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Home made printed circuits by the method of ironing
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Printed circuit manufacture easily, quickly and inexpensively.
Homemade printed circuits by the method of ironing
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The making of printed circuits by thermal transfer is a pretty cheap technique used to create prototypes or printed circuits of medium complexity.
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Materials
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Thermotransferable paper
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The impression should only be done with a laser printer.
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Bakelite
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Plastic phenotypic foil covered with a copper foil, which will print the drawing board.
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Ferric chloride.
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Corrosive compound used for developing the PCB.
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Chisel.
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Tool used for cutting bakelite.
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Electric iron.
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Used to iron the drawing board until it's transferred to the bakelite.
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Steel wool pad.
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Used to clean the copper film bakelite virgin.
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Drill Used to drill holes where the legs or pins
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enter the components on the PCB.
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Beads This should be of different sizes, depending
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on the thickness of the legs of the components.
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Frozen Natural resin that when mixed with paint thinner
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you get a solution to protect the form from rust.
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Procedure The first step is to print the printed circuit
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pattern on the Propacol paper or the thermotransferable paper, using a laser printer.
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The drawing must be in mirror mode, meaning the opposite of how the form it will be.
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If it's not reversed, the form will be the other way around making all this labor futile.
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We now proceed to cut the drawing, leaving a tap of about 5mm on each side.
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You have a margin of error for the time to move the drawing to the Bakelite.
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With a sharp chisel and a steel ruler we take as our guide the drawing of the circuit board
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and we cut the Bakelite at this same size.
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We sand the Bakelite's edge, deburring the remaining copper leaving after the cutting.
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This is done so when we iron the boards don't find any obstacles to a uniform pressure plate,
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preventing good adhesion of the paper to the Bakelite.
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We wash the Bakelite with soap and water degreaser, then with a steel wool pad we shine the copper
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until it is spotless without any fingerprints or grease.
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This is very important for good adhesion of the design on the Bakelite.
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We place the printed circuit pattern on a sheet of paper.
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We put the Bakelite virgin over the drawing facing the drawing with the copper.
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and we ensure paper drawing and bakelite with a piece of masking tape.
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With the iron on his highest temperature we iron for 15 minutes.
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Emphasis should be pushing at the edges and the center.
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Form the pressure and uniformity with which this process is done depends the quality of
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our printed circuit.
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Remove the sheet of paper we use to isolate the drawing board.
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Re-soak in cold water the Bakelite with the paper attached.
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After 10 minutes, the paper should be damp enough to be able to remove it carefully.
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If you notice that the paper cannot be removed easily, dip the card for another 5 minutes.
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With your fingertips, remove the paper leaving the ink added to the copper.
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Do not use nails, because can raise and spoil the printed ink.
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To remove the paper's small gaps between the tracks or holes, may use a needle to soften
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the paper.
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Be careful not to damage the tracks.
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So we have removed all the paper leaving the impression of the drawing on the copper.
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In a plastic container, add a small amount of ferric chloride.
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We add hot water, be careful, this is corrosive.
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We immerse the bakelite.
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Gently shake the time necessary to remove the ferric chloride copper in areas not covered
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by the ink.
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We see the printed circuit appears and disappears the excess copper.
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After wash the board with thinner to remove the ink.
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Then rise it with soap and degreaser.
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If for some reason are colliding tracks, separate copper removing the excess with a knife.
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Check the paper against light.
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Then drill all the holes where are going to be embedded components.
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Use the appropriate drilled bit according to the thickness of the legs of each component.
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Clean the card again with a steel wood pad to give a shine and smooth finish.
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Besides this, prevent corrosion in case there is any remain trace of ferric chloride.
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We dilute the rosin in thinner and apply on the card to brighten and protect it from oxidation.
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We have our printed circuit board, we hope this tutorial is very useful.
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Success!
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- Autor/es:
- Construyasuvideorockola.com
- Subido por:
- Antonio S.
- Licencia:
- Reconocimiento - No comercial
- Visualizaciones:
- 68
- Fecha:
- 22 de enero de 2018 - 10:00
- Visibilidad:
- Público
- Centro:
- IES ANTONIO MACHADO
- Duración:
- 09′ 58″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x720 píxeles
- Tamaño:
- 94.63 MBytes