"Sure, I have everything here, is there anything else you need?"
"Do you have a universal board?"
"Yes, how much do you want?"
"Ten sheets, and please bring me some commonly used resistors and capacitors. Do you have the soldering iron, solder, and rosin?"
Du Chen thought about what he needed and asked the other party.
"We have both. How many do you want?"
"One soldering iron per person, two rolls of solder will be enough, and two boxes of rosin. By the way, do you have any amplifier chips?"
Du Chen suddenly thought that the accessories for tube amplifiers were incomplete, and he still had to study tube amplifiers, so he decided to make a transistor amplifier first. It would also be nice to have a set of audio equipment at home, which would be convenient for watching TV and listening to music during the New Year and other holidays.
"No problem. What model of amplifier chip do you want?"
"Take it out and let me see if there's anything I like."
Du Chen actually didn't know what power amplifier chips were available, so he asked the other party to take them out and see if there was any power amplifier chip he knew of.
The young man didn't say anything after hearing this, and directly took out a component box. Du Chen opened it and took a look. He didn't recognize many of the power amplifier chips, and there was no internet to check the specific parameters, so Du Chen was a little confused.
Du Chen gritted his teeth and continued flipping through the pages, when suddenly an amplifier came into his sight.
"TDA7294! How much is this?"
When he was surfing the Internet before his rebirth, Du Chen had seen many discussions and reviews of TDA7294 by audiophiles. Some said it was good, some said it was average, but Du Chen was too busy to try it. Now he finally came across one that he knew about, so Du Chen decided to buy it and give it a try.
"This one? This one is more expensive!"
When the young man saw TDA7294, he grinned and thought, "This classmate is very good at choosing. Basically, this amplifier in this box is one of the most expensive."
"How much is it?"
Du Chen also understood that the current price of transistors would definitely not be cheap, and that this chip would still be used by people in 20 or 30 years, which showed the value of this power amplifier chip, so Du Chen expected the price to be a bit higher.
"One hundred and twenty!"
"What?"
Before Du Chen could say anything, Du Bin and the others beside him were dumbfounded. Just a small rectangular box, and it cost 120? This is a scam!
"Do you have any?"
Du Chen's reaction made them even more puzzled. He actually asked if they had any. Didn't Du Chen just want to buy one? Didn't Du Chen think this little thing was expensive?
"I have five pieces here. How many do you want?"
The young man asked Du Chen in surprise. He initially thought that Du Chen would be scared by the price. After all, who would buy this thing for more than a hundred yuan unless they were an enthusiast?
"Give me those two. Oh, and do you have the technical specifications for this amplifier?"
Du Chen quickly asked the other party. Without any technical parameters, the black man knew how to connect it after a glance.
"Yes! Wait a minute, I'll look for it!"
The young man turned around and went to look for information on the table, while Du Bin pulled Du Chen.
"Chenchen, what's the use of this thing? Just say you need it and buy one, right? Why buy two? Let your parents know and they'll beat you up!"
"Brother, this is called an amplifier chip, and it's delicate and easily breaks. Buy an extra one as a spare part!"
Du Chen explained to Du Bin. Before Du Bin could say anything else, the young man had already handed the technical parameters to Du Chen.
Du Chen opened it and looked at the circuit diagram, then said to the young man.
"Boss, please prepare all the other components shown in the circuit diagram for me. They must be of good quality, especially the capacitors and power supplies!"
Du Chen was no novice either. He knew the importance of accessories to the finished product, so he directly reminded the other party to make sure the quality was good, otherwise the amplifier chip would be wasted.
"No problem, classmate, you're quite professional!"
The young man also complimented Du Chen. After all, the price of today's order was not low, so he should say a few nice words.
"It's just a hobby, Boss, please take out all the accessories I just mentioned and assemble them for me!"
"No problem, just wait a moment!"
The young man was talking without stopping his hands. He took out a plastic bag and packed it for Du Chen. Du Chen watched carefully from the side. After all, this stuff was quite watery. Not to mention getting ripped off, the things made from it would make you question your life.
The real rip-off is when the accessories are ripped off. You won't doubt the item you just bought, you'll only doubt your own technical skills. Then, after a long inspection, you realize it's the accessories that are faulty! That's when you realize how frustrating it is to be ripped off!
"Classmate, would you like to take another look?"
After the young man packed all the accessories, he handed the plastic bag to Du Chen.
"No need, just count the money!"
Du Chen had just looked at it carefully, so he asked the other party to settle the account directly.
"OK!"
The young man took the calculator and added the items one by one. After a while, he calculated the amount of money.
"Classmate, the total is five hundred and forty-two."
The young man said to Du Chen.
Du Chen calculated silently in his mind: two amplifiers for two hundred and forty, five soldering irons for sixty, of which his was a thermostatic soldering iron with twenty-one thermostats, solder wire for twenty, three pieces of rosin, resistors, capacitors and other miscellaneous small parts for twenty, two single-tube radios for twenty-four, two three-tube radios for seventy, six books for one hundred and five, which added up to exactly five hundred and forty-two.
"hiss……"
Before Du Chen could say anything, the people around him gasped. More than 500 yuan was gone in just a short while?
"Boss, give me a discount!"
Du Chen directly told the other party that the profit from electronic components was not high, but the profit from other things was not small.
"Well, I'll give you a zero, five hundred and four!"
"Five hundred and two!"
Seeing Du Chen's unquestionable expression, and for the sake of the future, the young man nodded.
After leaving the stall, Du Bin couldn't help but ask Du Chen.
"Chenchen, aren't you afraid of getting scolded for spending so much money at once?"
"Du Chen, Zhao Pengfei and I will give you the money!"
As he said that, Li Qiang was about to hand the money to Du Chen.
"No need, you guys keep it, let's go for another walk?"
Du Chen asked Du Bin and his friends.
"Chenchen, let's go back and make a radio! I want to try making a radio now."
Ding Miaomiao said on the side that she was mainly scared by the way Du Chen spent money. If she went for another walk, Du Chen might not spend much money.
"Then let's go, Zhao Pengfei, Li Qiang, you two come together, I'll teach you later!"
The radio set he bought came with a circuit diagram. For Du Chen, a single-tube radio would just need eyes, right?
A few of them took the bus back to the eyewear store and found that the door was open and Ren Suyun and Gu Yue were disturbing the hygiene.
"Auntie San, Sister Yueyue, you guys are here!"
Du Chen quickly greeted him.
"Chenchen, where did you go so early in the morning?"
"Aunt, we went to the Drum Tower to buy some electronic components and books. We're going to make a radio later."
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