[sdiy] Need help with a SMD kit (OT?)

[sleepy_dog at gmx.de]

 > What I also like about the SMD world is the diversity of parts :)

Oh yeah, like this part which is only available as LGA12 (2 x 2 mm², 
0.5mm pin pitch)
https://postimg.org/image/6u7jilc85/

The "dead bug" to the left. (glued on with 2 component glue, then soldered)
Did that today under the Leica EZ4 stereo microscope @ work, on a 
standard 2.54mm (0.1 in) perfboard.
There is no devboard yet for that part, so I did it this way.
Btw, the grey goo coming through some hols left to the cictuit is a 
playdoh like mass called "blue tack"(sp?), which is nice for sticking 
fiddly little boards to the bottom of the microscope for stable 
sodlering, and quickly changing the orientation etc. Very handy.
The IC to the right has 4 outer pins which fit on 4 copper pads, the 
middle pin is bent up and soldered in the air. (precise tweezers for the 
win)
For SOICs I sometimes split the copper eyes in half (2 scratches with 
sharp knife to properly cut contact), and presto, there are 1.27 pads. 
(which won't work with crappy perfboards where the copper eyes are not 
strongly attached even if not split ;) )
(for those wondering why I bothered glueing the electrolytics on 
prototype board: the IC is an accelerometer, and I intend to shake the 
hell out of this board)

Steve


Am 20.07.2017 um 10:39 schrieb paula at synth.net:
>
> Interesting debate,
>
> My tuppence if I may.
>
> Soldering a 16 pin SOIC of TQFP is far quicker than a through hole 16 
> pin DIL. Unsoldering either can be a nightmare if the board has large 
> power/ground planes
>
> For prototyping I'm happy to do boards with around 200 parts, but for 
> more than 3 or 4 boards I would always outsource. I have the same 
> problem with through hole, its BORING doing the same board 10 times (I 
> did this with the monowave, 30 of them with 1500 solder joints on 
> each, never again!
>
> I personally love the challenge of making boards small, in my current 
> work project I've taken a board that was 100mm by 80mm, shrunk it to 
> 63mm by 26mm, and now shrunk it to 30 x 14mm, I'm using QFNs and 0402s 
> (with the odd 0603 that I couldn't get in 0402) and a couple of 0201's 
> to try (just 0ohm jumpers). I've also reduced part count and cost 
> significantly in the process. It's really not hard, but and I'll say 
> it again, for more than 4 or so, I'd outsource it (same would be true 
> if I did a through hole board).
>
> I think a lot depends on your intended market and purpose, for work, 
> it needs to be small, as small as small can be, if not smaller. But if 
> you're making things for home and you're happy with through hole, 
> stick with it :)
>
> What I also like about the SMD world is the diversity of parts :)
>
> Just my tuppence worth
>
> Paula
>
>
> On 2017-07-19 00:18, Tom Wiltshire wrote:
>
>> It's only frustrating until you get some good at it. then it can be 
>> quite rewarding to do something that you initially thought was 
>> impossible. That's pretty much the definition of learning any new 
>> skill, isn't it?
>> Tom
>>
>> ==================
>>        Electric Druid
>> Synth & Stompbox DIY
>> ==================
>>
>>
>> On 18 Jul 2017, at 22:23, David G Dixon <dixon at mail.ubc.ca 
>> <mailto:dixon at mail.ubc.ca>> wrote:
>>> This post sums up why I simply will not do SMD by hand.  Not... 
>>> worth... the... frustration.
>>>
>>>     ------------------------------------------------------------------------
>>>     *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org
>>>     <mailto:diy-bounces at synth-diy.org>] *On Behalf Of *Elain Klopke
>>>     *Sent:* Tuesday, July 18, 2017 12:16 AM
>>>     *To:* *SYNTH DIY
>>>     *Subject:* [sdiy] Need help with a SMD kit (OT?)
>>>     Hey list,
>>>     I bought the Elements diy kit from Synthcube and managed to get
>>>     all the surface mount components attached using solder paste, a
>>>     tiny syringe, and a hot plate. Everything melted nicely and I
>>>     only burnt the solder mask a bit because I wasn't quick enough
>>>     getting it off the hot plate, but the copper traces appear to be
>>>     still attached to the board so I'm not too worried.
>>>     And then the problems started. I let the board cool down and
>>>     then started going about eliminating solder bridges on a couple
>>>     of the ICs. I cleaned up one side of the microcontroller and
>>>     then made the other three worse. I got one chip that was a
>>>     little crooked seated properly and then another popped free and
>>>     I couldn't get it resoldered.
>>>     I've stepped away from the kit so I don't do more damage or
>>>     throw it against the wall in frustration.
>>>     Is there anyone experienced in surface mount soldering
>>>     (preferably in the US) that would be willing to fix this mess
>>>     for me. I'm way out of my depth and am willing to pay postage
>>>     both ways and a fee for your time.
>>>     Thanks in advance.
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>> http://synth-diy.org/mailman/listinfo/synth-diy
>>
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