[sdiy] SMD comming your way

[Magnus Danielson]

Hi SMD-lovers!

OK, so we fooled around in the lab yesterday. Actually, I didn't do much than
comming with encouragement!

Anyway, here you find a few SMD components stacked:
http://ebs.homedns.org/bilder/komponents/komp33/pict2805_Lg.jpg.42.html

We have these stacks:
2412 1210 1206 0805 0603 0402 0201 01005

All are resistors except the 0201 which is a capacitor.

Then we have:

http://ebs.homedns.org/bilder/komponents/komp33/pict2778_Lg.jpg.16.html

Here you see the size of a 01005 well explained, it is quite visibly sloping
due to the height-difference between the gold-plated pads and the green lacquer
covering the PCB. Actually, there is a clearence around the pad where the
lacquer is much thinner.

Here it is soldered in:
http://ebs.homedns.org/bilder/komponents/komp33/pict2779_Lg.jpg.17.html

Here is another example:
http://ebs.homedns.org/bilder/komponents/komp33/pict2765_Lg.jpg.3.html
and soldered in:
http://ebs.homedns.org/bilder/komponents/komp33/pict2770_Lg.jpg.8.html

Oh, the pads on there I beleive is as far as 1 mm apart centrum-to-centrum
distance.

Well, it didn't take too much time for a pro to solder them 01005, but he
think he need to exercise some more. Maybe the 0,23 mm solder wire is a bit to
thick...

Also, all of a sudden electrostatics comes into play. It doesn't help just to
keep an ESD environment, but we might need to keep tools grounded as well.

Also, the tweezers not only need to be grounded, they need to be really clean.
Any residue solder resin make the 01005 stick with the tweezer, so they have to
be cleaned with suitable alcohol to be bare metal, but that works. However, in
any real lab that stuff is just a short stretch away anyway.

OK, so with some minor exercise will the 01005 be handsoldered, or at least by
someone already doing 0402 on a daily basis, which is also possible I might
add.

Cheers,
Magnus - keeping the notes behind the masters back