Dave,
One technique that can be a bit risky is to add a solder blob to one
side & then loosen the component using an iron from the other. - ie
use the thermal capacity of the solder blob in place of another iron.
You run the risk of overheating the component but if it's just for
removal that's no issue. OTOH I've use the same technique when
salvaging quad packaged microcontrollers many times and not had many
failures at all - maybe one or two. (Prototyping use only - NOT
reccomended for production).

RP

On 28/08/06, Dave King <KingDWS@shaw.ca> wrote:
> My desire to try an salvage a few parts is not a matter of money, its
> a simple matter of time. I somehow live in the electronic middle of
> nowhere and have to order in everything. Whats funny is they try to
> promote this hole as the new sillycon valley of the north.... Just
> try to find common transistors here. Anyway I need to have a couple
> of proto boards running by mid week to do a show n tell and so far
> no parts in sight.
>
> Just hoping some manual desoldering technique will give me a greater
> chance of having usable parts to use. I did look at a few 20x parts(specs
> of dust) for cracks as one person suggested, and they still metered out
> right after taking them off with the wick method. It is rather tempting
> to fire up the torch and give the board a rap or two though.
>
> Dave
>
> > On Sun, 2006-08-27 at 05:11 -0700, Dave King wrote:
> > > Just wondering about how much success anyone has had
> > desoldering SMT parts
> > > for reuse. Actually wondering which of the various methods work
> > or don't.
> > >
> > > I'm trying to get a air rework station but for now I have my normal
> > > soldering
> > > station and a spool of wick. I've had one person suggest to forget the
> > > wick and just alternate the iron tip from side to side on say a resistor
> > > until
> > > it comes loose. And supposedly this works fine until trying to
> > do flat packs
> > > and larger chips.
> >
> > Reusing something as cheap as an smt resistor or cap doesn't make much
> > sense to me personally. That said, yes, the "alternate from side to
> > side" method works very well and I can get parts from 1206 down to 0201
> > off without much difficulty these days.
> >
> > For larger packages the only way by hand IMHO is hot air. With a good
> > nozzle you can get nearly any smaller (say 48pin or lower) chip off
> > without much trouble. Larger chips take more skill, but are certainly
> > possible.
> >
> > TTYL
> >
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