Siheyuan starts from the stationmaster

Chapter 152 Stereo Radio
Bai Zirui took Cai Lijian to Guo Jianjun's booth on Gaodi Street again. Guo Jianjun laughed loudly when he saw him: "Brother Bai, it seems that the business is good for the second purchase so soon!"

Bai Zirui said with a smile: "It's all thanks to Brother Guo, the business is so-so."

Guo Jianjun looked at Cai Lijian who came with him, and asked, "Brother Bai, who is this little brother?"

Bai Zirui introduced: "Brother Guo, this is one of my brothers named Cai Lijian. I still have to study in school today and I have no time to be a clone. From now on, he will come to Yangcheng to buy goods from you. This time, I will bring him to meet you." For a moment, I hope you will take care of me in the future."

After Bai Zirui introduced the two of them, Guo Jianjun asked, "Brother Bai, what are you going to buy this time?"

This time, Bai Zirui not only brought in the 7500 yuan that Cai Lijian and the others had sold electronic watches and issued cards in the past two days, but also added 2500 yuan, making a total of 10000 yuan to purchase.

A few days ago, the bat shirt and trousers that Bai Zirui brought back to Xu Huizhen, Xu Jingli and the others had caused a sensation in the Daqianmen area, as well as Xu Jingli, Xu Jingping's school after a few days of fermentation. After all, it is a woman's nature to love beauty. Ask them where to buy bat shirts and running pants?

Therefore, clothes for going south to Yangcheng are also on Bai Zirui's shopping list. In addition to electronic watches, flashlights, clothes, and card issuers, there are also tape recorders, computers, and a batch of electronic parts. The students majoring in wireless electronics helped to assemble the stereo radio.

Due to the large quantity and variety of goods purchased this time, Guo Jianjun found a few friends to prepare all the goods that Bai Zirui needed, so that he could get to know several friends of Guo Jianjun. Several of his friends drank together and formed a long-term relationship.

Bai Zirui and Cai Lijian returned to Beijing with the goods, and He Yuzhu waited beside the railway with a few educated youths just like last time. The two threw the goods from the window of the train, and He Yuzhu and the others climbed over the wall and got out of the train after picking them up. Station to meet Bai Zirui, and together they transported the goods to the house he rented in Zhongguancun.

Bai Zirui and Cai Lijian went back and forth from Beijing to Yangcheng to buy goods. Three days had passed. Meng Xiaoxing had sold out all the 200 flashlights that Bai Zirui had given her during these three days. Not long after they shipped the goods back, Meng Xiaoxing took a car from the countryside to Zhongguancun to find him to pick up the goods.

Meng Xiaoxing went into the house that Bai Zirui was renting, and saw the dazzling array of goods he brought in. She didn't expect that Bai Zirui's business would be so big, with so many goods, it would almost catch up with the state-run store.

Bai Zirui gathered everyone together, and said with a smile: "This time we have a sufficient quantity and variety of goods. I'm going to match you with a bicycle. You can use your bicycle to sell things throughout the capital."

After listening to Bai Zirui's words, everyone was refreshed. They used to walk around Zhongguancun on two legs, and they couldn't go too far. With bicycles, they can go to more and farther places to sell things. The more things they produce, the higher their commissions will be.

Next, Bai Zirui took everyone to the recycling station where he worked before, and found Feng Zixuan. He sold them a large number of scrapped bicycles at the price of scrap without saying a word.

Bai Zirui started to assemble the bicycles immediately, Cai Lijian and Meng Xiaoxing assembled 11 bicycles each, and rode the 5 extra bicycles assembled to a fast food courtyard near Zhengliangmen for emergency use.

The next day, when Xu Lijian and the others were riding bicycles to sell things in the streets and alleys of the capital, Bai Zirui was a little helpless with a batch of electronic parts, which were needed to assemble a stereo radio.

A stereo radio is a radio that can receive stereo radio programs and have stereo playback effects.The sound broadcasting system includes FM stereo and AM stereo, therefore, there are FM stereo radio and AM stereo radio respectively.

However, since the latter is in the stage of development and trial broadcasting, most stereo broadcasts are FM stereo broadcasts, so stereo radios are generally FM stereo radios, especially this year is the first year of China's stereo FM broadcasts.

The earliest radio broadcasting was AM broadcasting, which were long wave, medium wave and short wave, so the radio at that time was also called three-band radio.Later, in the 30s, FM radio was invented, and then it developed rapidly in the world.

Compared with AM broadcasting, FM broadcasting has stronger anti-interference ability and bandwidth, and therefore, it can play high-fidelity stereo broadcasting comparable to CD sound quality, bringing people unparalleled listening enjoyment.Even at a press conference, some professionals mistook the FM stereo broadcast for playing stereo, which shows that its sound quality is good.

The development of FM broadcasting in China is much behind that of developed countries. On New Year’s Day in 1959, Beijing began to broadcast FM broadcasting with a frequency band of 64.5-73MHz. In 1979, Harbin was the first to realize stereo FM broadcasting. Since then, China has officially entered the era of stereo FM broadcasting.

Of course, the technology of FM radio is definitely much higher than that of AM radio, especially listening to stereo FM radio is not easy, so even though stereo FM radio has been widely promoted in China this year, there are still radios that can listen to FM stereo radio on the market. Very few, except for big brands such as Peony and Panda, almost all of them are imported products.The radio at this time was still dominated by single-speaker three-band radios.

Bai Zirui knew that relying on the beautiful sound quality, the radio market in the future would be dominated by four-band stereo radios, especially those young people who were about to get married would prefer to buy four-band stereo radios that could listen to high-quality songs.

Bai Zirui's thoughts turned, and many blueprints of radio circuits appeared in his mind instantly.He was also considered an electronics enthusiast in his previous life. He not only bought a lot of electronic technology books, but also often visited professional electronic forums to download various blueprints.These blueprints are all excellent designs that have undergone a lot of testing in later generations, and are good things that are posted on the forum by various masters.

Of course, most of the drawings need to use SMD originals and integrated circuits, but the principle itself is not too profound.He decomposed the functions of these integrated components and replaced them with electronic components that could be found in China in the 70s.

Although there are blueprints for assembling stereo radios, when it comes to microelectronic devices such as integrated circuits, a certain process is required to interconnect the transistors, resistors, capacitors, inductors and other components and wiring required in a circuit. A small or several small semiconductor wafers or dielectric substrates are packaged in a package to become a microstructure with the required circuit functions.

In his previous life, he had only assembled ore radios and tube radios by himself. These two simplest radios were a bit incomprehensible to the high-precision technology of integrated circuits needed for stereo radios.

　Thank you so much for your precious monthly ticket support!

　　
　
(End of this chapter)