magnetic field

[Sporkman]

Has anyone suggested to you the use of a "Faraday cage"? I'm really not
an electronics type, but IIRC just a grounded metal grid separated from
your monitor by a distance twice that of the aperture size of the grid
should isolate your appliance from RFI. Of course that would also mean
surrounding your monitor with something like "hardware cloth" (square
apertures) or "chicken wire" (not a good idea), INCLUDING THE FRONT.
Probably impractical, but it would be interesting to see whether doing
such would make any difference.

'Sporky'

Sodah wrote:

Just to add an interesting footnote... Late evening/night (e.g. the present
moment) the 'flicker' diminishes _dramatically_. My guess is that this is
due to it being "off peak" hours for electricity demand (i.e. less energy
going through --and therefore, being emitted by-- the powerlines).

 

[Michael Moroney]

"Charles Perry" <pipesandtobacco@hotmail.com> writes:

By the way, don't assume that those big power lines you see outside are the
cause. They often aren't. This type of interference is caused by magnetic
fields, which are caused by current. The strength of the field decreases by
the square of the distance. Those big lines often have no more current than
the low voltage ones attached to your home and they are much farther away.
It is very likely that the conductors causing the problem are low voltage
(600v or less). It could be the service conductor to the house (or
apartement building). It could also be a transformer. It could be wiring
in the wall.

Yes, probably high-current wiring and/or a transformer. I remember one
job for a test group where we had a bank of systems/monitors along a wall,
on the other side of which was the electrical room for the entire floor of
a rather large building, with a large (guessing) 480V-120/208 volt
transformer. (just outside it and a floor below was a BIG transformer on
a pad which fed it) Anyway, all those monitors' images danced all day
long. As they were all test/burn in systems nobody ever had to use them
for long so it didn't really matter.


--
-Mike

 

[Sodah]

"Charles Perry" <pipesandtobacco@hotmail.com> wrote in message
news:c245vc$1p9ob0$1@ID-103962.news.uni-berlin.de...

"Sodah" <sodah6@home.com> wrote in message
news:iag1c.673376$X%5.202631@pd7tw2no...
..[...]
Well, I'll just add that the builder of the house had to ground all of
the
window frames (which are aluminum, of course) when this house was
constructed. The other day when the cable guy came to install my
internet
connection, he was mystified and daunted when he saw all the cabling
seemingly "coming out of everywhere". I had to explain to him that it
was
not television (or other coaxial) cable...

Sodah

Why did he have to ground them? Who told him he had to ground them? What
was grounding them going to fix?

Charles Perry P.E.

For buildings in such close proximity to high-tension power lines (e.g. in
the city of Surrey, British Columbia, Canada) as this house is, the above is
required by the local building code. The grounding is ostensibly to prevent
arcing and/or other electrical discharge (a potential fire hazard???) along
the metal window frames, owing to their close proximity to said power lines.
I'm sorry I can't give you a more rigorous or comprehensive answer, as I
haven't seen the building code specification for myself. This information
was provided by word of the real estate agent prior to purchase. However, I
suggest if you are genuinely motivated to learn something new or interesting
here (whether it be about _true science_, or merely municipal _politics_, I
don't know) that you research this for yourself. I didn't post here in
order to debate anything with anybody.


Sodah

"Try to second guess all you like, but what I've described here are my
discrete observations; scrupulously kept independent of and uncorrupted by
the interpretation I've expressed thereof."

 

[Charles Perry]

"Sodah" <sodah6@home.com> wrote in message
news:NNB1c.686984$ts4.559200@pd7tw3no...
<snip>

For buildings in such close proximity to high-tension power lines (e.g. in
the city of Surrey, British Columbia, Canada) as this house is, the above
is
required by the local building code. The grounding is ostensibly to
prevent
arcing and/or other electrical discharge (a potential fire hazard???)
along
the metal window frames, owing to their close proximity to said power
lines.
I'm sorry I can't give you a more rigorous or comprehensive answer, as I
haven't seen the building code specification for myself. This information
was provided by word of the real estate agent prior to purchase. However,
I
suggest if you are genuinely motivated to learn something new or
interesting
here (whether it be about _true science_, or merely municipal _politics_,
I
don't know) that you research this for yourself. I didn't post here in
order to debate anything with anybody.


Sodah
What I was getting at was that the grounding helps an electrostatic problem,

that is related to high voltage lines but has nothing to do with the problem
of the monitor flickering. The flickering is caused by magnetic, not
electric, fields. A high electric field does NOT indicate a high magnetic
field. People (particularly the news media) equate a high voltage line with
high magnetic fields and it is just plain incorrect. The magnetic field
from your service conductor is almost always higher than that from a high
voltage line outside of your home.

