sci.electronics.repair - 14 new messages in 7 topics - digest

sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en

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* audio attenuator headphone to line - 1 messages, 1 author
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TOPIC: top quality, cheap price, jordan shoes,nike air max etc,prompt delivery-
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http://groups.google.com/group/sci.electronics.repair/t/b5fa760cce0bf0d8?hl=en
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TOPIC: audio attenuator headphone to line
http://groups.google.com/group/sci.electronics.repair/t/b3898a02f147d683?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Jul 11 2010 1:33 am
From: "Dave Plowman (News)"

In article <4c389aba$0$27995$db0fefd9@news.zen.co.uk>,
tg <nospam@nospameverever.net> wrote:
> I want to make a simple audio attenuator by soldering a couple of
> resistors into a cable, similar to here:
> http://www.epanorama.net/circuits/speaker_to_line.html this page talks
> about attenuating speaker level down to line level with 10k and 1k but I
> want to attenuate headphone level down to line level. I haven't done
> this before and want to get it right so can anyone advise on the correct
> resistor values to use?

Replace that circuit temporarily with a 10K pot. Adjust the level to what
you want. Measure both sides of the pot relative to the slider and make up
a fixed attenuator to the same percentage values - the actual total load
across the headphone output isn't critical. A total of 1-50K should be ok.

--
*The closest I ever got to a 4.0 in school was my blood alcohol content*

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

==============================================================================
TOPIC: Latest Computer Technology
http://groups.google.com/group/sci.electronics.repair/t/a7d8d96153fa8d96?hl=en
==============================================================================

== 1 of 6 ==
Date: Sun, Jul 11 2010 9:55 am
From: Namra Sohail

Hi,i find a latest technology information hope you like it so much

http://science-n-technologyworld.blogspot.com/2010/07/latest-computer-technology.html

== 2 of 6 ==
Date: Sun, Jul 11 2010 11:24 am
From: Adrian C

On 11/07/2010 17:55, Namra Sohail wrote:
> Hi,i find a latest technology information hope you like it so much
>
>
> http://science-n-technologyworld.blogspot.com.IS_SPAM

Usenet 2010 SPAM Emergency Relief Appeal.

Please visit the following site and generously mention this spammers
URL. In doing so you will help make Usenet a truely better place.

<http://preview.tinyurl.com/report-a-spam-blog>

Thank you brothers and sisters,

Go in Peace (Shoot to kill ...)

--
Adrian C

== 3 of 6 ==
Date: Sun, Jul 11 2010 1:30 pm
From: David Nebenzahl

On 7/11/2010 11:24 AM Adrian C spake thus:

> On 11/07/2010 17:55, Namra Sohail wrote:
>
>> Hi,i find a latest technology information hope you like it so much
>>
>> http://science-n-technologyworld.blogspot.com.IS_SPAM
>
> Usenet 2010 SPAM Emergency Relief Appeal.
>
> Please visit the following site and generously mention this spammers
> URL. In doing so you will help make Usenet a truely better place.
>
> <http://preview.tinyurl.com/report-a-spam-blog>
>
> Thank you brothers and sisters,
>
> Go in Peace (Shoot to kill ...)

I duly reported it there, but I'm not sure that's the right place. The
TinyURL unrolls to http://help.blogger.com ... blah blah blah. But since
the offender's spam link is a Blogspot blog, shouldn't this complaint be
lodged with Blogspot, not with Blogger (which seems to be Google's blog
service)?

I mean, I'm all for eliminating spam, but let's not go off half-cocked here.

--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

== 4 of 6 ==
Date: Sun, Jul 11 2010 2:24 pm
From: Adrian C

On 11/07/2010 21:30, David Nebenzahl wrote:

> I duly reported it there,

Thanks. That's two reports, at least.

This particular Indian idiot has been here 4 times in the last month ;-(

but I'm not sure that's the right place. The
> TinyURL unrolls to http://help.blogger.com ... blah blah blah.

It's landing at the correct page - Blogspot.com is the domain where
google generally hosts blogger blogs.

