sci.electronics.repair@googlegroups.com

Today's topics:

* OT Re: CFLs - retrofitting low ESR capacitors - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/4b33f31f667954a0?hl=en
* Sherwood RX-5502 Receiver Protection Shutdown, Repair, thoughts wanted... -
2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/ba9b4799ea243157?hl=en
* Store that sells ceiling fan capacitors? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/4792acac41b3eaae?hl=en
* Type of ceramic wirewound resistor? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/24e3fe2e41d78acc?hl=en

==============================================================================
TOPIC: OT Re: CFLs - retrofitting low ESR capacitors
http://groups.google.com/group/sci.electronics.repair/t/4b33f31f667954a0?hl=en
==============================================================================

== 1 of 3 ==
Date: Wed, Oct 12 2011 6:57 pm
From: Trevor Wilson

On 10/13/2011 12:50 PM, Arfa Daily wrote:
>
>>
>> **I argue with my mother regularly. She knows not to bring up the
>> topic of her religious beliefs in my prescence. I will not tolerate
>> such nonsense. She is also rapidly learning that when she attempts to
>> argue that the planet is not warming, that she will be sharply
>> rebuked. Sadly, parents reach a point where they need to be treated
>> like children.
>>
>> --
>> Trevor Wilson
>> www.rageaudio.com.au
>>
>>
>
> Well, all I can say is that I hope my children never end up treating me
> with such disrespect as you clearly have for your parents, or having
> such dogged intolerance of the beliefs of others ... :-(

**Again, this is well and truly off topic. I have no issue for the
sacrifices that my parents made for me, nor the values that they
instilled in me. I was raised to be free to express my opinions and
beliefs at all times. Family dinners often resulted in robust
discussions. Particularly, since both my parents shared different
political views to mine. At all times, we conducted such discussions
without rancour and with respect for the views of the opponent. Not the
issue. When we discuss science, my mother is ignorant of the facts. She
lacks the education and the critical thinking required. I remind her of
that.

--
Trevor Wilson
www.rageaudio.com.au

== 2 of 3 ==
Date: Wed, Oct 12 2011 7:46 pm
From: atec77

On 13/10/2011 11:50 AM, Arfa Daily wrote:
>
>>
>> **I argue with my mother regularly. She knows not to bring up the
>> topic of her religious beliefs in my prescence. I will not tolerate
>> such nonsense. She is also rapidly learning that when she attempts to
>> argue that the planet is not warming, that she will be sharply
>> rebuked. Sadly, parents reach a point where they need to be treated
>> like children.
>>
>> --
>> Trevor Wilson
>> www.rageaudio.com.au
>>
>>
>
> Well, all I can say is that I hope my children never end up treating me
> with such disrespect as you clearly have for your parents, or having
> such dogged intolerance of the beliefs of others ... :-(
>
> Arfa
Summed up in very few words in fact quite accurately
a disrespectful know-nothing wannbe

--
X-No-Archive: Yes

== 3 of 3 ==
Date: Wed, Oct 12 2011 8:08 pm
From: kym@kymhorsell.com

In aus.electronics atec77 <atec77@hotmail.com> wrote:
> On 13/10/2011 11:50 AM, Arfa Daily wrote:
>>> **I argue with my mother regularly. She knows not to bring up the
>>> topic of her religious beliefs in my prescence. I will not tolerate
>>> such nonsense. She is also rapidly learning that when she attempts to
>>> argue that the planet is not warming, that she will be sharply
>>> rebuked. Sadly, parents reach a point where they need to be treated
>>> like children.
...
>> Well, all I can say is that I hope my children never end up treating me
>> with such disrespect as you clearly have for your parents, or having
>> such dogged intolerance of the beliefs of others ... :-(
>> Arfa
> Summed up in very few words in fact quite accurately
> a disrespectful know-nothing wannbe

I liked the part about "gogged intolerance of the beliefs of others".
And not even a hint of irony. LOL.

--
Scientists are always changing their story and as a Conservative, I
have no tolerance for ambiguity. It proves that all science is lies
and the only thing we can trust is right wing rhetoric.
-- BONZO@27-32-240-172 [daily nymshifter], 14 Jan 2011 14:46 +1100

==============================================================================
TOPIC: Sherwood RX-5502 Receiver Protection Shutdown, Repair, thoughts wanted..
.
http://groups.google.com/group/sci.electronics.repair/t/ba9b4799ea243157?hl=en
==============================================================================

== 1 of 2 ==
Date: Wed, Oct 12 2011 7:36 pm
From: who where

On Wed, 12 Oct 2011 10:05:18 -0700 (PDT), "William R. Walsh"
<wm_walsh@hotmail.com> wrote:

(snip)

>What I really want to know, though, is whether or not a drop-in
>replacement with more current delivering capability than the LM340 or
>78xx series exists. I've looked halfheartedly over the years but never
>found anything. I could always build a more capable regulator board
>and hack it in there, but I don't really feel like doing that. A fan
>would be easier and faster.

