sci.electronics.repair - 15 new messages in 8 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: Another reason ...
http://groups.google.com/group/sci.electronics.repair/t/a9a63c157742e708?hl=en
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== 1 of 4 ==
Date: Tues, Nov 16 2010 5:01 pm
From: Jeffrey Angus

On 11/16/2010 6:31 PM, Arfa Daily wrote:
> Nobody disputes that we cannot continue using the fuels that we
> currently do, to generate electricity. However, we already have a
> perfectly adequate 'alternative' to fossil fuels in nuclear. All it
> needs is for people to lose their unfounded and hysterical fears of the
> technology, which are created in no small part by media hype, and a
> vociferous anti-nuclear brigade.

It's not all media fueled hype. Some of it is very well deserved.

http://en.wikipedia.org/wiki/Hanford_Site

I'm reminded of an episode of the Simpsons where Mayor Quimby is
showing off the new alert sign in front of the nuclear power plant.
When it gets to stage 4 "Run for your lives" Homer remarks, "That'll
never happen." When questioned by a co-worker if he felt that the
site was safe Homer replied, "No, just that if the core melts, there
won't be any electricity to run the sign."

The biggest hurdle to overcome with safe nuclear energy is the age
old problem of "Who's guarding the guardians?"

If the debacle with British Petroleum and the government agencies
that were supposed to over see what was being done is any indication,
I'd rather not have to "trust" my government to make sure things are
safe.

Jeff

== 2 of 4 ==
Date: Tues, Nov 16 2010 6:35 pm
From: "Brenda Ann"

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:ibv84h$2ne$1@news.eternal-september.org...
>> The last Albertsons in my area closed a couple years ago.
>> It had the highest prices of any supermarket, so most of
>> the customers lived within walking distance.
>
> QFC is Kroger's "high-end" store in the Seattle area. (Kroger's bought
> Fred
> Meyer a few years ago.)

As a more or less life-long Portlander, I was a bit saddened when Fred Meyer
passed from family ownership to Kroger's. However, I still think they missed
a good bet... they should have changed the name to Freddy Kroger's.. maybe
even gotten Robert Englund to do their signage.. :)

== 3 of 4 ==
Date: Tues, Nov 16 2010 10:48 pm
From: "Michael A. Terrell"

William Sommerwerck wrote:
>
> > The last Albertsons in my area closed a couple years ago.
> > It had the highest prices of any supermarket, so most of
> > the customers lived within walking distance.
>
> QFC is Kroger's "high-end" store in the Seattle area. (Kroger's bought Fred
> Meyer a few years ago.) The QFC near me was rather small, so when the
> economy got tight, it wasn't surprising it shut down.
>
> If any of your stores are owned by Kroger's, try the Kroger's brand raisins.
> Beat the heck out of Sunsweet -- taste just as good, and are softer.

Kroger has no stores in Florida that I know of. They attempted to
open a couple about 15 years ago, but sold the new buildings before they
ever opened.

I shopped at a Kroger's supermarket when I lived in Ohio for almost
all my groceries.

--
For the last time: I am not a mad scientist! I m just a very ticked
off scientist!!!

== 4 of 4 ==
Date: Tues, Nov 16 2010 10:48 pm
From: Jeff Liebermann

On Wed, 17 Nov 2010 00:31:29 -0000, "Arfa Daily"
<arfa.daily@ntlworld.com> wrote:
>Nobody disputes that we cannot continue using the fuels that we currently
>do, to generate electricity. However, we already have a perfectly adequate
>'alternative' to fossil fuels in nuclear.

Yep. Nuclear is also the answer to your aversion to CFL lighting.
<http://www.uncoveror.com/nukebulbs.htm>
Full spectrum lighting with emissions from RF to gamma rays.
The only problem is clearing the room from the mushroom cloud every
time you turn it on.

Ok, the lack of any additional references to this device strongly
suggest that it's a hoax, but I couldn't resist mentioning it.

Incidentally, I invented the nuclear waste powered home water heater,
which should also be a big hit after we run out of oil. What to do
with reactor waste? Just take it home and use it to run your buried
water heater.

