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PCB Forum First attempt at SMD soldering
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Related

First attempt at SMD soldering

Andrew J
Andrew J over 7 years ago

I bought a practice kit that, in theory at least, lights up LEDs in some sequence.  I say in theory, but as all the instructions (presumably) are in Chinese, who knows??  Anyway, it has components in a number of sizes: 1206, 0805, 0603, 3528, not sure for the ICs.

 

I've spent the afternoon soldering away - 76 components - and what can I take away from the experience?  Well:

  1. forget 0603, I'm not going there again.  Just too small for hand soldering.  I did of course lose a 0603 capacitor to the God of Misery and the kit had no spares.  One day, I expect to find it. Or not.
  2. forget resistor arrays as well (I think that's what they are), especially in 0603.  Seriously, what sadist invents such a thing??
  3. 0805 is likely to be the minimum I go with.
  4. I need a microscope to do this stuff.  At my age, my eyes aren't good enough and I have a bit of handshake too.  See also (1)!
  5. I need more practice at (a) soldering; and (b) keeping care of my tip.
  6. 0.46mm solder is still a bit thick, but just about do-able.  I dare say if I was better at 5a then it would be ok
  7. Still unsure of the best tip to use.  I had a 1.2mm chisel tip which is the smallest that I have, bar a pointy one
  8. Solder wick (decent stuff) is very useful
  9. It's not clear what the markings on a LED are - there were two variants (green marks on one lot, cut corner on the other lot.)  I did search but found the information results confusing: I assumed the marks referred to the Cathode.
  10. The ICs weren't too bad: I can't detect bridging, solder wick helped
  11. I don't think I'd be too worried about it in the future, at least I've taken the plunge right!  I'm not convinced I'd do better with paste and a hot-air gun either.

 

Questions I have:

  1. Is 350c too hot?  I used leaded solder: Sn 62, Pb 36, 2Ag with 505 rosin cores from Multicore.  It has a melting temperature of 179C.
  2. Would I fair better with a thinner tip?
  3. I used flux but my experience was it burnt off immediately and seemed to do nothing - related to questions 1 and 2?

 

I suppose the question on everyone's lips is "did it do anything?"  Well, in short, no.  I tested the resistors and they seemed ok, the ICs were getting voltage to the correct pins so I know they are the right way around.  Perhaps the LEDs are on the wrong way, perhaps the soldering isn't right, perhaps components are not in the right place (no markings on the tapes so I may have deduced incorrectly), perhaps it doesn't do anything anyway, perhaps, perhaps.  I'm not too bothered: it was a test/practice of soldering SMDs which it achieved.

 

I could definitely do with more practice but I expect I'll get better over time.  I also think that these practice kits are a good idea and I would recommend one to someone whose not done this before.

 

Thanks for listening image

 

EDIT: I have a follow up thread as well - https://www.element14.com/community/message/275494/l/second-attempt-at-smd-soldering#275494

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Top Replies

  • Andrew J
    Andrew J over 7 years ago in reply to Fred27 +9
    I can do you a photo, I'm not ashamed . Don't look too closely at the Capacitors though - those were (some of) the evil 0603s, one of which has gone on holiday. This was all done by eyesight as well.
  • jw0752
    jw0752 over 7 years ago +8
    Hi Andrew, I think you did a pretty good job too. With respect to the LEDs I always use a small analog multimeter set to R X 1 to test and verify polarity on small difficult LEDs. In the case of my analog…
  • Fred27
    Fred27 over 7 years ago +7
    No photos? Maybe best not for your first attempt! Of course you can now practice some rework until either the LEDs light up or you destroy it by lifting a track. It won't take long to get used to SMD.…
Parents
  • colporteur
    colporteur over 7 years ago

    Are you able to share the product name and number for the kit?

     

    What did it contain or not contain you would recommend in a practice kit?

     

    My solder skills were developed well over 35 years ago. I never had the opportunity to work in SMD. I recently purchased a ruler guide to help me understand terminology. Using the ruler made it easy for me to follow the discussion.

     

    Sean

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  • colporteur
    colporteur over 7 years ago

    Are you able to share the product name and number for the kit?

     

    What did it contain or not contain you would recommend in a practice kit?

     

    My solder skills were developed well over 35 years ago. I never had the opportunity to work in SMD. I recently purchased a ruler guide to help me understand terminology. Using the ruler made it easy for me to follow the discussion.

     

    Sean

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  • Andrew J
    Andrew J over 7 years ago in reply to colporteur

    Hi Sean,

     

    if you search on Amazon for 'SMD practice kit' you get loads of hits (co.uk and .com sites) so take your pick.  I'm not sure I can recommend any one over the other as I suspect they are pretty much all much-of-a-muchness.  If I was doing it again, which I might, I'd avoid the ones with anything smaller than 0603 (on the other hand, it's just practice so what's the worst that can happen??)  You'll have read the comments above, all of which are essential-to-very-useful to take on board.  You will need a magnifying glass minimum but it's a bit hit or miss as you can use it to line things up, but need to put it down to actually solder!  A microscope or at least some form of hands-free magnification would be useful - given the price, I won't buy a microscope for a kit but will do when I get around to my project which I'll probably use SMD parts for.

     

    Sorry, to specifically answer your question: it contained components that could be soldered with an iron, i.e. no hidden pads like a QFN package.  The smallest component was 0603 which I didn't particularly like, but it's practice so you may feel differently.  You'd want something with one or two ICs in it as well.  There are some that might produce something useful, like light up icicles for christmas decorations but these seem to be a little expensive.  I wouldn't worry too much about Chinese-only instructions as there should be a schematic and at least a list of the components and sizes, but you will need to do some figuring out.

     

    Hope that helps and good luck.

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