Chapter 346 Making Circuit Boards

The university course has started. At the beginning, it still laid the foundation. The content is not challenging for Lin Hong at all. He has mastered this knowledge for a long time.

The content related to computers is just a basic introduction to computers. It is roughly to talk about the history and basic principles of computers, such as what is binary and what is hexadecimal.

The design of this kind of course is prepared for people like Wu Dong. First of all, it is to assume that the students know nothing about it, and then the teacher teaches it step by step according to the textbook.

But for Lin Hong, a student who has fully mastered the contents, or only takes less than an hour to turn over the content of the whole book, it is a waste of time to do so.

It has to be said that such an introductory tutorial has to study for a semester.

After Lin Hong took two classes, he immediately disappeared from the class. He felt that it was an unforgivable mistake for him to waste time like this.

The quadrangle courtyard has been rented by him. Professor Yan is a very talkative person, at least in Lin Hong's opinion. In order to let Lin Hong pay less intermediary fees, the rent was directly reduced by half.

Lin Hong has been busy setting up the laboratory for the past two days.

He removed the laboratory at home, asked Pan Pan to go back, packed the equipment for him directly, and sent it to this side.

Many of those devices can't be purchased in China, otherwise it won't be so troublesome.

Lin Hong ran almost the entire mechanical, electrical and equipment market in North J City before finally forming the prototype of the laboratory.

He did some research on the metal card set when he was in the military training base, but due to the restrictions, he could only see the fur. This time, he decided to copy the metal card in proportion to make a model that was enlarged by 10 times.

The reason for this possibility is that, on the one hand, Lin Hong has in-depth research on this area and is familiar with the unconventional functions of these circuits. On the other hand, it is because the components used in the metal brand do not have a special model, and they all use are all things that can be found on the market.

The most shocking thing about the basic circuits involved in energy field technology is that the things used are things that existed a hundred years ago, such as ordinary resistors, capacitors and coils. The basic technology used in the production of energy sites is also derived from electric and magnetic fields, the most critical of which is frequency.

The metal plate is actually a miniature circuit board producer who uses a technology similar to a chip to characterize the circuit diagram on a small metal plate. Although the circuit is small, it can be studied with tools such as a magnifying glass or microscope.

Lin Hong specially bought an electron microscope eliminated from colleges and universities from the second-hand market of experimental equipment, scanned the fine circuit on the metal plate, and finally restored it.

It seems to be a small brand, but the circuit on it is quite complicated. After Lin Hong scanned the circuit, he studied it for a long time and failed to understand the principle for a while.

He roughly divided the circuit, mainly including the receiving circuit and the excitation circuit.

The receiving circuit is a structure that receives the energy released by the charger. This part of the structure is somewhat similar to the principle of the radio, but compared with the radio receiving radio audio signals, it receives vibration energy, and it can convert and store the received vibration energy.

The

excitation circuit is the generating circuit of the energy field. After having energy, this part of the circuit will be excited.

After Lin Hong's analysis, there is a very important cyclic gain structure, which can make the subtle energy vibration oscillate back and forth in it. For each shock, its strength can be increased so that after many cycles, it can reach the ideal state.

After all, this is a fist product that has been studied by many people for a long time. Lin Hong can't fully understand it for a while, but he was inspired by the cyclic oscillation circuit, so he designed the drawings of the superbrain timing signal generator.

The drawing is drawn, and the next step is to find a way to make it.

This signal generator is relatively complicated. It is not as complicated as before. Just find a scrapped copper plate and then weld some components on it. Instead, you need to make the circuit diagram on the board first.

Because it was only a sample, it was not easy for Lin Hong to give it directly to the manufacturer to print the board, so he had to do it himself.

There is no way to make PCB boards by yourself. In fact, many radio enthusiasts have had such an experience. Sometimes they have designed a circuit by themselves. If they want to realize it, they have to make it by themselves. Some masters even used this method to make quite complex power and discharge circuits. The road. There are many ways to make PCB boards, such as knife engraving, photosensitive plate, thermal transfer printing, screen printing, etc.

