"Hehe, of course I know! Isn't it just that the parameters of the components drift when heated? Zhou Jianhua chuckled softly:

"I have a solution to this problem, you just need to show me the circuit diagram of that machine. Of course, Zhang Gong has been debugging for several days, and should be familiar with this machine, if Zhang Gong can tell me where the signal drift is, I don't have to test it one by one, so that I can give you a solution immediately. ”

After listening to Zhou Jianhua's words, Zhang Gong and Director Lei glanced at each other.

Zhang Gong didn't speak, thinking to himself that such a young man, how could he have such great ability, nine times out of ten he was bragging. But Zhang Gong is not good at objecting, after all, he failed to solve this problem, at this time others say that there is a way, if he opposes it, and does not even give others the opportunity to try, it seems that he is too domineering, but loses his identity.

Seeing that Zhang Gong was noncommittal, Director Lei thought about it and said, "Why don't you just give it a try, anyway, there is Zhang Gong here to take the pulse, so it won't break the machine......

Hearing Director Lei's words, Zhang Gong said to the ponytail girl: "Xiao Wang, you go and bring the circuit diagram." ”

The ponytail girl quickly took out the circuit diagram from the inside, unfolded it and spread it on the counter, Zhou Jianhua just glanced at it, and knew that this was a military walkie-talkie, an old-fashioned analog circuit communication system.

"It's an antique!" Zhou Jianhua couldn't help muttering.

"What?" Director Lei didn't understand.

"Nothing—Zhang Gong, where did the signal start to drift?" Zhou Jianhua raised his head and asked.

"It started here with the carrier generator." Zhang Gong pointed roughly.

"Oh......" Zhou Jianhua nodded. The circuit diagram shows that the components of this model of walkie-talkie are basically discrete components, and the carrier generator circuit of the discrete components is not complicated. The more simple the circuit, the higher the requirements for components, Zhou Jianhua knew that the channel is the problem of the amplification transistor of the oscillation amplification circuit in the carrier generator.

"It's a problem with this transistor, right?!" Zhou Jianhua said casually.

"Hehe, sure enough, there are two ......" Zhang Gong nodded approvingly.

General electronic professional technician level people, through the circuit diagram and fault phenomena can analyze which component is the problem, but there are very few people like Zhou Jianhua who can judge within a few seconds, unless he is very familiar with the circuit diagram of this model walkie-talkie in advance, but this is a military walkie-talkie, ordinary people can not touch, even Zhang Gong himself, can not be judged so quickly.

"Sister Wang, please give me a ......pen and paper," Zhou Jianhua glanced at the ponytail girl who was standing at the counter and was looking at him in surprise.

"Oh......" The ponytail girl replied softly, and immediately turned around and took a pen and a stack of letterhead from her desk and placed them on the counter beside Zhou Jianhua.

"Thank you!" Zhou Jianhua took the pen and paper and immediately drew it on the letterhead.

Zhou Jianhua only used minutes to draw a circuit sketch including more than 30 discrete components, and then Zhou Jianhua tore a few pieces of letterhead paper down to make scratch paper, quickly wrote and calculated on it, and marked the calculated component parameters one by one on the circuit sketch he drew.

After about ten minutes, several pieces of scratch paper were already full, Zhou Jianhua finally finished all the component parameters, "sighed", handed Zhang Gong the circuit diagram sketch he drew that had completely filled in the component parameters, smiled and said:

"This diagram is mainly composed of a differential circuit and two constant-resistance circuits, the overall function is equivalent to the amplifying transistor on the walkie-talkie, but the temperature drift is very small, which can fully meet the needs of this walkie-talkie, and the parameters of all the components in it have been marked on it - if you can trust it, use it, but you can't believe it."

Then Zhou Jianhua returned the pen and paper to the ponytail girl: "Xie Lu, Sister Wang!" ”

"Huh...... You're welcome! Uh......" The ponytail girl whispered embarrassedly, biting her lower lip lightly, and stopped talking.

