Otaku Engineer in Great Tang Dynasty

On the second day, there was a piece of good news from the workshop. The transistor was made, and Li Tai used a very crude ammeter to verify that it did amplify current. Li Zexuan heard the news and rushed to the workshop. .

"Mountain long, it's done! It's really done! After my preliminary measurements, after the current passed through the grid of the transistor, it was amplified by about five times! If you connect more transistors, the magnification can be even greater!"

As soon as he entered the laboratory, Li Tai greeted him with excitement.

Li Zexuan walked to the test bench, and saw a glass tube slightly smaller than a fist on the bench, and a rough meter. The meter did not even have a casing. The magnets, springs, wires, and pointers inside were all exposed. Some simple fixing devices, although Li Zexuan can roughly guess the function of this meter, the appearance of this thing is really disdainful!

As for the glass tube with a slightly smaller fist, it should be the first triode in the world, because there are three electrode connectors exposed on the outside of the glass tube, but... this triode is too big, and Li Zexuan’s previous triodes were all semiconductors. (Crystal) transistors are only the size of a fingernail, and with the development of microelectronics technology, the size of some transistors can even be less than 10nm. Compared with this, it is no exaggeration to call the electronic transistor in front of it a behemoth!

"Qing Que, you connect the power and let me see!"

Li Zexuan knew that it was not the time to pick and choose. After all, under these conditions, it is not easy for Li Taineng to make a triode. It would be a bit embarrassing to ask for something else. So he pointed to the triode on the table and told Li. Tai said.

"Okay! Long wait!"

Li Tai nodded in response, and started wiring numbly. After a while, he turned on the power switch, pointed to the electric meter, and said:

"Shanchang, you see, the current at the cathode end is 0.7, I now connect the ammeter to the anode end... Look, the current has reached 3.8, which is almost five times the magnification! This proves that the voltage on the grid is weak The signal change can modulate the current flowing from the cathode to the anode, so you can get the same current as the input signal change, but with a greatly increased intensity!"

Li Zexuan saw this series of operations in his eyes. At this time, he couldn't help but sighed: "Good! Good! Good! I didn't expect Qingque you to make a triode so quickly. It is not easy! With the addition of diodes and triodes, and making resistors with stable resistance, the Academy can begin to transform the telegraph machine!"

Li Tai thought for a while, and asked, "Shanchang, the resistor you mentioned before is used as a standard resistance. The workshop has already made it, but I think it is too big. If you need a larger resistance in the future The size of the resistor will be larger. If it is used in a circuit, it will seriously affect the volume of the entire product. I wonder if there is any material that can replace steel as a resistor?"

In order to facilitate Li Tai's production of voltmeters, Li Zexuan proposed that a steel one inch in length, width, and height can be used as a standard resistor. But speaking, although the conductivity of steel is not as good as copper, it is still good. The resistance of the iron wire is very small, and it is not suitable to be used as a resistor. Modern resistors are mostly made of nickel-chromium alloys. The chip resistors are made of metal powder and glass uranium powder and printed on the substrate by screen printing. Resistor made.

With the current process conditions, these two types of resistors have certain difficulties to be manufactured. After thinking for a long time, Li Zexuan said:

"Of course there are materials that can replace steel! For Blue Bird, you can mix carbon black, resin, and clay in a certain proportion, then press the mixture, and then heat it to make a section of resistance rods. The resistance made of this material is more than chopsticks. It should be thin, only about a quarter of an inch long, but the range of resistance values ​​can be very wide, which can fully meet the needs of various occasions!"

The resistor he mentioned is called a carbon resistor in modern times, and a color ring is used to indicate its resistance. Its materials are cheap, low in cost, and wide in resistance range, but with poor performance, it is rarely used. It is basically replaced by metal film resistors and chip resistors with more stable performance in the market.

However, for the current Datang, it is already quite remarkable to have carbon resistors!

"Carbon black, resin, clay? Shanchang, can the resistance made by these things work?"

Li Tai was stunned after hearing this. He used carbon black, resin, and clay as resistors. No matter how you listened, it didn't feel reliable!

