After the family of three had dinner at noon, Duan Yun rode his new car and continued to start repairing electrical appliances at home.

In order to establish his long-term customer base, Duan Yun wrote a stack of 'business cards' by himself, leaving his name, workshop and home address on it.

Telephones can't be bought with money in this era, they are only available in factories, and it is difficult to get into the sky if you want to root a telephone line for your home, and Duan Yun is also helpless to do this.

With these business cards, it will be much more convenient for these customers to find themselves or introduce their business to themselves in the future, after all, they are all from a factory, and with this 'business card', it is very convenient to find Duan Yun.

Originally, Duan Yun planned to imitate the method of 'urban psoriasis' in his previous life, and put small advertisements on the telephone poles at the entrance of the corridors in all residential areas, which would undoubtedly attract more business.

But after Duan Yun finally thought about it, he still gave up this plan.

You must know that the state has cracked down on speculation very strictly in recent years, even if Duan Yun is repairing electrical appliances, but once this business is done too much, it will definitely attract the attention of some local departments, and if it is not done well, it will become the target of economic crimes, which is completely possible.

After all, it is normal for workers to help each other collect some hardship fees in the past two years, and no one will put this kind of thing online, so the risk is naturally much smaller.

For a whole afternoon, Duan Yun rode his newly bought car to nearly twenty households, and there were more than 100 yuan in his pocket.

Duan Yun earned the wages of ordinary workers for several months in one day, which made him feel unreal.

It is said that it is difficult to make money these days, but now in Duan Yun's opinion, it is obvious that those who have this kind of sigh are the working class back then, and for many traders and people with special skills like him, the way to make money is still quite wide.

After going home for dinner in the evening, there was no other entertainment, and Duan Yun came to the rental house alone.

When the weather was a little hot in August, and there were a lot of mosquitoes and flies in the rental house, Duan Yun simply pulled out all the weeds around the house, and then went back to the house and folded a small fan with waste paper to drive away mosquitoes and flies and enjoy the coolness.

Duan Yun sat on a stool and carefully modified the circuit diagram of the antenna amplifier, looking very focused.

People who are engaged in technology like to drill some horns, and Duan Yun is obviously no exception.

In fact, the TV antenna amplifier he designed was already very advanced in this year, but Duan Yun still wanted to make a more avant-garde design.

Duan Yun clearly remembers that when he was a child in his previous life, there was a TV antenna called '001' that was very popular, and the advertisements for this antenna were very fierce, and even its function was also superb.

But in any case,001The performance of the antenna at that time was indeed commendable,The sales were also very hot,Especially when the TV has begun to be popularized in a large area across the country,Even color TVs are no longer rare,001The use of antennas is quite large。

In addition, this antenna has the advantage of being small in shape, and it can be used on the top of the TV, compared to those set up in the roof yard, it is difficult to adjust the signal, and the outdoor antenna that cannot be used in wind and rain is obviously a lot more convenient, and the signal for viewing is also very good.

However, 001 This kind of antenna is an active antenna, and the signal receiving and processing components are far more complex than the signal amplifier of the current Yagi antenna, and some electronic components Duan Yun may not be able to buy them in Daxing, so he is only out of a preliminary design stage now, and he still has to find a way to promote the improved Yagi antenna designed before.

Duan Yun even has plans to set up his own factory to produce this new indoor antenna in the future, but now Duan Yun can only think about it.

If you are in the countryside, you can rely on the village branch brigade to set up a village-run collective enterprise, but the approval is still very difficult, and the capital, land and talent are huge challenges.

Although Duan Yun has technology, the money he earns now is still too far from setting up a factory, and there is no connection on the government side, so he can only temporarily engage in his electrical maintenance business during this time.

Duan Yun repeatedly revised the drawings, and he tried his best to make the circuit diagram of the antenna amplifier smaller on the premise of improving performance, so that the amplifier circuit board would save costs and be small and flexible.

He painted until late and felt his eyelids fighting, so Duan Yun left the rental room and went home to sleep.

......

Early the next morning, Duan Yun rode his bicycle into the city.

Although it was Monday, because the workshop did not change shifts for him, Duan Yun could still do his own things during the day.

In fact, Hongxing Gear Factory is located on the edge of the suburbs, not too far from the center of Daxing, it takes more than an hour to walk, and with a bicycle, it takes less than 20 minutes to pass.

Came to the place agreed with Li Caitou yesterday, handed over the money with one hand and delivered the goods with the other, and when he left, Li Caitou also stuffed him with the remaining half of the big front door, obviously treating him as an important customer.

After walking around the mall, Duan Yun bought some other things for electrical repairs, and then rode back to the factory.

Pushing the car into the small room, Duan Yun put the copper clad laminate and other things he bought, and then prepared to make the part of the antenna amplifier.

Although the circuit board seems to the layman to be very complex and can only be produced in a factory, in fact, as long as the tools are ready, it is completely possible to DIY it yourself.

First draw the line to be done on white paper, then print it on the copper-clad surface with carbon paper, apply the paint to the lines and solder joints to be retained with a small row of pens, put it in a plastic tray after cooling, pour it into the circuit board with warm water to soak it in, and shake it gently until the exposed copper-clad surface is corroded.

Then wash and soak with water and cool dry, wash off the patent leather with rubber water, punch holes in the welding holes with a small electric drill, polish the line with very fine sandpaper, and finally brush the line with rosin alcohol mixture, and it will be done after cooling.

Looking at the first circuit board he made after being reborn, Duan Yun was still quite excited.

Subsequently, Duan Yun added a layer of 'anti-piracy' device to this circuit board, and then used scissors to make a simple shell from the purchased white iron sheet, and after welding it with the antenna line, it was done!

Taking a closer look at the finished product, Duan Yun felt a great sense of accomplishment in his heart, after all, this was a work that he had spent a lot of effort to complete independently.

Glancing at the watch on my wrist, it was just lunchtime, and there were few TV programs at this time.

Duan Yun planned to go home to eat and sleep first, and then wait for six or seven o'clock in the evening to go to the home of the middle-aged woman in the third living area last time to test the new Yagi antenna he had just made......