Bai Zirui took Cai Lijian to Guo Jianjun's stall on Gaodi Street again. Guo Jianjun laughed loudly when he saw him: "Brother Bai, you are here to purchase goods for the second time so soon. It seems that business is good!"

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

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 have to go to school today and have no time to spare. From now on, he will come to Yangcheng to purchase goods from you. I will bring him to meet you this time."

I hope you will take more care of me in the future."

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

This time, Bai Zirui not only brought the 7,500 yuan that Cai Lijian and the others had spent on selling electronic watches and card issuance in the past two days, but also added an additional 2,500 yuan, for a total of 10,000 yuan to purchase goods.

The bat shirt and leggings that Bai Zirui brought back to Xu Huizhen, Xu Jingli and the others a few days ago have caused a sensation in the Daqianmen area, as well as in Xu Jingli, Xu Jingping and their school. After all, it is a woman's nature to love beauty.

Ask them where to buy bat shirts and leggings?

Therefore, clothing is also on Bai Zirui's shopping list when he goes south to Yangcheng. In addition to electronic watches, flashlights, clothes, and hair cards, there are also radio recorders, computers and a batch of electronic parts. These electronic parts he plans to buy after returning.

Students majoring in wireless electronics helped assemble the stereo radio.

Due to the large quantity and variety of goods purchased this time, Guo Jianjun found several friends to prepare all the goods Bai Zirui needed. This allowed him to get to know several of Guo Jianjun's friends. After Bai Zirui got the goods, he invited Guo Jianjun and

Several of his friends drank together and established long-term relationships.

Bai Zirui and Cai Lijian returned to Beijing with the goods. Just like last time, they asked He Yuzhu and several educated youths to wait beside the railway. The two threw the goods out of the train window. He Yuzhu and the others picked them up and climbed over the wall and got out of the train.

He met Bai Zirui at the station and together they transported the goods to the house he rented in Zhongguancun.

Bai Zirui and Cai Lijian went back and forth from the capital to Yangcheng to purchase goods. Three days had passed. During these three days, Meng Xiaoxing had sold out all the 200 flashlights that Bai Zirui had given her.

Not long after they transported the goods back, Meng Xiaoxing took a car from the countryside to Zhongguancun to pick up the goods from him.

Meng Xiaoxing entered the house rented by Bai Zirui and saw the dazzling array of goods he brought in. She did not expect that Bai Zirui's business was so big and there were so many goods that they could almost catch up with the state-owned stores.

Bai Zirui gathered everyone together and said with a smile: "This time we have a sufficient quantity and variety of goods. I am going to equip you with a bicycle. You can ride on the bicycle to sell things throughout the capital."

After hearing Bai Zirui's words, everyone became energetic. They used to walk around Zhongguancun on two legs and couldn't go very far. With bicycles, they can go to more and further places to sell things.

The more things are produced, the higher their commission will be.

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

Bai Zirui immediately started assembling bicycles. Eleven people Cai Lijian and Meng Xiaoxing assembled a bicycle each, and rode the five more assembled bicycles to a fast food restaurant near Zhengliangmen for emergency use.

The next day, when Xu Lijian and others were riding bicycles to sell things in the streets and alleys of the capital, Bai Zirui was at a loss when it came to a batch of electronic parts that were needed to assemble a stereo radio.

A stereo radio is a radio that can receive stereo broadcast programs and have stereo playback effects. Sound broadcasting systems include FM stereo and AM stereo, so there are FM stereo radios and AM stereo radios respectively.

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

Radio broadcasting began with AM broadcasting, which was divided into long wave, medium wave and short wave, so the radios at that time were also called three-band radios. Later in the 1930s, FM radio was invented and then developed rapidly in the world.

.

Compared with AM radio, FM radio has stronger anti-interference ability and bandwidth. Therefore, it can play high-fidelity stereo radio with CD quality, giving people unparalleled listening enjoyment. Even at a press conference,

Some professionals mistake FM stereo broadcasting for stereo playback, which shows how good the sound quality is.

The development of FM broadcasting in China lags far behind that of developed countries. On New Year's Day in 1959, Beijing began to trial FM broadcasting in the frequency band 64.5-73MHz. In 1979, Harbin was the first to implement 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. In particular, it is more difficult to listen to stereo FM radio. Therefore, even though stereo FM radio has been promoted on a large scale in China this year, there are still no radios on the market that can listen to FM stereo radio.

There were very few, except for big brands such as Peony and Panda, almost all of them were imported products. At this time, radios were still mainly single-speaker three-band radios.

Bai Zirui knows that relying on beautiful sound quality, the future radio market will be dominated by four-band stereo radios. Especially young people who are about to get married are more willing to buy four-band stereo radios that can listen to high-quality songs.

Bai Zirui's thoughts swirled, and many radio circuit drawings instantly appeared in his mind. In his previous life, he was also an electronics enthusiast. Not only did he buy a lot of electronic technology books, but he also often visited professional electronics forums to download various drawings. These drawings have no

First, it is not an excellent design that has been tested extensively in later generations, and is a good thing that has been posted and shared in forums by various experts.

Of course, most of the drawings require the use of SMD components and integrated circuits, but the principle itself is not profound. He decomposed the functions of these integrated components and replaced them with electronic components that could be found in China in the 1970s.

Although there are drawings for assembling a stereo radio, when it comes to micro electronic devices such as integrated circuits, a certain process needs to be used to interconnect the transistors, resistors, capacitors, inductors and other components and wiring required in a circuit to make them.

A small piece or several small pieces of semiconductor wafer or dielectric substrate are then packaged in a tube shell to become a microstructure with the required circuit functions.

In his previous life, he had only assembled mineral radios and tube radios by hand. These two simple radios were somewhat incomprehensible to the high-precision technology of integrated circuits required for stereo radios.

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