Charles Perry P.E.

 

[Bob Myers]

"Sporkman" <sporkedUNDERLINEagainMUNGE@bigfootDOT.com> wrote in message
news:404686FC.4072815C@bigfootDOT.com...

Has anyone suggested to you the use of a "Faraday cage"? I'm really not
an electronics type, but IIRC just a grounded metal grid separated from
your monitor by a distance twice that of the aperture size of the grid
should isolate your appliance from RFI.

The problem is, this ISN'T RFI. It's magnetic interference, and
a Faraday cage won't do diddly for that.

Bob M.

 

[Dbowey]

Bill posted:
<< Let's not forget that each Slinky will be slightly longer or shorter than
another, slightly lighter or heavier as well. >>

Would that be measured in ounces-Troy, or cubic inches of banana cream pie?

Don

 

[Kevin McMurtrie]

In article <8qok405fh0ajskjp4plm9hla1nkt1s0jdq@4ax.com>,
Ben Bradley <ben_nospam_bradley@mindspring.example.com> wrote:

In alt.binaries.schematics.electronic,
sci.electronics.cad,
sci.electronics.design,
sci.electronics.misc,
Jim Thompson <thegreatone@example.com> wrote:

If you place a Slinky on an escalator, will it go forever ?

This is misuse of a Slinky. A Slinky should be stretched out with a
transducer at each end and used as a "spring reverb."

It can also be made to shimmy using several amps of pulsed current.

 

[WEBPA]

"Butterworth" is a type of polynomial resulting in a transfer function which
is implemented by a Low Pass, High Pass, Band Pass or Band Reject passive
or active circuit. The roots of this polynomial fall on a unit circle.

"Jon B" <u035m4i02@sneakemail.com> wrote in message
news:298d9774.0403290714.abbef44@posting.google.com...
Does anyone happen to know the first name of the inventor of the
Butterworth filter? Or anything else about him? Or whether
Butterworth actually invented it? I can't find anything online...

You are missing the key ingrediant: It is his wife, known only as Mrs.
Butterworth, who is the more famous family member. She was an employee of a
large, multi-national food conglomerant in the 1930s. While working as a
nutritionist, she invented a way to manufacture pancake syrup from cow
mesenteries, and offered her likeness as a sales gimmick for the commercial
produce. It is still offered for sale in the USA. Obviously, her
contributions to the general health and welfare far outweighed those of her
husband, and she is, therefore, much more widely known.

Or...maybe not.

webpa

 

[WEBPA]

decided to be fair with the leftists and listen to Al Franken's new
talk show (I've found him funny on Leno, etc.).

Looks like he loses his humor capability when immersed into a talk
show environment.

Looks like "Liberal Talk Radio" will die a quick death.

...Jim Thompson

Don't jump to conclusions. The dirty old men who gathered to create "Liberal
Talk Radio" were under the wildly false impressions that "Conservative Talk
Radio" had been created under the same circumstances.

It wasn't.

It was created over a period of years by trial and error. That is: Try a format
and a content and see if anyone listens. Maybe nobody but me remembers the
"errors" from 1986-1996: Jim Hightower, Tom Leykis (pre-sleaze political
phase), and many, many, many more at the local level.

All the present set of personalities and formats on the air (except for
"Liberal Talk Radio") got there by having large, spendthrift audiences. The
"errors" demonstrated loud, nasty, cheap, etc., audiences in small numbers over
long time periods. Fact.

IAW: If Ho Chi Min's funding came from TV ad sales in Hanoi, he'd have happily
run John Wayne movies 24/7. Same with all the current media moguls. Except for
the dirty old men who founded "Liberal Talk Radio." Until they run out of
their own money (or get it funded via PBS)....or the listening audience changes
its preferences.

We'll see.
webpa

 

[Jim Thompson]

On 03 Apr 2004 23:54:11 GMT, webpa@aol.com (WEBPA) wrote:

[snip]

It was created over a period of years by trial and error. That is: Try a format
and a content and see if anyone listens. Maybe nobody but me remembers the
"errors" from 1986-1996: Jim Hightower, Tom Leykis (pre-sleaze political
phase), and many, many, many more at the local level.

[snip]
We'll see.
webpa

I remember Leykis, he did a tour here in Phoenix at KFYI. Sometimes
funny, but mostly a trash mouth. Last contact I had with him was
while surfing radio stations while driving thru L.A. on my way to the
Bakersfield Business Conference a few years ago.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[CWatters]

"WEBPA" <webpa@aol.com> wrote in message
news:20040403183222.03625.00000596@mb-m01.aol.com...

