Because through hole parts take more heat than do SMT's.  And some of the
 SMT's I use aren't even supposed to be hand soldered (ie 0402 parts).
 But for prototyping and proof of concept circuits, soldering is just fine.
 I use solder paste and then reflow it with the tip of my soldering iron.
 I use just under 600 degrees to do this (560 to 580).   But for soldering
 through hole parts, I'll need 650 - 680 degrees or so, depending on the 
 ground plane area.   

 About your missing out on certain instructions, that is probably true.
 I have been in the electronics business for over 30 years, and there is
 rarely a week goes by when I don't learn (or relearn) something.  Either 
 someone suggests a method or idea I haven't thought of, or I read 
 something in a trade rag that either shows a new or different technique,
 or else inspires me or another here to think of some new way of doing
 something.  So, if you missed some instructions, don't sweat it.  Just be
 open and on the lookout for new tidbits of info.  Never stop learning.


                                              Regards,

                                                Jim


> On Mar 15, 2006, at 1:15 AM, Paul James E. wrote:
> 
>>  I change temperatures often in the course of a day.
> 
> 
> Ok.  Why?  When should one use different temperatures in soldering?
> Since I learned to solder back before easily settable temps were
> available, I seem to have missed out on certain instructions.
> 
> BillW
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