No matter how Lin Zhenhua inquired around the corner, Lin Fanghua always blushed and refused to say why the head teacher wanted to summon her parents. Of course, Lin Zhenhua guessed at the first time whether it was his sister's early love, but after asking a few words, he felt that it was not very similar, because his sister's expression was obviously more joyful than panicked.

After dinner, the brother and sister each rode a bicycle and went to the county together. For the county, Lin Zhenhua only has some memories inherited from the past body, and he has never been there. In fact, the school also held a parent-teacher meeting last semester, but Lin Zhenhua happened to be on a business trip at that time, and Lin Fanghua asked Yang Chunshan to take the role of a parent.

Lin Fanghua took his brother to the grade group office and knocked on the door to enter. There was only a middle-aged male teacher in the office, sitting at the desk and looking at something in his hand with a magnifying glass, and when he saw Lin Fanghua coming in, he put down the thing in his hand and greeted: "Lin Fanghua is here, this is ......"

"Teacher Wei, this is my brother, Lin Zhenhua." Lin Fanghua introduced to the teacher, then turned back to Lin Zhenhua and said, "Brother, this is our homeroom teacher, Teacher Wei. ”

"Comrade Xiaolin, my name is Wei Jingwen." The head teacher stood up, shook Lin Zhenhua's hand, and then introduced himself.

After the guest and host sat down, Lin Fanghua asked Wei Jingwen for instructions, then left the office and went back to the classroom for self-study. Lin Zhenhua watched his sister walk away, then turned around and asked, "Teacher Wei, I heard Xiaofang say, you have something to do with me, is Xiaofang in trouble again?" ”

Lin Zhenhua vaguely remembered that when his parents were still alive, they went to the school to meet the teacher, and they also asked like this: Is Xiaohua in trouble again?

When Wei Jingwen heard Lin Zhenhua ask like this, he hurriedly waved his hand: "No, no, Comrade Xiaolin, you misunderstood." I invite you to come because I want you to share your experience with the parents of other students during the parent-teacher conference. ”

"Experience?" Lin Zhenhua was a little confused.

"That's right." Wei Jingwen said with a smile on his face, "In the preliminary examination at the beginning of this semester, Lin Fanghua took the first place in the class and the third place in the whole grade, which is the best result our class has achieved in the whole grade exam. What is particularly rare is that Lin Fanghua's grades were not outstanding when he entered the school, and he was still relatively backward compared to other students. In just one year, Lin Fanghua's results have risen from more than 300 to 3rd in the whole grade, which is a miracle that Fenghua Middle School has never had since its establishment. ”

"yes, that's great." Lin Zhenhua breathed a sigh of relief, and at the same time was sincerely happy for his sister, but he had to quickly say politely in his mouth: "This is mainly because the teacher has taught well, and I, as a parent, am here to express my gratitude to the teacher." ”

Regarding the reasons for Lin Fanghua's academic performance, Lin Zhenhua still knows it. Lin Fanghua has always been a relatively well-behaved child, and her grades in elementary school were okay. Later, something happened to his parents, and he was not worrying about being an elder brother, so Lin Fanghua's studies gradually went downhill. After Lin Zhenhua came back from the army, he changed to a different person, on the one hand, he was able to take care of Lin Fanghua's life, so that she could settle down to study, and on the other hand, he was able to be a tutor for Lin Fanghua and help her solve various learning difficulties. In this way, Lin Fanghua's performance has naturally risen by leaps and bounds.

"The teacher is the same for all students. The main reason why Lin Fanghua's grades can rise so fast is from his family. I heard Lin Fanghua say, you often tutor her at home, isn't that true? Wei Jingwen asked.

"Uh...... I only tutor her occasionally. Lin Zhenhua said modestly.

"However, I heard that your own education is only a junior high school graduate, how can you guide a sophomore in high school? What's more, I also learned from your junior high school homeroom teacher, and he said that when you were in junior high school, your grades didn't seem to be ideal. Wei Jingwen asked bluntly.

The county middle school is a combination of high school and junior high school, so Lin Zhenhua's bad deeds in junior high school can also be known by high school teachers. If Lin Fanghua didn't have an amazing performance, I'm afraid everyone would have forgotten Lin Zhenhua, but Lin Fanghua became a dark horse, rushing into the teachers' field of vision, and Lin Zhenhua became the object of everyone's research.

Lin Zhenhua has always had only one explanation for his bizarre knowledge, that is, he had an adventure when he was a soldier. He repeated his words about self-taught and rightist professors to Wei Jingwen, and Wei Jingwen, like other people who heard this myth for the first time, was full of envy: "Oh, this is really a lucky thing. However, it should also be said that you are eager to learn. In fact, such opportunities exist for many people, but most people do not cherish them. ”

Lin Zhenhua nodded again and again: "Yes, yes, Teacher Wei is very right." I'm a person who likes new things, so well, this, you know......"

Wei Jingwen accepted Lin Zhenhua's explanation, and then talked about the parent-teacher meeting. After chatting a few words, Wei Jingwen finally found that Lin Fanghua's model may be difficult to replicate, because parents who can guide their children in the second year of high school to study are almost rare in those years, and occasionally some parents have studied technical secondary school or even university, and their level is limited to guiding children at the middle level.

