[sdiy] "obsolete" 2N3906

[Tim Ressel]

Yo,

I've used this technique. It helps to flood the area
with flux. And it is a really good idea to get the
ultra-small SMD solder. 

Of course, finding someone who is 8" high with
excellent eyesight helps, too   ;-)

--Tim

--- ASSI <Stromeko at compuserve.de> wrote:
> On Monday 09 June 2003 10:06, Paul Maddox wrote:
> > Though soldering a 208pin TQFP was NOT fun !
> (Xilinx SpartanII
> > 300Kgate device) other than that I've done upto
> 144 pin TQFP and
> > single resistors/caps without any problems.
> 
> There's a little trick that can make it much easier.
> You do have to 
> practice a bit with killed chips or empty packages.
> Put the package 
> down flat and just fix two diagonal corners with a
> needle tip. Check 
> the alignment and that the package really is flat,
> apply a hint of flux 
> on the leads. Then get out a larger iron (around 30W
> or so) with a 
> wedge tip and make a good sized bead of solder on
> the tip (just enough 
> so it doesn't fall off). Now start at one of the
> loose corners and 
> slowly pull the solder bead over the leads. Getting
> the velocity right 
> and holding it steady is the tricky part. Go steady,
> never stop and 
> supply new solder as it is consumed. After you've
> done one side, let 
> the package and the PCB cool down. There's typically
> a few leads that 
> have bridges, you can clean them off by touching up
> with a needle tip 
> later. PLCC can be soldered the same way, although
> you may need a 
> slightly larger iron.
> 
> 
> Achim.
> -- +<[ Q+ & Matrix-12 & WAVE#46 & microQkb Omega
> sonic heaven ]>+ --
> 
> Q series MIDI Implementation & additional
> documentation:
> http://homepages.compuserve.de/Stromeko#WaldorfQDocs


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