Vol 2 Chapter 1456: Phone design and speakers!

"Xiaoxuan, how did you abuse King Wei like this? If your Majesty knows, how can he forgive you lightly?"
After solving the problem for Li Tai in the Qiqu Pavilion workshop, Li Zexuan was pulled aside by Cheng Yaojin and complained in a low voice.
"This... Uncle Cheng, where do you start? Why did I abuse the blue bird?"
Li Zexuan heard the words, and said in amazement.
Cheng Yaojin thought that Li Zexuan was embarrassed to admit it, and he could not help but curl his lips and said, "Hey! This is not abuse? When did the old man ever see Wang Wei who was not well-dressed and handsome? Look at him now. , What's the difference from the ordinary craftsman in your workshop? If he didn't make a sound just now, the old man almost didn't recognize it! In the words of their literati, it was unkempt and unkempt!"
To show that Li Tai was indeed abused, Cheng Yaojin racked his brains and used a few idioms, but unfortunately he still used the wrong one!
Li Zexuan was speechless for a while. He paused for a moment. He said: "Uncle Cheng, Qingque is participating in a cutting-edge technology research project of the academy. These few days are indeed very hard, but all of this is his willingness. You How can the old say that I abused him?"
"Research project? What research project? Oh, yes! Ugly cow kid didn't go home last weekend. Your aunt has been talking about it for a while! Could he also be involved in this research project?"
Cheng Yaojin's eyes lit up when he heard this, and then he thought of his own treasured son again, and quickly asked.
"Uh..."
Now Li Zexuan was speechless, saying that Cheng Yaojin really valued his son. With Cheng Chumo's grades and unsettled temperament, how could Li Zexuan arrange for him to do scientific research? Chumo is still recovering from his injuries in the hospital. If you tell the truth, the kid will get fattened again if he is not sure. After thinking about it, Li Zexuan can only vaguely say:
"That's right! But the research projects recently carried out by the Academy are all top secret. No one is allowed to tell anyone outside of the project. This is a rigid rule, and my nephew can't make an exception. I hope Uncle Cheng can forgive me! "
"Top secret? What project is so mysterious?"
When Cheng Yaojin heard it, he was even more interested. For Li Zexuan’s ability to create new things, Lao Cheng was 10,000 persuaded. For example, the variable speed disc brake bicycle that he can’t put down now, so Li Zexuan can be so solemn. The project, it must be a good project, so he asked unwillingly:
"Xiaoxuan, really can't tell the old man a little? You Uncle Cheng is not an outsider, so it is impossible to tell other people. Besides, you are the head of the Yanhuang Academy, aren't you making these rules? So true? What are you doing?"
Li Zexuan said helplessly: "Uncle Cheng, just because I am the head of Yanhuang Academy, I have to lead by example. If I don't abide by the rules, how can I expect other people in the academy to abide by the rules? So my nephew really can't follow this matter. You said! Don't worry, this research project is definitely beneficial to Datang!"
"No! Isn't this the equivalent of not saying?"
Old Cheng Nian uttered a word, but he also knew that it was impossible to ask the truth from Li Zexuan, so he did not continue to ask. Seeing the brand-new bicycle he was pushing, Lao Cheng became excited again. He laughed and said:
"Haha! So busy, Xiaoxuan! The old man first go back to Chang'an! That old bicycle is no longer needed, this one is enough! Haha!"
Facts have proved that Lao Cheng is a person who loves the new and dislikes the old. This old guy rode a variable-speed bicycle and left the workshop like a gust of wind. Pity the old bicycle he rode over, can only lie quietly in a corner of the workshop. Eat ashes!
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After Cheng Yaojin left, Li Zexuan arranged for someone to send the remaining variable speed bicycles to Qin Qiong, Yuchi Jingde, Niu Jinda, and Li Jing's homes. These were the closest to him. There are good things that you must not forget them. of. In addition, Li Zexuan also sent Liu Feng and Liu Yun to the palace to give three variable-speed bicycles to Li Er, Li Chengqian and Changle.
It is said that after the cure of Changle's qi disease, the whole person is more lively and active than before. Now it is just right to send her a variable-speed bicycle!
