Panefully.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Thursday, March 03, 2011 2:27 AM
To: [log in to unmask]
Subject: Re: [TN] Interesting little story. Sounds vaguely familiar for
me at least
How do you make soldering irons out of stained glass? :-D For that
matter, why don't you use clean glass?
Brian
On 03/03/2011 11:09, Mickey Weiner wrote:
> Right , I use it to clean the tips of my stained glass soldering
irons. It
> does great job on removing the black residue that accumulates on and
around
> the iron tip.
>
> Best Regards
> Mickey Weiner
> 972-8-9774808
>
>
>
> On Wed, Mar 2, 2011 at 8:13 PM, Stadem, Richard
D.<[log in to unmask]>wrote:
>
>> Sal ammoniac is still commonly used as a tip tinning compound today.
Many
>> things change, but some good things stay the same.
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski
>> Sent: Wednesday, March 02, 2011 11:53 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Interesting little story. Sounds vaguely familiar
for me
>> at least
>>
>> Inge,
>>
>> You might be remembering this:
>>
>> http://en.wikipedia.org/wiki/Sal_ammoniac
>>
>>
>>
>>
>> Regards,
>>
>> Ed Popielarski
>>
>> Sr. Mfg. Engr.
>>
>>
>> NBS Corporation
>> 2950 Patrick Henry Dr.
>> Santa Clara, Ca. 95054
>>
>> Ph: 408-654-1100
>> Fx: 408-654-1107
>> Cl: 408-234-1497
>> Cl: 949-581-6601
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
>> Sent: Wednesday, March 02, 2011 2:56 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Interesting little story. Sounds vaguely familiar
for
>> me at least
>>
>> Very familiar indeed.
>> I remember, when I was a little kid, my grandfather was doing some
>> repair of
>> his old Philips radio. He heated his old fashioned soldering iron in
the
>> wood stove, then gave it one or two strokes against a piece of
salmiak
>> (?)
>> and dipped the component's terminal in a thick flux paste and
finished
>> the
>> operation by soldering. It hissed and lots of stinky smoke filled the
>> room.
>> That was probably the start of my interest for electronics. The
golden
>> painted electron tubes fascinated me, also how the magic eye
fluctuated
>> when
>> he was tuning in London BBC.
>>
>> Inge
>>
>> On 1 March 2011 20:19, Gene Felder<[log in to unmask]> wrote:
>>
>>> If you guys had not seen this article, I thought you would enjoy it.
>>>
>>> See
>>>
>>>
>>
http://www.jameco.com/jameco/workshop/techtip/smt.html?CID=March11NL3355
>>
763&<http://www.jameco.com/jameco/workshop/techtip/smt.html?CID=March11N
L3355%0A763&>
>>> sp_rid=MTgyNDYwMTE3NzkS1&sp_mid=3355763
>>>
>>> SMT Soldering Nightmare
>>> Submitted by an anonymous Jameco Customer
>>>
>>> Hi Everyone,
>>>
>>> "I just thought I should share my SMT soldering experience. A
>> particular
>>> chip I wanted to use, specifically a USB-enabled microcontroller,
came
>> only
>>> in an SMT package (44 pins at 0.8mm spacing). I wasn't confident,
but
>> I
>>> figured I could do this. My iron was old and clumsy, but with
careful
>>> application of delicate quantities of solder, lots of flux, and a
reel
>> of
>>> wick I thought I could make do. I've done some passive component
work
>> in
>>> the
>>> past and they came out fine.
>>>
>>> The soldering went okay. Messy, with all the flux and solder bridges
>>> between
>>> pins, but with a little more heat, the wick sucked the excess away.
>> Careful
>>> metering showed all the connections were good. I realized that I
>> needed
>>> sharp meter probes for this. The blunt ones are safer, but I needed
a
>> sharp
>>> one to be sure I'm on the pad at one end and on the pin at the
other.
>> While
>>> I won't try this at home, I've seen a professional use scalpel
blades
>>> welded
>>> to his meter probes just to get them sharp enough.
>>>
>>> Testing was the key, and I tested for both shorts between pins (most
>>> common)
>>> and open connections (they happen too). To fix a bridge, a quick dab
>> of
>>> some
>>> more flux, and a bit of wick was an easy fix. I heated it up and
>> watched
>>> the
>>> excess solder slurp away. I was careful not to over do it because
it's
>> easy
>>> enough to get an open connection instead. With every repair came new
>>> testing
>>> to make sure I wasn't going backward.
