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Wireless Power - Beyond the Phone
Blog Shaky hands and precision soldering do not mix
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  • Author Author: aemarconnet
  • Date Created: 14 Apr 2014 2:21 PM Date Created
  • Views 2465 views
  • Likes 1 like
  • Comments 13 comments
  • wireless_power_challenge
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Shaky hands and precision soldering do not mix

aemarconnet
aemarconnet
14 Apr 2014

For prototyping purposes i was hoping to try my hand at soldering some leads to a super-cap charger from TI. Unfortunately the package is a 16VQFN and my feeble attempt at tacking leads onto these 0.2MM pitch pads did not end well. I think the photo below gives a good indication of of the size of the package. (keep in mind my hands are not HUGE)

 

image

 

After a little over an hour of effort trying to solder leads to this package i gave up. I will have to build a breakout PCB for this, but it seems my solder paste is expired and i will need some more single-sided, copper-plated, PC board. The order is placed on amazon and i should have them soon this week.

 

Anybody have recommendations for soldering these small packages? The only re-flow i have done is repair to electronics like the XBox 360 GPU (Red Ring of Death).

 

Wish me luck!

Alex

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Top Comments

  • DAB
    DAB over 11 years ago +2
    Just wait until your eyesight fails and you get arthritis in your hands. That's when you know its time to let others do these kinds of things. DAB
  • mcb1
    mcb1 over 11 years ago in reply to DAB +1
    The eyesight is enough .. let alone adding shaky hands or arthritis. I had to replace a smd chip the other day, and despite having the appropriate hot air smd tool, it was still strange to rely on heating…
  • michaelwylie
    michaelwylie over 11 years ago +1
    I solder almost exclusively under a microscope because of stuff like this. Advice for soldering leads to that? It's really ambitious and it makes me anxious just to think about it. I can just imagine getting…
  • mcb1
    mcb1 over 11 years ago in reply to DAB

    I'd need to use the fume extractor to try that at work ...

    Mark

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  • DAB
    DAB over 11 years ago in reply to mcb1

    I like your solution, especially with a good 12 year old scotch with just a touch of water to bring out the aroma.

     

    Ah the pleasant bouquet combined with rosin smoke makes for a pleasant work place.

     

    DAB

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  • mcb1
    mcb1 over 11 years ago in reply to aemarconnet

    I usually find a few swigs takes out both shaky hands ...

    well at least until you have shaky hands pouring it ....

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  • aemarconnet
    aemarconnet over 11 years ago in reply to mcb1

    Mark, that is a really good idea...it would take at least one of my shaky hands out of the equation....i should have some copper board here soon and should be able to just surface mount and make my own break-out board; but i think your idea is worth a shot.

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  • mcb1
    mcb1 over 11 years ago in reply to aemarconnet

    you would find a bottle of scotch for when

    maybe a few swigs would help steady the hand.

     

     

    I was wondering if this might work.

    • Find a piece of plain pcb or protoboard.
    • Stick the chip upside down to the pcb using a bit of bluetac or similar.
    • Solder wires onto plain pcb around the chip or pins you want to connect to.
    • Once soldered, mechanically arrange the wire to touch the pin on the chip.
    • Solder the wire at the chip.
    • Remove the pcb end of the wire (or connect to it).

     

    Looks like my sample pieces are the same.

     

    Mark

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