Using mobile phone as an internet radio

Phil Hobbs wrote:

I've never had a package stolen, as far as I can recall.


Me, either. It's probably that their postal system won't come to
reasonable terms with the US postal system.

Jeff Liebermann wrote:

On Thu, 04 Oct 2012 10:03:21 -0400, Phil Hobbs
wrote:

Yep. As I understand it (possible wrong), AC filaments break in the
middle, mostly from vibration flexing.

I don't think so, because there's no mechanism for that, as I said. The
wire is fully annealed at all times, so there's no possibility of
progressive fatigue failure.

Oscillating filament light bulb:
http://www.youtube.com/watch?v=t_DwwNVA-7Q
Whether the earths magnetic field is strong enough to induce such
oscillations is questionable.

While digging for the apparently mythical lifetime test data on
incandescent light bulbs, I've found numerous theories on why
filaments fail. Tungsten evaporation, causing hot spots, is the most
common. One suggested that thermal cycling hardens the tungsten and
makes it brittle. Another suggested that the inrush current causes a
mechanical shock if it hits at the 60Hz peak, instead of at the zero
crossing. Yet another speculates that the temperature differential
between the hot filament, and the relatively cold mounting structure
may cause cracking.

--

All of those except the hot spot mechanism assume that the tungsten
work-hardens in the bulb and then fails from fatigue. However, that
isn't the case, because the annealing temperature of tungsten is about
1300 C, so the tungsten in a light bulb filament is always fully
annealed.

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
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

George Herold wrote:

On Oct 5, 2:51 pm, Jeff Liebermann wrote:
On Thu, 04 Oct 2012 10:03:21 -0400, Phil Hobbs

wrote:
Yep. As I understand it (possible wrong), AC filaments break in the
middle, mostly from vibration flexing.

I don't think so, because there's no mechanism for that, as I said. The
wire is fully annealed at all times, so there's no possibility of
progressive fatigue failure.

Oscillating filament light bulb:
http://www.youtube.com/watch?v=t_DwwNVA-7Q
Whether the earths magnetic field is strong enough to induce such
oscillations is questionable.

While digging for the apparently mythical lifetime test data on
incandescent light bulbs, I've found numerous theories on why
filaments fail.

Grin, the internet as a 'fire hose' of information. I went searching
for something that contained "Philips tech. rev." and found a
reference to the following article,

H. Horster, E. Kauer and W. Lechner — The Burn-out Mechanism of
Incandescent Lamps Philips Technical Review 32,155-164, 1971.

It was referenced in "Illuminating Engineering - Page 32 - Google
Books"

But nothing about turn on failure... sigh.

Here is a patent by some of the same guys at Philips... lots of stuff
about the filament getting hottest in the middle.

http://www.freepatentsonline.com/3868159.html
(Actually a decently written patent.)

George H.

Tungsten evaporation, causing hot spots, is the most
common. One suggested that thermal cycling hardens the tungsten and
makes it brittle. Another suggested that the inrush current causes a
mechanical shock if it hits at the 60Hz peak, instead of at the zero
crossing. Yet another speculates that the temperature differential
between the hot filament, and the relatively cold mounting structure
may cause cracking.


I can believe that the filament is hottest in the middle. It's
furtherst from the support, so whatever conductive heat sinking there is
will be less, but more than that, it sees the radiative input from the
rest of the filament on both sides instead of just one.

Sort of similar to the case of a long solenoid, whose B field at the
ends is half what it is in the middle.

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
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

In article ,
Michael A. Terrell wrote:

Phil Hobbs wrote:

I've never had a package stolen, as far as I can recall.


Me, either. It's probably that their postal system won't come to
reasonable terms with the US postal system.

Other countries seem quite happy to use ordinary post to the UK. The US,
not. So explain that.

--
*Never put off until tomorrow what you can avoid altogether *

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote:

In article ,
Michael A. Terrell wrote:

Phil Hobbs wrote:

I've never had a package stolen, as far as I can recall.

Me, either. It's probably that their postal system won't come to
reasonable terms with the US postal system.

Other countries seem quite happy to use ordinary post to the UK. The US,
not. So explain that.


Probably the War of 1812.

Coming from Canada, I can tell you that the USPS is very nearly flawless
when compared with Canada Post. Those morons can't find their rear ends
with both hands and a map.

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
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

On Fri, 05 Oct 2012 19:00:56 -0400, Phil Hobbs
wrote:

George Herold wrote:

On Oct 5, 2:51 pm, Jeff Liebermann wrote:
On Thu, 04 Oct 2012 10:03:21 -0400, Phil Hobbs

wrote:
Yep. As I understand it (possible wrong), AC filaments break in the
middle, mostly from vibration flexing.