>>>
>>> Fighting back the nerves after testing, fixing and retesting, I
>> plugged it
>>> in and turned it on! Smoke came out of the chip. Not good, but I
guess
>> it
>>> makes for a more interesting story.
>>>
>>> This required more inspection of the board layout and more testing.
I
>> found
>>> a few minor concerns that were easy enough to fix. Sadly, however,
my
>>> patient died on the table. The chip was no longer working and was
>>> pronounced
>>> dead due to a hard short across the power rails.
>>>
>>> To remove the corpse I used a hot air gun, usually used for
shrinking
>>> heat-shrink tubing. It runs much hotter than your typical
hair-dryer,
>> so
>>> don't use it for that, but for heating things, it works quite well.
I
>>> clamped up the board and began directing heat over the chip. Sadly,
my
>>> strategy was a bit south of perfection, for my plastic parts
(sockets,
>> etc)
>>> began to melt.
>>>
>>> I stopped and regrouped, electing to make myself a heat shield out
of
>>> aluminum foil. The foil wraps around the board and covers all the
>>> components, except where I've razored out a little square to clear
the
>>> now-dead chip. This worked although the nearby plastic parts still
>> melt a
>>> little, but they were still functional and now had a bit of extra
>>> personality.
>>>
>>> While blowing heat, I lightly pick at the chip with a long sharp
awl,
>> and
>>> eventually (this took some time) it popped loose and fell off the
>> board,
>>> off
>>> of the table and onto my lap. I was wearing shorts. It was hot and
it
>> hurt!
>>> Fortunately, the chip wasn't very large and only left a small
souvenir
>> of
>>> the experience.
>>>
>>> The circuit board clamp, however, offered more resistance, and I
>> managed to
>>> singe a couple of fingertips along the way. Now I cleaned off the
pads
>> with
>>> more flux and wick, I addressed the board layout concerns, and it
was
>> time
>>> to stick down a fresh new chip. It went well with a similar
procedure.
>> All
>>> the connections, including the edited ones on the PCB layout, tested
>> out
>>> fine. I cross-checked it with the specification sheet to confirm I
had
>> done
>>> it correctly.
>>>
>>> I pulled out my handy little microscope and also did a visual
>> inspection
>>> this time of the solder joints. I was ready to try again. Power
>> connected.
>>> Checked for polarity. All was well, until I turned it on.
>>>
>>> Fizzle. Smoke. Pop.
>>>
>>> Another board was inspected, edited, and provided, in case something
>> was
>>> wrong with the first one. Another chip was installed, with an
absolute
>>> minimum of supporting components.
>>>
>>> Fizzle. Smoke. Pop.
>>>
>>> Fortunately I had purchased quite a few of these chips. Much more
>> checking
>>> ensued. On-line designs for similar boards were cross-checked with
the
>> chip
>>> spec sheet. The spec sheet was crossed with the schematic. The
entire
>>> schematic was carefully metered out with a continuity checker,
>> including
>>> possible shorts. All appeared well.
>>>
>>> But the chips kept going up in smoke. A few more iterations of
>> aluminum
>>> foil
>>> and heat-gun work, plus several more hours sticking down and testing
>> more
>>> chips, resulted only in more burnt chips.
>>>
>>> At this point you must be wondering if this story is going to have a
>> happy
>>> ending. Time passed as did the waves of frustration before I was
>> finally
>>> able to establish what may have been the problem. It wasn't a
>> soldering
>>> problem, a circuit board layout issue, personal ESD discharge, the
>> solder
>>> or
>>> the flux I used. Then I started to think that maybe it was the
>> soldering
>>> iron itself that was the problem.
>>>
>>> Never missing an opportunity to buy some new gear from my friends at
>>> Jameco,
>>> I bought a new iron with a properly grounded tip and a much finer
tip
>> at
>>> that. I stuck down yet another chip, and it worked without drawing
>>> excessive
>>> current and/or boiling itself. Yes... It seems at the moment it was
my
>>> soldering iron that was destroying these things. Further experiments
>> are
>>> still in progress.
>>>
>>> A brief note to all my fellow hobbyists who might want to try SMT
>> work. You
>>> should get an ESD-specified soldering iron for anything more
>> complicated
>>> than surface-mount passive components!"
>>>
>>> Gene Felder
>>> [log in to unmask]
>>>
>>>
>>>
>>>
>>>
>>>
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