You are missing the key ingrediant: It is his wife, known only as Mrs.
Butterworth, who is the more famous family member. She was an employee of
a
large, multi-national food conglomerant in the 1930s. While working as a
nutritionist, she invented a way to manufacture pancake syrup from cow
mesenteries, and offered her likeness as a sales gimmick for the
commercial
produce. It is still offered for sale in the USA. Obviously, her
contributions to the general health and welfare far outweighed those of
her
husband, and she is, therefore, much more widely known.

Or...maybe not.

Google says not....

John McNaught

DAYTON -- John Patrick McNaught died Saturday, April 20, 2001, in
Chattanooga.

Born in Dannemora, N.Y., as the sixth of seven children, he grew up in
Waukesha, Wis. He graduated from Tufts University in Medford, Mass., with a
degree in chemistry and served in World War II as a chemical warfare
instructor.
He spent his career working for Lever Brothers Co., first in Cambridge,
Mass., and then in Edgewater, N.J., where he ultimately became the research
director. He was awarded numerous patents in fats and oils processing. ****
His best-known invention was Mrs. Butterworth's syrup ****

He moved to Dayton in 1985. He was a member of St. Bridget's Catholic
Church, where he was a eucharistic minister and also served on the finance
committee. He was a member and served as president of the Dayton Golf and
Country Club. He served as a volunteer with the Literacy Volunteers of
America. He was an active member of the Dayton Rotary Club. He was an avid
bridge player and belonged to several bridge clubs.

He was preceded in death by parents, Waldo F. and Edith McNaught; brother,
Waldo E. McNaught; and sisters, Martha, Marion Hettenhouse and Alice Kieley.

He is survived by wife, the former Jane Tulloch, whom he married in 1945;
daughter, Maggie McMahon of Signal Mountain; son, John McNaught of Richmond,
Va.; daughter, Patricia of Basking Ridge, N.J.; five grandchildren; and two
sisters, Margaret Jones of Eastport, Maine, and Joan McNaught of Bedford,
Mass.

Funeral services will be 11 a.m. Tuesday at St. Bridget's Catholic Church
with Father Gilbert Diaz officiating
Visitation is 3-5 p.m. and 7-9 p.m. today
Interment in Spivey Cemetery.
Services by Coulter Garrison Funeral Home Inc., Dayton.

 

[WEBPA]

Or...maybe not.

Google says not....

John McNaught

DAYTON -- John Patrick McNaught died Saturday, April 20, 2001, in
Chattanooga.

Born in Dannemora, N.Y., as the sixth of seven children, he grew up in
Waukesha, Wis. He graduated from Tufts University in Medford, Mass., with a
degree in chemistry and served in World War II as a chemical warfare
instructor.
He spent his career working for Lever Brothers Co., first in Cambridge,
Mass., and then in Edgewater, N.J., where he ultimately became the research
director. He was awarded numerous patents in fats and oils processing. ****
His best-known invention was Mrs. Butterworth's syrup ****

He moved to Dayton in 1985. He was a member of St. Bridget's Catholic
Church, where he was a eucharistic minister and also served on the finance
committee. He was a member and served as president of the Dayton Golf and
Country Club. He served as a volunteer with the Literacy Volunteers of
America. He was an active member of the Dayton Rotary Club. He was an avid
bridge player and belonged to several bridge clubs.

He was preceded in death by parents, Waldo F. and Edith McNaught; brother,
Waldo E. McNaught; and sisters, Martha, Marion Hettenhouse and Alice Kieley.

He is survived by wife, the former Jane Tulloch, whom he married in 1945;
daughter, Maggie McMahon of Signal Mountain; son, John McNaught of Richmond,
Va.; daughter, Patricia of Basking Ridge, N.J.; five grandchildren; and two
sisters, Margaret Jones of Eastport, Maine, and Joan McNaught of Bedford,
Mass.

Funeral services will be 11 a.m. Tuesday at St. Bridget's Catholic Church
with Father Gilbert Diaz officiating
Visitation is 3-5 p.m. and 7-9 p.m. today
Interment in Spivey Cemetery.
Services by Coulter Garrison Funeral Home Inc., Dayton.

Oh.

Never mind, then.

webpa

 

[John Fields]

On Thu, 08 Apr 2004 08:06:23 GMT, "Rich Grise" <null@example.net>
wrote:

"John Fields" <jfields@austininstruments.com> wrote in message
news:3vh870hclbdvkif9asebbd20m911v8onv8@4ax.com...
On Tue, 06 Apr 2004 21:29:29 GMT, "Rich Grise" <null@example.net
Here's a crazy idea for a one-second pulse, once an hour:
...
The details, of course, are left as an exercise for
the reader. ?;-

---
Good thing too, since it seems a few details have escaped you.