Li Zexuan smiled slightly and said: "Why doesn't this work anymore? Not only works, but also very easy to use! If you don't believe me, Qingque, you will find a craftsman in the workshop later to help you try to make a batch of these resistors. Come out and know!"

Li Tai scratched his head and said, "Okay! Then I'll find someone to try and do it later!"

Li Zexuan nodded and said, "Well! That's the thing to say! This afternoon, I will officially announce the launch of the second and third assassin projects at the academy, and you will also participate in Qingque!"

"Huh? Shan Chang, what can I do if I go to this kind of meeting? If I don't go or not, there are a lot of things on my side!"

Li Tai quickly shook his head when he heard it.

When it comes to major projects like Assassin Project, they are basically led by the masters of the academy. The students only play a role in assisting them. Li Tai thinks it is better not to attend this kind of meeting, which is a waste of time!

Unexpectedly, Li Zexuan still insisted: "Qingque, you must go to this meeting this afternoon, after all, you can't do without you for the two killer projects behind this!"

After all, he left without waiting for Li Tai to react.

"I can't do without me? What does Shan Chang mean?"

Li Tai was puzzled. Gradually, he suddenly thought of something, and he couldn't help but feel excited.

...........................

"Today, I have gathered all the gentlemen for this meeting, mainly because I have an important thing to announce!"

Before three minutes, all the teachers of the college were summoned to the large conference room on the first floor of the Guanghua Building. As for the students of the college, the first two sessions in the afternoon were naturally changed to self-study temporarily. Anyway, it is nearing the end of the semester. Basically, every class It's all over, and the students just need time to review. Seeing that all the teachers were here, Li Zexuan said in a deep voice.

Seeing that Li Zexuan was so solemn, everyone couldn't help but raised the spirit of twelve points one by one, waiting for the following.

Just listen to Li Zexuan said: “All the gentlemen present here have passed the college confidentiality examination and signed a confidentiality agreement. Today’s meeting is a top-secret meeting. The minutes of the meeting are directly classified as top-secret documents. After the meeting, Mr. Yan will send someone to file and lock it. Save, and what you hear for a while, you are not allowed to leak to others, including your family. Offenders will be handed over to Dali Temple for treason. I hope you can take it seriously!"

Hearing this, everyone's expressions couldn't help becoming serious. Since the establishment of a strict secrecy system in the academy, there has never been a top-secret incident. You must know that top-secret technologies are related to national security. With life and death, there will be no documents defined as top secret, but it also shows that today's meeting is high in specifications and important in content!

Everyone bowed their hands with serious faces: "Yes! Shan Chang! I will strictly abide by the academy's confidentiality system, and will never leak the content of today's meeting!"

"Okay! Then the formal meeting now!"

Li Zexuan nodded and said in a deep voice: "I am calling you here today to inform you that starting from today, the second and third killer features of Yanhuang Academy have officially started. Yes, you heard it right. They are two killers. The project was approved at the same time!"

The scholars present here all felt incredible. At the beginning of the year, Li Zexuan proposed the Yanhuang Academy’s one hundred killer project plan, and used the Bahe Hydropower Station as the first killer project. Until now, the first killer project has not been completed. Because the later work of the hydropower station has not been completed yet, Li Zexuan has directly proposed two more killer projects. In the eyes of everyone, the progress is really too fast!

And at the beginning of the meeting, Li Zexuan defined these two killer projects as top-secret projects. This high-level specification made the gentlemen of the academy feel solemn!

"Shanchang, what are the contents of the second and third killer projects? Will it be too stressful to carry out at the same time?"

Mo Huai couldn't help but ask.

Others also set their sights on Li Zexuan.

Li Zexuan replied: "Of course there is pressure, but it must be overcome. The reason why I chose to establish the two killer projects at the same time has good reasons. Let me talk about the specific tasks of these two projects!

