EMRFD Message Archive 466
Message Date From Subject 466 2007-02-13 11:47:46 Ted Bruce KX4OM More X-Pad photos with BF998 Hi all,
I added four pics to JR's album on X-Pads. The upside-down mounted
BF998s fit snugly in a 1/8" punched hole, but at least one leg barely
touches the foil. Although you can barely see the legs, one is
mounted right-side up over a 3/32" hole.
I'd like to see someone more experienced than me in SMD techniques try
this. I used regular (small diameter) 63-37 Kester solder with no paste.
I need to finish my LED ring flash project. The photos with the pink
anti-static bubble-wrap background were made with a 1.4 M-pixel Sony,
whose flash was better positioned for macro work. The blue background
(mouse pad) was done with a Nikon N-990 3.3 M-pixel ($900 in it's
day!), but the flash is further away from the lens than on the Sony,
so I got shadows.
467 2007-02-13 12:03:12 Don Hackler Re: More X-Pad photos with BF998 Ted Bruce KX4OM wrote:
> Hi all,A bit of solder-wick to soak up some of the excess solder would clean
> I added four pics to JR's album on X-Pads. The upside-down mounted
> BF998s fit snugly in a 1/8" punched hole, but at least one leg barely
> touches the foil. Although you can barely see the legs, one is
> mounted right-side up over a 3/32" hole.
> I'd like to see someone more experienced than me in SMD techniques try
> this. I used regular (small diameter) 63-37 Kester solder with no paste.
them up very nicely.
469 2007-02-14 11:01:00 Ted Bruce KX4OM Re: More X-Pad photos with BF998 Thanks, Don. I was just researching SMD soldering techniques, and one
of the items I came across was to wipe the braid (with the iron, of
course) across the legs of soldered SOIC devices, right down each row.
I'm sure that's old news to those experienced in SMD soldering, but
all of these tips are news to me!
471 2007-02-14 13:38:32 Don Hackler Re: More X-Pad photos with BF998 Surface mount means you pretty much have to "unlearn" a big portion of
your traditional solder techniques.
Most of us learned to make a good mechanical connection followed by a
good wet "fillet" of solder. The
solder was never supposed to be the mechanical connection.
With surface mount, the solder is the only connection, and you end up
using the minimum amount of solder.
All you want is the parts to hold by capillary action of the solder to
hold the part while the solder is melted.
The solder braid will soak up any excess solder.
473 2007-02-14 16:02:31 Ted Bruce KX4OM Re: More X-Pad photos with BF998 Good comments again, Don. I have the flux that's rather thick, that
comes in a short squeeze tube (RadioShack item). I also have a
chiseled felt-tip flux applicator that I ordered from Mouser, but the
flux itself seems kind of thin. I'll have to try it with some SMDs to
see if I can get it to hold in place long enough to tack down one leg.
I use an extension arm lamp for bench work, and I have the wearable
flip down magnifiers..the big black thing, basically like the $5