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Jul 25, 2019, 08:12 AM
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6 good ways to make boards


Personal production circuit board method one:


1. Cut the copper plate into the dimensions required for the circuit diagram.



2. Place the wax paper on the steel plate, engrave the circuit diagram on the 1:1 wax paper with a pen, and cut the circuit diagram engraved on the wax paper according to the board size. The cut wax paper was placed on a printed copper plate. Take a small amount of paint and talcum powder and mix them into a thick, suitable print. Use a brush to pick up the print and apply it evenly over the wax paper. Repeat the board several times to print the circuit. This stereotype can be reused for small batch production.

3. An etching solution was prepared in which the ratio of potassium chlorate to 15 ml of 15% hydrochloric acid was 1%, and etching was performed on the plate to be etched.

4. Rinse the etched printed circuit board repeatedly with water. Wipe off the paint with banana water and wash several times to clean the printed circuit board without leaving a corrosive solution. Apply a layer of rosin solution for drying and drilling.



Personal production circuit board method two:


There are many ways to make printed circuit boards in amateur conditions, but this is not time consuming, or the "process" is complex or of poor quality. The method of making a printed circuit board is one of the better overall effects, as follows:

1. Plate layout. The pads in the figure are indicated by dots, and the wires can be connected to a single wire, but the position and size need to be accurate.

2. According to the size of the board, cut the board and clean the surface of the copper foil.

3. Use carbon paper to copy the image onto the plate. This step can be omitted if the production line is simple and the manufacturer has some experience in manufacturing the board.

4. Paste the standard pre-cut symbols (pads) of different inner and outer diameters according to the actual condition of the parts; then, according to the current, paste the tape lines of different widths. For standard pre-cut symbols and tapes, you can use the electronics store. The general specifications of the pre-cut symbols are D373 (0D-2.79, ID-0.79), D266 (0D-2.00, ID-0.80), D237 (OD-3.50, ID-1.50), and the like. It is best to buy paper - the base material. (Black), plastic (red) materials should not be used as much as possible. Common specifications for tapes are 0.3, 0.9, 1.8, 2.3, 3.7, etc. The units are all in millimeters.





5. Use a soft rubber, plastic and other soft hammer to strike the map so that it is completely adhered to the copper foil. Focus on corners and lap joints. When it is cold, it is best to heat the surface with a heater to enhance adhesion.

6. Ferric chloride corrosion, but note that the liquid temperature is not higher than 40 degrees. After the corrosion is completed, it should be taken out and rinsed in time, especially if there are thin wires.

7. Drill your eyes, illuminate the copper foil with fine sandpaper, apply a rosin alcohol solution, and then dry. The quality of the printed circuit board is very close to the quality of a conventional printed circuit board. A 0.3 mm tape can be passed between the two legs of the IC, which greatly reduces the short jumper on the front of the board, saving time and saving time.



Personal production circuit board method three:


Put a piece of paint (ie shellac, available at the chemical raw material store), dissolve it in three parts of absolute alcohol, stir it properly, and after it is completely dissolved, add a few drops of medical purple syrup (gentian violet) to make it With a certain color, after mixing evenly, it can be used as a protective paint to depict the circuit board.

First polish the copper plate with fine sandpaper and then use a duck-billed pen (or an ink duck pen for drawing graphics on the compass) in the plotter. The duckbill pen has a nut to adjust the thickness of the stroke, and the stroke thickness is adjustable, and a fine line can be drawn with a ruler and a triangular ruler. The drawn lines are smooth and uniform, without edge serrations, giving a smooth and smooth flow. At the same time, you can also write Chinese characters, English, pinyin or symbols in the free space of the board.

If the drawn line is soaked, the concentration is too small, you can add a little paint; if you can't open the pen, it's too thick, you need to drop a few drops of absolute alcohol. If it is wrong, it doesn't matter. Just use a small stick (matchstick), make a small cotton swab, gently wipe with a little alcohol, and then redraw it. After the board is drawn, it may corrode in the ferric chloride solution. After the board is corroded, painting is very convenient. Rub the alcohol with a cotton ball and wipe off the protective paint. After drying, you can use pine perfume.

Due to the rapid evaporation of the alcohol, the prepared protective coating should be sealed in a small bottle (such as an ink bottle). Don't forget to cover the bottle after use. If it is used next time, the concentration will become thicker, just add the right amount. Anhydrous alcohol can be used.



Personal production circuit board method four:


The tape is applied to the copper foil of the copper plate, and then the circuit is drawn on the plywood, then the plywood is engraved with a knife to form the desired circuit, and the non-circuit portion is removed, and finally the corrosion or current is treated with ferric chloride. Electrolysis can produce the ideal board.

The corrosion temperature can be carried out at about 55 C and the corrosion rate is faster. Rinse the cleaned circuit board with clean water, remove sticky notes from the circuit, punch holes, and wipe the rosin alcohol solution for use.





Personal production circuit board method five:


1. According to the shape of the components used in the schematic and the dimensions of the printed board area, the density of the components and the position of each component are reasonably arranged. The position of the component should be determined according to the principle of the first large, small, first, and then partial, so that adjacent components in the circuit are placed close to each other, neat and uniform.

2. The connecting line between the components cannot be rotated at a right angle at the intersection of the corner and the two lines. They must be curved, not crossing each other and returning too far. When some wires are not able to do this, it is conceivable to print the wires on the back side of the printed circuit board and then connect them to the front side circuit via pins or to connect them to the insulated wires during soldering. Component.

3. The distance between the input and output sections is best to avoid mutual interference.



Personal production circuit board method six:


Radio enthusiasts are troubled by making circuit boards. Now I will introduce a "sub-printing" method for making printed circuit boards. Methods as below:

1. Print the cardboard on the printer at a ratio of 1:1 on 80 grams of copy paper. It can be drawn by hand, but the bottom paper should be flat.

2. Find a fax machine, take out the fax paper in the machine, and replace it with a hot melt film (provided by the company). Place the circuit diagram at the entrance of the fax machine and copy the circuit diagram to the hot melt film using the copy button of the fax machine. At this point, the "printed original" of the printed circuit board is ready.

3. Use a double-sided tape to flatten the plastic film on the copper plate. Pay attention to the flatness, not wrinkle, the tape paper can not cover the melted part, otherwise it will affect the production effect of the circuit board.

4. Apply the paint evenly to the plastic film with a paint brush. Note: You can't often brush, you can only brush in one direction, otherwise the plastic film will wrinkle and the lines on the copper plate will overlap. After the circuit diagram is completely brushed, carefully remove the plastic film. The printed circuit board is printed at this time. After drying, it may be corroded.

If you want to print multiple pieces, you can make a wooden frame that is slightly larger than the board, and lay the wire mesh (the company has wire mesh) flat on the wooden frame and fix it. Then use double-sided tape to paste the film to the bottom of the screen. Place the CCL on the table, close the wire mesh frame (print image and copper clad plate should be aligned left and right), brush in one direction with a paint brush, and then remove the frame. The printed circuit board is printed. If it is defective, it can be modified with paint and bamboo.

The above process must be noted that when painting, the hand should be light and heavy, the paint film is too thick and too thick, the lines will run lace, and the too bright lines will break. The plastic film must face up.
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