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whitequark's profile
whitequark
whitequark
whitequark
@whitequark

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whitequark

@whitequark

http://whitequark.org  · http://llvm.moe  · http://powerlinesinanime.tumblr.com  · working on quantum computers for a living · DMs open · she

Joined July 2010

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    1. whitequark‏ @whitequark Sep 18
      Replying to @alt_kia

      SMD can be easier than PTH even, and BGAs are easier than QFN and QFP. SMD parts self-align and can be reworked regardless of the number of pins

      1 reply 0 retweets 4 likes
    2. Kia‏☆‏ @alt_kia Sep 18
      Replying to @whitequark

      i see how do i get started with these parts, what equipment do i need

      1 reply 0 retweets 1 like
    3. whitequark‏ @whitequark Sep 18
      Replying to @alt_kia

      i use stencils and vapor phase soldering personally but that's overkill; solder paste in a syringe and a hot air gun are sufficient for many jobs. i suggest getting junk PCBs and trying to rework random components on them without turning the PCB into char or melting stuff

      2 replies 0 retweets 6 likes
    4. Kia‏☆‏ @alt_kia Sep 18
      Replying to @whitequark

      what is vapor phase soldering?

      1 reply 0 retweets 2 likes
    5. whitequark‏ @whitequark Sep 18
      Replying to @alt_kia

      using phase transition of a fluoropolymer liquid (Fluorinert) as a sort of thermostat. instead of an IR oven with a PID controller you rely on the fact that latent heat of condensation >> heat transferred by convection and radiation, and...

      2 replies 0 retweets 4 likes
    6. Kia‏☆‏ @alt_kia Sep 18
      Replying to @whitequark

      ahh nice. what kind of machine do you use for that?

      1 reply 0 retweets 1 like
    7. whitequark‏ @whitequark Sep 18
      Replying to @alt_kia

      I cobbled together a machine from the cheapest electric pot I found in a store in HK, a PID controller I had lying around, some metal junk as a base, and a solid state relay. search my earlier tweets it has photos

      1 reply 0 retweets 5 likes
    8. Kia‏☆‏ @alt_kia Sep 18
      Replying to @whitequark

      oh WOW that is awesome

      1 reply 0 retweets 2 likes
    9. whitequark‏ @whitequark Sep 18
      Replying to @alt_kia

      thank u

      2 replies 0 retweets 2 likes
    10. Kia‏☆‏ @alt_kia Sep 18
      Replying to @whitequark

      and i saw the website for the fluid you said you used, nice, you can get them in various boiling points

      1 reply 0 retweets 1 like
      whitequark‏ @whitequark Sep 18
      Replying to @alt_kia

      yep yep. can also use them to cool PCBs by submerging in the liquid, it's absurdly efficient AND it's an incredibly good dielectric. people cool CO2 lasers with it too

      9:57 AM - 18 Sep 2018
      • 3 Likes
      • TheTrueCelt Kia‏☆
      2 replies 0 retweets 3 likes
        1. New conversation
        2. whitequark‏ @whitequark Sep 18
          Replying to @whitequark @alt_kia

          it's also nearly harmless (so long as you don't overheat it). they can carry a lot of dissolved oxygen and there's a picture from an old paper where a mouse is breathing oxygenated fluorinert in a beaker.

          2 replies 0 retweets 4 likes
        3. Kia‏☆‏ @alt_kia Sep 18
          Replying to @whitequark

          pic.twitter.com/SCHd6LvVdT

          2 replies 8 retweets 35 likes
        4. whitequark‏ @whitequark Sep 18
          Replying to @alt_kia

          pic.twitter.com/8V8MrM8HRx

          1 reply 2 retweets 8 likes
        5. 1 more reply
        1. New conversation
        2. Kia‏☆‏ @alt_kia Sep 18
          Replying to @whitequark

          yeah i knew about those dielectric engineered fluids but i didn't know soldering with them was that simple!

          1 reply 0 retweets 1 like
        3. whitequark‏ @whitequark Sep 18
          Replying to @alt_kia

          it's the absolute best way of soldering stuff. literally the only way you can mess up is by overheating the liquid.

          0 replies 0 retweets 1 like
        4. End of conversation

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