have been engaged in technical research or manufacturing for many years, and I hope that you will communicate seriously in the future. Students are invited to study the knowledge of the four years of secondary school on their own, and the exams will involve mathematics, physics and chemistry in secondary school."

Since then, Li Guocheng and his family have participated in technical exchange classes organized by the Ministry of Mechanical and Electrical Engineering every Tuesday and Thursday. During this period, the squad leader organized several activities, mainly to visit and study in several large factories.

Of course, there were also a few bullshit incidents in the middle, and under Li Guocheng's personal practice, the performance of the five people in the rolling mill was that it was none of their business and hung high. Very quiet, not prominent, not backward, pretending to be transparent.

The knowledge taught in the classroom is very basic for Li Guocheng, and he has studied it many times and has integrated it. If it weren't for the certificate, he wouldn't have come a long time ago.

So every time, Li Guocheng looked up at the blackboard, thinking about chip design.

At the beginning of April 1969, Li Guocheng got the test report of the NOR FLASH FC1M100 chip, and the results once again proved the power of telekinetic simulation.

Then call Xiao Bing.

In Li Huaide's office, this time there were only Li Huaide, Li Guocheng and Xiao Bing, and Wu Liankui began to walk again.

"Comrade Xiao Bing, this is a memory chip with a capacity of 1MB. Parameters can be written in advance using the Type 103 computer, and the CPU reads the pre-stored information to control the missile."

Xiao Bing looked down at a small chip in his hand, his eyes were incredible.

"Do you say that the capacity of this chip is 1MB, is it a big B or a small B?" , Xiao Bing asked with a short breath.

"Big B".

"It's enough, in fact, the control data is currently only 100KB, since this chip has reached 1MB, then you can think about adding some information", Xiao Bing's eyes were full of joy.

"And what interfaces do you need?" Li Guocheng asked.

Xiao Bing thought about it, 10 digital outputs, two of which need a drive capacity of 100mA, and the other 8 need 10mA.

Li Guocheng thought about it, there is no problem, and the total power consumption is not expected to exceed 3W.

Xiao Bing was shocked again. He already felt that the rolling mill was powerful enough, and this cooperation only discovered the perversion of the rolling mill laboratory.

It only took a little more than a month to give a perfect solution, and the result was far beyond expectations. He has already made up his mind that he will cooperate well with the rolling mill and Li Guocheng in the future.

"I don't know what the final price is?" Xiao Bing asked.

"This is yours looking for us, Director Li," he said, pointing at Li Huaide.

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(End of chapter)