Li Guocheng saw a note left by Zhao Ting at the dinner table, with a few words written on it: There is rice in the pot.

Li Guocheng smiled, went to the kitchen and opened the lid of the pot, which was his favorite stewed vegetables and white flour steamed buns. I picked a bite of the dish and tried the temperature, but it was already cold.

After relighting the stove and heating up the meal, I happily finished the meal that I didn't know if it was breakfast or dinner.

I wanted to boil water to take a hot bath, but I thought about it, I haven't washed it well for several days, so I just woke up and took a bath in the bathhouse, rubbed my back, and felt so comfortable.

I took off my coat and pants, put on a sweater and wool pants and fell on the bed, and soon fell asleep.

I woke up at noon, went to a joint canteen not far from the street, ordered a boiled pork slices, two Erhe noodles steamed buns, and dealt with a simple bite, did not dare to eat too much, and avoided performing the fountain in the bath.

Go home and get the bedding, change clothes and toiletries, and throw them into the secret place first. When you get to the bathhouse, take out a change of underwear and toiletries when no one is looking. Pay and park your bike.

Because he came early enough, there were not many people inside, Li Guocheng finished showering, soaked directly in the hottest pool, looked at the few uncles next to him, made eye contact with each other, and approached and whispered: "Where did the second goods come from, not in the low-temperature zone transition, directly to the high-temperature pool, don't want the balls."

With Li Guocheng's hearing, all of them are in his ears, and he is not allowed.

After more than two years of cultivation, the quantitative changes have produced qualitative changes, and the skin has become a little itchy after the end of this year, and the skin will occasionally feel tingling when practicing. This is very similar to the characteristics of skin refining.

Li Guocheng now insists on practicing every day is just a habit, because he can't feel progress, so he puts most of his energy into the rolling mill. Even if he found out that there were signs of skin refining, he didn't pay too much attention to it, and there was always a voice in his heart to remind him that no matter how powerful he was, he couldn't stop the bullet.

I didn't deliberately pursue anything, I just moved the internal breath every day according to the line of practice, and the internal breath did not increase much, but I slowly found that the internal breath became more condensed and more controllable.

Of course, the benefits are also very obvious, the physical strength is strong enough, not easy to fatigue, the body recovers quickly, the hands are steady, the eyes are clear, and the concentration is concentrated. Mental power seems to be related to spiritual variation, but it is unreasonable to say that it has nothing to do with the exercises, and the better the body, the more lasting the mental power.

Yesterday, he carved the transistor by hand, and he felt at ease, and his subtle telekinesis allowed him to control it easily.

Li Guocheng was thinking about the exercises, while enjoying the soaking in the hot water, if it wasn't for the environment, he would have wanted to lie in the pool and hum a few times.

After feeling soaked through, find a bath master and operate it, and feel refreshed.

After changing his clothes, he cycled back to the laboratory, where he had to eat and live in the last few days.

Li Guocheng has been working the night shift these days, and everyone is used to it. I usually can't see him during the day, but today I found out that he arrived early.

Everyone else has arranged their work, and Yan Jiefang has nothing to do, and he is panicked in his heart. Every day, I try to get close to everyone and help out. Wu Liankui didn't know what Li Guocheng thought, so he didn't arrange a job.

Yan Jiefang was about to wait for Li Guocheng after work today, but he didn't expect to see him before getting off work, and he wanted to go up and ask about the next work arrangements, but he didn't expect that someone was more anxious than him.

"Brother Li, you help me, you can't leave it to me", Zhou Xiaojuan ran over and said in a hurry.

"What's the matter, don't worry, take a breath and talk about it", Li Guocheng saw the other party's sharply undulating chest, and hurriedly looked away.

"The substrate is found, and everyone basically uses epoxy resin boards, which are copper or aluminum melted and covered on the surface of the substrate to form circuits. I can't think of how to photocopy the circuit you're talking about, let alone chemically etched it", the little girl looked frustrated.

"Didn't I write it in my notes?" , Li Guocheng was a little puzzled.

"What you wrote above are all masks, photosensitive adhesives, development, etching and other processes, I can see it, but I can't think of how to connect it with the circuit board", looking at the aggrieved little girl, Li Guocheng almost couldn't help laughing.

After listening to the little girl's narration, it was obvious that Li Guocheng took the wrong note, and it was only a note that opened the beginning.

