Digest for sci.electronics.repair@googlegroups.com - 19 updates in 4 topics

kgmoates@gmail.com: Aug 11 09:11AM -0700

On Monday, March 24, 2014 at 10:34:35 AM UTC-4, KenO wrote:
 
> Can send photos if any interest.
 
> Thanks
 
> Ken
 
The listed link is a ransom-ware TRAP
John Robertson <spam@flippers.com>: Aug 10 02:48PM -0700


> KillDozer.
 
> Peter Wieck
> Melrose Park, PA
 
That was movie, this was a short Sci-Fi story whose name & Author I
can't recall. I now think that it was from the 40s.
 
I recall hearing about KillDozer but never saw the movie...
 
John :-#)#
"pfjw@aol.com" <pfjw@aol.com>: Aug 11 04:09AM -0700

On Thursday, August 10, 2017 at 5:48:24 PM UTC-4, John Robertson wrote:
 
> can't recall. I now think that it was from the 40s.
 
> I recall hearing about KillDozer but never saw the movie...
 
> John :-#)#
 
Theodore Sturgeon. Short Story, same name, and the basis of the movie.
 
https://en.wikipedia.org/wiki/Killdozer!_(short_story)
 
Peter Wieck
Melrose Park, PA
John Robertson <spam@flippers.com>: Aug 11 08:19AM -0700


> https://en.wikipedia.org/wiki/Killdozer!_(short_story)
 
> Peter Wieck
> Melrose Park, PA
 
Nope, not that story.
 
This had toasters, cars, buses all becoming 'aware' and deciding to
destroy the enemy (humans). Perhaps KillDozer was based on the original
story. It (the original short story) is buried in my books that are
still boxed up when I moved houses five years ago. Possibly written by a
one-time author.
 
There are never enough bookshelves!
 
John :-#(#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
"pfjw@aol.com" <pfjw@aol.com>: Aug 11 08:58AM -0700

On Friday, August 11, 2017 at 11:19:22 AM UTC-4, John Robertson wrote:
 
 
> Nope, not that story.
 
hmmmm... that might be "Skirmish" by Clifford Simak.
 
http://prosperosisle.org/spip.php?article259
Ralph Mowery <rmowery28146@earthlink.net>: Aug 10 01:14PM -0400

In article <d2vooc5d4lth7elu6kiavcpeig5g11lmt4@4ax.com>,
jeffl@cruzio.com says...
> <http://www.archersecuritygroup.com/tell-real-apple-charger-fake-life-may-depend/>
 
> The real chargers:
> <https://www.apple.com/power-adapters/>
 
It looks like Apple used a lot of engineering just to charge a battery.
From the writeup, the Apple charger does not seem to rate much if any
better than many of the fakes.
rickman <gnuarm@gmail.com>: Aug 10 01:50PM -0400

Ralph Mowery wrote on 8/10/2017 1:14 PM:
 
> It looks like Apple used a lot of engineering just to charge a battery.
> From the writeup, the Apple charger does not seem to rate much if any
> better than many of the fakes.
 
Ya know, battery charging is not rocket science.
 
--
 
Rick C
Jeff Liebermann <jeffl@cruzio.com>: Aug 10 11:15AM -0700

On Thu, 10 Aug 2017 13:14:07 -0400, Ralph Mowery
 
>It looks like Apple used a lot of engineering just to charge a battery.
>From the writeup, the Apple charger does not seem to rate much if any
>better than many of the fakes.
 
Whether an Apple charger represents a quality device is not the issue
or the problem. It's whether the chargers in question are safe to
operate and meet the various safety specifications. Much of the extra
circuitry in an Apple charger is required to comply with power factor
correction (on the larger chargers), power line isolation, overload
protection, efficiency requirements, operating temperature range,
EMI/RFI, electromagnetic compatibility, etc. Every single logo on the
(larger) serial number labels represent an expensive certification
test.
 
Anyone can easily design a usable charger by simply copying the
recommended circuit on the data sheet. Making one that's safe,
rugged, customer proof, and passes the necessary tests, is another
story.
 
In my never humble opinion, Apple chargers are designed to survive
about 5-7 years under normal use, after which they mechanically fall
apart. There are no concessions to reparability or long life. At
best, they are nice looking, overpriced, throw-away products. However,
I'm fairly sure that a genuine Apple charger is unlikely to
electrocute me or set my house on fire, which is something I cannot
say about the counterfeits.
 