Text on that page link report reads,

"Help us to make Blogger and Blog*Spot spam-free
by reporting spam blogs below"

though whether google takes notice of it ...

Live in hope :-)

--
Adrian C

== 5 of 6 ==
Date: Sun, Jul 11 2010 3:48 pm
From: David Nebenzahl

On 7/11/2010 2:24 PM Adrian C spake thus:

> It's landing at the correct page - Blogspot.com is the domain where
> google generally hosts blogger blogs.
>
> Text on that page link report reads,
>
> "Help us to make Blogger and Blog*Spot spam-free
> by reporting spam blogs below"
>
> though whether google takes notice of it ...
>
> Live in hope :-)

Heh; maybe it's already been taken care of: going to the original
spam-blog link yields:

"The blog you were looking for was not found."

--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

== 6 of 6 ==
Date: Sun, Jul 11 2010 10:29 pm
From: John Robertson

David Nebenzahl wrote:
> On 7/11/2010 2:24 PM Adrian C spake thus:
>
>> It's landing at the correct page - Blogspot.com is the domain where
>> google generally hosts blogger blogs.
>>
>> Text on that page link report reads,
>>
>> "Help us to make Blogger and Blog*Spot spam-free
>> by reporting spam blogs below"
>>
>> though whether google takes notice of it ...
>>
>> Live in hope :-)
>
> Heh; maybe it's already been taken care of: going to the original
> spam-blog link yields:
>
> "The blog you were looking for was not found."
>
>

I'M simply forwarding these 'messages' and all their headers to the
newsgroup source - in this case "groups-abuse@google.com".

Whether or not Google does anything is not known, but it doesn't hurt to
let them know and there do appear to be fewer of these messages lately...

John :-#(#

--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

==============================================================================
TOPIC: Old Solder
http://groups.google.com/group/sci.electronics.repair/t/1325a43abbae0cc1?hl=en
==============================================================================

== 1 of 3 ==
Date: Sun, Jul 11 2010 10:46 am
From: Smitty Two

In article <pan.2010.07.05.13.58.47@gmail.com>,
Meat Plow <mhywatt@yahoo.com> wrote:

> On Sun, 04 Jul 2010 07:28:40 -0700, Smitty Two ??o??:
>

> >> --- Joe
> >
> > I'm the militant s.e.r. liquid flux advocate. If you're going to solder
> > at all, especially to make repairs, you *need* liquid flux, period. One
> > of these days I'll make a video for youtube demonstrating how flux
> > facilitates soldering. I don't care if you think you've been soldering
> > fine without it for 50 years, if you don't use it, you have no idea what
> > you're missing.
>
> Never used anything but rosin core flux except to solder copper pipe.
> Maybe you could 'explain' what it is I might have been missing over the
> last 30 years?

What you may have been missing is the speed, ease, and quality of
soldering with liquid flux vs. relying solely on the resin core. Here's
just a couple of examples off the top of my head, without benefit of a
full pot of coffee yet:

1. Try assembling a through-hole board with several hundred components
by hand. Hell, try installing one component, say a 14-pin DIP. Then
inspect the top side to see how much solder actually flowed all the way
through to the top side. Without flux, many or most of the joints would
be rejected. Without flux, you will spend at least five times as long
doing the assembly.

2. Try installing a QFP100 without flux. Time your effort. Inspect the
results under a microscope. Can you spell "slow and ugly?" Now try flux.
Once the chip is positioned, you can easily make all 25 solder
connections along each side with a single drop of solder on the tip of
the iron. Just spread a drop of flux down the row, and skate the iron
down it. Takes about 1-2 seconds to make 25 perfect solder connections,
with no bridging thanks to the flux. Same technique used on any surface
mount package of more than a few pins.

3. Try tinning stranded wires without a little additional flux. Chances
are you'll take five times as long, and the solder won't penetrate to
the center very well.

4. For cold or cracked solder joints on repairs, there's already plenty
of solder on the joint. A single tiny drop of liquid flux will let you
reflow what's there with far more elegance than gobbing on a big
additional wad of solder just to release a speck of flux from it.

