Sometimes it becomes necessary to produce simple small printed circuit boards.
Ordering their production in the company for a long time and costly, you can make them yourself.
So, the process of manufacturing printed circuit boards at home by steps.
Consider the process of manufacturing printed circuit boards inHome conditions on a specific example. For example, you need to make two boards. One is an adapter from one type of housing to another. The second is the replacement of a large chip with a BGA case for two smaller ones, with TO-252 cases, with three resistors. The board dimensions are 10 × 10 and 15 × 15 mm. There are 2 options for making printed circuit boards at home: using a photoresist and using the "laser irons" method. We use the "laser irons" method.
The process of manufacturing printed circuit boards at home
1. We prepare the design of the printed circuit board. I use the DipTrace program: conveniently, quickly, qualitatively. Developed by our compatriots. Very convenient and pleasant user interface, unlike the generally recognized PCAD. There is a conversion to PCAD PCB format. Although many domestic firms have already begun to take in the format DipTrace.
In DipTrace, you have the opportunity to see your future creation in volume, which is very convenient and obvious. Here's what I should get (boards are shown in different scales):
2. First we mark out the textolite, we cut out the workpiece for the printed circuit boards.
3. We deduce our project on a laser printer in a mirror-like form in the highest possible quality, without stinting on the toner. Through long experiments, the best paper for this was chosen - dense matte photographic paper for printers.
4. Do not forget to clean and degrease the workpiece. If there is no degreaser, it is possible to walk along the glass-fiber cloth with an eraser. Then, using an ordinary iron, we "weld" the toner from the paper to the future printed circuit board. I hold 3-4 minutes under a slight pressure, until light yellowing of the paper. Heating put the maximum. On top I put one more sheet of paper for more even warming up, otherwise the image can "float". An important point here is the uniformity of warming up and pressing.
5. After that, letting the board cool down a bit, put the workpiece with the paper adhered to it in the water, preferably hot. Photo paper quickly becomes wet, and after a minute or two you can carefully remove the top layer.
In places where there is a large accumulation of our future conductive tracks, the paper sticks to the board especially strongly. Do not touch it yet.
6. Give the board another couple of minutes to get wet. The remains of the paper should be carefully removed using an eraser or rubbing the finger.
7. We take out the workpiece. Dry it. If somewhere the tracks turned out not very clear, you can make them brighter than a thin marker for the CD. Although it is better to ensure that all the tracks are equally clear and bright. This depends on 1) the uniformity and adequacy of the preheating of the workpiece by the iron, 2) the accuracy with the removal of paper, 3) the quality of the textolite surface, and 4) the successful selection of paper. With the last point you can experiment to find the most suitable option.
8. We put the resulting blank with the future tracks-conductors printed on it into the solution of ferric chloride. Travim hours 1.5 or 2. While waiting, we will cover our "bath" cover: evaporation is quite caustic and toxic.
9. We take out the prepared boards from the solution, rinse and dry. Toner from the laser printer is remarkably washed off the board with acetone. As you can see, even the thinnest conductors with a width of 0.2 mm came out quite well. There are very few left.
10. Loudim manufactured by the method of "laser iron" printed circuit boards. Rinse off the residue of flux with benzine or alcohol.
11. It remains only to cut our boards and mount radio elements!
With a certain skill, the method of "laser irons"Suitable for the manufacture of simple PCBs at home. The short conductors from 0.2 mm and wider are obtained quite clearly. Thicker conductors are obtained quite well. Time to prepare, experiments with the selection of paper type and temperature of the iron, etching and tinning takes about 3-5 hours. But this is much faster than if you order a fee in the firm. Monetary costs are also minimal. In general, for simple budget radio amateur projects, the method is recommended for use.