Digest for sci.electronics.repair@googlegroups.com - 21 updates in 3 topics

ohger1s@gmail.com: Oct 10 09:25AM -0700

On Saturday, October 8, 2016 at 6:50:57 PM UTC-4, Roger Blake wrote:
> Don't talk to cops! -- http://www.DontTalkToCops.com
> Badges don't grant extra rights -- http://www.CopBlock.org
> -----------------------------------------------------------------------------
 
Sounds like the knock-off brands of TV Homer Simpson was shopping for, including Magnetbox and Panaphonics.
Paul <nospam@needed.invalid>: Oct 09 09:50PM -0400

Ken Blake wrote:
 
>> I am aware my news reader does it but have not have the time to change it.
 
> It has very little to do with your newsreader. Regardless of where
> the newsreader puts the cursor, you can move it yourself.
 
Outlook Express can use OEQuoteFix. It's possible
that third-party thing can make OE a good citizen.
 
http://home.in.tum.de/~jain/software/oe-quotefix/
 
Paul
"Andy" <N@n.com>: Oct 10 02:33AM -0400

I was told it's in my news reader settings ken so ill change it when i get
time :)
 
 
--
AL'S COMPUTERS
"Ken Blake" <Ken@invalid.news.com> wrote in message
news:o1lkvbh3v3b5acncjgl9nse7cknamda9jt@4ax.com...
 
>I am aware my news reader does it but have not have the time to change it.
 
 
It has very little to do with your newsreader. Regardless of where
the newsreader puts the cursor, you can move it yourself.
"Andy" <N@n.com>: Oct 10 02:33AM -0400

Thank you ill look in to it
 
 
--
AL'S COMPUTERS
"Paul" <nospam@needed.invalid> wrote in message
news:ntes4r$d5r$2@dont-email.me...
Tom Gardner <spamjunk@blueyonder.co.uk>: Oct 10 08:52AM +0100

On 10/10/16 07:33, Andy wrote:
> I was told it's in my news reader settings ken so ill change it when i get
> time :)
 
I'm sorry to read you are "so ill".
 
If that prevents you from using the down-arrow
key, I hope you get better soon.
"Andy" <N@n.com>: Oct 10 04:42AM -0400

I make mistakes TOM are you prefect?
 
 
--
AL'S COMPUTERS
"Tom Gardner" <spamjunk@blueyonder.co.uk> wrote in message
news:kNHKz.493901$%E.252679@fx39.am4...
Tom Gardner <spamjunk@blueyonder.co.uk>: Oct 10 10:19AM +0100

On 10/10/16 09:42, Andy wrote:
> I make mistakes TOM are you prefect?
 
I tried to convince my daughter I was, but she
didn't believe it.
 
As a separate point, top-posting and putting the context
(i.e. my response to your previous message) below your
.sig (i.e. after the "--" line) meant that my newsreader
chopped the context when creating this message. Yes, I
could have manually re-inserted it, but I couldn't be
bothered. Another reason top-posting is disliked.
Ken Blake <Ken@invalid.news.com>: Oct 10 08:45AM -0700

On Sun, 09 Oct 2016 21:50:38 -0400, Paul <nospam@needed.invalid>
wrote:
 
>> the newsreader puts the cursor, you can move it yourself.
 
>Outlook Express can use OEQuoteFix. It's possible
>that third-party thing can make OE a good citizen.
 
 
 
Yes, I know. Back in the days when I used Outlook Express, I used to
use OEQuoteFix.
 
But my point was that although even though something like OEQuoteFix
can make it easier, it isn't necessary. You can still put your reply
anywhere you want before, after, or within the quoted text.
Ken Blake <Ken@invalid.news.com>: Oct 10 08:50AM -0700


>I was told it's in my news reader settings ken so ill change it when i get
>time :)
 
 
Two points:
 
1. You apparently use Outlook Express, and what you were told is
wrong. There's no way to change where Outlook Express puts the cursor
in a reply.
 
2. This is a slightly expanded repeat of what I said earlier:
regardless of where Outlook Express, or any other newsreader, puts the
cursor, it's very easy to move it wherever you want it. To bottom
post, simply click at the bottom of the message and the reply cursor
will move there.
Mark Lloyd <not@mail.invalid>: Oct 10 11:20AM -0500

On 10/10/2016 01:33 AM, Andy wrote:
> I was told it's in my news reader settings ken so ill change it when i get
> time :)
 
One thing I learned quickly the first time I used a a GUI was to select
where typed text would go (click or use the tab key, etc). I didn't
notice the problem with OE (over a decade ago, when I used OE).
 
--
76 days until the winter celebration (Sunday December 25, 2016 12:00:00
AM for 1 day).
 
Mark Lloyd
http://notstupid.us/
 
"Have you noticed there are no interesting people in heaven? --Just a
hint to the girls as to where they can find their salvation." [Nietzche,
"The Will to Power"]
Stephen Wolstenholme <steve@easynn.com>: Oct 10 01:25PM +0100

A friend has a disabled buggy for short distance trips. It is supposed
to do 25 to 30 miles on fully charged batteries. Last week it stopped
dead after about 10 miles. It was retrieved by the insurance company
and taken to the workshop for repair. A fuse had blown and so both
batteries needed replacing. Can anyone explain how a fuse blowing
results in the batteries needing to be replaced. They are sealed lead
acid batteries.
 
Any ideas?
 
Steve
 
--
Neural Network Software for Windows http://www.npsnn.com
Pat <pat@nospam.us>: Oct 10 08:55AM -0400

On Mon, 10 Oct 2016 13:25:23 +0100, Stephen Wolstenholme
>acid batteries.
 
