Digest for sci.electronics.repair@googlegroups.com - 23 updates in 7 topics

SeaNymph <SeaNymph@deepbluesea.com>: Aug 18 07:13AM -0500

On 8/17/2015 10:01 PM, The Real Bev wrote:
>>>>> to multitask?
 
> Nobody can multitask, it's just sequential flipping back and forth.
> Women may just need to do more flipping than guys do.
 
This is certainly what the science seems to indicate.
Stormin Mormon <cayoung61@hotmail.com>: Aug 18 09:16AM -0400

On 8/18/2015 8:13 AM, SeaNymph wrote:
 
>> Nobody can multitask, it's just sequential flipping back and forth.
>> Women may just need to do more flipping than guys do.
 
> This is certainly what the science seems to indicate.
 
Well, that sure is the flippin answer.
 
-
.
Christopher A. Young
learn more about Jesus
. www.lds.org
.
.
"(PeteCresswell)" <x@y.Invalid>: Aug 18 09:59AM -0400

Per Don Y:
>three of these, for me -- at <store>".
 
>It also cuts down on that time in the morning when you have to "decide"
>what to wear, "today".
 
Ever since being almost run down on my bike on two occasions less than 2
weeks apart - the common thread being that I was wearing dark clothing -
I have worn nothing but red shirts. Black shorts because that's the
only color that works for cycling.
 
Don't even know how many red shirts I have now... but I'm thinking that
the people who see me every day think I'm disturbed-but-harmless -
wearing the same clothes all the time.
--
Pete Cresswell
"(PeteCresswell)" <x@y.Invalid>: Aug 18 10:04AM -0400

Per The Real Bev:
>Nobody can multitask, it's just sequential flipping back and forth.
>Women may just need to do more flipping than guys do.
 
I think the distinction is between MultiTasking and TimeSlicing.
 
People who "multitask" are really time slicing.
 
Back in The Day, computers used to TimeSlice and the makers called it
multitasking.
 
Now computers can actually MultiTask because they have multiple CPUs and
programmers can write code that runs parallel threads.
 
Dunno about people... We have only one brain, but the brain has multiple
areas dedicated to different processing so I would think the jury is
still out.
--
Pete Cresswell
Ed Pawlowski <esp@snet.net>: Aug 18 10:37AM -0400

On 8/17/2015 10:45 PM, ceg wrote:
 
> What part of that is full of shit?
> (Do you have *better* accident statistics?)
 
> If so, show them.
 
http://www.nbcnews.com/nightly-news/video/why-more-people-are-dying-on-the-nation-s-roads-507057219572
 
http://www.usnews.com/news/politics/articles/2015/08/17/traffic-deaths-up-sharply-in-first-6-months-of-this-year
On the other hand, a growing number of states are raising speed limits,
and everywhere drivers are distracted by cellphone calls and text
messages. The council estimated in a report this spring that a quarter
of all crashes involve cellphone use. Besides fatal crashes, that
includes injury-only and property damage-only crashes.
Ed Pawlowski <esp@snet.net>: Aug 18 10:43AM -0400

On 8/17/2015 11:01 PM, The Real Bev wrote:
 
 
> Nobody can multitask, it's just sequential flipping back and forth.
> Women may just need to do more flipping than guys do.
 
Multitask is just another meaningless buzzword. If you count walking
and chew gum you can put it on your resume. People that claim to be
able to do so are just juggling two or three tasks and building in
inefficiency.
SeaNymph <SeaNymph@deepbluesea.com>: Aug 18 09:39AM -0500

On 8/18/2015 9:04 AM, (PeteCresswell) wrote:
 
> Dunno about people... We have only one brain, but the brain has multiple
> areas dedicated to different processing so I would think the jury is
> still out.
 
