The day is getting closer and closer for the fleet to go south.

People with a little foresight can realize how lucrative this trip to the south is, and there is also the escort of the imperial army, so there is no need to worry about security, it is simply a godsend. Therefore, all major shipping companies have also rarely experienced labor shortages. There are some notices recruiting sailors everywhere in Chang'an City, as long as you are good at water and do not get seasick, then hurry up and sign up! The owner of the ship will give you a generous settling-in allowance first, and when you come back from the southern trade, you will be paid enough wages for your family for twenty years!

The workshop is even more lively. Since some of the precision parts of the compass were polished by several masters before, the efficiency was very low, and seeing that there were more and more people outside who wanted to buy the compass, after Fu Bo consulted Li Zexuan, he decided to organize young craftsmen to learn technology from the masters.

There must be brave men under the heavy reward, and a large number of intelligent and ingenious people immediately emerged among the young craftsmen, and the precision parts they polished were no worse than those of the old masters.

In this way, with a steady stream of new forces to join, coupled with the advanced assembly line production mode, the output of compass continues to skyrocket day by day.

On the first day, the Quirky Pavilion supplied fifty compasses, and in less than a quarter of an hour, they were sold out.

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

On the third day, the Qiqu Pavilion supplied 500 compasses, and finally they were not sold out, and the market for compasses was beginning to be saturated, after all, there were more than 1,000 merchant ships going south, and not every merchant ship owner was as tyrant as Wang Renbiao, and every ship should be equipped with a compass.

Seeing this, Sun Huaiyuan hurriedly reported to the workshop, Fu Bo got the news, and immediately transferred more than half of the people from the compass production echelon to produce the carriage, according to Li Zexuan's previous plan, it was time to push the carriage out for sale.

…………………

Three days passed in a blink of an eye.

The people outside were preparing for the vigorous southward action, and in the depths of the workshop, Drunken Fengxuan and Li Zexuan were also busy.

In the past three days, more than 90% of the time, he has stayed in the "laboratory" (cough, sleeping is also there), after a few days of hard work, Li Zexuan has really made a baby, and it is a rare big baby in the world, but his current image is a little stumbling.

"Haha, finally two telegraphs have been made!"

Compared with the previous image of Yushu Linfeng's chic son, Li Zexuan's hair is now a little messy and his eye sockets are sunken, which is an obvious sign of staying up too 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 that Li Zexuan wants to do is a telegraph, and it is also a wireless telegraph. The principle of radio is very simple, the core part is the LC oscillation circuit, with inductor L, capacitor C to form a frequency selection network of oscillation circuit, used to generate high-frequency sine wave signal.

The radiated power of the LC oscillation circuit is proportional to the fourth power of the oscillation frequency, and in order for the LC oscillation circuit to radiate strong enough electromagnetic waves outward, the oscillation frequency must be increased and the circuit must have an open form.

Although the principle is very simple, but in this era, there are no electronic components that Li Zexuan can use, and it is really very difficult to do, among which there are many technical difficulties, such as the signal modulation of the receiver, the production of buzzers, etc., fortunately, these difficulties have been overcome one by one by Li Zexuan, who has been in retreat for three days, and after a lot of hardships, he finally stumbled to get two wireless telegraphs.

But unfortunately, there is a difficulty that he can't overcome at present, that is, the problem of power amplification, which is also the biggest technical difficulty that the electronics industry must break through if it wants to make progress in this era - transistor.

Crystal transistor is one of the basic components of semiconductors, with current amplification effect, is the core component of electronic circuits, without transistors, there are no integrated circuits, and there are no electronic products in modern society.

In fact, the LC oscillation circuit needs an amplification element, that is, a triode, of course, it can also use an integrated op amp equivalent electric LC, using this amplification element, through a variety of signal feedback methods to make the constantly consumed oscillation signal is fed back and amplified, so as to finally output a signal with a relatively stable amplitude and frequency, in order to make the radio signal transmit farther.

Li Zexuan understands these truths, but what's the use of understanding them? He can't build a triode now, so he can only try to make a wireless telegraph first, because he has a trace of luck in his heart, that is, in ancient times, when there was no electricity, the space spectrum was very clean, there was almost no interference, and as long as a few watts of radio frequency power, it could be used all over the world.

The earliest wireless telegraphs did not use transistors, and the transmission distance at that time was 250 meters, but at that time there was already electricity, 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, gathering more than 2,000 kilometers apart, and there was no relay station in between, and they were all directly communicated by radio stations.

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

Li Zexuan laughed there maniacally, but the little Xi behind him was not happy, these days Li Zexuan locked himself in the "laboratory", and when he encountered a problem, he couldn't help but scratch his head, ancient men are not like modern short-haired boys, they all have long hair, so his hair has been messy recently, Xiaoxi has to spend a long time combing Li Zexuan's hair every day in order to maintain a good image for his young master.

"Haha, no need to comb, no need to comb! Come, Xiaoxi, try my latest invention, young master! ”

Only then did Li Zexuan notice that there was someone behind him, he turned around, pinched Xiaoxi's shoulder and shouted excitedly.

If it weren't for Xiaoxi taking care of him here, it is estimated that he would either be starved to death or sloppy to death by himself, and in the end, although he could also make a wireless telegraph, but the final situation would definitely be countless times worse than now.

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

Xiaoxi is not surprised, in addition to taking care of Li Zexuan's diet and daily life in the past few days, she is helping Li Zexuan do various experiments. She failed many times in between, and she wasn't as interested in doing experiments as she used to be.

"Alright! That's okay, Xiaoxi, hurry up! ”

Li Zexuan could only reluctantly compromise.

(End of chapter)