"I'm sorry, Mr. Wei, you see I really can't help." Lin Zhenhua said apologetically.

"It's okay, you don't share your experience in this area, at least show it up at the parent-teacher conference. The brother and sister who lost both parents, the elder brother supported the younger sister's studies so much, and the younger sister's grades rose rapidly, which is also a good example in itself. Wei Jingwen said.

After the two of them finished chatting, Lin Zhenhua got up to say goodbye, and accidentally saw the little toy he was studying on Wei Jingwen's table just now, and couldn't help but think about it, pointing to the toy and asking, "Teacher Wei, what is the thing you were studying just now?" ”

"Oh, it's an integrated circuit." Wei Jingwen said, "What, Comrade Xiaolin, you also have research on this?" ”

Lin Zhenhua said: "I can't talk about research, but I have just been in contact with it." What kind of chip is yours? ”

Wei Jingwen was emotional, he carefully pinched the chip, handed it to Lin Zhenhua, and said, "This is a chip imported from the United States, called NE555." ”

In fact, Lin Zhenhua had already recognized the appearance of NE555 at a glance just now, there were very few integrated circuit models back then, and the appearance of various chips was very different, so Lin Zhenhua was unlikely to admit it.

Seeing Wei Jingwen pinching the chip, as if holding a treasure, Lin Zhenhua couldn't help but want to laugh. He tapped it and said in surprise: "Teacher Wei, isn't this a waste chip, it has broken two legs." ”

"Not really!" Wei Jingwen said regretfully, "I don't know who was so careless and broke the two pins." However, if it hadn't broken this foot, it wouldn't have fallen into my hands. I broke these two legs, and I bought them at the component store for 2 dollars. ”

"But, with a broken foot, what did you buy it for?" Lin Zhenhua asked puzzled.

"Xiaolin, sit down, I'll tell you." Wei Jingwen finally found a soulmate, and no matter how much Lin Zhenhua knew, he hurriedly pulled Lin Zhenhua to sit down. He took a pair of tweezers, pointed to the various pins of the NE555, and said, "Kobayashi, look, it turned out to be eight pins, and the two that were broken, one was a high-level threshold, and the other was a low-level reset. The high level threshold is this, there is still a little bit of connector left, I am sure to solder it with a wire, and it can still be used. This foot of the low-level reset is broken, and it is a bit difficult to weld, and I am afraid that the soldering process will destroy the circuit inside. However, in many circuits, this script also needs to be empty-connected, so it is not a big problem to miss it. ”

Lin Zhenhua's eyes lit up: "Mr. Wei, do you understand circuit design?" ”

Wei Jingwen sighed lightly and said, "I can't say that I understand anything, it's just a hobby." When I was in college, I studied electrical engineering. ”

"What school did you graduate from, and what level?"

"Beihang, the sixty-second session."

"The sixty-second class of Beihang University, teaching high school here?" Lin Zhenhua gasped, could it be that there are already so many talents in China?

Wei Jingwen smiled teasingly and said, "This kind of thing is not strange. My family's composition is relatively high, and I can be assigned to middle school, and I haven't been beaten in these years, which is very good. Actually, I also like to teach, and I can cultivate a group of promising children, which is enough for this life. ”

Lin Zhenhua directly filtered Wei Jingwen's disheartened remarks, and said straightforwardly: "Mr. Wei, I am now working in the technical department of Hanhua Machinery Factory, and we are working on a new product, but it involves the part of electronic circuit control, and there is no suitable candidate yet, I don't know if you can help." ”

"Oh? What kind of circuits? Wei Jingwen asked.

"The automatic control system of the telescopic gate used at the entrance of the unit." Lin Zhenhua said.

"It's very simple, isn't it just forward and backward?" Wei Jingwen said disappointedly.

"In addition to moving forward and backward, we also wanted to be able to remotely control and automatically avoid pedestrians and vehicles," said Lin. ”

"It's a little bit complicated, but it's a problem that's been solved."

"We want to use integrated circuit control, and the main chip is the NE555." Lin Zhenhua threw out the biggest bait.

"You have a 555 circuit?" Wei Jingwen really took the bait.

Lin Zhenhua reached into his trouser pocket and found a chip that was exactly the same as Wei Jingwen's hand, but the condition was much newer than Wei Jingwen's. This is the piece of NE555 that he brought to show Populus euphratica in the afternoon, and when he left the workshop, he put it in his pocket and forgot to take it out, which came in handy at this time.

"Oh my God!" Wei Jingwen's eyes were almost bursting with fire, he almost snatched the chip from Lin Zhenhua's hand in a seizure way, then held it in his hand, looked at it carefully, and kept muttering in his mouth: "It's a brand new chip!" It's really a tyrannical thing, such a valuable chip, you and you just put it in your pocket casually! ”

Lin Zhenhua listened to Wei Jingwen's condemnation with a smile and didn't say a word. When Wei Jingwen finally eased up and felt a little sorry for his gaffe, Lin Zhenhua said leisurely: "Mr. Wei, if you promise to help us solve the problem of the control circuit, the chip in your hand will be given to you for nothing." What do you think? ”

"Yes!" Wei Jingwen agreed without hesitation, "Comrade Xiaolin, you say what you want, no matter how complicated the circuit is, I promise to design it for you." ”