Su Qingyun shook his head and said, "They can all be sent to the recycling station. There is no room for repair." Radios are different from bicycles. Bicycles are mechanically assembled, while radios are electronic components. If they break, there is basically no way to fix them.
"That's true." Ji Yue thought about it and it made sense. He frowned and thought for a while and said, "How about I buy another one? A 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 didn't have much money. Not only did it charge low tuition, but it also waived tuition for many poor students. If it weren't for the occasional grants from above, the school would have been penniless long ago.
A second-hand radio only costs a few dozen dollars, so he can afford it.
"No need." Su Qingyun waved his hand and said, "I have it. I'll bring it tomorrow."
She was always afraid that the radio her father gave her would be discovered by her family, so she locked it in the cabinet after using it only a few times. Now she can take it out and contribute to their competition, which can be considered a use for it.
"That's fine." Ji Yue didn't refuse.
Su Qingyun discussed the experimental idea and the invention principle of the tape recorder with him again. As they talked, the day passed quickly.
Knowing that they were discussing the competition, several teachers turned a blind eye and let them do what they wanted. But in the eyes of the whole class, it was not the same thing.
Seeing the two of them putting their heads together and whispering to each other, their intimacy was visible to the naked eye, and the classmates all showed ambiguous smiles.
The next day, Su Qingyun brought the pocket radio hidden at home to school, and the two went to the laboratory during the afternoon study time.
The school's laboratory is on the third floor of the teaching building. Although it is called a laboratory, it actually only has some simple experimental equipment more than other classrooms. Su Qingyun looked at the few experimental equipment in front of him and sighed in his heart, how can he use these things?
But at this time, all resources are scarce. It is good enough for their rural middle school to have a laboratory. Complaining will not solve the problem. They still have to find a solution themselves.
Su Qingyun inevitably thought of the research institute in the provincial capital. Such a large research institute must be well-equipped and would not be short of resources for any experiment. Thinking of this, she couldn't help but look forward to Yan Jun's reply even more.
"What are you thinking about?" Seeing her lost in thought, Ji Yue asked in confusion.
"Nothing." Su Qingyun came back to his senses, "Let's get started."
"Okay." Ji Yue nodded.
Then, the two of them disassembled the almost brand new radio into pieces, and arranged each component in a row according to the disassembly process, ensuring that they could be reassembled 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, and then restore the received signals into audio signals through a certain demodulation, and then convert them into sound waves through the output components, and finally play them out.
To put it simply, a radio is a small radio receiver.
The above are all about the receiving part of the radio, and what they need to do is the recording part. How to record the audio and how to store the audio are all issues they need to think about.
"Any ideas? How to collect 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 uttered a word, "The magnetic effect of electric current."
Who wouldn't say he was a genius? Su Qingyun looked at him with admiration. Ji Yue was absolutely right.
That’s right, the working principle of a tape recorder is to receive sound through the magnetic effect of electric current, while the working principle of playback is electromagnetic induction.
When it comes to storing audio, the first thing Su Qingyun thinks of is tapes. Tapes have been around in the world for more than a decade, but they have hardly been used in China.
But the fact that it has not been widely used does not mean that it cannot be used. As early as when Ji Yue proposed the idea, Su Qingyun had already thought about it. What they needed to make was a tape recorder.
The tape recorder is mainly composed of a built-in microphone, tape, recording and playback heads, amplifier circuits, speakers, transmission mechanisms and other parts. Thinking of the complex components and implementation steps inside, and the simple equipment in front of him, Su Qingyun couldn't help but frowned with a headache.
She took a deep breath and decided to take it slow.
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