Most girls in provincial towns are more generous and individualistic than girls in small rural counties. The reason why this ponytail girl is a little embarrassed is not because of her shy personality, but because she now feels that her previous attitude towards Zhou Jianhua was indeed a bit rude.

Zhou Jianhua smiled generously at the ponytail girl, and then turned his head and greeted, "Cousin, Xiao Chen, let's go!" ”

Seeing Zhou Jianhua and the three of them walking out of the store with large bags and small bags, the three people in the store were a little stunned.

Zhang Gong looked down and carefully looked at the circuit diagram drawn by Zhou Jianhua, and he didn't know whether such a set of circuits designed by this young man in more than ten minutes could really solve the problem of walkie-talkies as he said, but as a well-known expert in the field of communications in the province, he could easily see that this circuit could not solve the problem of temperature drift or not, at least it would not cause damage to the walkie-talkie.

Director Lei on the side is also an electronic technician, and he reached out to take Zhou Jianhua's sketch from Zhang Gong's hand and looked at it, and Zhang Gong's feeling was the same, I don't know if this circuit will work, but it will definitely not damage the walkie-talkie.

Director Lei saw that Zhang Gong looked at him and didn't speak, obviously waiting for him to make an idea, and after a little silence, he said to Zhang Gong:

"This picture is kind of interesting! Or...... Try? ”

Zhang Gong also smiled and nodded.

————————————————————————————

From Yangyue Road to the central square of the provincial capital, it is only a ten-minute walk. The Provincial Xinhua Bookstore is located in the northwest corner of the central square, next to the lively Provincial Department Store.

Zhou Jianhua and the three of them came to the door of the provincial Xinhua bookstore and looked inside, the bookstore of two or three hundred square meters was crowded, and it seemed that there were really many people looking for books in the provincial capital.

Due to the inconvenience of carrying large bags and small bags into the bookstore, he put several bags together on the wall on the side of the bookstore door, and Xiao Chen watched alone, and Zhou Jianhua and Lin Dongming entered the bookstore together.

"Cousin, are you okay in the mechanic shop now?" Zhou Jianhua asked. Yesterday afternoon, when he was in the machine repair factory, Zhou Jianhua also asked the same question to his cousin, and there were many people next to him at that time, and it was inconvenient for Lin Dongming to talk about it in detail, so Zhou Jianhua asked again now.

"That's it, it's okay." Lin Dongming replied lightly: "I just feel that I can't learn anything, and after reading books for so many years, it won't be of much use there......"

"You didn't tell me last time - when will you be able to become a full apprentice?" Zhou Jianhua asked again.

"This ...... It depends on the meaning of the leader, in fact, it makes no difference if you are dissatisfied with the apprentice or not, that is, the salary can be a few more yuan. ”

"How much do you get paid each month now?"

"Nineteen."

"Cousin, do you want to earn ninety yuan a month?"

"Ninety?! How could it be ......"

"Of course it is!"

"How do you earn it?"

"Earn by skill!"

"Hehe, what kind of skills do I have...... I can't compare to you. ”

"Why can't you compare with me? Didn't you also graduate from junior high school? ”

"But you have the skills, I don't."

"My skills are all self-taught, do you want to learn some skills by yourself to make more money?"

"Self-taught? I'm not as good as you! I'm afraid I won't be able to learn......"

"Buy a few books and read for yourself, if you encounter something you don't understand, I can teach you - if you really want to earn 90 yuan a month, just listen to me and learn skills!"

"How much can you really earn?"

"Absolutely! As long as you can learn it, you can get 90 yuan every month after half a year! ”

"What to learn?"

"Learn your trades – metalworking. At present, I will learn casting, forging, and heat treatment, and then I will learn some other things such as cutting, welding, etc...... I'll buy you a few books, as long as you can learn them within half a year, I guarantee that you will earn 90 yuan a month after half a year! ”

"Really?!"

"Really!"

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