The second killer project is to improve the current telegraph. One is to add a signal amplification circuit to the telegraph to increase the transmission power of the telegraph; the second is to install a detector for the telegraph to identify useful information in electromagnetic waves. Enhance the signal recognition ability and anti-interference ability of the telegraph; the third is to build telegraph relay stations in key states and counties to be used as a relay for electromagnetic wave transmission and reception, and further increase the communication distance of the telegraph!

The ultimate goal of this killer project is to increase the effective communication distance of the telegraph by more than a thousand miles, or even further! The key electronic components needed in this project are already done in the workshop. Those who participate in the project can go to the workshop for details later! "

"The communication distance is one kilometer!"

Hearing this indicator, everyone present couldn't help taking a breath, Qianli Sound Transmission, this is really equivalent to Qianli Sound Transmission! If this is left before, if they hear this, they will definitely sneer, but in the past year at Yanhuang Academy, they have seen too many incredible things, so gentlemen, even if they think it is weird, there is no one. Refute!

Seeing everyone with an incredible expression, Li Zexuan smiled and said, "Although this sounds weird, you have been in the academy for so long and have a certain understanding of engineering, especially gentlemen in the physics group. You should be clear. The goal I just said is not completely impossible to achieve, right?"

The physics gentlemen around Mo Huai were all hesitating in the catalog, and their faces were moving.

Mo Huai arched his hands: "Shan Chang just said that it is not completely impossible. The crux of the question is, does the workshop have devices that can perform power amplification and electromagnetic wave detection? If so, there are those with a communication distance of one thousand miles. It may happen!"

Li Zexuan heard the words and smiled and said: "This Mr. Mo can rest assured, now that everything is basically ready, I only owe the wind! Let me talk about the third killer project! From now on, the Academy will set up a Measurement Standards Committee, which will be appointed by me. The general president, Mr. Xu Hongzhi, Mo Huai, and Wang Ji, are the vice presidents. The purpose of establishing the Measurement Standards Committee is to formulate measurement units and measurement standards for some new physical quantities, such as current, voltage, resistance, and so on!

In this third killer project, the three physical quantities of current, voltage, and resistance must first be used to formulate measurement units and standards, and to produce measuring instruments. In addition, I plan to reformulate the unit of length, from small to large, which are millimeters, centimeters, decimeters, meters, and kilometers. Among them, 3.07 meters is equivalent to the current one.

One meter is equal to ten meters, one hundred centimeters, and one thousand millimeters. According to this conversion relationship, the academy needs to make a new measuring ruler. In the future, all projects of the academy will use this new Measuring unit ~www.ltnovel.com~ This is conducive to more precise production!

The reason why two killer projects are set up and carried out at the same time is mainly because there are many cross-links in these two projects, which can promote and promote each other! "

(According to the literature, one zhang in the Tang Dynasty is approximately equal to 3.07 meters)

As soon as the voice fell, there was a faint "buzz" sound in the conference room.

Li Zexuan has to formulate units and measurement standards for new physical quantities. He has to change the unit of length that has been deeply rooted in everyone's mind. This is a bit difficult to adapt!

But the reason Li Zexuan gave is too strong, because the new unit is indeed more precise than the previous inches, feet, and feet, and it is also more conducive to precision machining and precision production.

"Haha! I know that you may not be able to accept the new measuring unit for a while, but when you participate in precision manufacturing projects in the future, you will know the benefits of this new measuring unit!"

Seeing the unacceptable expressions on everyone's faces, Li Zexuan smiled and said in a deep voice:

"Next, I will announce the personnel appointments for these two assassin projects! Mr. Mo Huai is appointed as the chief designer of these two assassin projects, and Li Tai, Mo Chui, and Xu Hongzhi are the negative chief designers. Several should be transferred to the academy as soon as possible. Students and teachers with outstanding achievements in mathematics and physics join these two killer projects! The deadline for these two tasks is four months, and within four months, the set goals must be reached!"

Everyone was shocked when the words came out. At this time, the gentlemen of the academy noticed that Li Tai had been standing behind Li Zexuan and asked a student to serve as the deputy chief of Assassin Engineering, Li Zexuan. Is it crazy?

........................