Countercurrent 1982

Chapter 153 Integrated Chips
555 timer is an integrated circuit chip, often used in timers, pulse generators and oscillator circuits. The 555 can be used as a delay device, a trigger or an oscillation element in a circuit.

The 555 timer was launched by Signitick in 1971. Due to its ease of use, low price and good reliability, it is still widely used in the design of electronic circuits until later generations.Many manufacturers make 555 chips, including traditional models using bipolar transistors and versions using CMOS designs.

In the 80s, there were basically not many chips in China. Due to the precious foreign exchange, some imported chips were given priority to the cutting-edge military industry sector, and ordinary state-owned enterprises could not get them, let alone sell them in China.

Duan Yun has used this kind of chip many times in the university laboratory in his previous life. The characteristic is that only simple resistors and capacitors can complete the specific oscillation delay function. The delay range is extremely wide, from a few microseconds to hours long.

The 555 chip has a wide range of applications. It is often used as a timer in instrumentation, household appliances, electronic measurement and automatic control.

With this chip, Duan Yun can design more complex electrical equipment, and can greatly improve the performance and accuracy of many electrical equipment.

It is also because of this that Duan Yun was so excited when he saw this chip.

"Brother, how much do you sell this circuit board for?" Duan Yun asked.

"One hundred." The tall man frowned and said, "I won't sell anything less."

"One hundred?" Duan Yun curled his lips and asked, "Can it be cheaper?"

According to Duan Yun's memory, this kind of chip is not expensive, and it will only cost two or three yuan in later generations. Considering that this kind of chip is considered a high-tech product in this era, the price is estimated to be about one dollar, which is five or six yuan in RMB Looking at it, the kid directly offered a price of one hundred, obviously the lion opened his mouth.

"How much do you want to buy?"

"20 yuan, if I sell it, I will take it." Considering that this chip is very rare in China, Duan Yun raised the price even higher.

"Are you dreaming? There is a chip on it. Do you know what a chip is? A serious high-tech product costs at least a few hundred dollars abroad!" the tall one said loudly.

"Hahaha." Duan Yun laughed and said, "I'll give you another ten yuan, but you must tell me where you got this board, and if it works, the deal will be made."

"Not for sale!" The tall one said impatiently.

"Goodbye!" Duan Yun turned his head and left upon hearing this.

Although he really wanted the NE555 chip, he would never be taken advantage of. In his opinion, the other party offered 100 yuan just to treat this thing as a treasure, as if he had never seen the money.

After leaving the stall, Duan Yunyou walked around the alley.

This place is really a hodgepodge, there are all kinds of second-hand electronic components for sale, at least most of them are useless to Duan Yun, but it also gave Duan Yun a preliminary understanding of the folk electronic technology of this year.

After all, amateurs are amateurs. Many people just learn some simple circuit design and basic knowledge from magazines, and then make all kinds of weird gadgets, which have little practical value at all.

Perhaps for these people, they are so keen on making and displaying such gadgets that they don’t actually expect to sell them. Maybe they just want to simply communicate with other enthusiasts and get some compliments. This is also a good life pleasure.

In addition, there are some people who can really make money by relying on technology. Duan Yun saw that some of these customers came here to find experts to repair and modify electrical appliances. After the negotiation, they left their names and addresses for convenience. As for some rich young people, they came here. Buying some interesting gadgets, second-hand speakers, car lights, and all kinds of fancy and simple electronic sound and light items also sold a lot. It is indeed a very unique trading place for electronic products.

Duan Yun planned to make door-to-door sales through his own channel after making a subwoofer. After visiting here today, he found that this place is also very suitable for promoting his new products.

"Comrade, wait a minute!"

Just as Duan Yun was about to leave on his bike, someone behind him suddenly called him.

Looking back, Duan Yun found that the person who called him was the tall young man who just sold the NE555.

"What's the matter?" Duan Yun asked.

"30 yuan, take it away!" The tall young man shook the circuit board in front of Duan Yun.

Obviously, the young man didn't sell the board for a long time.

This is also a very normal thing. Although integrated chips are very rare in China these days, and it has indeed attracted many people to watch, but for amateurs like them, there are few people who know the goods, and most of them do not know this kind of chip. The principle of the chip, let alone the circuit technology designed to use this chip, coupled with the ridiculously high price, naturally cannot be sold.

"Then tell me, where did you get this circuit board?" Duan Yun asked with a smile.

"I brought it from a small village in the south," said the tall one.

Obviously, the tall one didn't want to tell Duan Yun the specific origin of this circuit board.

"That's it." Duan Yun nodded upon hearing this.

In fact, Duan Yun can guess where his circuit board came from, needless to say.

The reform and opening up entered the 80s, and after the country opened, in addition to importing a large number of urgently needed high-tech products and commodities, it also introduced a large amount of 'foreign garbage'.

The reason for doing this is because it can make up for the shortage of some raw materials for production in our country.Of course, the import of these foreign garbage is not the filthy domestic garbage as we imagined, but includes electronic products, clothing, waste paper, rubber, etc. that have been eliminated by various developed countries.

In the 90s, many old electrical appliances of foreign brands on the market flocked to China through this way of garbage import.

However, at the beginning, clothes, plastics, and waste paper and rubber were mainly imported into the country. As for waste electrical equipment, it was rare and basically came from Hong Kong. Hong Kong is a small place and cannot handle these heavy metals, which are poisonous. Material electronic products were instead sent to the mainland through some channels.

And this circuit board with the chip is mostly selected from those scrapped electronic waste.

"Thirty..." The tall one reminded Duan Yun again that he really wanted to get rid of this circuit board as soon as possible.

"Next time I have this kind of chip for me, 20 yuan a piece, I want as much as I have, and I also want other chips that can be used." Duan Yun took out three big unity cards and handed them to the tall one.

"Success!" The tall one said after taking the money.

Afterwards, the two left their names and contact information, and Duan Yun rode away with the circuit board.

(End of this chapter)