"Really? I'll tell you about it", Li Guocheng didn't dare to say that he took the wrong notebook, and he didn't dare to take out the correct notebook again, otherwise the little girl would go crazy, and he would be afraid.

"Xie Cheng, you come too", Li Guocheng looked at Yan Xie Cheng who was hesitant and called over together.

"I want to hear it too", suddenly Zhang Zhijing also ran in, and saw that she was eavesdropping just now.

Without waiting for Li Guocheng to agree, she stood next to her with Zhou Xiaojuan's arm, obviously the relationship between the two was already familiar.

Yan Jiecheng honestly stood on the other side of Li Guocheng, obviously not daring to get too close to the second daughter.

Li Guocheng didn't bother to deal with them.

Walk up to the drawing desk, spread out a blank piece of paper, pick up a pencil, and explain as you draw.

"The circuit board is made in the following steps, everyone remembers:

First, make a thin enough copper sheet, the size of an epoxy resin board, and glue them together, which is the substrate;

Second, apply the photosensitive adhesive to the copper skin, the thinner the better;

Third, prepare a mask plate engraved with a circuit;

Fourth, use ultraviolet light to irradiate the photosensitive gel through the mask plate for a few minutes, and the irradiated place will become hard, not afraid of corrosion, and the rest will be washed off. In this way, traces of the circuit diagram are formed on the copper skin.

Fifth, soak the resin board in the etching solution, and corrode the copper that is not covered with the photosensitive agent, leaving the desired circuit;

Sixth, perforation, tinning;

Seventh, the single-sided panel was successfully made."

Although Li Guocheng's painting is not on the spot, he can still understand it.

"What is a mask? How are UV rays produced? What is Photosensitive Gel? What is Etching Solution? Zhou Xiaojuan asked 4 questions in a row.

"How do I know, you need to figure out these things and make them," Li Guocheng said scoundrelly.

The three of them looked at each other, looking at Zhou Xiaojuan, who was about to blow up again, Li Guocheng hurriedly waved his hand to stop it.

"I'm in charge of the mask, Yan Jiefang, the ultraviolet light source, the photosensitive glue and etching solution, you two women will do it, okay?"

Although Yan Jiefang was confused, he didn't dare to object, and nodded silently.

"I don't agree," the children objected in unison.

Looking at them, Li Guocheng meditated in his heart, how long has it been, Zhang Zhijing was taken by Zhou Xiaojuan.

"Don't worry, tell me the reason", Li Guocheng asked deliberately and seriously.

Zhang Zhijing's eyes dodged and she didn't dare to speak. Zhou Xiaojuan is very familiar with Li Guocheng and is not afraid at all.

"Photoresist, etching solution, do you think we can figure it out, what they are, I can't find out at all."

"Hell if you can find it!" , Li Guocheng secretly thought.

"Photoresist, the basic material is resin, and the photosensitive material you can refer to the composition of the camera film. The etching solution is either acid or alkali, you can experiment more and learn more", Li Guocheng began to talk about it.

Li Guocheng believes that there is a blank in this regard in China at present, and the West is also in its infancy, so there is no way to refer to it, so it can only rely on itself.

"Zhang Zhijing, how is the collection of chemistry books?" , Li Guocheng suddenly remembered the task assigned to her.

"I bought a total of 18 books, borrowed 5 from the library, and I am studying", Zhang Zhijing is obviously lacking in confidence.

"You leave what you want to see, give me the rest first", Li Guocheng was also helpless, so he could only become an all-rounder.

Zhang Zhijing nodded.

Looking at the few people who were obviously unwilling, Li Guocheng hurriedly announced that he would get off work, otherwise there would be a risk of revealing his stuffing. Now Li Guocheng is stronger than them in terms of vision, and his cognition of specific materials is the same as them.

Zhou Xiaojuan, who was about to leave, suddenly turned around and startled Li Guocheng.

"Where are the voltmeters, resistors and capacitors that can be bought, and enameled wires of various wire sizes," Zhou Xiaojuan said and pointed to the workbench next to her.

"I only borrowed the voltmeter for three days, and I only have this one in the technical department."

After Zhang Zhijing finished speaking, she deliberately rubbed her arm.

Li Guocheng looked at the voltmeter the size of a suitcase, and was speechless, and made up his mind that he must design a multimeter first, otherwise it would be too inconvenient to do experiments.

Thank you all for your support! Ask for recommendations! Ask for a commuter pass!

(End of chapter)