Siheyuan: Starting from a fitter

Chapter 124 Radio

Because we just informed the canteen today that there are no stir-fried dishes in the laboratory yet, so we have to go to the canteen to prepare meals.

There were no vegetables this season, only potatoes and Chinese cabbage, so Li Guocheng had a dinner of clear soup and little water.

During the whole process, Li Guocheng ate very quickly. The workers around him always pointed at him, and he knew why without even listening.It seems that the two girls are still too busy.

When I returned to the laboratory, I saw that Yan Jiefang was still busy. He walked over and took a look. He had finished the work, but he was still confirming it again and again.

"Okay, you go back, I will do the rest myself." Yan Jiefang hasn't eaten yet, so let him get off work early.

"Brother Li, I want to stay and watch you install it." Although the voice was not loud, it was very firm.It seems that he listened to what he said today.

Li Guocheng said nothing and nodded.

Yan Jiefang was overjoyed when he saw it. He quickly refilled Li Guocheng's tea cup with hot water and brought it over respectfully.

Next, the final assembly began. Because it was the second machine, Li Guocheng was very familiar with it and completed the assembly in less than half an hour.Yan Jiefang was still allowed to watch and record the whole process.

"The newly assembled multimeter has inaccurate measurement data and needs to be calibrated." Then there is another calibration process. If Yan Jiefang had not been taken care of, the calibration time would have been at least twice as fast.

Yan Jiefang held the newly assembled multimeter, and he felt as if he had participated in the entire assembly process, and he rarely wanted anything he didn't want.

"Okay, hurry up and go home. From now on, the production, assembly and research of multimeters will be left to you, and you will be fucked until you vomit," Li Guocheng teased.

"How is it possible?! I can do such a high-tech job for the rest of my life." Yan Jiefang's eyes were full of determination.

Li Guocheng did not comment, just smiled and thought to himself: "You are still young."

The next day, the two girls unexpectedly came to the first assembly laboratory early again without knowing whether to live or die.

"Zhang Zhijing, now the chip manufacturing is stuck on the photoresist, you need to speed up the progress. Zhou Xiaojuan, after we develop the chip, we will wait for your circuit board. You can be more careful," Li Guocheng said seriously.

The two girls knew that this was Li Guocheng's revenge, but they did not dare to say anything. After agreeing, the two of them left the laboratory in a low voice.

They didn't know why. They had always been very relaxed in front of Li Guocheng before, but since yesterday they learned the value of a multimeter and listened to a high-tech knowledge class about photolithography and etching.They couldn't help but deify Li Guocheng in their hearts, and subconsciously regarded him as an extremely powerful teacher.

Not to mention that so many new devices have been invented before, especially semiconductors, which are areas they don’t understand at all.They could actually participate in such a field. Their sense of accomplishment and pride made them subconsciously willing to obey Li Guocheng.

With the multimeter in hand, the next step was to design the radio. The circuit diagram and three-dimensional layout diagram had long been imprinted in his mind. After checking it again, Li Guocheng took out the epoxy resin board and started to reproduce the circuit.

The next work is very simple, inserting components, dispensing glue, welding, and wiring, all completed in less than an hour.

Having a multimeter is convenient.Previously, checking whether there was a short circuit required visual inspection one wire at a time, which was very labor-intensive.Now it's okay, use a multimeter to measure, which is more than 50 points, and it will be completed quickly.

If you want to do something good, you must first sharpen your tools. The ancients were honest and did not deceive me.

"Should we also make an oscilloscope?" Li Guocheng had already begun to let himself go. Forget it, that is too complicated and the conditions are not yet met.

Install the battery, turn on the switch, turn the knob to adjust the channel, and soon the song "Red Plum Praise" came out of the speaker. The background noise was a bit loud, and there was a rustling sound in the song.

The receiving circuit is very simple, with only a transformer and an adjustable capacitor, and generally does not introduce noise.Disconnect the receiving circuit, directly divide the voltage with a resistor, and input a weak voltage to the buffer circuit.

Set the multimeter to the DC range and measure level by level. As long as fluctuations are found, adjust the parameters until satisfactory stability is achieved. There is no drift in the three-level amplification circuit.

After reconnecting the receiving circuit, turning on the switch, and adjusting the channel, the song actually changed to "Return from Target Shooting." Li Guocheng felt carefully that the sound was very clear and the restoration was very good.

The sound of songs coming from the laboratory attracted the two girls. Yan Jiefang had been dumbfounded for a long time, but he was watching the whole process. Looking at Li Guocheng's movements with ease, Yan Jiefang was completely numb. "God, please take off my knees," he kept shouting in his heart.

The two girls behaved this time and did not dare to touch the radio. They just gathered around the table and listened to the music quietly.

Today's radios are completely exposed, with circuit boards, knobs and speakers randomly thrown on the table. In Li Guocheng's eyes, they are really ugly.

But as three people of this era, this was the first time they saw the internal structure of a radio. It was a bunch of extremely ugly components. In their eyes, it was so charming that they wanted to reach out and touch it.

Seeing their enthusiasm, Li Guocheng smiled and said, "This is the tuning knob, this is the tuning knob, be careful not to touch the circuit board."

Hearing Li Guocheng's voice, the three of them immediately started playing, but they were all cautious and did not dare to use too much force for fear of damaging the radio.

At this time, Li Guocheng started carving the radio casing again, using ordinary elm wood from the laboratory.

However, with Li Guocheng's later vision and carving skills, after polishing, even if it is not painted, the entire appearance makes people feel high-end, grand and classy at a glance.Compared with the radios on the market today, the difference between a lady and a beggar is simply there.

Interrupting their playfulness, Li Guocheng assembled the radio under the surprised eyes of the three.Looking at it now, it is completely a work of art.Even Li Guocheng, the instigator, was full of praise.

Li Guocheng handed it to the three people, and they waved their hands repeatedly, not daring to play with the assembled radio anymore.

Their performance gave Li Guocheng the greatest satisfaction for his vanity.At Li Guocheng's insistence, they actually washed their hands with soap before picking up the radio and playing with it.

They still don’t know that this radio was later given to the leaders of friendly countries as a state guest gift.

It’s hard to find one on the market, not because of how advanced the circuitry is, but because of its appearance, modern aesthetic design and Li Guocheng’s master carving, making this radio a legend.

In order not to affect Li Guocheng's research and development work, less than 100 radios of this type are produced every year.

Li Guocheng also did not expect that he was first sought after by everyone not for his semiconductor technology, but for his engraving skills. This made Li Guocheng dumbfounded.

Of course, the biggest reason is Mr. Zhao's protection of Li Guocheng, which has resulted in only a few people knowing about Li Guocheng's semiconductor technology capabilities.

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(End of this chapter)