PCB Blog - Six methods of homemade circuit board PCB board

1. Homemade circuit board PCB board method 1:
1) Cut the copper clad PCB board to the size required by the circuit diagram.
2) Put the wax paper on the steel plate, use a pen to engrave the circuit diagram on the wax paper at a ratio of 1:1, and cut the circuit diagram engraved on the wax paper according to the size of the circuit board, and place the cut wax paper on the printed copper plate. Take a small amount of paint and talc powder to make a suitable thin and thick printing material, dip the printing material with a brush, apply it evenly on the wax paper, repeat it several times, and the circuit can be printed on the printed board. This stereotype is reusable and suitable for small batches.
3) Prepare a corrosion solution with 1 gram of potassium chlorate and 40 ml of hydrochloric acid with a concentration of 15%, and apply it to the place to be corroded on the circuit board for corrosion.
4) Wash the corroded printed board with water repeatedly. Wipe off the paint with banana water and wash it a few more times to keep the printed board clean without leaving any corrosive liquid. Apply a layer of rosin solution to dry and drill holes.

2. Homemade circuit board PCB board method 2:
There are many ways to make printed boards under amateur conditions, but they are either time-consuming, complicated "craftsmanship", or of unsatisfactory quality. And my method of making printing plates belongs to a better comprehensive effect, the method is as follows:

1) Making a printing plate diagram. The pads in the figure are represented by dots, and the connection can be a single line, but the position and size need to be accurate.
2) Cut the printing plate according to the size of the printing plate, and clean the copper foil surface.
3) Use carbon paper to copy the diagram to the printing board. If the circuit is relatively simple, and the maker has certain experience in board making, this step can be omitted.
4) According to the specific conditions of the actual components, paste standard pre-cut symbols (pads) with different inner and outer diameters; then, depending on the current size, paste tape lines of different widths. For standard pre-cut symbols and tape, available from electronics stores.
5) Use a soft hammer, such as smooth rubber, plastic, etc., to tap the sticker to make it fully adhere to the copper foil. Focus on the corners and overlaps of the lines. In cold weather, use a heater to warm the surface to enhance the adhesion.
6) Put it into ferric chloride to corrode, but it should be noted that the liquid temperature is not higher than 40 degrees. After the corrosion, it should be taken out and rinsed in time, especially if there are thin lines.
7) Punch the eyes, brighten the copper foil with fine sandpaper, apply rosin alcohol solution, and let it dry to complete the production. The quality of this printed board is very close to the regular printed board. The 0.3mm tape can be passed between the two feet of the IC, which can greatly reduce the short jumpers on the front of the board to save trouble and time. I often use this method to do experimental printing plates or a small amount of products in my work.

3. Homemade circuit board PCB board method 3:
Dissolve one part of the lacquer sheet (ie shellac, available in chemical raw material stores) in three parts of anhydrous alcohol, and stir it properly. Showing a certain color, after stirring evenly, it can be used as a protective paint to paint the circuit board. First polish the copper-clad 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 for adjusting the thickness of the strokes. Adjustable, and can draw a very thin straight line by using a ruler and a triangle ruler, and the drawn lines are smooth and uniform, without edge jaggedness, giving people a smooth and fluent feeling; Write the lines drawn by Chinese characters, English, pinyin or symbols. If it infiltrates the surrounding, the concentration is too small, you can add a little lacquer; if you can't drag the pen, it is too thick, you need to add a few drops of anhydrous alcohol . It doesn't matter if the drawing is wrong, just use a small stick (matchstick), make a small cotton swab, dip it in a little anhydrous alcohol, you can easily wipe it off, and then redraw it. Once the circuit board is drawn, it can be etched in a ferric chloride solution. After the circuit board is corroded, it is also very convenient to remove the paint. With a cotton ball dipped in anhydrous alcohol, the protective paint can be wiped off. Due to the fast evaporation of alcohol, the prepared protective paint should be stored in a small bottle (such as an ink bottle) sealed and stored. Don't forget to close the bottle cap after use. If the concentration is thickened next time, just add an appropriate amount Anhydrous alcohol will do.

4. Homemade circuit board PCB board method 4:
Paste the instant sticker on the copper foil of the copper-clad plate, then draw a circuit on the veneer, and then use a carving knife to carve through the veneer layer to form the required circuit, remove the non-circuit part and use ferric chloride to corrode or current electrolysis. The method can make a more ideal circuit board. The corrosion temperature can be carried out at about 55 ℃, and the corrosion rate is faster. Rinse the corroded circuit board with clean water, remove the sticky notes on the circuit, make holes, wipe it clean and apply rosin alcohol solution for use.

5. Homemade circuit board PCB board method 5:
1) According to the shape of the components used in the circuit schematic diagram and the size of the printed board area, the density of the components and the position of each component are reasonably arranged. The location of components should be determined in accordance with the principle of large first, then small, first whole and then part, so that adjacent components in the circuit are placed nearby and arranged neatly and evenly.
2) The connecting wires between the components cannot turn at right angles at the corners and where the two lines intersect, and must use curved transitions, nor can they cross each other and detour too far. When some wires can't do this, consider printing the wires on the reverse side of the printed board, and then connect them to the front circuit with piercing nails, or use additional insulated wires when soldering components.
3) The distance between the input part and the output part is better to avoid mutual interference.

6. Homemade circuit board PCB board method 6:
Radio hobbyists have struggled with making circuit boards. Now to introduce a "sub-printing" method to make printed circuit boards. Methods as below:
1) Print the circuit board diagram on 80g copy paper at a ratio of 1:1 on the printer. You can also draw 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 hot melt plastic film (available from our company). Put the circuit diagram into the entrance of the fax machine, and use the copy button of the fax machine to copy the circuit diagram on the hot-melt plastic film. At this time, the "printed original" of the printed circuit board is ready.
3) Use double-sided tape to flatly stick the prepared plastic film on the copper-clad plate. Note that it should be flat, not wrinkled, and the tape paper should not cover the melted part, otherwise it will affect the production effect of the circuit board.
4) Brush the paint evenly on the plastic film with a paintbrush. Note: You cannot brush back and forth, but only in one direction. Otherwise, the plastic film will be wrinkled together, and the lines on the copper plate will overlap. After the circuit diagram is all over, carefully remove the plastic film. At this point a printed circuit board is printed. After drying, it can be corroded.
If you want to print multiple pieces, you can make a wooden frame that is a little bigger than the circuit board, and lay the silk screen (the company has silk screen for sale) flat on the wooden frame and fix it. Then use double-sided tape to stick the fixed plastic film under the screen. Put the copper-clad plate on the table, close the screen frame (the printed image and the copper-clad plate should be aligned left and right), use a paintbrush to brush the paint in one direction, and remove the mesh frame. The printed circuit boards is printed.