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resources:creating_pcbs_with_surface_mount_devices [2019/05/09 12:28]
tggzzz
resources:creating_pcbs_with_surface_mount_devices [2019/09/23 12:51]
tggzzz
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 ====Soldering==== ====Soldering====
 For hand soldering, a temperature-controlled iron with a 0.5mm tip. I used the cheapest iron I could find, so I don't know the temperature,​ but it wasn't set at maximum. It is possible to solder all components by hand, which enables a board'​s function to be tested bit-by-bit, but it would be tedious for a second board. For hand soldering, a temperature-controlled iron with a 0.5mm tip. I used the cheapest iron I could find, so I don't know the temperature,​ but it wasn't set at maximum. It is possible to solder all components by hand, which enables a board'​s function to be tested bit-by-bit, but it would be tedious for a second board.
 +
 +Be aware that touching ceramic components with a soldering iron can cause cracking through thermal stresses, and MLCCs have "​exotic"​ dielectrics that can change at high temperature.
  
 I also used a technique inspired by [[https://​www.sparkfun.com/​tutorials/​59|SparkFun'​s reflow skillet method]]. Through hole components are left until later. I initially intended to use my slow cooker, but didn't reach the necessary temperature quickly enough, so instead: I also used a technique inspired by [[https://​www.sparkfun.com/​tutorials/​59|SparkFun'​s reflow skillet method]]. Through hole components are left until later. I initially intended to use my slow cooker, but didn't reach the necessary temperature quickly enough, so instead:
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 I remove excess solder using a copper braid that I impregnate with liquid flux just before use. That seems to work, but one pad/track did begin to lift after I heated it up too much.  I remove excess solder using a copper braid that I impregnate with liquid flux just before use. That seems to work, but one pad/track did begin to lift after I heated it up too much. 
  
-I haven'​t tried the HackSpace'​s ​hot air gun, yet, but in theory that is gentler and better.+To remove a single component, surround other components with polyimide/​kapton tape, and use a hot air gun. If positioned correctlythe tape will deflect the hot air away from surrounding components.
  
 It is possible to reflow a second time, apparently without problems. It is possible to reflow a second time, apparently without problems.
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