--
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
John-Del <ohger1s@gmail.com>: Aug 10 12:15PM -0700

On Wednesday, August 9, 2017 at 1:08:32 PM UTC-4, Samuel M. Goldwasser wrote:
 
> http://www.repairfaq.org/sam/audiofaq.htm#audipcrhg
 
> Comments welcome.
 
None except nice to see you posting and hope all is well Sam.
sam@repairfaq.org (Samuel M. Goldwasser): Aug 10 03:58PM -0400

> and model number.
 
> You might want to get a scale, record the weights, and add them to
> your chart.
 
There's mention on at least one Web site (and in the writeup) about the
fakers adding iron blocks to make up the weight.
 
X-rays will tell. ;-)
 
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
 
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
sam@repairfaq.org (Samuel M. Goldwasser): Aug 10 04:01PM -0400

>> From the writeup, the Apple charger does not seem to rate much if any
>> better than many of the fakes.
 
> Ya know, battery charging is not rocket science.
 
Technically, these aren't even battery chargers. They are constant
voltage DC power supplies, period. Or should be if designed properly. The
charge controller is in the device (or battery).
 
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
 
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
Ralph Mowery <rmowery28146@earthlink.net>: Aug 10 04:02PM -0400

In article <1s7pochq7jqk9v1kt0ui09b23eg4nl5hi4@4ax.com>,
jeffl@cruzio.com says...
> I'm fairly sure that a genuine Apple charger is unlikely to
> electrocute me or set my house on fire, which is something I cannot
> say about the counterfeits.
 
I agree with you , but even brand names have their problems. The
Samsung is a well known brand and their cell phones would burn up.
 
Other well known brands have had their problems.
rickman <gnuarm@gmail.com>: Aug 10 04:39PM -0400

Ralph Mowery wrote on 8/10/2017 4:02 PM:
 
> I agree with you , but even brand names have their problems. The
> Samsung is a well known brand and their cell phones would burn up.
 
> Other well known brands have had their problems.
 
A *lot* less often and when they do have problems they own up to it and
recall them. You won't see any of the cheap models recalling products.
 
--
 
Rick C
Jeff Liebermann <jeffl@cruzio.com>: Aug 10 07:45PM -0700

On Thu, 10 Aug 2017 15:58:48 -0400, sam@repairfaq.org (Samuel M.
Goldwasser) wrote:
 
>There's mention on at least one Web site (and in the writeup) about the
>fakers adding iron blocks to make up the weight.
 
I haven't seen iron blocks, but have seen sand inside one 18650 cell.
The owner didn't want me to take it apart for some reason, but I could
feel and hear the sand when I shook the cell. However, they added too
much sand and instead of the usual 44-49 gram weight (for unprotected
cells), it weighed about 60 grams. My guess(tm) is that they thought
buyers would think they were getting more for their money if it were
heavier. I just weighed a few known fake 18650 cells (Trustfire, GTL,
Ultrafire, SkyWolfEye, etc). Most weighed 33-35 grams. One older
Ultrafire "BCR-18650" weighed 47 grams. My guess is that it dates
from the days when Ultrafire was a legitimate brand name.
 
>X-rays will tell. ;-)
 
Yes, unless the bad guys add a sheet of lead foil inside the power
supply as "shielding".
 
More...
 
USB power supplies and chargers:
<http://www.lygte-info.dk/info/indexUSB%20UK.html>
 
Index of tested USB power supplies/chargers:
<http://lygte-info.dk/info/ChargerIndex%20UK.html>
(Note the column in the chart on safety).
 
Test results on various supplies/chargers:
<http://www.lygte-info.dk/info/usbPowerSupplyTest%20UK.html>
 
How does a USB charger work:
<http://lygte-info.dk/info/SMPS%20workings%20UK.html>
 
--
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 10 08:29PM -0700

On Thu, 10 Aug 2017 16:02:08 -0400, Ralph Mowery
>> say about the counterfeits.
 
>I agree with you , but even brand names have their problems. The
>Samsung is a well known brand and their cell phones would burn up.
 
My current smartphone is a Samsung S6. I guess I should buy a pocket
fire extinguisher in case my phone catches fire.
<https://www.google.com/search?q=pocket+fire+extinguisher&tbm=isch>
Soon, everyone will be carrying pocket fire extinguishers.
 
