Otaku Engineer in Great Tang Dynasty

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The day when the fleet sailed south was getting closer.

Anyone with a little foresight can realize how lucrative the southward expedition is this time, and there is also the imperial army escort, so there is no need to worry about safety issues, it is a godsend opportunity. Therefore, there are also rare labor shortages in the major shipping companies. You can see some notices for recruiting sailors all over Chang'an City. As long as you are good in water and not seasick, hurry up and sign up! The owner of the ship will give you a generous settlement first, but when you come back from the southern trade, the wages will be enough for your family for 20 years!

The workshop was even more fiery. Since some of the precision parts of the compass were previously polished by a few masters, the efficiency was very low. Seeing that more and more people were looking for a compass outside, Fubo asked Li Zexuan for instructions, and decided to organize young craftsmen to learn from the masters. Technology, who can learn it, will be rewarded with five coins at one time on the spot.

Under the heavy reward, there must be brave men. Among the young craftsmen, a large number of smart and skillful people immediately emerged. The precision parts they polished are not inferior to those of the old masters.

In this way, with a steady stream of new troops joining in, and with the advanced assembly line production model, the output of the compass has continued to skyrocket day by day.

On the first day, Fifty Compasses were supplied by Troll Gallery, and they were all sold out in less than a quarter of an hour.

The next day, Trolley Pavilion supplied 300 compasses, and in less than half an hour, they were still sold out.

On the third day, Qiqu Pavilion supplied 800 compasses, and finally they were not looted. The market for compasses is already saturated. After all, there are only more than 1,000 merchant ships going south, and not every merchant ship owner is like Wang Ren. Just like the local tyrant, each ship should be equipped with a compass.

Sun Huaiyuan saw this and hurriedly gave feedback to the workshop. Fubo got the news and immediately transferred more than half of the people from the Compass production echelon to produce carriages. According to Li Zexuan's previous plan, it was time to push the carriages out. sold.

………………

Three days passed in a blink of an eye.

The people outside are preparing for the vigorous southward action. Deep in the workshop, Zuifengxuan and Li Zexuan are also very busy.

This guy is already showing signs of going crazy. In the past three days, he has spent more than 90% of the time in the "lab" (cough, sleep is also there), and he has experienced the hardships of the past few days. Fighting hard, Li Zexuan really came up with a baby, and he is a rare baby in the world, but his current image is a bit sloppy.

"Haha, I finally made two telegraphs!"

Compared with the previous image of a handsome boy in Yushu Linfeng, Li Zexuan's hair is a little messy now, and his eye sockets are sunken, which is an obvious sign of staying up late. At this moment, he looked at the pile of devices on the table, and laughed like a madman.

That's right, the communication tool Li Zexuan wants to do is a telegraph, and it's a wireless telegraph. The principle of the radio is very simple. The core part is the lc oscillator circuit, which uses the inductor l and the capacitor c to form the oscillator circuit of the frequency selection network, which is used to generate a high-frequency sine wave signal.

The radiation power of the lc oscillation circuit is proportional to the fourth power of the oscillation frequency. To make the lc oscillation circuit radiate strong enough electromagnetic waves, the oscillation frequency must be increased and the circuit has an open form.

Although the principle is very simple, in this era, there are no electronic components that Li Zexuan can use. It is really difficult to do it. There are many technical difficulties, such as the signal modulation of the ticker, the production of the buzzer, etc. Fortunately, these difficulties were overcome by Li Zexuan, who was in retreat for three days. After untold hardships, he finally stumbled and got two wireless telegraphs.

But unfortunately, there is one difficulty that he cannot overcome at present, and that is the problem of power amplification, which is also one of the biggest technical difficulties that the electronics industry must break through in order to make progress in this era - the triode.

Transistor is one of the basic components of semiconductors. It has the function of current amplification and is the core component of electronic circuits. Without transistors, there would be no integrated circuits, and there would be no electronic products in modern society.

In fact, the lc oscillator circuit needs an amplifying element, that is, a triode. Of course, an integrated op amp and other digital lc can also be used. Using this amplifying element, the oscillating signal that is continuously consumed is fed back and amplified by various signal feedback methods. , so as to finally output a signal whose amplitude and frequency are relatively stable, so that the radio signal can be transmitted farther.

Li Zexuan understands these principles, but what's the use of understanding them? He can't make a triode now, so he can only try to make a wireless telegraph first, because he has a bit of luck in his heart, that is, in ancient times, when there was no electricity, the space spectrum was very clean, and there was almost no interference. With just a few watts of RF power, it can travel around the world.

The earliest wireless telegraphs did not use triodes. The transmission distance at that time was 250 meters, but there was already electricity in that era, and the space spectrum was not clean, and there would be electromagnetic interference.

During the war of liberation, **** was in Yan'an, and Lin (Biao) was in Harbin. They met for more than 2,000 kilometers. There was no relay station in between, and they all communicated directly by radio. At that time, the radiated power of the telegraph was only a few watts, which was enough If it has spread so far, it will definitely not work if it is left in modern society.

"Master, don't move, Xiaoxi is combing your hair!"

Li Zexuan was laughing wildly there, but Xiaoxi behind him was not happy. These days, Li Zexuan locked himself in the "laboratory". Whenever he encountered a problem, he couldn't help scratching his head. Ancient men were not like modern boys with short hair. They all have long hair, so the most

Recently, his hair has always been messy. In order to maintain a good image for his young master, Xiaoxi spends a long time combing Li Zexuan's hair every day.

"Haha, no need to comb, no need to comb! Come on, Xiaoxi, try my latest invention, Master!"

Only then did Li Zexuan notice that there were people behind him, he turned around, pinched Xiaoxi's shoulders and shouted excitedly.

These days he is often in a trance, and many times he has entered a state of forgetting things and I. If Xiaoxi was not here to take care of him, it is estimated that he was either starved to death or sloppy to death by himself. In the end, although he could also use a wireless telegraph Come out, but the final situation will definitely be countless times worse than it is now.

"Master~! Wait a minute, let me comb your hair first."

Xiaoxi is not surprised. In addition to taking care of Li Zexuan's diet, she is helping Li Zexuan to do various experiments these days. Having failed many times in the middle, she is not as interested in doing experiments now as she used to be.

"Okay! Okay, Xiaoxi, hurry up!"

Li Zexuan had no choice but to compromise.

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