Introduction of DIY circuit board method (Part 1)
method 1:
1. Cut the copper-clad board to the size required for the circuit diagram.
2. Place the wax paper on the steel plate, use a pen to engrave the circuit diagram on the wax paper at 1: 1, and cut the circuit diagram engraved on the wax paper according to the circuit board size, and place the cut wax paper on the printed copper board. Take a small amount of paint and talc powder to make a thick and suitable printing material. Dip the printing material with a brush and apply it evenly to the wax paper. Repeat several times to print the circuit board. This stereotype can be used repeatedly, suitable for small batch production.
3. Prepare a corrosive solution with a ratio of 1 g of potassium chlorate and 40 ml of hydrochloric acid with a concentration of 15%, and wipe it on the circuit board to be corroded for corrosion.
4. Wash the corroded printed board repeatedly with water. Wipe off the paint with banana water and wash it a few times to make the printed board clean without leaving corrosive liquid. Spread a layer of rosin solution to dry it and drill holes.
Method 2:
Dissolve one part of the varnish (that is, shellac, available in chemical raw material stores) in three parts of absolute alcohol, and stir it properly. After all of it is dissolved, add a few drops of medical purple potion (gentian violet) to make it Appears a certain color, after mixing evenly, it can be used as a protective paint to describe the circuit board.
First polish the copper plate with fine sandpaper, and then use the duckbill pen in the drawing instrument (or the ink duckbill pen used to draw graphics on the compass) to draw. The duckbill pen has a nut to adjust the thickness of the stroke, the thickness of the stroke Adjustable, and can draw straight lines and triangle rules to draw very thin straight lines, and the lines drawn are smooth and uniform, without edge serrations, giving a smooth and fluent feeling; at the same time, it can also be used in the free space of the circuit board Write lines drawn in Chinese characters, English, pinyin or symbols. If it soaks around, the concentration is too small, you can add a little paint; if you ca n’t drag the pen, it is too thick, and you need to add a few drops of anhydrous alcohol . It doesn't matter if the description is wrong, just use a small stick (matchstick), make a small cotton swab, dipped in a little absolute alcohol, you can easily wipe off, and then re-paint. Once the circuit board is drawn, it can be corroded in the ferric chloride solution. After the circuit board is well corroded, it is also very convenient to remove the paint. You can wipe off the protective paint with a cotton ball dipped in anhydrous alcohol. After a little drying, you can apply it with loose perfume. Due to the rapid evaporation of alcohol, the prepared protective paint should be placed in a small bottle (such as an ink bottle) and sealed. After use, do n’t forget to close the cap. If the concentration becomes thicker in the next use, just add an appropriate amount Anhydrous alcohol is sufficient.
Method 3:
1. According to the shape of the components used in the circuit schematic and the size of the printed board area, arrange the density of the components and the location of each component reasonably. The location of the components should be determined in accordance with the principle of large first, then small, first overall and then local, so that the adjacent components in the circuit are placed nearby and arranged neatly and evenly.
2. The connecting wires between the components must not be at right angles at the corners and the intersection of the two lines, and must be transitioned with curves, nor can they cross each other and detour too far. When some wires can't do this, you can consider printing the wires on the reverse side of the printed board, and then use nails to connect to the front circuit, or use insulated wires to connect the components.
3. The distance between the input part and the output part is better to avoid mutual interference.
