Duan Yun worked at Shekou Law Firm for two or three hours, and talked with lawyer Yao Feng about many things, including debt lawsuits and various contracts that Duan Yun would draw up in the future.

In the end, Yao Feng personally sent Duan Yun out of the law firm, and agreed that he would personally go to the electronics factory tomorrow to sign an employment contract with Duan Yun.

Duan Yun's hiring of legal counsel in Shenzhen's private enterprises is definitely ahead of its time, but in fact, Duan Yun is well aware of the importance of legal counsel for an enterprise, and as Duan Yun signs more and more contracts in Shenzhen in the later period, he must have an expert in the legal field to assist him, and the most important thing is that lawyers can help themselves solve economic disputes, having a lawyer and not having a lawyer are completely different, although there are many people in China at present, it seems that lawyers are not of much use.

After leaving Shekou Law Firm, Duan Yun went home directly by car.

Come to your own study, turn on the computer, Duan Yun operation is CAD software, designer circuit board to come.

The successful development of the plug-in machine and the new tape recorder micro motor finally gave Duan Yun the possibility of being able to mass-produce the domestic Walkman, but considering that the domestic integrated chip industry is very backward, he can only make the circuit board part of the Walkman by stacking electronic components.

If it is completely designed according to the current Sony Walkman function of the latest product, then the number of electronic components required will be terrifying, including motor control, sound quality adjustment, radio, recording and other functions, and the preliminary design will require more than 140 electronic components.

Installing more than 140 electronic components on a palm-sized circuit board is simply a disaster, only the circuit board of an ordinary tape recorder can put so many electronic parts, so the integration of electronic components is the real technical bottleneck of the Walkman tape recorder, and if the circuit part is not integrated, it is impossible to make the most advanced Walkman products.

In desperation, Duan Yun could only retreat and design the Walkman as a simple version with the playback and rewind function, so that a lot of electronic components could be reduced.

But even so, the circuit board of the Walkman with only the motor speed regulation and the function of playing the tape is still very compact, but there is a plug-in machine and a high-performance micro motor, which also makes it feasible for Duan Yun to produce a domestic Walkman.

However, Duan Yun still wants to achieve more functions on the recorder, the simplified version does not mean that it is a low-quality defective product, reducing other functions, Duan Yun has to find ways to make some enhancements in the sound quality of the Walkman, but this has to add a lot of electronic components.

Duan Yun was repeatedly entangled in this design of adding and subtracting electronic components, designing more than 10 circuit board drawings before and after, but each one was not very satisfactory to him, and sometimes he had to tear down and restart when it was half of it.

As for the shell of the Walkman, the Japanese Walkman uses an aluminum alloy shell, and the metal feeling is very good, and if Duan Yun also uses a metal shell, then the cost of the product will increase, which is not conducive to his price war.

In fact, according to Duan Yun's original idea, he wanted to make a machine that most people could afford, and the price must be low, so using a plastic shell is undoubtedly the wisest choice.

But Duan Yun had other considerations.

After all, what he wants to do is the first domestic walkman, this matter is bound to attract great attention in China, and the domestic media will definitely report on this matter, and if the domestic walkman produced by Duan Yun has a rough appearance and the product quality is not up to par, it will definitely be infinitely amplified by some media with ulterior motives, resulting in a collapse in word-of-mouth.

Therefore, since Duan Yun wants to sit on the first domestic Walkman, he must have a bright spot that can be handled, and the quality must be excellent, so it seems that the use of a metal shell can at least make the product look more high-grade.

The use of metal shells will definitely increase the cost, but fortunately, at present, Duan Yun has his own mechanical processing factory, and he only needs to spend money to buy a stamping machine, and he can produce metal shells in large quantities, and the cost will not be much higher, which should be completely acceptable.

In addition, Duan Yun's high-quality and beautiful PCB circuit board made by the plug-in machine, as well as the domestic first-class tape recorder micro motor, are enough to be used as a technical highlight and taken out for publicity.

"I came back early today. At this time, the door was pushed open, and Cheng Qingyan asked with some surprise after seeing that her husband was busy in front of the computer.

Some time ago, Yun worked overtime in the factory every day, and sometimes he didn't come back at night, and today it was rare to see Duan Yun return home in one day, so Cheng Qingyan felt a little surprised.

"I'll cook for you. Duan Yun turned his head and glanced at his wife with a smile and stood up.

Duan Yun still feels a little sorry for his wife, especially in the recent period, Cheng Qingyan has really spent a lot of thought in order to manage the factory and plan the affairs of the Chamber of Commerce, and she is under a lot of pressure, and the whole person is a little thinner than before she got married.

So usually, as long as Duan Yun has the opportunity, he will cook by himself.

"No need, I still have some leftover food yesterday, I'll heat one, and we can make do with it." Cheng Qingyan said lightly, then turned her gaze to the computer on the desk, and asked, "What circuit are you designing?"

"This is the Walkman circuit I designed, and this Walkman will become the main product of our factory in the future. Duan Yun said.

"Walkman!?" Cheng Qingyan was stunned for a moment when she heard this, and asked in surprise: "The technology of the Walkman is too complicated, can our factory produce this kind of product?"

"If you want to produce and import Walkman products with similar specifications, the chip level in our country is very low, and we can't do that kind of highly integrated circuit board, so I changed my thinking and designed a simple version of the Walkman, of course, the cost price will be much lower, if it can be mass-produced, it should become a best-selling product." Duan Yun said with a smile.

"Greedy and chewy, our new tape recorder is still in the test marketing stage, and I haven't got a large order, and now you have started to develop Walkman products, and the pace is a little too fast." Cheng Qingyan shook her head lightly when she heard this, and said to her husband.

"Our domestic product upgrading speed is very slow, some factories can sell a product for several years, but in foreign countries can basically upgrade 1~2 generations of products in a year, tape recorders, walkmans, this kind of electronic products are fast-moving consumer goods, our goal is to sell a generation, research and development generation, look forward to a generation, research and development work must always be in front of production, only such a rhythm, in order to avoid being eliminated by the market. Duan Yun raised his eyebrows and said.