After school, Xia Qiu and Su Qingyun went home together. As usual, the two would walk for a while before riding. Xia Qiu looked at Su Qingyun's delicate side face and hesitated to speak. She really wanted to ask.
"What's wrong, Qiuqiu?" Su Qingyun asked strangely.
"It's okay." Xia Qiu still couldn't control her curiosity. She lowered her voice and asked, "Do you have someone you like now?"
"The person you like?" Su Qingyun's expression was confused, "No." How could she have the heart to think about this.
"Wait a minute." Su Qingyun suddenly asked, "You don't have a crush on someone, do you?"
"I didn't!" Xia Qiu denied, "I was asking you."
"You don't have it and I don't have it either." Su Qingyun smiled, "Why do you suddenly ask such a question?"
"It's nothing." Xia Qiu saw that her expression didn't look fake, so she didn't say anything more, because she suddenly realized that this girl didn't seem to be enlightened at all. From this point of view, Lin Jianfeng couldn't do it either. He had deceived people so much. I haven't figured this out for a long time.
"Let's go, go back early today, my mother said to fry the meat." Xia Qiu's tone became cheerful again.
Su Qingyun nodded without thinking much.
As soon as she got home, her mother handed over a letter, "Yunyun, this is the letter just sent by the postman."
"Letter?" Su Qingyun took it doubtfully. Who else would send her a letter?
Su Qingyun looked at the sender on the envelope, serious? Why is it him again? Su Qingyun was even more surprised. The last time she received a serious letter saying that she was invited to work in the research institute, she refused. Why did this happen again?
She opened the envelope and unfolded the letter. She looked carefully and saw that the letter was not long. It probably meant that there was another project over there that she wanted her to help with, and there would be project subsidies.
Good guy, haven’t you given up yet?
The most important thing for her now is waiting to take the college entrance examination. She has no intention of going to a graduate school, so she might as well forget it.
Su Qingyun found a new piece of stationery and was about to reply to Yan Yan's letter of rejection. Just after writing down a title, she paused again. If she went to the institute, wouldn't it be a good opportunity for their competition?
The research institute is an excellent place for experiments. If you can't build an electric car, you can build something else.
Su Qingyun put down her pen and rubbed her chin. She had to think carefully.
After thinking for a while, she picked up the pen and continued writing. Should she ask the research institute for their opinion first, in case they didn't agree?
She wrote a reply in a few eloquent words and prepared to send it to the town the next day.
Su Qingyun hesitated for a moment, but still didn't tell Ji Yue about it. If it didn't work, it would be disappointing.
The next day, Su Qingyun left the house early, first went to the post office to mail a letter, and then went to school. When she arrived, Ji Yue was already at his place, writing and drawing with his head down.
"You've been coming very early these days?" Su Qingyun said with a smile. In the past, Ji Yue would step on the bell to get to the classroom.
She took a look at Ji Yue's notebook, which was full of new ideas. Su Qingyun was even happier, "Do you take this competition so seriously? This is the first time I've seen you take it so seriously."
Perhaps it is because he is smart and can do whatever he wants to do effortlessly. Whether it is life or study, Ji Yue's attitude has always been a bit careless and lazy, as if he doesn't care about anything. This time, it is It was the first time she saw Ji Yue take such a serious attitude.
"This is a competition between the two of us. Of course I am serious about it." Ji Yue raised his head and said. His usual style is to do the best no matter what he does, and this time he is participating in the competition with Su Qingyun. He knows Su Qingyun is very smart and strong, so he doesn't want to be the one holding him back.
"Okay, let me see what good ideas Designer Ji has today." Su Qingyun took the notebook he handed over.
"I think this way, we don't have the conditions to make a big bicycle at the moment, but it should be possible to make a small machine. So I set my sights on the radio, which is relatively common at present. I want to invent it. A radio with more features.”
Ji Yue continued enthusiastically: "For example, the current radio is simply FM to listen to various programs. If you miss the time, you can't hear it. I wonder if I can improve it and add a recording function and playback function. This will more convenient."
Ji Yue could hear the little fat man next door to his house clamoring for fairy tales almost every day. If he missed it one day, he would howl and have no peace all night long.
He briefly talked about his idea, and Su Qingyun thought for a while and said, "You mean to make a radio cassette player?"
"Radio tape recorder?" Ji Yue thought about the name for a moment, his eyes lit up, "Yes, it's the tape recorder."
Su Qingyun looked at his bright eyes and couldn't help but want to laugh. Sure enough, no matter what age people talk about their dreams, they always look sparkling. Ji Yue looks like a young man who has finally discovered a big treasure.
