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  • Breugel completed the lesson Welcome to Welding in the class Welding Class11 months ago
  • Breugel commented on TechnicalKid's instructable PCB etching (prototyping)1 year ago
    PCB etching (prototyping)

    Hi Kid,Beautiful presentation, we need more guys like you. I am making home prototype boards for the past four years and if I may, let me add some suggestions.Temperature, try to work with an ambiant temperature of at least 18 degrees C for the liquids.I buy my boards without sensitive film on it (the sensitive one are VERY expensive here (South Africa).I use sand paper grid P1000 to clean the copper layer, then a lint free paper with acetone to obtain a perfect base for the sensitive film (lint free to avoid dust on the board).Then I sensitize the copper with "Positive Resist" from ITW Chemische Produkte.I dry the film in my self build dryer at +- 70 degrees C for 20 minutes and let it cool down.I print the circuit on a translucid paper (A4 tracing paper) mirror image with a ...

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    Hi Kid,Beautiful presentation, we need more guys like you. I am making home prototype boards for the past four years and if I may, let me add some suggestions.Temperature, try to work with an ambiant temperature of at least 18 degrees C for the liquids.I buy my boards without sensitive film on it (the sensitive one are VERY expensive here (South Africa).I use sand paper grid P1000 to clean the copper layer, then a lint free paper with acetone to obtain a perfect base for the sensitive film (lint free to avoid dust on the board).Then I sensitize the copper with "Positive Resist" from ITW Chemische Produkte.I dry the film in my self build dryer at +- 70 degrees C for 20 minutes and let it cool down.I print the circuit on a translucid paper (A4 tracing paper) mirror image with a lazer printer to obtain the tracks and pads in a nice dark colour. I then expose them in my self build UV box for 7 minutes.The fluorescent lights must be the light blue tubes, the one used for moskitoes killer and not the dark one used in night clubs.I then plunge my exposed board in a solution of +-7 grams of caustic soda (the crystal one) mixed with 1 liter of water.The tracks will appear darker within 1-2 minutes and the exposed part will dilued.I then etch the board in Ferric Chloride until it is perfect.I then clean the board with acetone to remove the dark traces and voilà.The whole process take less than 1.5 hour.Drill, populate, test.Eric

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