Alternative 3-terminal linear regs will still dissipate the same
amount of heat regardless of their current capability.

If the problem is in the load (i.e. faulty components) then that
should be where you focus your attention.

If the real problem is the load current and the consequent thermal
issues (i.e marginal/poor design vs SOA) then measure the actual load
current and consider a drop-in switcher such as the (TI) PT78T112V or
(RECOM) R-7812.

== 2 of 2 ==
Date: Wed, Oct 12 2011 7:49 pm
From: Jeffrey Angus

On 10/12/2011 12:05 PM, William R. Walsh wrote:
> What I really want to know, though, is whether or not a drop-in
> replacement with more current delivering capability than the LM340 or
> 78xx series exists.

Actually, it sounds more like they blew the design by having too
much input voltage for the output voltage and current.

As a modest example of what I mean:
18V input 12V output at 1 amp. This is 6 watts dissipation at
the regulator package.
24V input 12V output at 1 amp. This is 12 watts dissipation
at the regulator package.

<http://www.datasheetcatalog.org/datasheets2/52/529144_1.pdf>

Doesn't specifically give a voltage drop vs output current
derating curve. But I would think that adding a bit of series
resistance to the input side and letting some of the waste
heat go away there would go a long way towards extending the
life of the regulator package.

Jeff

--
"Everything from Crackers to Coffins"

==============================================================================
TOPIC: Store that sells ceiling fan capacitors?
http://groups.google.com/group/sci.electronics.repair/t/4792acac41b3eaae?hl=en
==============================================================================

== 1 of 1 ==
Date: Wed, Oct 12 2011 8:05 pm
From: "Michael A. Terrell"

gregz wrote:
>
> Rich Webb <bbew.ar@mapson.nozirev.ten> wrote:
> > On Tue, 11 Oct 2011 22:09:12 -0700 (PDT), spamtrap1888
> > <spamtrap1888@gmail.com> wrote:
> >
> >> This is not precisely on-topic, but this group is resourceful, and it
> >> does concern an electronic component.
> >>
> >> The no-name ceiling fan over our kitchen table was making a strange
> >> odor of the "electrical" variety. I feared it was coming from the
> >> insulation of the motor wiring, but googling suggested the capacitor
> >> as the common source of smells. One or more self-healing film caps are
> >> potted into a rectangular package. With failed caps the package
> >> bulges, according to pictures that people posted.
> >>
> >> So, before I took everything apart, I decided to find a store that
> >> stocked such capacitors. Then I would gut the thing and run over with
> >> the bad part, come back with the good one, wire it in, and have the
> >> whole thing buttoned up before my wife got home and started
> >> complaining about the chaos I always introduce to her life. (In
> >> fairness, there are a lot of ziplock bags with parts in them around
> >> here.)
> >>
> >> But the usual suspects don't seem to carry them. Not appliance part
> >> stores or electrical supply stores. I couldn't find them listed at
> >> Home Desperate or Louse. There were only a couple of online ceiling-
> >> fan-part-only outfits, which I try to avoid: I like to show the
> >> counter guy what I need, have him give it to me, pay, go home, and
> >> replace.
> >>
> >> Any ideas? If I must buy online I must, but I would really rather not
> >
> > Try Grainger http://www.grainger.com They do have lots of motor start /
> > run caps at competitive prices and also do have a brick 'n' mortar
> > presence around the US (try the "Find a Branch" link).
>
> Granger does not sell to public. Try drillspot who sells granger parts,
> cheaper.

That depends on the individual location. Some only require a tax
certificate, while others will sell and handle sales tax. I have no
problems buying at Grainger. Home Depot & Lowes used to sell them, but
I haven't looked lately. There's always Ebay. "180 results found for
ceiling fan capacitor" right now.

<http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=ceiling+fan+capacitor&_sacat=See-All-Categories>

--
You can't have a sense of humor, if you have no sense.

