1 00:00:04,080 --> 00:00:08,080 Homemade printed circuits by the method of ironing 2 00:00:08,080 --> 00:00:22,170 The making of printed circuits by thermal transfer is a pretty cheap technique used to create prototypes or printed circuits of medium complexity. 3 00:00:22,170 --> 00:00:25,670 Materials 4 00:00:25,670 --> 00:00:32,670 Thermotransferable paper 5 00:00:32,670 --> 00:00:35,670 The impression should only be done with a laser printer. 6 00:00:35,670 --> 00:00:41,289 Bakelite 7 00:00:41,289 --> 00:00:47,090 Plastic phenotypic foil covered with a copper foil, which will print the drawing board. 8 00:00:51,159 --> 00:00:51,939 Ferric chloride. 9 00:00:52,460 --> 00:00:55,320 Corrosive compound used for developing the PCB. 10 00:00:58,030 --> 00:00:58,450 Chisel. 11 00:00:59,770 --> 00:01:01,630 Tool used for cutting bakelite. 12 00:01:04,340 --> 00:01:05,280 Electric iron. 13 00:01:05,819 --> 00:01:09,760 Used to iron the drawing board until it's transferred to the bakelite. 14 00:01:11,560 --> 00:01:13,340 Steel wool pad. 15 00:01:13,340 --> 00:01:16,219 Used to clean the copper film bakelite virgin. 16 00:01:20,250 --> 00:01:24,049 Drill Used to drill holes where the legs or pins 17 00:01:24,049 --> 00:01:28,250 enter the components on the PCB. 18 00:01:28,250 --> 00:01:31,810 Beads This should be of different sizes, depending 19 00:01:31,810 --> 00:01:36,530 on the thickness of the legs of the components. 20 00:01:36,530 --> 00:01:40,370 Frozen Natural resin that when mixed with paint thinner 21 00:01:40,370 --> 00:01:44,629 you get a solution to protect the form from rust. 22 00:01:44,629 --> 00:01:49,709 Procedure The first step is to print the printed circuit 23 00:01:49,709 --> 00:01:57,870 pattern on the Propacol paper or the thermotransferable paper, using a laser printer. 24 00:01:57,870 --> 00:02:04,010 The drawing must be in mirror mode, meaning the opposite of how the form it will be. 25 00:02:04,010 --> 00:02:10,389 If it's not reversed, the form will be the other way around making all this labor futile. 26 00:02:10,389 --> 00:02:16,530 We now proceed to cut the drawing, leaving a tap of about 5mm on each side. 27 00:02:16,530 --> 00:02:27,699 You have a margin of error for the time to move the drawing to the Bakelite. 28 00:02:27,699 --> 00:02:33,520 With a sharp chisel and a steel ruler we take as our guide the drawing of the circuit board 29 00:02:33,520 --> 00:03:38,629 and we cut the Bakelite at this same size. 30 00:03:38,629 --> 00:03:44,530 We sand the Bakelite's edge, deburring the remaining copper leaving after the cutting. 31 00:03:44,530 --> 00:03:50,349 This is done so when we iron the boards don't find any obstacles to a uniform pressure plate, 32 00:03:50,349 --> 00:03:56,400 preventing good adhesion of the paper to the Bakelite. 33 00:03:56,400 --> 00:04:02,759 We wash the Bakelite with soap and water degreaser, then with a steel wool pad we shine the copper 34 00:04:02,759 --> 00:04:11,500 until it is spotless without any fingerprints or grease. 35 00:04:11,500 --> 00:04:30,740 This is very important for good adhesion of the design on the Bakelite. 36 00:04:30,740 --> 00:04:36,439 We place the printed circuit pattern on a sheet of paper. 37 00:04:36,439 --> 00:04:42,360 We put the Bakelite virgin over the drawing facing the drawing with the copper. 38 00:04:42,360 --> 00:04:52,259 and we ensure paper drawing and bakelite with a piece of masking tape. 39 00:04:52,259 --> 00:05:00,170 With the iron on his highest temperature we iron for 15 minutes. 40 00:05:00,170 --> 00:05:09,740 Emphasis should be pushing at the edges and the center. 41 00:05:09,740 --> 00:05:14,860 Form the pressure and uniformity with which this process is done depends the quality of 42 00:05:14,860 --> 00:05:26,069 our printed circuit. 43 00:05:26,069 --> 00:05:35,870 Remove the sheet of paper we use to isolate the drawing board. 44 00:05:35,870 --> 00:05:41,110 Re-soak in cold water the Bakelite with the paper attached. 45 00:05:41,110 --> 00:06:03,220 After 10 minutes, the paper should be damp enough to be able to remove it carefully. 46 00:06:03,220 --> 00:06:10,740 If you notice that the paper cannot be removed easily, dip the card for another 5 minutes. 47 00:06:10,740 --> 00:06:16,279 With your fingertips, remove the paper leaving the ink added to the copper. 48 00:06:16,279 --> 00:06:34,189 Do not use nails, because can raise and spoil the printed ink. 49 00:06:34,189 --> 00:06:39,069 To remove the paper's small gaps between the tracks or holes, may use a needle to soften 50 00:06:39,069 --> 00:06:40,790 the paper. 51 00:06:40,790 --> 00:06:59,220 Be careful not to damage the tracks. 52 00:06:59,220 --> 00:07:04,759 So we have removed all the paper leaving the impression of the drawing on the copper. 53 00:07:04,759 --> 00:07:11,259 In a plastic container, add a small amount of ferric chloride. 54 00:07:11,259 --> 00:07:14,839 We add hot water, be careful, this is corrosive. 55 00:07:14,839 --> 00:07:18,480 We immerse the bakelite. 56 00:07:18,480 --> 00:07:23,339 Gently shake the time necessary to remove the ferric chloride copper in areas not covered 57 00:07:23,339 --> 00:07:24,339 by the ink. 58 00:07:24,339 --> 00:07:39,500 We see the printed circuit appears and disappears the excess copper. 59 00:07:39,500 --> 00:07:51,660 After wash the board with thinner to remove the ink. 60 00:07:51,660 --> 00:08:02,079 Then rise it with soap and degreaser. 61 00:08:02,079 --> 00:08:08,180 If for some reason are colliding tracks, separate copper removing the excess with a knife. 62 00:08:08,180 --> 00:08:11,459 Check the paper against light. 63 00:08:11,459 --> 00:08:16,100 Then drill all the holes where are going to be embedded components. 64 00:08:16,100 --> 00:08:39,759 Use the appropriate drilled bit according to the thickness of the legs of each component. 65 00:08:39,759 --> 00:08:45,059 Clean the card again with a steel wood pad to give a shine and smooth finish. 66 00:08:45,059 --> 00:09:09,529 Besides this, prevent corrosion in case there is any remain trace of ferric chloride. 67 00:09:09,529 --> 00:09:29,659 We dilute the rosin in thinner and apply on the card to brighten and protect it from oxidation. 68 00:09:29,659 --> 00:09:35,519 We have our printed circuit board, we hope this tutorial is very useful. 69 00:09:35,519 --> 00:09:36,519 Success!