"Qing Que, I suddenly had an idea as a teacher, is it feasible for you to come and listen?"
After all arrangements were made, Li Zexuan went to a courtyard in the deepest part of the workshop, found Li Tai who was modifying the telegraph, and said.
This other courtyard is the secret research base of the Academy’s second and third assassin projects. Outside the courtyard is guarded by Li Zexuan’s guards day and night. All personnel entering and leaving must be verified for identity, which is considered tight guard!
At present, the participants of these two killer projects are intensively recruiting and screening, but this does not affect Li Tai, the deputy chief designer, to promote related work. In just a few days, Li Tai has created a simple With electronic components such as resistors, capacitors, and inductors, coupled with the electronic diodes and electronic transistors made by the workshop, it can be said that the foundation of Datang's electronic industry has gradually taken shape!
"Oh? Shanchang, please say!"
Hearing this, Li Tai immediately put down his work and looked up at Li Zexuan.
After "mixing" with Li Zexuan for so long, Li Tai knew that every thought of Li Zexuan could change this era. He didn't dare to despise it!
Li Zexuan pondered for a moment, and said: "Qingque, the telegraph we are making now transmits information through the mutual conversion of electricity and electromagnetic waves. This kind of telegraph is indeed able to coordinate the strategy and anticipate the enemy's opportunities when used in the military. In the future, civilians will have the need for ultra-long-distance communication, and the telegraph will appear inconvenient!
So what I think is that we might be able to make a device that converts sound into electricity, and then electricity into sound. That way, only one wire connection is needed to achieve real-time sound transmission at both ends of the wire! "
This is actually a wired phone. Li Zexuan wanted to do it a long time ago, but before Datang had no industrial foundation and couldn’t do it if he wanted to. Now it’s different...
This remark might sound like a fantasy to others, but Li Tai did not rush to deny it. He pondered for a long time before he said:
"Electric harmony? Shan Chang, your idea sounds okay, but when it comes to implementation, our first step is to solve the problem of how to convert the two completely different energies of electric harmony to each other!"
profession!
I have to say that Li Tai is now more professional than before, and he can see the essence of the problem at a glance.
Li Zexuan expressed his appreciation and said: "Haha! Qingque, you are right! To achieve long-distance real-time sound transmission, the first problem is to solve the problem of mutual conversion between electric and sound! Although they are two different energies, but It may not be impossible to transform each other! For example, the previous electricity and magnetism are not of the same kind, but with Miss Mo’s efforts, can they not be transformed into each other now? I have a preliminary idea here. Let me talk about it. Listen, think about it in private!"
"Yeah! Shanchang, please say!"
Li Tai nodded hurriedly, not at all downhearted because Li Zexuan wanted to add a burden to him. He is a person who is born with a new love and pursues new technology. Otherwise, he would not let the Xiaoyao lord improper, and would run to the workshop to suffer!
Li Zexuan picked up paper and pen, and drew while writing: "In fact, it is not difficult to convert electrical energy and sound energy to each other, but magnetic energy is needed in the middle to be an intermediate medium! You see, green bird, we can be at the front of the machine Use this cone-shaped paper cone to collect sound. You have learned "Physics". You should know that sound is a sound wave generated by the vibration of an object. Similarly, when the sound wave hits the paper cone, it will make the surface of the paper cone. Produce tiny vibrations.
At this time, if we attach a copper coil to the bottom of the paper cone, and then place the copper coil in a permanent magnetic field, when the front of the paper cone receives sound, it will drive the coil to vibrate, and the coil will cut the magnetic induction line. With the current corresponding to the frequency of the sound wave, we have completed the process of generating electricity by sound wave!
How to convert electricity into sound waves is also simple. It is also possible to attach a coil to the bottom of the paper cone and apply a permanent magnetic field. When the current passes through the coil, the corresponding magnetic field is generated in the coil. This magnetic field and the applied permanent magnetic field produce an interaction force. This force causes the coil to vibrate with the sound current in the applied permanent magnetic field. The cone diaphragm and the coil are connected together, so the diaphragm also vibrates .
Green bird, you should know that under the same voltage, the size of the magnetic field generated by the same energized coil is proportional to the size of the current. Therefore, when the current passing through the coil is larger, the coil moves in the magnetic field more violently, and the louder the sound is. , So the vibration of the coil can produce a sound similar or identical to the original audio signal waveform.