The science still seems to indicate that multitasking is a myth. Seems
the brain can only focus on one thing at a time.
 
https://www.psychologytoday.com/blog/the-power-prime/201103/technology-myth-multitasking
 
https://laurenpietila.wordpress.com/2013/04/24/multitasking-is-not-possible-according-to-neuroscience-attention-part-3/
 
http://www.npr.org/templates/story/story.php?storyId=95256794
 
http://www.forbes.com/sites/travisbradberry/2014/10/08/multitasking-damages-your-brain-and-career-new-studies-suggest/
SeaNymph <SeaNymph@deepbluesea.com>: Aug 18 09:40AM -0500

On 8/18/2015 9:43 AM, Ed Pawlowski wrote:
> and chew gum you can put it on your resume. People that claim to be
> able to do so are just juggling two or three tasks and building in
> inefficiency.
 
Sometimes, according to scientists, people can walk and chew gum because
walking is deeply ingrained in the brain and requires no thought.
Attempts to multitasks seem to reduce productivity as well.
Don Y <this@is.not.me.com>: Aug 18 08:58AM -0700

Hi Pete,
 
On 8/18/2015 7:04 AM, (PeteCresswell) wrote:
> multitasking.
 
> Now computers can actually MultiTask because they have multiple CPUs and
> programmers can write code that runs parallel threads.
 
No. Running two or more programs in parallel on multiple cores is
multiprocessing. What you call timeslicing is multitasking. It
is similar, conceptually, to time SHARING but at a much finer grain.
 
> Dunno about people... We have only one brain, but the brain has multiple
> areas dedicated to different processing so I would think the jury is
> still out.
 
The brain is not a single processor (to draw a parallel to computers).
You can chew gum, walk, see, hear, etc. simultaneously. The problem
with "multitasking" is that it calls upon higher functions that are
more language oriented -- if you are 'thinking' about something
(solve a problem) you tend to draw on language. This is a largely
"serial" activity -- you can't keep multiple "conversations" going in
your head concurrently.
 
Think about how hard it is to be engaged in two or more conversations
at a party. OTOH, think about how *easy* it is to be eating hors d'oeuvres,
sipping a cocktail, talking *and* walking across the room (while
carefully avoiding others along the way) at the same time!
Muggles <xyz@pdq.invalid>: Aug 18 11:30AM -0500

On 8/18/2015 8:59 AM, (PeteCresswell) wrote:
 
> Don't even know how many red shirts I have now... but I'm thinking that
> the people who see me every day think I'm disturbed-but-harmless -
> wearing the same clothes all the time.
 
Around here people wear neon colors when their biking. I don't think
I've seen anyone wearing black shorts with a red shirt yet.
 
--
Maggie
Muggles <xyz@pdq.invalid>: Aug 18 11:37AM -0500

On 8/18/2015 10:58 AM, Don Y wrote:
> d'oeuvres,
> sipping a cocktail, talking *and* walking across the room (while
> carefully avoiding others along the way) at the same time!
 
When I was learning ballroom dancing the ladies would always comment
that no matter how hard the man thought it was to lead, we always had it
tougher because we had to do everything going backwards and in heels
plus we had to trust the man knew HOW to lead!
 
--
Maggie
The Real Bev <bashley101@gmail.com>: Aug 18 09:41AM -0700

On 08/18/2015 06:59 AM, (PeteCresswell) wrote:
> weeks apart - the common thread being that I was wearing dark clothing -
> I have worn nothing but red shirts. Black shorts because that's the
> only color that works for cycling.
 
:-)
 
> Don't even know how many red shirts I have now... but I'm thinking that
> the people who see me every day think I'm disturbed-but-harmless -
> wearing the same clothes all the time.
 
I like neon colors, orange or kawasaki green especially. Solids, not a
pattern. Anybody who hits me should NOT be able to tell the judge he
didn't see me.
 