Lin Hong decided to use the simplest knife engraving method. After all, other methods require certain equipment. For example, thermal transfer printing requires a printer, and screen printing requires professional equipment.

Lin Hong went to the material market and bought what he needed, mainly copper plates, carving knives, electric drills and other small things.

Copper-coated plate is a copper foil laminate, which is a resin plate covered with copper foil on the surface. There are single-sided copper-coated plate and double-sided. This kind of board is the basic material of the circuit board, so it is also called the substrate. It is usually light yellow, with many copper foil circuits and some holes for welding components.

Lin Hong re-planned the circuit diagram and turned all the curves into straight lines, and these lines should not be crossed as much as possible and reasonably distributed within a certain size. If the lines are crossed, it means that the design is not very scientific, because after it is made, this part cannot be directly connected with copper foil, and the two parts must be bridged with a jumper, which is not only not beautiful, but also has many more processes.

Lin Hong cut the copper plate according to the size of the design drawing, turned one side of the copper plate up, then covered it with a copy paper, covered the drawn circuit diagram on the copy paper, and finally repainted it on the paper according to the circuit diagram with a ballpoint pen. In this way, the line is displayed on the copper plate. Go up.

If there is a printer or thermal transfer equipment, this step will not be so troublesome.

Fortunately, Lin Hong's painting technology and muscle control ability are very good, and the things he draws are not much different from the printing.

Next, use a carving knife to carve.

This part is a test of eyesight and technology. Use a carving knife to cut the copper foil around the circuit diagram little by little, and ensure that the line and the line must be disconnected, otherwise it is likely to cause a short circuit.

The work of this step is the most complicated. Generally, the knife carving skills of beginners are not at home. In the process of engraving, it is easy to walk the knife. As long as there is a place where you can accidentally make a mistake, the whole board may be scrapped. Therefore, under normal circumstances, the knife engraving method to make PCB boards is used to make some relatively simple circuit diagrams.

Lin Hong's control of the force has reached a very amazing level, but it is not difficult for him to engrave something. Basically, he succeeded in this process at one time, and there was no mistake.

After successful engraving, the prototype of the circuit board has been basically formed. Next, Lin Hong began to punch holes in the originally designed place.

These holes are reserved for the components. After all, the function of the circuit diagram is only equivalent to a wire, and its purpose is to connect the components. Regardless of the size and beauty of things, you can directly use wires instead of copper foil circuits, but the things made like that may not look good, and the wires are staggered and messy.

The last process is to polish the copper foil with sandpaper, and then apply a layer of rosin alcohol water to the copper foil. This has two advantages. One is to prevent oxidation, and the other is to help to solder later.

At this point, the circuit board has been made.

Lin Hong picked up the board and carefully checked it twice, and compared it with the original drawing repeatedly to prevent himself from making a mistake in the circuit diagram in the process of characterization.

After checking, it was found that he really made a mistake in two places. It should have been connected, but he crossed out the copper foil.

Lin Hong didn't bother to re-engrave it. Anyway, it was just a sample. He punched holes at the two breakpoints, and then welded them with enameled wire, forming two jumpers on the board.

Lin Hong wanted to continue welding components, but he suddenly remembered an important problem. In this circuit diagram, there are two integrated blocks and some tripod components, but he did not pay attention to this when drawing the circuit diagram. In this way, the punching direction of the circuit diagram he portrayed is completely contrary to the actual one.

Because Lin Hong drew the layout of the circuit, the corresponding hole should be completely opposite to the pin of the component, and Lin Hong did not notice this before.

It seems that there is still a lack of experience! Lin Hong sighed.

This problem is really difficult to find if you don't do it yourself. The drawings may be understood, but when you really do it, it's a different matter.

It seems that you can't steal it even if you want to be lazy. Those triangular vitality parts may be able to make do with it and twist it for welding, but what about the integrated block? Not only are the pins relatively short, but the number of pins is more than four, which is impossible to make do with it.

There was nothing he could do. Lin Hong had to adjust the circuit diagram, cut the copper plate again, re-draw it, and then portray it.

This time, there was finally no problem, and he successfully welded all the components.