Most manufacturers of laptops, smartphones, and cell phones have had
problems with older LiPo batteries. These would bulge, which is
normal during a fast charge cycle, which was most irritating, but
allegedly not considered hazardous. A few phones did catch fire,
which attracted media attention. However, what finally got their
attention was the large number of YouTube videos showing what happens
when someone pounds a nail into a LiPo battery pack. The result was
the general addition of a BMS (battery management system) designed to
protect the battery pack against over charge (above 4.2V), excessive
discharge current, and discharge below about 2.8V. That was
sufficient to reduce the number of spontaneous fires.
 
However, that didn't stop the problems at the manufacturing end. Sony
had a huge recall of laptop battery packs for leaving scrap metal
inside the cell which could eventually puncture the insulating
separator and start a fire. Samsung had a similar problem with two
generations of batteries in the S7.
<http://www.techradar.com/news/samsung-galaxy-note-7-battery-fires-heres-why-they-exploded>
 
Ok, so much for batteries. However, we're talking about power
supplies, not batteries. We're also talking about a fairly small
number of smartphone batteries that caught fire. I'm too lazy to
calculate the odds, but I suspect you're safer carrying a Samsung S7
than you are trying to talk on your phone while charging it with
counterfeit Apple power supply charger. For a smoking battery, the
risks are statistical. For a counterfeit charger with insufficient AC
line isolation, their situational.
 
>Other well known brands have had their problems.
 
The Sony laptop battery recall affected almost every major laptop
manufacturer and a huge number of laptop batteries in 2006:
<https://www.engadget.com/2006/10/19/sony-battery-recall-approaches-10-million-costs-mounting/>
When Sony laptops switched to Panasonic batteries, it happened again
in 2013:
<https://www.laptopmag.com/articles/sony-vaio-batteries-recalled>
 
Apple had problems with some of their power supplies:
<https://www.apple.com/support/usbadapter-european/>
<https://www.apple.com/support/usbadapter/exchangeprogram/>
<https://www.apple.com/support/ac-wallplug-adapter/>
<https://www.apple.com/support/usbadapter-takeback/>
<https://support.apple.com/en-us/HT204551>
Seen any recalls of counterfeit power supplies and chargers?
 
 
 
 
 
--
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
knobbler1@gmail.com: Aug 10 10:56AM -0700

Hi everyone, I'm new here and I'm wondering if anyone has a copy of the operating and or the service manual for this signal generator at all? I just picked this up on Ebay and in its day it was a top end piece of kit selling 35 years ago for £750 . Sadly though it needs a little TLC as the FM part of it seems to be working just fine but the AM, works when it feels like it.
 
It has a nice little LED display for the range and frequency read out in Mhz but most of the time when AM is selected it displays all zeros, with the occasional burst of life.
 
So can anyone tell me where I can obtain copies of these manuals at all? The manufacturers no longer have any records etc on these as they stopped production years ago and now produce special climatic testing cabinets.
 
Thanks
 
Graham
Jeff Liebermann <jeffl@cruzio.com>: Aug 10 11:21AM -0700

On Thu, 10 Aug 2017 10:56:26 -0700 (PDT), knobbler1@gmail.com wrote:
(...)
 
No manual, but this might help.
<https://www.eevblog.com/forum/testgear/brand-name-i-never-heard-of-before/>
 
--
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
N_Cook <diverse@tcp.co.uk>: Aug 10 07:58PM +0100


> So can anyone tell me where I can obtain copies of these manuals at all? The manufacturers no longer have any records etc on these as they stopped production years ago and now produce special climatic testing cabinets.
 
> Thanks
 
> Graham
 
Sharetree is a new name to me, decades of UK test kit involvement.
"Style" looks rather kit-form. Reminds me of the South African brand
Sabtronics around in the UK then , in the same sort of general purpose
case and simple typography and exposed bulkhead connectors
tabbypurr@gmail.com: Aug 10 03:49PM -0700


> So can anyone tell me where I can obtain copies of these manuals at all? The manufacturers no longer have any records etc on these as they stopped production years ago and now produce special climatic testing cabinets.
 
> Thanks
 
> Graham
 
Time to start prodding it.
 
 
NT
You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page.
To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com.

No Response to "Digest for sci.electronics.repair@googlegroups.com - 19 updates in 4 topics"

Post a Comment