The fourth archway is located not far from the north of the drum tower.

After less than ten minutes of riding, Duan Yun came to the oil mill lane that Xiaozi said.

Sure enough, there is a hardware store at the entrance of the alley, and at the door of a bungalow facing the street next to the store, there is a sign that reads 'Daxing Radio Amateur Home'.

In the era of developed communications in later generations, radio is a very niche hobby, but in today's era of lack of entertainment and high intellectual curiosity of the public, many people are still very interested in electronic radio, although it cannot be compared with the popular folk literature society, but in many larger cities, there are also government-approved folk enthusiast associations.

The so-called radio amateurs are not specialized in radio work, but have mastered certain electronic skills to learn, produce, and use radio, so as to learn, apply and master radio, so as to produce fun for it, and realize the simple problems of life, study and work.

After joining, you must first learn the basic knowledge of radio, master the basic operation of Morse code, first listen to the main, only after obtaining the qualification to have the right to transmit, and finally even have a personal radio station, because our national radio station is basically collective-based, so if you want to contact the real radio station, you can only join this kind of government-approved organization.

Daxing is a national key energy-based city with a large population base and many enthusiasts who like radio.

At the beginning, when the association was first established, every Sunday when the association was active, only some internal members would occasionally exchange some second-hand electronic components with each other, and with the increasing number of members of this radio, the number of people who exchanged electronic components and even old electrical appliances with each other gradually increased, so that to now, not only the members of the internal trading exchange of various components, and even the development of electronic second-hand trading street, many local citizens and electricians have also come here to exchange the electronic components they need.

Since the beginning of this year, the second-hand electronic trading in Youfang Lane on Sundays has been a small scale, and many electronics enthusiasts have also taken out some cheap and high-quality small electrical appliances made by themselves to sell here.

Although there are some electronic technology masters who sell homemade small electrical appliances here, in general, the small electrical appliances they design are not high-tech, such as bicycle lights, adjustable fans, and high-end and complex electrical appliances need to be customized by experts.

Since it is a reason for internal communication among members in the name of a radio association approved by the government, the business department does not regulate such second-hand exchange activities.

Every Sunday afternoon, Oil Mill Lane is very lively, most of them are exchanging some electronic components and second-hand goods, and some electronic components are even products from the fifties and sixties.

Although these things were cheap, they were of little use to Duan Yun, so he just glanced at them and left.

When I looked at a few stalls one after another, I found that there was a speaker seller in front of me.

This immediately aroused Duan Yun's interest, and he himself also wanted to develop the audio market, so he stepped forward to watch.

The stall owner is a middle-aged man in his thirties, with a pair of high-altitude myopia glasses, and the speaker he brought is not big, only about 30 centimeters high, and the chassis workmanship is a little rough.

However, at this time, there were a lot of onlookers, a few of them were obviously rich owners, dressed very fashionably, and Duan Yun even saw a few young people riding sidecar motorcycles and happiness 250 at the mouth of the alley!

You know, people who can ride this kind of motorcycle in these years can definitely be called rich, riding on the street is quite popular, even if you drive a good car like Mercedes-Benz BMW in later generations, the return rate is completely incomparable with this motorcycle back then!

It is the so-called backing the mountain to eat the mountain.

After all, Daxing City is an energy-based city, and in the 80s, the phenomenon of illegal mining in the mining area was serious, and many local hooligan gangs and local snakes made a fortune by opening small coal kilns, which was the prototype of the 'coal boss' who later became famous throughout the country......

In addition, many villagers on the coal transportation line also made a lot of money by blocking the road and setting up blocks, and it was not until 1983 that the situation improved.

Therefore, there are still a lot of rich people in Daxing City, although many people have some shady ways to make money......

In addition, Duan Yun also found that the young nouveau riche were also dressed quite fashionably, and there were a few bells and whistles on the motorcycle sidecar, and there were colored lights on the front and rear, which were obviously not original parts.

Obviously, these people are probably here to look for 'black technology', after all, there are a lot of 'fun' things here.

"Brother, come and take a look at my speaker, the sound quality is absolutely hot, no worse than the imported one!"

"Can you compare this thing to an imported speaker?" A young man with sunglasses and bell-bottoms suddenly became interested when he heard this, and said, "Then you play a song and I'll listen to it." ”

"Wait. When the middle-aged man heard this, he connected the speaker he brought to the tape recorder, and then connected a homemade wooden box containing eight No. 3 batteries to the back of the case.

"Jump card!

When the tape recorder switch is turned on, a fast-paced disco dance music is heard from the speakers.

Duan Yun just listened to a paragraph, and he felt that this speaker was very ordinary, and it seemed to be the reason why the speaker shell was too thin, after the volume increased, the shell was still slightly trembling, resulting in a lot of noise.

In fact, it is normal for these so-called electronic masters to design such a speaker,They have an understanding of electronic technology,But for acoustics is a layman,Most of them are through some magazines and materials to learn the circuit principle of the speaker,Just make a simple finished product to make extra money,But this kind of thing is obviously not distinctive,It will not be favored by music enthusiasts。

"It's boring...... What the hell, it's far worse than my Sanyo tape recorder......" Sure enough, after listening for a while, the young man shook his head and walked away.

"Brother, don't go, my speaker is cheap, the price is easy to say......" Seeing this, the middle-aged man hurriedly stepped forward and said: "The power of my speaker is 8W, and the imported one will cost at least five or six hundred, and I will sell you two hundred and fifty ......"

"Get out!"

“......”

Duan Yun shook his head with a smile when he saw this scene, and then turned around and left.

It's just that he hadn't walked far enough when Duan Yun saw a group of people talking about something around a tall young man.

After leaning in and taking a look, Duan Yun was completely stunned.

It turned out that at this time, the tall young man was actually holding a circuit board in his hand, and in the middle of the board was a NE555 chip!