Jeff (Sci-Fi) Liebermann

--
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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http://groups.google.com/group/sci.electronics.repair/t/cab4511408b7dc7e?hl=en
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== 1 of 1 ==
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== 1 of 1 ==
Date: Tues, Nov 16 2010 6:35 pm
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==============================================================================
TOPIC: Calculating Power Factor
http://groups.google.com/group/sci.electronics.repair/t/b2d11ce5d56ec333?hl=en
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== 1 of 1 ==
Date: Tues, Nov 16 2010 9:20 pm
From: Cydrome Leader

Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
> Steve Kraus wrote:
>
>> Jamie wrote:
>>
>>> what you're seeing in the xformer is normal. the xformer is
>>> returning
>>>the current phase from the current applied source which comes back out
>>>of phase with it, thus, the current you see is lagging behind from
>>>which it was created from the voltage you now see going the other
>>>way...
>>>
>>> Power Factor (F) is the difference between True power (resistive)
>>> and Apparent power (reactive)...
>>
>>
>>
>> My aim here is to estimate real power draw. I've got a switch mode supply
>> putting out about the same output and it draws about 8A per leg. (I don't
>> know anything about PF or reactive power on that one). This transformer
>> type rectifier is drawing 18A per leg. I know from asking around that this
>> particular brand is known to have inefficiently wound transformers. So
>> that accounts for part of it. But there's also the matter of taking into
>> account reactive power & power factor.
>>
>> BTW, output in both cases is about 62A at about 22V.
> It's possible it has a saturated core transformer. What this does is
> causes the input side to exert the rated operating current at all times
> but this type of design is best at keeping the transformer at a safe
> operating Q to help prevent unwanted harmonics and oscillations in the
> circuit that can take place where capacitors are in the coil design.
> You see this in microwave ovens due to the cap in the hV circuit..
> with out the saturated transformer it can hit a resonance that can
> become destructive.

dumb question time.

What does the magnetron behave like in a circuit? I realize it's basically
a giant rectifier tube, but I'm not wise on tube characteristics and
behavior. I imagine there's some bizarre resistive component, but that's
all I can come up with.

==============================================================================
TOPIC: After stuxnet, nuclear watchdog could expand computer safety measures
task
http://groups.google.com/group/sci.electronics.repair/t/41713b6443089503?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Nov 16 2010 9:20 pm
From: sunitha frnd

THE International Atomic Energy Agency could add computer security at
nuclear plants to its remit after it emerged that stuxnet, the first
computer worm known to attack industrial machinery, is indeed targeted
at nuclear energy equipment as many observers had suspected.

Delivered online or via a USB stick, stuxnet used now-patched Windows
vulnerabilities to seek out Windows PCs running software that monitors
industrial control computers made by Siemens of Germany. The higher
the frequency, the faster the motor.

http://t.co/S51vs4U

==============================================================================
TOPIC: Self-Repair Manifesto
http://groups.google.com/group/sci.electronics.repair/t/047741f126542a73?hl=en
==============================================================================

== 1 of 4 ==
Date: Tues, Nov 16 2010 9:34 pm
From: "Wild_Bill"

I wonder if the dead TV was free, and if you hadn't been able to download a
pirated service manual for free, if you would have been willing to pay
$60-$100 for a service manual.
Essentially, you got lucky with the availability of the service
documentation.

Nearly anything man-made can be repaired.

New technology requires new equipment to be able to service it.. I see
micro-sized SMT components that are barely visible, and I wouldn't care to
handle repairs involving these components without the proper tools and a
very good microscope.

I have a B&L stereo zoom microscope, head worn stereo loupes (Eschenback and
others) and various video cameras that would be helpful in viewing the
micro stuff, but even these tools don't make repair jobs on the newer micro
stuff simple.

I have hot air and typical soldering/desoldering equipment, and professional
(above average hobbiest/enthusiast) troubleshooting equipment, and I still
don't have any desire to repair any of this cheaply made, newer technology
equipment.

I admit that if someone were to give me an out-of-warranty, free, expensive
piece of equipment, I'd be curious enough to spend a little time
troubleshooting just to satisfy my curiosity.

I prefer to buy quality older equipment that can be repaired (large CRT
stuff excluded), instead of microprocessor-based, firmware operated stuff
that's generally much more difficult to repair, even if any
documentation/online-hack info is available.

--
Cheers,
WB
.............

