"Chenchen, can you make a radio by yourself?"
Du Bin was very curious. Normally, it was not cheap to buy a radio. Was it possible to make one by himself?
"Of course, the radio isn't difficult to make, and it comes with a complete set of accessories, which makes it even easier."
Du Chen remembers that many students who studied electronics made a radio as their first product. This not only improved their hands-on ability, but also helped them fill in the gaps in their knowledge of circuits. Therefore, the radio was considered the most suitable product for learning electronic circuits.
"Then I want to try it!"
Although there is a radio at home and it is rarely used, Du Bin is very interested in it as long as he is not studying.
"Okay, then it's a deal. Let's go to the Drum Tower together on Sunday!"
Du Chen decided it right away, and Du Bin and Ding Miaomiao also nodded in agreement.
…
On Sunday morning, Du Chen and his friends left home early, preparing to take a walk around the Drum Tower and then meet up with Zhao Pengfei and Li Qiang there.
After leaving the community gate, a few people went to a nearby place to have breakfast. They ate and drank as much as they wanted of pies that cost fifty cents each and pickled vegetables and cornmeal porridge, just don't waste it.
Du Chen couldn't help but swallow his saliva as he watched the golden, charred pie. These days, the pie is only 50 cents a pop. While cheap, it's packed with ingredients. The crust is just the right thickness, chewy but not too sticky. The filling isn't very meaty, but it's generously topped with side dishes like cabbage, leeks, and vermicelli noodles. And then there's the cornmeal porridge. It's so comforting.
For breakfast, Du Chen had two pies, Du Bin had three, and Ding Miaomiao had one. Everyone also had a bowl of cornmeal porridge. They were full and well-fed, and Du Chen patted his stomach with satisfaction.
A few people took the bus and arrived at the Drum Tower in just three stops.
As soon as they got off the bus, they saw Zhao Pengfei and Li Qiang waiting for them at the bus stop.
"Du Chen, why did you come just now? Li Qiang and I have been waiting for a while."
Sure enough, no matter when, as long as Zhao Pengfei is there, he is definitely the first one to speak.
"Li Qiang, have you had breakfast?"
Du Chen ignored Zhao Pengfei and asked Li Qiang on the side. Du Chen found that as long as you dare to interrupt Zhao Pengfei, Zhao Pengfei will talk to you endlessly. If you ignore him, Zhao Pengfei will stop talking after a while.
"I've eaten. Have you eaten too?"
"We've eaten too. Let's go and take a look at the street."
Du Chen led the group, followed by a group of people. Du Chen had no particular purpose in mind; this was his first time at the Gulou Electronics Market. Every time he came to a stall, he stopped and carefully examined the electronic components inside, trying to get a good idea of what was on display.
When passing by a stall, Du Chen was obviously interested, because this stall not only sold electronic components, but also books. Du Chen took a quick look and saw books such as "300 Questions on TV Circuits", "Electronics Enthusiasts", "Audio Enthusiasts", "Radio Enthusiasts", etc.
Looking at these books, Du Chen was obviously interested. He was planning to buy some books of this kind to read. This time he came here just to buy some materials to make a tube amplifier to play with, but he was still confused about how to make it because he had never done it before.
"Boss, can I come in and see what books we have?"
Du Chen asked a young man who was sitting behind the table and soldering a circuit board.
"Sure, come in! What book do you want to buy?"
The young man said to Du Chen without even raising his head.
"Let me take a look first! See if there's anything I'm interested in!"
"Come in and take a look! There are a lot of things, so be careful!"
Du Chen watched the young man busy with his work, and without disturbing him, he went into the store and took a copy of "Audio Enthusiast" from the bookshelf.
Du Chen flipped through the book carefully and found it quite good. He then looked at the other books on the shelf and selected a few that he liked.
"Boss, do you have any books about tube amplifiers?"
Du Chen looked at the bookshelf and couldn't find any books about tube amplifiers, so he asked the boss.
"Tube amplifier?"
Hearing that Du Chen wanted to find books about tube amplifiers, the young man finally raised his head, looked at Du Chen, and continued to ask Du Chen.
"You want to buy books about tube amplifiers?"
"Yes, Boss, that's right. I want to learn and make a tube amplifier myself."
"Sure, wait, I'll find it for you!"
After the young man finished speaking, he turned around and walked to the back of the bookshelf to look through books for Du Chen.
"Du Chen, what is a tube amplifier?"
Before Du Bin could finish his words, Zhao Pengfei, who was waiting there bored, had already started asking Du Chen.
"A tube amplifier is a vacuum tube audio amplifier that serves audio."
Du Chen briefly explained the function of the tube amplifier, but when he went into more detail, no one in the room understood.
"Du Chen..."
"Zhao Pengfei, it's hard to explain. Once I finish it, you'll understand what a tube amplifier is."
"Chenchen, how much does it cost to buy that radio?"
At this time, Du Bin also asked Du Chen that he didn't understand anything here, so he couldn't stay any longer.
"Brother, wait a minute. Let me buy the accessories and books I need first, and then I'll make the radio for you, okay?"
Du Chen looked at the few people. It was obvious that Du Bin and the others were a bit bored here, mainly because they didn't understand anything.
"Classmate, here you go! I only have so many books about amplifiers here, take a look and see which one you need!"
At this time, the young man came over with a few books.
Du Chen took the books and looked at them: "Principles of Tube Power Amplifiers", "Design and Production of Power Amplifiers", "Detailed Explanation of Transistor Power Amplifiers"...
"Boss, I want all these books!"
Du Chen flipped through it and found that the contents of current reference books were quite good, unlike the later books which were heavily padded with water, and the novels were also heavily padded with water words.
"You want them all? Can you understand?"
The young man asked Du Chen in surprise and curiosity.
"It's okay, more or less. I went back to do some research. Boss, do you have a complete range of electronic components?"
Du Chen asked the young man.
"I have all the common ones here. What do you want to do?"
"I'm planning to build a tube amplifier myself, and I'm also buying four sets of radio parts to assemble myself. Do you have any?"
"I don't have all the electronic components needed for tube amplifiers, but if you need them, I can order them for you. I also have all the radio kits. What functions do you want?"
When the young man heard Du Chen talking about tube amplifiers, he knew that he was also an expert player, so he did not look down on the other party's young age and ignore them.
"Give me two three-tube radios, not too simple or too complicated, and two single-tube radios!"
Du Chen thought about it and said to the young man, the single-tube radio is for Zhao Pengfei and Li Qiang to play with, it is simple and easy to make, and the three-tube radio is for Du Bin and Ding Miaomiao, which will also help with their knowledge of physics and electricity. After all, Du Bin and Ding Miaomiao are both planning to study science, so they can have fun and study at the same time. Du Chen thinks his idea is good.
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