suppliers of chips, you might get samples taken before the final burn-in
procedure. This means you might have moisture in the chips. These chips need
to be "baked" in 125C for 24 hours before reflow soldering.
The simplest and yet safest ( also cheapest ) way to solder SMD is by using a
hit air soldering iron. You can rather easily build these yourself from an
old 40 - 60 W soldering iron, an aquarium air pump and some tubing materials.
Some use a modifyed desoldering iron from Radio Shack - 10.49 $ worth of
soldering iron and then adding the airflow.
This works absolutely wonderful in combination of pre-heating the PCB to 100C
or so.
Cheers
Dan / M0DFI
On Saturday 06 May 2006 18:19, Tracy wrote:
> --- In kicad-users@yahoogroups.com, "Ehlers, William \(ES\)"
>
> <[EMAIL PROTECTED]> wrote:
> > Before you do this I would go back to the datasheet. You will end up
> > destroying the device if not the board.
>
> Have anyone here actually done this? I have searched and a lot of
> robotics guys do it this way. I checked the data sheets of all the
> components I am planning on using and they can handle wayyy higher
> heat than I plan to use.
>
> Moisture in the board, good precaustion, I can see where that might be
> a problem in home etched boards on suplus board material.
>
> I still can't find a TQFP44 footprint for pcbnew.
> Tracy N4LGH
>
>
>
>
>
>
>
>
> Please read the Kicad FAQ in the group files section before posting your
> question. Please post your bug reports here. They will be picked up by the
> creator of Kicad. Please contribute your symbols/modules to the library
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> development questions visit the kicad-devel group at
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>
>
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Please read the Kicad FAQ in the group files section before posting your question.
Please post your bug reports here. They will be picked up by the creator of Kicad.
Please contribute your symbols/modules to the library folder in the group files section.
For building Kicad from source and other development questions visit the kicad-devel group at http://groups.yahoo.com/group/kicad-devel
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