"Okay, I have no objection, let's just do this." Su Qingyun said nonchalantly. This is a good idea. There is indeed no radio cassette player in China at present. This is a blank market gap.
"If it's confirmed, we have to find a way to get an old radio first." Ji Yue said a little embarrassed, "I originally had an old radio at home, but I broke it last night."
The radio belonged to his father and had been used for many years. It was broken last night and his father gave him a good scolding.
"How about we go to Uncle Wang's place and look for any abandoned radios? Can Xiu Yixiu use them?" Ji Yue thought for a while and suggested.
Su Qingyun shook his head and said: "They can all be sent to the recycling bin. There is no room for repair." Radios are different from bicycles. Bicycles are mechanically spliced, while radios are electronic components. If they break, there is basically nothing you can do.
"That's true." Ji Yue thought about it for a while and it was the same. He frowned and thought for a while, "How about I buy another one? The second-hand one shouldn't be expensive, so the school doesn't have to pay for it. .”
He knew in his heart that the school actually had very little money. Not only did it charge low tuition fees, but it also exempted and exempted tuition fees for many poor students. If it weren't for the occasional funding from above, the school would have been extremely poor.
A second-hand radio only costs a few dozen yuan, which he can afford.
"No need." Su Qingyun waved her hand and said, "I have it. I'll bring it tomorrow."
The radio her father gave her before, she was always afraid of being discovered by her family, so she locked it in the cabinet without using it a few times. Now that she can take it out and contribute to their competition, it can be considered useful.
"That's okay." Ji Yue didn't refuse.
Su Qingyun discussed the experimental idea with him again and the principle of invention of the tape recorder. The two chatted and the day passed quickly.
Knowing that they were discussing the competition, several teachers turned a blind eye and let them go, but in the eyes of the whole class, this was not the case.
Seeing the two people's heads coming together and whispering, the intimacy visible to the naked eye, all the classmates in the class showed ambiguous smiles.
The next day, Su Qingyun brought the pocket radio hidden at home to school, and the two of them went to the laboratory during the afternoon self-study class.
The school's laboratory is on the third floor of the teaching building. It is said to be a laboratory, but in fact it only has more simple experimental equipment than other classrooms. Su Qingyun looked at the countless experimental equipment in front of him and sighed in his heart, what should he do with these things? ah?
But at this time, all resources are scarce. It would be nice for their rural middle school to have a laboratory. Complaining can't solve the problem. They still have to find a solution on their own.
Su Qingyun inevitably thought of the research institute in the provincial capital. Such a large research institute must be well-equipped and would be able to do any experiments she wanted to do. Thinking of this, she couldn't help but look forward to the serious reply.
"What are you thinking about?" Seeing her lost in thought, Ji Yue asked doubtfully.
"Nothing." Su Qingyun came back to her senses, "Let's get started."
"Okay." Ji Yue nodded.
Then, the two dismantled the almost brand-new radio into pieces, arranging each part according to the disassembly order, ensuring that they could be put back intact after being disassembled.
Su Qingyun looked at the "dismembered" radio and fell into deep thought. She knew the working principle of the radio, which was to receive high-frequency signals through the antenna, then restore the received signals to audio signals through certain demodulation, and then convert them into audio signals through the output component. The sound wave is finally played out.
To put it bluntly, a radio is a small radio receiver.
The above mentioned is the part of the radio collection, and what they have to do is the recording part, how to record the audio, how to store the audio, these are the issues they have to think about.
"Any ideas? How to contain the sound?" Su Qingyun asked.
Ji Yue thought about this problem for a long time. He frowned and thought for a long time, and finally said, "The magnetic effect of electric current."
If not that he was a genius, Su Qingyun looked at him with admiration, and Ji Yue hit the nail on the head.
That's right, the working principle of radio cassette recording is achieved through the magnetic effect of current, while playback is the function of electromagnetic induction.
When it comes to storing audio, the first thing Su Qingyun thinks of is tape. Tapes have been around for more than ten years, but they have barely been used in China.
But just because it hasn't been used much doesn't mean it can't be used. As early as when Ji Yue proposed the idea, Su Qingyun had already thought about it. What they wanted to do was a tape recorder.
The tape recorder is mainly composed of internal microphones, tapes, recording and playback heads, amplification circuits, speakers, transmission mechanisms, etc. Su Qingyun frowned with a headache when thinking of the complex parts and implementation steps inside, as well as the rudimentary equipment in front of him. .
She took a deep breath, there was no need to rush this matter, take your time.
