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Thread: Help with soldering SMD's

  1. #61
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    You are now ready to go out to the world, Young Grasshopper!

    Well done, excellent job! The next time you try again, do not strip too much of the wire insulation. Depending on the insulation type, once heat is applied for the tinning/soldering, the insulation shortens up revealing more bare wire. I would only strip 1/6" to 3/32" of insulation. Once you get it soldered to the SMD, the insulatio will be perfect.

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  3. #62
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    "YOUNG" Grasshopper .... I like that a lot

    The insulation is only plastic BUT is pretty thick for the gauge of wire, which in many ways is a good thing. Thanks for the tip on how much of the insulation to remove as well. The LED is only 1.5 mm wide where the wires get soldered so that is all I really need to strip from the wire. What 1.5 mm is as a fraction, I have no idea but suspect it would be close to 1/8th or a little less, give or take. Bottom line though is - Only remove enough insulation for the wire to cover the contact point on the LED or Resistor or whatever your soldering something too, more or less?
    Cheers Tony

    "Knowing what to do is one thing ... being able to do it is another"
    "It is easy to criticize ... a lot harder when you have to justify it"

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    That result looks pretty damn near perfect to me.

    As to your final questions: 1.5mm is more like 1/16". And you should probably try to remove even less insulation than that, because as you heat up the wire, the insulation will shrink further.

    Another thing you can try is magnet wire, with insulating lacquer which you can just burn away at the solder points. Also doesn't add as much to the thickness of the wire as regular insulation, which can help if you are in a tight spot.

    YMMV,
    Heiko

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    Thanks Heiko and wish I knew about the magnet wire a week ago, I've just bought 2 100' spools of 26 gauge wire. It is funny that you mention magnet wire though. When I was soldering the LED's I used some of those "reverse tweezers" and had a hell of a time getting the LED off of them - almost as if the LED contacts were magnetized.

    Was I imagining things or is that a possibility do you think?
    Cheers Tony

    "Knowing what to do is one thing ... being able to do it is another"
    "It is easy to criticize ... a lot harder when you have to justify it"

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    No, I don't think so, LEDs usually do not contain any magnetic material. But probably some soldering gunk got stuck there - typically the flux included in the solder will melt and then either burn (which creates the nice smoke you get when soldering) or solidify somewhere around the solder joint again. Typically if it's large amounts it will show up as reddish-brown-black drops, but even small amounts can glue parts together.

    Heiko

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