As a result, we can realize the conversion from sound to electric current and then electric current to sound. As long as the wire is long enough and the electric energy is large enough, our voice can travel far enough! "
Li Tai was a little dumbfounded. Faced with such an ingenious design, he was so excited that even his breath was overwhelming. Perhaps this was just suffocating for dreams!
After a long time, Li Tai finally recovered from the shock. He took a few deep breaths, then looked at Li Zexuan with the look of monsters, opened his mouth, and couldn't speak for a long time!
"Mountain...Mountain long, this design is so ingenious! It's so ingenious and amazing!"
Shaking his lips for a long time, Li Tai finally said, "If it can be done, then there will be no need for a telegraph machine! Shan Chang, otherwise we will directly start researching this kind of sound transmission machine and give up improving the telegraph machine, how about? "
Li Zexuan hurriedly waved his hand and said, "No! Qingque, what I told you just now was just my idea. From idea to product, there is still a long way to go, even if you make it. The later audio debugging will take a long time, and the improvement plan of the telegraph has been deliberated countless times, and now it is completely natural.
Moreover, compared to this kind of sound transmission thing, the telegraph is not useless, especially for military communications, the telegraph has better confidentiality, even if the enemy seizes our telegraph, they do not have a codebook. use! In addition, the telegraph machine does not require wires to send and receive telegrams, which is the most convenient when fighting! So in any case, be sure to change the telegraph machine first! "
Hearing what Li Zexuan said, Li Tai also woke up from his excitement. He nodded and said, "Well! I understand!"
It's just that a touch of disappointment flashed in his eyes. The feeling that he knew that there was a more advanced thing, but he didn't have the time to create it for a while was really uncomfortable for Li Tai!
Li Zexuan smiled when he saw it. He patted Li Tai on the shoulder and said, "However, although we currently do not have the energy to build such a long-distance sound transmission machine, we can build a simple sound-electric conversion device first. It won't take long!"
"Oh? Shan Chang, what do you say?"
Li Tai's eyes lit up and said quickly.
Li Zexuan smiled and said, "I just want to make a small thing. Qingque will help you make it for the teacher! This thing is to use the paper cone diaphragm to convert the human voice into electric current, and then use a triode to amplify the current. The current flows through the coil, and then through the action of the magnetic field, it vibrates with a more violent amplitude, so that the sound that comes out is louder! I call this thing a loudspeaker or a speaker, compared to the kind of long-distance sound transmission machine ~EbookFREE.me~ This thing is much simpler, if you have the time, try to make one first!"
Li Tai thought about it in his mind, and then excitedly said: "This is a good idea! The loudspeaker is simple to make, but the principle is similar to that of a long-distance sound transmission machine. If you can make this thing, you can do that in the future. Distance Transsion’s machine is even more informed!"
Li Zexuan nodded and said, "That's exactly the truth!"
Having said that, he looked at the shadow of the tree outside the house and said, "Okay! Let's do this first, Qingque, you keep busy, I will go now!"
Li Tai hurriedly bowed and said, "The long mountain walks slowly!"
After experiencing this incident, he admired Li Zexuan even more. It was like a mountain looking up, Jingxing and walking, although he couldn't reach it, he yearned for it!
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"Your Majesty, your Royal Highness, please see you!"
About Shenshi, the palace, Ganlu Hall.
After reviewing the memorial for a while, Li Er, who was dozing off his chin, was suddenly awakened by a shrill voice. Who else could it be if it wasn't Zhao Song? Speaking of this "special" moment, only Zhao Song dared to come over and report the matter.
"Oh? Cheng Qian is here? Let him in!"
Li Er rubbed his sleepy face and cheered up.
"Here~!"
Zhao Song took the order and left, and couldn't help but breathe a sigh of relief in his heart.
After a while, Li Chengqian came in, and he didn't come in alone, he also... pushed a car!
Seeing this, Lao Li immediately lost any sleepiness. Before Li Chengqian saluted him, he opened his mouth and said: "Chengqian, why did you push a bike in? Huh? No! This bike seems a little weird... ...."
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