sci.electronics.repair@googlegroups.com

Today's topics:

* Batteries That Do Not Leak w/Age? - 6 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/fd55784ea36aafe5?hl=en
* Learning Electrical Repair - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/b65ce2f782c18000?hl=en
* Output transformer ambiguity - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/b4d4e3e6c8232295?hl=en

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TOPIC: Batteries That Do Not Leak w/Age?
http://groups.google.com/group/sci.electronics.repair/t/fd55784ea36aafe5?hl=en
==============================================================================

== 1 of 6 ==
Date: Fri, Nov 26 2010 8:23 pm
From: Allodoxaphobia

On Fri, 26 Nov 2010 21:01:43 -0500, (PeteCresswell) wrote:
> Is there any such thing as an alkaline battery that does not leak
> with age?
>
> I just had my second episode of Mallory Duracells gooping up a
> flashlight.
>
> If the answer is "no", can anybody venture a proactive
> replacement interval for size "C" cells?

And, can anyone suggest a good technique to extract bad, swollen
"C" batteries (accumulators) out of a Mag-Lite flashlight (torch)?

Lately I've been thinking "a good old fashioned cork-screw!"

The flashlight (torch) looks ok otherwise...

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
* Killfiling google & XXXXbanter.com: jonz.net/ng.htm

== 2 of 6 ==
Date: Fri, Nov 26 2010 8:45 pm
From: "tm"

"Allodoxaphobia" <knock_yourself_out@example.net> wrote in message
news:slrnif11up.2u16.knock_yourself_out@shell.config.com...
> On Fri, 26 Nov 2010 21:01:43 -0500, (PeteCresswell) wrote:
>> Is there any such thing as an alkaline battery that does not leak
>> with age?
>>
>> I just had my second episode of Mallory Duracells gooping up a
>> flashlight.
>>
>> If the answer is "no", can anybody venture a proactive
>> replacement interval for size "C" cells?
>
> And, can anyone suggest a good technique to extract bad, swollen
> "C" batteries (accumulators) out of a Mag-Lite flashlight (torch)?
>
> Lately I've been thinking "a good old fashioned cork-screw!"
>
> The flashlight (torch) looks ok otherwise...
>
> Jonesy

I use a course 4.5 inch deck screw and vise grips. Some PB Blaster sprayed
in first and allow to soak.

== 3 of 6 ==
Date: Fri, Nov 26 2010 8:52 pm
From: D Yuniskis

Allodoxaphobia wrote:
> On Fri, 26 Nov 2010 21:01:43 -0500, (PeteCresswell) wrote:
>> Is there any such thing as an alkaline battery that does not leak
>> with age?
>>
>> I just had my second episode of Mallory Duracells gooping up a
>> flashlight.
>>
>> If the answer is "no", can anybody venture a proactive
>> replacement interval for size "C" cells?
>
> And, can anyone suggest a good technique to extract bad, swollen
> "C" batteries (accumulators) out of a Mag-Lite flashlight (torch)?
>
> Lately I've been thinking "a good old fashioned cork-screw!"
>
> The flashlight (torch) looks ok otherwise...

I recently had to extract AA size cells from such a flashlight.
I found a twist drill (sized a bit smaller than the cell dia.)
worked effectively (use a drill press if you don't have a steady
hand as going in "off axis" will damage the flashlight).

Dental instruments are handy for fishing out the remnants of
the "gored" cells.

(N.B. watch your penetration lest you drill past the "frontmost"
cell and into the mechanism itself!)

HTH,
--don

== 4 of 6 ==
Date: Fri, Nov 26 2010 11:00 pm
From: "Trevor Wilson"

(PeteCresswell) wrote:
> Is there any such thing as an alkaline battery that does not leak
> with age?
>
> I just had my second episode of Mallory Duracells gooping up a
> flashlight.
>
> If the answer is "no", can anybody venture a proactive
> replacement interval for size "C" cells?

**Yep, although the answer is probably not going to help you all that much.
Back in 1986, I purchased a JVC TV set. The remote control came fitted with
three JVC branded alkaline batteries (AA size). I finally handed the set
over to a family member back in 2000. I figured I should check the
batteries, even though the remote worked fine. Sure enough, the batteries
weren't leaking, but the cell Volts had fallen to less than 1 Volt in each.
A new set of cells and I handed the set over.

JVC alkalines rule!