--
Cheers, Bev
-------------------------------------------------------------------------------------
"The day Microsoft makes something that doesn't suck is probably
the day they start making vacuum cleaners." --Ernst Jan Plugge
gregz <zekor@comcast.net>: Aug 18 08:00AM

> generally presumed to be the same as Cramolin. If this is correct,
> then using DeoxIT to "clean" battery contacts just coats the contacts
> with a layer of mineral oil.
 
I was thinking products like 409 were alkaline. Some of the more potent
forms, castrol super clean, and greased lightning, etch glass.
 
From what I know, the current cramolin, still available, sold as
contaclean, is a cleaner, and must be washed away after cleaning. The can I
have got real sticky around nozzle, and the can seems to be eating itself.
I think someone compared spectral components of deoxit vs cramolin, and
were different. Wished I knew more without always comming up with my own
findings on web search.
 
I usually just wipe clean with water, then lube with something like CRC
2-26.
 
Greg
 
gregz <zekor@comcast.net>: Aug 18 08:00AM

>> that.
 
> I don't think I have ever heard of an "organic acid".
> Any examples of mild organic acids you know of?
 
Oleic acid. Stuff found in olive oil. Oleic acid and naphtha, popular
electronic cleaner. Yo can mix with alcohol. Deoxit is a formulation
replacing cramolins formula.
 
Greg
avagadro7@gmail.com: Aug 18 05:50AM -0700

On Tuesday, August 18, 2015 at 4:02:15 AM UTC-4, GS wrote:
> electronic cleaner. Yo can mix with alcohol. Deoxit is a formulation
> replacing cramolins formula.
 
> Greg
 
WIKI- 'Certain types of RTV release acetic acid during the curing process, and this can attack solder joints, causing the solder to detach from the copper wire.'
 
Jiffy was acetic cleaner, as the CRC with plus silicone left on, not as the CRC
Jeff Liebermann <jeffl@cruzio.com>: Aug 18 07:58AM -0700

On Tue, 18 Aug 2015 08:00:30 +0000 (UTC), gregz <zekor@comcast.net>
wrote:
 
>I was thinking products like 409 were alkaline. Some of the more potent
>forms, castrol super clean, and greased lightning, etch glass.
 
According to the MSDS, pH = 9-11.5
<https://www.thecloroxcompany.com/downloads/msds/409products/formula409antibacterialkitchenallpurposecleaner-lemonfreshjw2014-08-10.pdf>
There's something in the formulation of 409 that reacts with something
in the white crud to produce foam and fizz, but offhand, I can't tell
what it might be. Potassium carbonate (K2CO3) and potassium hydroxide
(KOH) are both bases, which should not react with a high pH cleaner.
Digging through the possible K2CO3 reactions:
<http://www.allreactions.com/index.php/group-1a/potassium-k/potassium-carbonate-k2co3>
<http://www.allreactions.com/index.php/group-1a/potassium-k/potassium-hydroxide-koh>
None of the reactions with water produce a gas unless heated.
Everything else is a reaction with an acid. I'm missing something
here.
 
>I think someone compared spectral components of deoxit vs cramolin, and
>were different. Wished I knew more without always comming up with my own
>findings on web search.
 
If it must be wiped off, then it probably contains a mild acid (used
as an oxide remover), which might corrode the contacts if left in
place. My ancient tiny bottle of Cramolin Red also mentions cleaning.
If the can is corroding, it's probably from the acid.
 
>I usually just wipe clean with water, then lube with something like CRC
>2-26.
 
I'm having a bit of a problem with the term "cleaner". We started
with something to clean off the white residue from a leaking battery.
Then, a "cleaner" for removing the oxide from electrical contacts. And
now end up with a "lubricant" for battery contacts that don't move and
probably don't need lubrication. Worse, the description reads much
like a WD-40 clone, where the purpose is only to displace water.
<http://www.crcindustries.com/ei/product_detail.aspx?id=02005>
"Plastic safe lubricant, penetrant and corrosion inhibitor
that helps prevent electrical malfunctions caused by water
penetration, humidity, condensation or corrosion. Restores
resistance values and helps stop current leakage."
 