<PlainBill47@yawho.com> wrote in message
news:lsh5e6psn3od195kssu3o11l7u8enlr1of@4ax.com...
> On Mon, 15 Nov 2010 17:37:11 -0500, "Charles"
> <charlesschuler@comcast.net> wrote:
>
>>
>>
>>"Jeff Liebermann" wrote in message
>>news:ku5vd69620loo76cngf77dc4k9lhnpol6u@4ax.com...
>>
>><http://www.ifixit.com/Manifesto>
>>
>>Sorry, but the year is 2010 and repair of recent and future electronic
>>products is not going to happen, as least as what can be accomplished by
>>Joe
>>consumer. For the factory authorized geek squad, sure they PERHAPS have
>>access to data and modules and software and they can, in some cases,
>>repair
>>electronic items.
>>
>>I'd love for it be so, by the way. I detest sending stuff to landfills
>>and
>>to recycling centers. But the truth is that there is not much inside a
>>modern electronic gadget that is repairable. SMT has rendered component
>>replacement impossible, for many cases. Schematics are no longer
>>obtainable. Embedded software makes troubleshooting almost impossible.
>>Repair parts are not available. And the list goes on.
>>
>>Richard Feynman (a Nobel winner) often talked about taking radios apart.
>>If
>>he would try that now, he would move on to biology.
>>
>>
>>
> Wrong on so many counts that it is laughable. SMT devices require new
> techniques. ONE example of many similar events. About a year ago I
> obtained a 'dead' 50" plasma TV. Plug it in, it tries to turn on,
> then the red light on the front panel starts flashing 2 short, 1 long.
> Download the service manual (free from Elektrotanya.com), it's
> flashing error 12; problem with the 12V supply. Read the service
> manual. 12V error may be due to a problem with the audio amp or with
> the DC-DC converter. Disconnect the audio amp, no change. Read more
> of the service manual. Overloading the 12V supply by the DC-DC
> converter may be due to shorted mosfets. In that case, replace both
> the mosfets and the controller, all are SMD parts. (The DC-DC-
> converter is part of the Small Signal Board, available online for
> under $100).
>
> Order the parts from Digikey, for a total cost of less than $10,
> including shipping. Use Chipquick and a soldering iron to remove the
> old parts, solder braid to remove the old solder and Chipquick,
> install the new parts. Reassemble the TV, cross my fingers, plug it
> in. It turns on and works perfectly. Just for luck I verify all
> power supply voltages and update it to the latest firmware.
>
> The biggest problem was moving the 100 lb + monster around.
>
> I've said this repeatedly, new technology requires new techniques.
> The people who claim it's unrepairable either have a vested interest
> in selling a new one or are incompetent.
>
> PlainBill

== 2 of 4 ==
Date: Tues, Nov 16 2010 10:28 pm
From: "Wild_Bill"

The issue of personal injury liability isn't addressed. Lots of DIY types
don't understand the safety aspects of line operated equipment.

Any time I get a used piece of equipment, I examine it for signs of
disassembly and repairs.
One sign of a not-so-bright DIY type, is large burrs on the phillips case
screws.

When manufacturers make service documentation available for line operated
equipment, they don't know that only trained professional service/repair
people will properly interpret the service info. They include disclaimers,
but that my not be a bullet-proof legal position.
Something as simple as placing a long screw where a short screw belongs, can
compromise the safety of a properly designed, line-isolated hot chassis.

Put simply, unsupervised, untrained DIY-types shouldn't be repairing
line-operated equipment.

Any experienced equipment servicer should know that it only takes very
little current to interrupt normal heart rhythm.

When someone buys a piece of equipment that has been repaired improperly,
it's a smear on the manufacturer's reputation.
If I were a manufacturer, I wouldn't want improperly repaired pieces of my
products available as used (unauthorized refurbished) equipment, injuring or
pissing off a lot of consumers.
An improperly repaired/modified charging circuit causes a battery to explode
and/or catch fire, for example.

I imagine that the best way to stop throw-away product manufacturing would
be to stop buying it.
I don't like that nearly all of the cheaply made products are ending up in
landfills, any more than anyone else.
Apparently many consumers don't realize that buying this cheap crap costs
them twice, the first time to go to the store and the purchase, then a
second time to dispose of it.
Careers in management of waste should be abundant for years into the future.

The Commonwealth of Pennsylvania actually accepts municipal (and probably
industrial) waste to be hauled into PA from as many as 15 other states
(maybe more, now).
Since PA is bordered by only 6 states, this would mean that states beyond
the bordering states are hauling waste long distances to dump waste into PA
landfills.. that's a lot of fuel, whether the waste is moved by truck (most
likey transportation) or railway.

According to statistics, Americans generated nearly 230 million tons of
municipal solid waste in 1999 (when many stores didn't sell practically all
made in China goods).
Of the 230M tons, it's stated that 28% was recycled, and 15% incinerated.

I wonder what the term "recycled" actually means in report statistics.
Maybe some of the plastic products were used in synthetic lumber products,
possibly.. or just sent to a recycler that may have just disposed of the
materials later.

--
Cheers,
WB
.............

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:ku5vd69620loo76cngf77dc4k9lhnpol6u@4ax.com...
> <http://www.ifixit.com/Manifesto>
> --
> 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

== 3 of 4 ==
Date: Tues, Nov 16 2010 11:02 pm
From: Jeff Liebermann

On Wed, 17 Nov 2010 00:34:59 -0500, "Wild_Bill"
<wb_wildbill@XSPAMyahoo.com> wrote:

>Nearly anything man-made can be repaired.