I've never seen another JVC branded alkaline.

--
Trevor Wilson
www.rageaudio.com.au

== 5 of 6 ==
Date: Fri, Nov 26 2010 11:02 pm
From: Jeff Liebermann

On Fri, 26 Nov 2010 21:01:43 -0500, "(PeteCresswell)" <x@y.Invalid>
wrote:

>Is there any such thing as an alkaline battery that does not leak
>with age?

Yes.
<http://gadgets.softpedia.com/news/New-Hitachi-Maxell-Alkaline-Batteries-Touted-As-Leak-Proof-789-01.html>
However, I have no experience with these. I've been wrapping my
flashlight batteries in cellophane wrap for years. I have had leaks,
but little damage.

>I just had my second episode of Mallory Duracells gooping up a
>flashlight.

How old were the batteries?

>If the answer is "no", can anybody venture a proactive
>replacement interval for size "C" cells?

5 years would be my guess. The ideal self discharge rate of about 2%
for alkalines should leave you with a 90% charge after 5 years.
However, getting the battery hot, as in your vehicle (or bicycle),
will rapidly decrease the self discharge rate. When the battery gets
nearly dead (at about 25% capacity), it starts to belch hydrogen,
which is the major cause of leakage.

--
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

== 6 of 6 ==
Date: Fri, Nov 26 2010 11:10 pm
From: Jeff Liebermann

On 27 Nov 2010 04:23:53 GMT, Allodoxaphobia
<knock_yourself_out@example.net> wrote:

>And, can anyone suggest a good technique to extract bad, swollen
>"C" batteries (accumulators) out of a Mag-Lite flashlight (torch)?

Maglite flashlights all have screw on caps at both ends of the
flashlight. Unscrew both ends, lubricate, and beat on the battery
with a wooden dowel and hammer.
<http://www.maglite.com/anatomy.asp>
Maglite flashlights are not warrantied for battery leakage. However,
they do have an arrangement with some battery manufactories to replace
your Maglite at their expense. See bottom of:
<http://www.maglite.com/faq_details.asp?faqProd=D>

--
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: Learning Electrical Repair
http://groups.google.com/group/sci.electronics.repair/t/b65ce2f782c18000?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Nov 26 2010 9:37 pm
From: F Murtz

Wild_Bill wrote:
> There are at least a couple of companies that still sell electronic kits
> for hobbiests/enthusiasts.
>
> Velleman has small kits, but nothing of the same scale as the old
> Heathkit equipment.
> http://www.vellemanusa.com/us/enu/product/list/?id=523008
>
> I believe I saw another brand name of small kits available on eBay
> recently, but don't remember the name.
>
> Down under, the Dick Smith electronics company may still be selling kits.
>
> I've seen soldering kits available for practicing/learning the skill of
> soldering.. and there are probably DVD video instructions for beginners
> interested in learning how to solder.
>
> Some of those instructable/DIY websites have some dangerous techniques
> that beginners should definitely stay away from.. the line voltage
> powered nicad zapper is one example of one of the hazardous procedures
> I've seen.
>
> There may be some worthwhile youtube videos, but steady cameras and good
> clean audio don't seem to be the norm there.
> Finding or buying some actual commercially-made soldering tutorial
> videos would be best, IMO
>
> --
> Cheers,
> WB
> .............
>
>
> "William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
> news:icg895$2l2$1@news.eternal-september.org...
>> It's a shame there are no major manufacturers of electronic kits,
>> which is a
>> good way to get started (assuming you know how to solder!).
>>
>> Try Googling "electronic kits for adults".
>>
>> You might get one of those "100-in-one" lab-experiment kits and have some
>> fun with it. None requires soldering.
>>
>>
>>
>
Jaycar sells many kits in Australia.

==============================================================================
TOPIC: Output transformer ambiguity
http://groups.google.com/group/sci.electronics.repair/t/b4d4e3e6c8232295?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Nov 27 2010 12:41 am
From: "N_Cook"

I would go for shorted turns on the "900" ohm one especially if heating and
knocking fails to show any variation. Shorted turns tend to be "welded"
together . I only have test data for the EL80 but 25mA per pentode and
looking at some Premier Tx data for range of use 7 watt to 60W, DC of HT
side ranging from 1500 to 16000 ohm so 4000 ohm seems more likely.
What is the physical dimensions of your ones?

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