Want to try an experiment? Find some phosphorescent powder or tracer
additive. Mix it with the "lube". Apply to the battery contacts.
Then use the device for a while. Inspect with a UV flashlight and I
think you'll find the "lube" everywhere EXCEPT around the contact
points. If true, one could probably do as well for battery contact
protection with a giant blob of grease, as in automotive battery
terminals.
 
 
--
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
Jeff Liebermann <jeffl@cruzio.com>: Aug 18 08:20AM -0700


>Battery and ground contact areas eg terminals, clamps, frame connection areas are coated with a thin film of
 
>https://www.google.com/search?q=non+corrosiding+silicone+grease&biw=1103&bih=620&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAmoVChMIjbapgZuxxwIViRk-Ch29zAcT#tbm=isch&q=dialectric+gease
 
Shorter URL's are better. Learn to edit Googlisms:
<https://www.google.com/search?tbm=isch&q=dielectric+gease>
 
Incidentally, I like your mis-spelling of dielectric:
<https://en.wikipedia.org/wiki/Dialectic>
Karl Marx should have used some in his writings to help his theories
hold water.
 
>the grease conducts electricity but not ions in transfer: no white build up
 
Rubbish. Dielectric grease, is by definition an insulator.
<http://www.wisegeek.org/what-is-dielectric-grease.htm>
"Dielectric grease is a non-conductive, silicone-based grease
that's designed to seal out moisture and prevent corrosion
on electrical connectors. It also disrupts the flow of
electrical current, which makes it good for lubricating and
sealing the rubber parts of electrical connectors. It's
commonly used in automotive spark plug wires, recreational
and utility vehicles, and electrical systems in aircraft."
 
If you grease mating surfaces of electrical connections, you're not
going to get a decent connection. Given enough current and a little
dirt to get hot, you can also produce a small explosion[1].
 
 
[1]. In college, I had to deal with a few Persian foreign exchange
engineering students. These were mostly the sons of government
ministers and very important people under Shah Pavlavi. Few had any
mechanical skills in a society where getting one's hands dirty was
unbecoming of the uppper castes. Some, brought their servants.
 
Among the various classes was a semester of metalurgy and welding,
which included operating a spot welder. In order to pass the class,
one of the Persian students took to following me around and mimicking
everything that I did. I decided that he needed to be taught a
lesson. I hid my work and as expected, he asked me what to do next. I
suggested that he grease his sheet metal pieces before spot welding
and I directed him to the can of grease I had thoughtfully provided. I
was almost out the door when the grease exploded in the spot welder
and produced a rather wide black horizontal scorch line across his
clean white shirt. I dissapeared for a day while friends and faculty
tried to convince his servant that killing me was not a good idea.
 
Yes, grease is good, but not in the current flow.
 

 
 
--
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
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Aug 18 10:05AM -0400

On 08/18/2015 04:07 AM, gregz wrote:
> total of six channels. 2 plus 4 ch plugins. These were low bandwidth, so I
> think it was more like looking at data logging events,
 
> Greg
 
The Tek 11801 series has four slots, each of which can take a
dual-channel plug-in. Plus there's an expansion unit (SM-11) that will
take 16 more plug-ins (multiple units can get you up to 136 channels).
So there's life after two-channel scopes. ;)
 
Cheers
 
Phil Hobbs
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
 
160 North State Road #203
Briarcliff Manor NY 10510
 
hobbs at electrooptical dot net
http://electrooptical.net
"Arfa Daily" <arfa.daily@ntlworld.com>: Aug 18 09:46AM +0100

"Phil Allison" <pallison49@gmail.com> wrote in message
news:040210fa-0ca8-4d06-abba-7ebf7cebb8cc@googlegroups.com...
> output stage) via a diode bridge and also triggers the clipping limiter
> (U1A) via R26 to ground.
 