5. Maybe this one should have been first: Ever needed three hands to
solder something? One to hold one of the parts, one for the soldering
iron, one for the solder? Say a butt joint on a couple of wires, or
adding a pigtail to something, or hanging a capacitor off the back side
of a board as a temporary fix? Try this:

Put a bit of solder on each part. Hold parts next to each other and
put a drop of flux on them both. Now reflow the solder with the iron.
You absolutely, positively cannot do this well without liquid flux, yet
the need to do it comes up almost daily for anyone that does any
reasonable amount of soldering.

So don't take my word for it. Go to any manufacturing facility that does
any hand soldering, and you'll find a little bottle of flux at every
workstation. Try it yourself and you'll see why.

== 2 of 3 ==
Date: Sun, Jul 11 2010 11:39 am
From: Jeffrey D Angus

Smitty Two wrote:
> So don't take my word for it. Go to any manufacturing
> facility that does any hand soldering, and you'll find
> a little bottle of flux at every workstation. Try it
> yourself and you'll see why.

Oh yeah, I keep one on each active bench here.

Jeff

--
"Egotism is the anesthetic that dulls the pain of stupidity."
Frank Leahy, Head coach, Notre Dame 1941-1954

http://www.stay-connect.com

== 3 of 3 ==
Date: Sun, Jul 11 2010 1:20 pm
From: Jeff Liebermann

On Sun, 11 Jul 2010 10:46:33 -0700, Smitty Two
<prestwhich@earthlink.net> wrote:

>What you may have been missing is the speed, ease, and quality of
>soldering with liquid flux vs. relying solely on the resin core.
(...)

Nice list.

I've been soldering for about 50 years and only recently have started
to use bottled flux. I quickly tin both ends of whatever I'm
soldering first. That leaves a little flux on each end. If done
correctly, I haven't found the need for liquid flux for large
components. Tinning and intentionally leaving flux on the components
requires more skill than is commonly available and isn't suitable for
tiny components.

I've recently been dealing with badly reflow soldered BGA chips,
usually inside laptops. The trick is to reflow the solder bumps
(usually with a hot air gun) without moving anything. Without a
wetting agent (flux), the solder bump and PCB solder pad will not
reflow together. Getting the flux to flow under the BGA is a major
problem. My current method is to use a bent needle syringe, but that
only works for small BGA's. Spraying with an atomizer and air hose
works well, but also makes a huge mess.

For soldering big heavy lugs and cables, flux is also required. The
small amount of flux (about 5%) found in common solder is
insufficient. By the time the solder melts and flows into the wire,
all the flux has been burned off. The only choice is to add more
flux. To avoid the drippy mess, I use rosin paste flux for lugs and
cables.

Another headache is mixing leaded and unleaded solder. I have
separate irons and solder rolls for each. I can mix solder types and
get a usable joint, but it takes more effort and often looks more like
dross than a proper connection.

There's also such a thing as defective solder. I once bought a small
roll of "electronic solder" at a hardware store that was awful. The
flux would sputter and spray small balls of solder everywhere. I
managed to do the soldering only to find that nothing less than
acetone would remove the flux residue. Alcohol wouldn't touch it.

More on flux:
<http://yarchive.net/metal/soldering_flux.html>

Make your own flux:
<http://www.instructables.com/id/Make-your-own-Eco-friendly-soldering-flux/>
I've done this with violin rosin and pine tree pitch. It works.
Unfortunately, it smells like a burning forest, causing everyone in
the lab to panic.

As for the old solder, I haven't had much trouble with flux loss with
rosin core solder. I have several rolls "liberated" from a previous
employer that are easily 20 years old, and are still in use. That's
not the case with acid core solder (not suitable for electronics). My
roll of acid core plumbing solder looks corroded. The steel reel on
which it's rolled is also corroded, indicating that the acid flux is
somehow leaking and attacking everything nearby. The OP's solder
collection is rosin, so flux loss should not be a problem.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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