Just as the people of the whole country were immersed in the joy of the festival, Duan Yun started the work of the new year early.

By the afternoon of the second day of the Lunar New Year, Duan Yun had already begun to work in the factory.

In the past few days, whether it is a labor service company or an electronics factory, there are a small number of workers on duty, and Duan Yun's management has been relatively relaxed these days, just going to the workshop every day to take a look, and then settling down at noon The master of the canteen makes more hard dishes such as chicken, duck and fish, and all the meals are free these days, and the account is all counted on Duan Yun's head.

In the past two days, Duan Yun has mainly walked around the new house of the electronics factory, checked the ventilation of the room, and asked the workers to clean and clean it every day, and arranged the exhibition hall in advance, and placed all the speaker products in the factory neatly, in addition, Duan Yun also used his own photos to decorate the enlarged photos, and the whole exhibition hall looks very atmospheric and beautiful.

As for the audition room, Duan Yun placed a highest-end subwoofer speaker in the factory in the 4 corners of the house, and in the middle are three rows of high-end leather sofas, and the internal lighting is also set up according to the stage of the workers' club, Duan Yun also specially designed a circuit board, which can automatically adjust the flashing of the lights according to the audio, and it took two days to arrange the electrician to install and debug, and the effect also made Duan Yun very satisfied, especially when playing rock music, the lighting effect is very dreamy, and it is easy to make people feel excited and shocked when they are in it.

In fact, Duan Yun has always wanted to install Led light displays on the four walls of his audition room, so that the rhythm and melody of music can appear on the display screen in a wave-like shape, just like the wave screen display of music software on computers in later generations, but there is no such thing in this era, so it is impossible.

However, although it is impossible to buy a ready-made LED screen, Duan Yun can still make a reduced version of the display screen through other means.

During the Chinese New Year, there were no production orders in the factory, so dozens of workers were transferred from the workshop to make this simple version of the LED display.

The LED lamp in the market is a semiconductor material chip that emits light on TV, fixed on the bracket with silver glue or white glue, and then connected the chip and circuit board with silver wire or gold wire, 4 weeks with epoxy, quality sealing, play a role in protecting the internal chip, and finally install the shell, the shock resistance of this LED lamp is very good.

Duan Yun can't buy this kind of semiconductor light-emitting material, but he can replace it with a large number of small light bulbs for teaching physics experiments, which are the kind of small bulbs used for flashlights, which are only the size of a little thumb.

Compared with light-emitting diodes, this kind of small bulb consumes more power, and the durability is also poor, and it is easy to burn out the filament when it flashes frequently for a long time, but if it is just a time to listen to a few songs, it is still possible to use this small bulb as a dot matrix display.

In addition, the LED display in the market is driven by a single-chip microcomputer, and Duan Yun has a few second-hand 8088 chips on hand, and there are many ne55 chips, which can be used to make a simple version of the LED display.

Duan Yun asked people to make 80 smooth and smooth wooden boards, each wooden board was neatly and densely installed with 100 small light bulbs, and 80 wooden boards used a full 8,000 small light bulbs, the area just covered the entire front row of the test room and the middle part of the two walls, which looked very spectacular.

The single-chip microcomputer program used for control is written by Duan Yun himself, this kind of small program is not complicated, and Duan Yun can easily write it.

Its principle is to regard the volume as an equalizer in a music system, in the equalizer, you can see the jump of the LED according to the music, if the music volume is too large, the equalizer will reach the peak, and the volume is too low to reach the trough, with the help of microphones, op amps and voltage comparators, let the Led shine under the change of volume, if the volume is too large, multiple LED lights will sound, if the volume is too low, there are individual LED lights up The volume meter can also be used as a volume detection device.

Among them, the condenser MAC or microphone is a sound induction transducer that can convert sound energy into electrical energy, so the sensor designed by Duan Yun can change the voltage with sound.

The principle of this circuit is still very simple, first of all, the microphone picks up the sound signal and converts it into a level signal with a linear relationship with the sound intensity, so the high volume has a high level, and the low volume will generate a low level, and then the voltage signal filters out the noise through the high-pass filter, and after the signal is filtered, it is amplified by the amplifier, and finally the number of LED lights that can be measured by the sound volume is determined, that is, the number of small bulbs that can be lit.

In the past few days of the Chinese New Year, Duan Yun has been soaking in the workshop every day, organizing workers to install and test this dot matrix light screen, and installing these matrix boards on the wall of the sound room.

After everything was assembled, Duan Yun sat alone on the soft sofa in the audition room, and there was a modified classical record player on the table in front of him, and the thick curtains were drawn, and the room was instantly dark, but at the moment when the beautiful melody sounded, the light matrix on both sides of the wall lit up with the rhythm, and the blue bright stars made Duan Yun feel like he was drifting in a boundless blue ocean, which looked very moving and dreamy.

And when Duan Yun changed to a rock music, the red light matrix in front of him began to move with a strong and bright rhythm, like a blazing flame, and the speakers placed in the 4 corners have a strong three-dimensional feeling, which makes people feel like they are in the rock music scene.

For four days in a row, Duan Yun soaked in this audition room every day, organized dozens of skilled workers, and made many improvements to the interior decoration here.

Duan Yun's aesthetics were greatly influenced by later generations, and in his opinion, the layout of the exhibition hall is also quite important, because this is the first stop for merchants to visit the products, and if the products can leave a deep and strong first impression on these merchants, then it will be relatively easy to get orders.

High-quality and low-cost goods are what every businessman likes, and before the product is officially fed back from the market, the grade of the product is actually packaged.

Duan Yun's exhibition hall is very elegantly furnished, and there are even some classical decorations inside, such as the statue of Venus with a broken arm, a copy of the Mona Lisa, and some other imitations of famous European and American paintings in the civilized world.

Duan Yun just wants to raise the style of his speaker packaging, and when people enter the exhibition hall as much as possible, they will soon be able to associate these subwoofer speakers with the words "classical", "Europe and the United States" and "artwork", which also conforms to the yearning and respect of the Chinese people for the culture of developed countries in Europe and the United States in this era......