After the incident of Professor Lu's forced entry into the laboratory and the dinner in the faculty cafeteria, Zhou Minde entered a more active state of work in the laboratory.

The first thing Zhou Minde did when he returned to the laboratory was to dismantle the CD player and video recorder, take out the circuit board inside and compare it with various LD machine chips that were no longer in shape at all, and then continue to fly the cables to adjust the circuit logic.

Zhou Minde, who could save money before, would definitely not do this, but now Zhou Minde can't take care of so much, and only by doing more comparisons can he better grasp the circuit logic of this audio-visual signal chip.

Of course, this is not that Zhou Minde thinks that he has Zheng Nan's promise and spends money boldly, but that the funds from Professor Lu's Institute of Mechanical and Electrical Engineering have come over.

In the previous disposition made by Luo Kaiding, deputy director of the department, there was the deprivation of part of the research funds of the Institute of Mechanical and Electrical Engineering to the semiconductor laboratory, and Zhou Minde also let go of the spending after getting this part of the funds.

And this money is also well spent, Zhou Minde dismantled more than a dozen different models of machines, compared the chips of these machines, and really touched a little circuit logic, Zhou Minde continued to fly crazy on the LD chip, and soon got the desired signal pulse in the test.

On the day of the successful test, Zhou Minde and Xiao He Li Xing hugged each other and shouted excitedly.

However, the success of the chip test does not mean that it is finished, on the contrary, there are more tedious and boring challenges ahead.

Very simply, the chip outputs only a current pulse signal, which the TV cannot read, and a special decoder is needed to convert the pulse signal into a video and sound signal that the TV can read.

In addition, while the chip outputs the pulse signal, due to the effect of current and voltage, it is easy to produce current noise and output together, which requires adding a limiter to fix the current pulse in a certain range, so as to eliminate the influence of noise on the signal.

This is easy to say, but quite torturous to do, and it requires a lot of repeated experiments, including sampling and quantification, to simulate the signal situation in various situations, and finally come up with the most suitable result.

So Zhou Minde and Li Xingxiaohe, as well as several technicians from the electronics factory, began to use the laboratory as a factory workshop, working day and night to manually rub chips.

Hand rubbed chips?

Zheng Nanchu was dumbfounded when he heard the news, he never thought that this thing could be rubbed by hand, so what else does he need a lithography machine?

Later, I learned that because the chip accuracy required by VCD is not high, the skilled workers in the factory workshop can take the copper wire and weld it out little by little according to the drawings, but if it is below the millimeter level, they can only turn to professional precision instruments.

In the end, Zhou Minde and Li Xing worked out more than 100 chips and decoder limiters in the laboratory day and night for three days, and then there was a boring and long power-on test session.

Li Xing told Zheng Nan that this link is a test of luck and experience, sometimes it can be done in a day, and if you are really unlucky, sometimes you may not be able to do it in a week.

Standing in the laboratory, Zheng Nan looked at the neat row of chips and flashing red instruments on the shelves in front of him, and could only say that it was the romance of the laboratory.

Of course, in addition to the testing link in the semiconductor laboratory, Zheng Nan did not forget Director Cao and Professor Lu.

Although they are not commercial espionage, the research work on the VCD project is still kept secret if it can be kept secret.

Thanks to Zheng Nan's reservation of the right to report to the official at any time, Director Cao and Professor Lu both did a good job of confidentiality, and Zheng Nan knew one thing, that is, when Professor Lu was chatting with the power plant leader, the power plant leader inadvertently mentioned the semiconductor laboratory, and Professor Lu immediately jumped up like a cat whose tail had been stepped on, and shook his head and said that he didn't know anything.

Zheng Nan could only hold his forehead helplessly and shake his head, isn't this guy here without three hundred taels of silver?

But this can also show how much psychological shadow this matter has caused him, so it's okay, as long as he doesn't leak the news, Zheng Nan won't bother to care about other things, and let him be curious if someone is curious.

Similarly, Zheng Nan also talked to Pete Wang and several classmates that day, all of them were carrot and stick strategies, on the one hand, warning them not to say half a word about VCD research and semiconductor laboratories outside, otherwise they would be sent to prison; On the other hand, he promised them that if he did a good job, he could contribute a sum of money to them as a scholarship.

The effect is also outstanding, these are the talents who can be admitted to the university in these years, they understand what Zheng Nan means, and they are all tight-lipped and do a good job.

The situation in the laboratory was not so smooth, it may be that Zhou Minde and Li Xing used their good luck to meet Zheng Nan, who was reborn, so that their testing work took a full week to finally determine a few intervals, and finally they only needed to do further testing on these intervals before they could choose one of them for final use.

"So Director Li, you have collected tens of thousands of pieces of data, and finally choose one to use?" Zheng Nan asked in surprise.

Li Xing nodded and said: "This is a good situation for the factory director, it is normal to do tens of millions of times for this kind of chip test, and finally choose the one with the best stability." ”

Zheng Nan was stunned when he heard this, Zheng Nan had never thought that the research and development of chips would be such a way before.

Although I also understand that scientific research is to find out the wrong way, and the rest is the right way, when I see it with my own eyes, I can't help but sigh and sigh.

You must know that this is still 90 years, or VCD, a chip that can be rubbed by hand, if this is the kind of nano-level super chip in later generations, Zheng Nanguang feels numb when he thinks about it, and it is no wonder that there are so many semiconductor manufacturers in later generations, and only one is catching up with the international advanced level in designing chips.

After a moment of silence, Zheng Nan reminded Li Xing: "The chip has design redundancy, although various tests can ensure stability, no one can be 100% sure." ”

Zheng Nan was also a victim of various inferior goods in his previous life, and if he wants to be a brand, he needs to put quality first.

Li Xing reassured Zheng Nan, saying that they also considered this, not only in terms of functional redundancy, but also reserved a spare compensation circuit to use when the main circuit was not working.

Zheng Nan was relieved, and Li Xing told Zheng Nan that it was time to find a foundry.

"Factory director, although this kind of skilled workers in the chip workshop can also be manufactured, I still recommend using professional precision instruments for manufacturing, and the factory only does the final assembly, which can greatly improve production efficiency."

Li Xing suggested that Zheng Nan contact Chen Zhouyi to discuss, because at present, the best precision equipment in Jiangxia is the radio factory.

Zheng Nan nodded and understood: "Leave this matter to me, Director Li, your current task is to get me a full set of finished products as soon as possible!" ”