> .... Phil
 
Thanks for that, Phil. Much appreciated. Odd how it works for a short while.
Before having the schematic, I gave everything in the area a good dousing
with freezer when it failed, but nothing really that I would say was very
positive. Maybe - and it *was* a maybe - the 5532 was a bit sensitive, but
it was inconclusive. I did notice that when it was wrong, the waveform on
pin 7 I think it was, was much bigger than 'normal' and the output TRs on
that side got quite hot quite quickly.
 
I'll try and find time to get another look today or tomorrow with the
benefit of your schematic. Thanks again
 
Arfa
Phil Allison <pallison49@gmail.com>: Aug 18 04:55AM -0700

Arfa Daily wrote:
 
> it was inconclusive. I did notice that when it was wrong, the waveform on
> pin 7 I think it was, was much bigger than 'normal' and the output TRs on
> that side got quite hot quite quickly.
 
 
** Is there a dummy load connected ?

The clip indicator is probably just showing the channel is being overloaded, as is the rapid heating. Could there be an intermittent short in the output wiring ?
 
Also, I see there are two PCBS, small signal and power stuff, interconnected by some kind of multi-pin. You must know how reliable they all are...
 

> I'll try and find time to get another look today or tomorrow with the
> benefit of your schematic. Thanks again.
 
 
** I found the Alto schem on a net forum, it looked terribly familiar.
 
Have you not seen the QSC's USA models or the MX700 ?
 
 
 
... Phil
N_Cook <diverse@tcp.co.uk>: Aug 18 11:38AM +0100

The off-the-shelf ones seem either the easy way round,small to large, or
too bulky.
I've about the space of 3 DIP16 stacked on top of one other to play
with, after removing and replacing a large choke, for access purposes.
Existing pads are for SOP-16 but only DIP-16 ICs available.
At the moment I'm thinking 16 short lengths of thin plain tinned copper
wires soldered to the pads. Thin short sleeves over every other wire.
DIP-16 glued in place over the original site and then the 16 wires
soldered to the DIP16 pins.
I tried ,as a test any old DIP16 chip, bending and splaying the pins
to engage in a .05 inch , SIL,header socket . That would work , just,
but unlikely be able to compress those lines of pins widthways, as well,
for the width of SOP IC pads and still line up with the pads.
N_Cook <diverse@tcp.co.uk>: Aug 18 09:59AM +0100

Got those 4 replaced, but that would not make the amp cut out.
I'd decided the amp cutting out was due to the dI/dt protection part of
the IXDD404 of the driver IC of the "digital" amps protecting, due to
bad contacts of the crimps of the internal speaker wires.
Then on rassembly noticed the undersides of the 3 main DC supply wires
from ps to pa, the unobserved top sides, against flat steel of the mixer
were not compressed. Laying over the thin edge of the steel plate
vertically dividing ps and pa . Squashed against the steel screen plate
, like a guillotine, under the mixer until the red one had its
insulation so sqashed into a grove, as to touch ground . Cable now tied
down to the vertical side of that divider , not the top.
sms <scharf.steven@geemail.com>: Aug 18 01:53AM -0700

On 8/15/2015 7:57 PM, Jeff Liebermann wrote:
>> "installation fee".
 
> I certainly suggested buying the SB6141 at Costco, but I don't believe
> it was me that suggested negotiating the installation fee. At the
 
<snip>
 
Comcast always seems to charge the $50 then waits for the customer to
call to argue about it. Probably many don't call.
 
I also got the Motorola modem at Costco and did a self-install and
initially was charged the installation fee.
 
The problem I had was with getting them to install a drop, with RG6,
from the pole. I told them I needed a drop because the old drop, which I
had never used, was RG59. The first three trucks they sent were
unprepared to do a new drop. Finally I used a tree trimmer to cut down
the RG59 so there was no old drop there to confuse them, and then they
were able to put in a new drop.
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