[sdiy] pros and cons of SMT in DIY

[Roman Sowa]

Fort tacking down mod wires I use regular hot-glue sticks with iron set 
to about 200C. Not only you can solder thru, but it actually works well 
as solder flux if I ever need to solder something inside a hot-glue blob.

Talking about crazy SMD prototyping, here's an example to what I did 
with 3x3mm 10-leads DFN package. I used thin magnet wire to actually add 
leads to it. When done, it looked like a cool little spider.
http://www.synthdiy.eu/files/qfnwires.jpg

Roman


W dniu 2017-05-20 o 17:30, Vladimir Pantelic pisze:
> rather than superglue, maybe use something like this to tack down the wires:
>
> https://www.amazon.com/MG-Chemicals-Silicone-Modified-Conformal/dp/B008O9YIV6
>
> it can be even soldered through for subsequent repairs/mods...
>
>
>
> On 20.05.2017 17:15, Richie Burnett wrote:
>> Paula, when you say "working with 0402", do you mean replacing the odd
>> component here and there, or soldering 100s of SMT parts on?  And how
>> are you actually doing the soldering?  With a fine tipped soldering iron
>> and a steady hand?  ...heater tweezers?  ...or stencilling solder paste
>> onto the board then placing components into the paste and ovening the
>> board?  Just curious what methods you're using, particularly to get
>> consistent results with those tiny QFNs.
>>
>> I can also vouch for the structural integrity of super-gluing down
>> wire-wrapping wire or polyurethane enamelled copper (magnet wire) for
>> mods to PCBs.  Never seen one fail, and they're almost impossible to rip
>> up if you need to.  I've never felt entirely happy with the fumes given
>> off when someone has to solder in an area of the board polluted with
>> dried Cyanoacrylate glue though.  I remember doing this once and leaping
>> backwards with my eyes and nose stinging!  Can any of the chemists on
>> this list comment on what vapours are liberated when a hot soldering
>> iron touches cured Cyanoacrylate glue?  (I appreciate that I should
>> already have been soldering in an area with positive airflow away from
>> me, extraction to outdoors, etc...)
>>
>> -Richie,
>>
>> -----Original Message----- From: paula at synth.net
>> Sent: Saturday, May 20, 2017 3:45 PM
>> To: cheater00 cheater00
>> Cc: Synth DIY
>> Subject: Re: [sdiy] pros and cons of SMT in DIY
>>
>> On 2017-05-20 03:42, cheater00 cheater00 wrote:
>>> Yes, a TH pcb will be able to hold a daughter pcb just by the
>>> through-holes, whereas SMD pads will not hold one. So you can easily
>>> change topology using an extra pcb on a TH circuit but not on an SMT
>>> circuit.
>>
>> You know you can use both SMT and through hole if you need?
>> My current project for work has around 100 SMT parts, and 7 through
>> hole, some of which are for PCB interconnect.
>>
>> At the end of the day, the choice is up to the designer.
>> I'm really comfortable working with 0402 and QFN (3mm x 3mm) packages,
>> and with modding them with mod wires if needed (for the record super
>> gluing a mod wire makes it rock solid).
>> I'm considering trying 0201 for some parts, just as a personal challenge
>> :)
>>
>> So it's up to each person.
>> There's no "right or wrong" or "this way is better", it's just
>> different.
>>
>> Paula
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