==============================================================================
TOPIC: Type of ceramic wirewound resistor?
http://groups.google.com/group/sci.electronics.repair/t/24e3fe2e41d78acc?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Oct 13 2011 12:17 am
From: "N_Cook"

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:Qorlq.2873$QM.495@newsfe28.ams2...
>
>
> "N_Cook" <diverse@tcp.co.uk> wrote in message
> news:j73ffs$ojj$1@dont-email.me...
> > Arfa Daily <arfa.daily@ntlworld.com> wrote in message
> > news:j55lq.21321$N14.13209@newsfe12.ams2...
> >>
> >>
> >> "N_Cook" <diverse@tcp.co.uk> wrote in message
> >> news:j71kel$g1i$1@dont-email.me...
> >> > Arfa Daily <arfa.daily@ntlworld.com> wrote in message
> >> > news:1VXkq.287$F95.92@newsfe11.ams2...
> >> >>
> >> >>
> >> >> "N_Cook" <diverse@tcp.co.uk> wrote in message
> >> >> news:j70r0t$i9p$1@dont-email.me...
> >> >> > Arfa Daily <arfa.daily@ntlworld.com> wrote in message
> >> >> > news:KXLkq.2469$651.887@newsfe04.ams2...
> >> >> >>
> >> >> >>
> >> >> >> "N_Cook" <diverse@tcp.co.uk> wrote in message
> >> >> >> news:j6u7ru$hnh$1@dont-email.me...
> >> >> >> > I have one in front of me labelled
> >> >> >> > UTM 210-9 25435,3 watt probably Russian and can find no info
> >> >> >> > Like the standard pillar white/grey ceramic resistors but
instead
> > of
> >> >> >> > the
> >> >> >> > wire returning down the flute of the ceramic there is a sprung
> > join
> >> > set
> >> >> > in
> >> >> >> > the flute with bismuth solder or something. Anyone know a
generic
> >> > name
> >> >> > for
> >> >> >> > this type of thermal cut out resistor or a maker name ?
> >> >> >> > Other than the opening temperature must be greater than the
> >> >> >> > sustained
> >> >> >> > power
> >> >> >> > rating temp of the resistor and lower than standard solder,
> >> >> >> > anyone
> >> > know
> >> >> >> > what
> >> >> >> > sort of safety cut out temperature?
> >> >> >> >
> >> >> >> >
> >> >> >>
> >> >> >> Back in the day when I was a TV engineer, they were very common,
> >> >> >> and
> >> >> >> known
> >> >> >> as 'spring-off resistors'. Often used to be used in the feed to
the
> >> >> >> HOP
> >> >> >> stage, and would spring open when the HOP valve failed. They were
> >> > usually
> >> >> >> re-soldered with what we knew just as 'high melting point
solder'.
> >> >> >> I've
> >> >> >> no
> >> >> >> idea what actual temperature the stuff was, just that it was
issued
> > to
> >> >> >> us,
> >> >> > a
> >> >> >> few feet at a time, for re-soldering these devices. The Adcola
> >> >> >> irons
> >> > that
> >> >> > we
> >> >> >> used (about 50 watts, as I recall ??) struggled a bit with it,
but
> >> >> >> were
> >> >> >> ultimately capable of making the joint quite nicely.
> >> >> >>
> >> >> >> Arfa
> >> >> >>
> >> >> >
> >> >> > Are you saying it was somehow solder that needed a lot of heat
> >> >> > rather
> >> > than
> >> >> > a
> >> >> > lot of temperature?
> >> >> >
> >> >> >
> >> >>
> >> >> Dunno really. No. I think I mean that it needed a lot of
temperature.
> > The
> >> >> Adcola, with its solid copper bit, certainly produced enough heat
at
> > the
> >> >> tip to handle a small job like resoldering that spring, but it did
> >> >> have
> > a
> >> >> little difficulty taking the solder to a 'full flow' consistency, so
> >> >> probably didn't have quite the temperature required. Remember that
> >> >> this
> >> > was
> >> >> nearly 40 years ago, when a TV engineer's soldering iron was little
> > more
> >> >> than an electric poker ...
> >> >>
> >> >> The solder was just designated "HMP" for high melting point, and as
I
> >> >> recall, was a little greyer looking on the reel than 'standard'
> >> >> solder.
> >> >>
> >> >> Arfa
> >> >>
> >> >
> >> >
> >> > So a more sophisticated version of the aluminium foil and nail for a
> > fuse
> >> > replacement ?
> >> >
> >> >
> >>
> >> No, I would say not. I worked for Rediffusion, and they were one of the
> > best
> >> 'technical' rental companies in the business. Their training and
> >> attention
> >> to detail, was second to none, and they used these resistors in their
own
> > TV
> >> set designs, so if that's what they said was the right way to handle
> >> remaking one of these devices after it had sprung off, then you can be
> >> pretty sure that it was right. There was never any question of the
> > resistor
> >> having to be replaced because it had sprung open ...
> >>
> >> Arfa
> >>
> >
> > I must be missing something here , what is the point of the spring off
> > disconnect?
> >
> >
>
> It opens the resistor, and removes power from the overload condition that
> it's there to protect against ...
>
> Arfa
>

But not if you "weld" it shut with high melting point solder

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