>Any ideas?
 
>Steve
 
My guess is that it's the other way around. The bad batteries
(voltage lower than spec due to bad cells) caused the electronic
controller to draw too much current in an attempt to maintain speed.
That's just a guess, though. It is hard disagnose something with no
information. It is also possible they replace the batteries whenever
they do any other repair to avoid another trip to the shop as the
batetries reach end-of-life.
Stephen Wolstenholme <steve@easynn.com>: Oct 10 02:18PM +0100

>information. It is also possible they replace the batteries whenever
>they do any other repair to avoid another trip to the shop as the
>batetries reach end-of-life.
 
The batteries were brand new about two months old!
 
Steve
 
--
Neural Network Software for Windows http://www.npsnn.com
Stephen Wolstenholme <steve@easynn.com>: Oct 10 02:21PM +0100

On Mon, 10 Oct 2016 14:18:27 +0100, Stephen Wolstenholme
>>batetries reach end-of-life.
 
>The batteries were brand new about two months old!
 
>Steve
 
I should have typed "two months ago!"
 
Steve
 
--
Neural Network Software for Windows http://www.npsnn.com
"pfjw@aol.com" <pfjw@aol.com>: Oct 10 06:26AM -0700

Sealed Lead-Acid batteries Do Not like to be run dead. Ideally, they never should drop below 50% of capacity before being recharged.
 
Now, we get into hype and sales pitches. The "Advertised" range of these little go-buggies is how far they will go downhill, with a tailwind, carrying a 30 pound load after a full charge on a cool day. The actual safe range is about 1/2 of that, 2/3 once in a great while. Otherwise, the battery sulfates - and dies.
 
Fuses are not voltage-dependent devices, but current dependent. So, as the battery starts to drop, and the regulator pulls more and more current (at a lower voltage) to the motors, the motors will start to overheat. And eventually the fuse(s) will blow to prevent damage to the motors.
 
http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it
 
Peter Wieck
Melrose Park, PA
Chris Jones <lugnut808@spam.yahoo.com>: Oct 11 12:55AM +1100

> current (at a lower voltage) to the motors, the motors will start to
> overheat. And eventually the fuse(s) will blow to prevent damage to
> the motors.
 
That could happen if the motor controller is very crude, but a good
motor controller would incorporate current limiting, and the current
limit should be set below the fuse blowing current.
Chris Jones <lugnut808@spam.yahoo.com>: Oct 11 01:16AM +1100

On 10/10/2016 23:25, Stephen Wolstenholme wrote:
> results in the batteries needing to be replaced. They are sealed lead
> acid batteries.
 
> Any ideas?
 
Would the workshop receive more money if they decide that the batteries
need replacing, even if the batteries are ok? Changing the batteries
would be a quick and simple job involving very little labour or
knowledge, and the mark-up on the replacement batteries might be quite
large. That might be one explanation why the workshop decided to replace
them.
 
In fairness to the workshop, many people abuse batteries without mercy,
running them into deep discharge and then leaving them to sulfate, or
making them boiling hot with heavy currents for long durations.
Determining with certainty whether the batteries are just a bit flat or
have been damaged through abuse may be a very time-consuming job and
require much experience and knowledge, and if the batteries are found to
be good, then it would likely be unprofitable also. They may also be
uncertain about the condition of the batteries, and may fear that they
would make the customer unhappy if the batteries are bad and they don't
replace them.
 
The workshop may even think that performing an unnecessary battery
replacement is a way of doing the owner a favour, if an insurance
company is paying.
 
The fact that the batteries were able to blow the fuse is if anything a
sign that they might be in good health. A really knackered battery might
not be able to produce enough current to blow the fuse, depending on the
fuse rating.
 
If the owner is allowed to hang onto the old batteries then that would
be nice, but I expect the workshop wants to sell them for the scrap
value. In the event that the problem happens again with the new
batteries, that will show that it was some other problem.
"pfjw@aol.com" <pfjw@aol.com>: Oct 10 07:55AM -0700

On Monday, October 10, 2016 at 9:55:49 AM UTC-4, Chris Jones wrote:
 
> That could happen if the motor controller is very crude, but a good
> motor controller would incorporate current limiting, and the current
> limit should be set below the fuse blowing current.
 
Bluntly, I would be surprised if the motor controller is anything more than a primitive SCR speed control and a fuse as a last-resort. These go-buggies are just short of a racket, with a very few genuine exceptions. And a brush-type DC motor will pull current even when not turning right down to a dead-short when the voltage drops below what is necessary to turn the motor against the load - and THAT is what blows the fuse.
 
Peter Wieck
Melrose Park, PA
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Oct 10 11:06AM -0400

> turning right down to a dead-short when the voltage drops below what
> is necessary to turn the motor against the load - and THAT is what
> blows the fuse.
 
Torque is proportional to current, no?
 
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
"pfjw@aol.com" <pfjw@aol.com>: Oct 10 08:21AM -0700

On Monday, October 10, 2016 at 11:06:50 AM UTC-4, Phil Hobbs wrote:
 
> Torque is proportional to current, no?
 
Yep. But a DC motor dead-stopped is a short circuit. And even a very nearly crapped-out battery may have enough to blow a fuse if dead-shorted. Fuse action is not voltage dependent (as long as the fuse is rated at a higher voltage than the application).
 
Peter Wieck
Melrose Park, PA
Look165 <look165@numericable.fr>: Oct 10 05:25PM +0200

The first question : which fuse blows ?
 
Stephen Wolstenholme a écrit :
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