I don't think so, because there's no mechanism for that, as I said. The
wire is fully annealed at all times, so there's no possibility of
progressive fatigue failure.

Oscillating filament light bulb:
http://www.youtube.com/watch?v=t_DwwNVA-7Q
Whether the earths magnetic field is strong enough to induce such
oscillations is questionable.

While digging for the apparently mythical lifetime test data on
incandescent light bulbs, I've found numerous theories on why
filaments fail.

Grin, the internet as a 'fire hose' of information. I went searching
for something that contained "Philips tech. rev." and found a
reference to the following article,

H. Horster, E. Kauer and W. Lechner — The Burn-out Mechanism of
Incandescent Lamps Philips Technical Review 32,155-164, 1971.

It was referenced in "Illuminating Engineering - Page 32 - Google
Books"

But nothing about turn on failure... sigh.

Here is a patent by some of the same guys at Philips... lots of stuff
about the filament getting hottest in the middle.

http://www.freepatentsonline.com/3868159.html
(Actually a decently written patent.)

George H.

Tungsten evaporation, causing hot spots, is the most
common. One suggested that thermal cycling hardens the tungsten and
makes it brittle. Another suggested that the inrush current causes a
mechanical shock if it hits at the 60Hz peak, instead of at the zero
crossing. Yet another speculates that the temperature differential
between the hot filament, and the relatively cold mounting structure
may cause cracking.


I can believe that the filament is hottest in the middle. It's
furtherst from the support, so whatever conductive heat sinking there is
will be less, but more than that, it sees the radiative input from the
rest of the filament on both sides instead of just one.

Aren't the filaments welded to the elements at the ends? It would seem that
this would cause a narrowing. ISTR most filaments broken near the supports,
which would be counter to the hotter-in-the-middle theory.

My theory is that bulbs tend to fail when turned on because of the thermal
shock but only because they were about to fail anyway. Cycling, itself,
doesn't have a huge effect on longevity, certainly not a factor of two.

Sort of similar to the case of a long solenoid, whose B field at the
ends is half what it is in the middle.

Do they only burn out when energized? ;-)

On Sat, 06 Oct 2012 00:11:01 +0100, "Dave Plowman (News)"
wrote:

In article ,
Michael A. Terrell wrote:

Phil Hobbs wrote:

I've never had a package stolen, as far as I can recall.


Me, either. It's probably that their postal system won't come to
reasonable terms with the US postal system.

Nope, not here either.

Other countries seem quite happy to use ordinary post to the UK. The US,
not. So explain that.

Follow the money.

"Dave Plowman (News)" wrote:

In article ,
Michael A. Terrell wrote:

Phil Hobbs wrote:

I've never had a package stolen, as far as I can recall.

Me, either. It's probably that their postal system won't come to
reasonable terms with the US postal system.

Other countries seem quite happy to use ordinary post to the UK. The US,
not. So explain that.


Sigh. Ask 'your' post office why the rates are so damn high. The
rates are agreed on between countries, and the British system is the
only that people constantly complain about. Likely high tarriffs on
imports from the US that are imposed on incoming goods.

In article ,
says...

On 2012-10-02, jim stone wrote:
Not being able to find a small internet radio to buy we liked, we got mobile
phone with which we link with wi-fi to a modem router, and use it as an
internet radio.

Keeping the phoned plugged into its charger all the time, we are using it to
play *all-day* background classical music through an amplifier and speakers.

Since the phone has no 'moving parts' unlike a computer, we are wondering if
this continuous playing all day of the phone is going to shorten its working
life ?

It may be bad for the battery

My favorite apps on my phone:

TuneIn, Pandora, ScannerRadioPro, EchoLink and RepeaterBook.

And that's kind of why I got the extended battery pack for the phone.

On 06/10/2012 00:15, Phil Hobbs wrote:
"Dave Plowman (News)" wrote:

In article ,
Michael A. Terrell wrote:

Phil Hobbs wrote:

I've never had a package stolen, as far as I can recall.

Me, either. It's probably that their postal system won't come to
reasonable terms with the US postal system.

Other countries seem quite happy to use ordinary post to the UK. The US,
not. So explain that.


Probably the War of 1812.

Coming from Canada, I can tell you that the USPS is very nearly flawless
when compared with Canada Post. Those morons can't find their rear ends
with both hands and a map.


The Americans do seem generally to be used to sending a lot by courier
when we would just put in the post. Tending to happen in the UK also
even though the Royal Mail / Parcelforce often give a better service and
of course do not charge extra to send further. There has been a big
campaign in the North of Scotland about companies charging extra for
many postcode areas.