There are also problems with some components. If you get samples from some
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
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