Yes, but it might not be worth fixing, especially if a replacement is
low cost. I constantly run into problems spending inordinate amounts
of time fixing some trivial device. Sure, it can be fixed, but I
can't build a business on such repairs. Expensive and exotic hardware
is about all I can make a profit on. For example, it takes me about 4
billable hours to clean up and upgrade a virus infected computer. At
$75/hr, it's almost more economical to purchase a newer and faster
machine, than to fix the old one. So, in order to keep from losing
the customer, I have to heavily discount my time and do it for less
than posted rate. Otherwise, they run to their favorite discounter
and just start over with a new machine. Same with some low end
entertainment electronics. It's even worse with hardware. I can
easily fix a typical PC power supply for a few dollars in parts and
about 1.2 billable hours. However, who's going to pay me $100 to fix
a $25 power supply?

What's needed is some assistance from the manufacturer. Schematics,
test points, easily available parts, troubeshooting info, easy access,
diagnostics, etc will all reduce the amount of time I burn fixing
something, which translates to a lower cost repair.

--
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

== 4 of 4 ==
Date: Tues, Nov 16 2010 11:19 pm
From: Jeff Liebermann

On Tue, 16 Nov 2010 09:08:37 +1100, Franc Zabkar
<fzabkar@iinternode.on.net> wrote:
>I'm posting this on a 12 year old, socket 7,
>Windows 98 machine.
>- Franc Zabkar

I call those Zombies. They're ugly, slowly shuffle through the
office, and are quite brainless. I have a 486DX2/66 running SCO Unix
3.2v4.2, but that's only because it refuses to die, and I'm too lazy
to replace it with a more modern Linux server. I also have a
collection of quite usable 1970's and 1980's vintage test equipment:
<http://802.11junk.com/jeffl/pics/home/slides/lab.html>
but only because the stuff works and I find not compelling reason to
upgrade. (Yes, that's a Nixie tube counter on top of the spectrum
analyzer). What you don't see in the photo is a rather large pile of
broken test equipment waiting for me to get inspired to fix. The good
news is that most test equipment is made to be repaired (except for
some TMS series Tek scopes where I bought before I researched).

Anyway, this isn't about retro enthusiast, hobbyist repairmen, or
tightwads (like me). It's about manufacturers not creating artificial
obstacles to repair for those that want to keep their toys running.

--
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

==============================================================================
TOPIC: Google Voice App Comes To iPhone
http://groups.google.com/group/sci.electronics.repair/t/ca9b255ff50c66e9?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Nov 16 2010 9:39 pm
From: sunitha frnd

Google Voice has finally been launched as an iPhone app. Following a
lengthy dispute with Apple that drew the attention of US government
telecom regulators, Google has announced the availability of Google
Voice for download from Apple's App Store. Earlier this year, the
company launched a Google Voice HTML5 Web app for iPhone users.

Google submitted its iPhone app in June 2009. Google Voice for iPhone
is available to download from the Apple App Store today.

http://t.co/S51vs4U

==============================================================================
TOPIC: Shure M105E phono cartridge
http://groups.google.com/group/sci.electronics.repair/t/4f8b232551a3984f?hl=en
==============================================================================

== 1 of 2 ==
Date: Tues, Nov 16 2010 10:48 pm
From: "Wild_Bill"

Rewinding the cartridge coil(s) with wire saved from old, disassembled tape
recorder heads.

--
Cheers,
WB
.............

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4ce31382$0$2548$822641b3@news.adtechcomputers.com...
> On 11/16/2010 2:41 PM Tim Schwartz spake thus:
>
>> I've got a customer's turntable here with a Shure M105E p-mount
>> cartridge in it. The stylus is fine, but the cartridge itself has an
>> open winding. I've seen this in Audio Technica and Grado cartridges over
>> the years, but never before in a Shure. Any chance you've got a good
>> body without a stylus you'd part with? (In the USA preferred. I'll
>> gladly pay shipping.)
>
> Cue N. Cook with nonsense about opening up cartridge and repairing open
> winding ... or at least endless speculation about *why* it failed ...
>
>
> --
> 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)

== 2 of 2 ==
Date: Wed, Nov 17 2010 12:23 am
From: "N_Cook"

David Nebenzahl <nobody@but.us.chickens> wrote in message
news:4ce31382$0$2548$822641b3@news.adtechcomputers.com...
> On 11/16/2010 2:41 PM Tim Schwartz spake thus:
>
> > I've got a customer's turntable here with a Shure M105E p-mount
> > cartridge in it. The stylus is fine, but the cartridge itself has an
> > open winding. I've seen this in Audio Technica and Grado cartridges
> > over the years, but never before in a Shure. Any chance you've got a
> > good body without a stylus you'd part with? (In the USA preferred. I'll
> > gladly pay shipping.)
>
> Cue N. Cook with nonsense about opening up cartridge and repairing open
> winding ... or at least endless speculation about *why* it failed ...
>
>
> --
> 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)

False , I've never opened a magnetic cartridge. Only crystal cartridges ,
where the crystal is hygroscopic in the damp UK and does not survive 40
years and that includes NOS of course. They revert to paste or powder.
Matter of replacing with piezo-ceramic transducer

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