Oh, they didn't escape - i was never trying to hold them
prisoner. ;-)

---
How could you? You never even caught them!^)
---


--
John Fields

 

[Mjolinor]

"John Fields" <jfields@austininstruments.com> wrote in message
news:77pa70lka0cfu6bpjjv52qpduv8gcko3or@4ax.com...

On Thu, 08 Apr 2004 08:06:23 GMT, "Rich Grise" <null@example.net
wrote:

"John Fields" <jfields@austininstruments.com> wrote in message
news:3vh870hclbdvkif9asebbd20m911v8onv8@4ax.com...
On Tue, 06 Apr 2004 21:29:29 GMT, "Rich Grise" <null@example.net
Here's a crazy idea for a one-second pulse, once an hour:
...
The details, of course, are left as an exercise for
the reader. ?;-

---
Good thing too, since it seems a few details have escaped you.

Oh, they didn't escape - i was never trying to hold them
prisoner. ;-)

---
How could you? You never even caught them!^)
---

Real slimy creatures are details, you think you have them all and then
realise they were fooling you and some of them sacrifice themself in order
that some may escape. Definate hierachy in their behaviour where the most
damaging ones are protected by the non fatal / non explosive/ non
embarrasing type. They come in all shapes and sizes and as a species are
most difficult to recognise.

 

[Dbowey]

John Larkin posted:

<< On Sun, 25 Apr 2004 06:38:24 GMT, judgejudy <judgejudy@shaw.com>
wrote:

What a bunch of Blow-Farts!

I think this group has gotten off topic. What the hell does this have
to do with electronics?

Who the hell is "judgejudy"?
I don't know!

Who the hell is John Gault?

Don

 

[Bennet Williams]

I agree. A switching regulator would be best in this case. A digital
camera is a relatively large load for a battery, and you want to get
all the efficiency you can. Diodes or linear regulators will waste
alot of energy as heat.

BRW

On Sat, 01 May 2004 11:18:57 +0200, Rene Tschaggelar <none@none.net>
wrote:

IdeaMan wrote:

I want to step down a 7.2v lithium ion (Li-ion) camcorder battery to 4.7v to power my digital camera for long periods of
time, can someone send me schematic via email or post one that fits my needs. Thank you for help with this. I forgot the
email address: please send to blowphish@juno.com of hypnotech@juno.com .

You come here to read the answer...

There are tons of switchers available from various manufacturers.
texasinstruments, lineartech, ...

Rene

 

[Anthony Fremont]

<philippeficarelli@wanadoo.fr> wrote in message
newshilippeficarelli@wanadoo.fr...
I have a document attached,
which should solve your problems.

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_TORVIL.C

I don't think this is going to solve anyone's problems.

 

[MikeM]

Tyson Howard wrote:

I just installed a remote starter into my 1990 Chevy Suburban. It worked
for a while, then it would not start remotely anymore. I found that the 30-
amp fuse in the remote starter was blown. I am assuming that my truck
requires more than 30 amps to start the vehicle. I decided to use an
external relay to do it, but the largest auto relays I can find are 30-amp.
Is it possible to wire 2 of these in parallel (obviously with a fuse
inline) to avoid damage to the relays? If not, what is a good source of
higher than 30 amp relays that I can use to do this?

Are you routing the starter motor cable through the relay?

If so, why?

The key switch contacts in the steering column can do the job
while passing less than an Amp or two.

MikeM

 

[ATS]

You, should never have to pass that much amperage to start the vehicle with
the remote start. As MikeM said, go to the steering column for your
connections.


NH




"MikeM" <trashcan@yahoo.com> wrote in message
news:c7e76r$869$1@coward.ks.cc.utah.edu...

Tyson Howard wrote:

I just installed a remote starter into my 1990 Chevy Suburban. It worked
for a while, then it would not start remotely anymore. I found that the
30-
amp fuse in the remote starter was blown. I am assuming that my truck
requires more than 30 amps to start the vehicle. I decided to use an
external relay to do it, but the largest auto relays I can find are
30-amp.
Is it possible to wire 2 of these in parallel (obviously with a fuse
inline) to avoid damage to the relays? If not, what is a good source of
higher than 30 amp relays that I can use to do this?

Are you routing the starter motor cable through the relay?

If so, why?

The key switch contacts in the steering column can do the job
while passing less than an Amp or two.

MikeM

 

[Tyson Howard]

I went through the ignition harness coming out of the steering wheel.

"ATS" <me@nospam.org> wrote in news:109l89teg4loa96@corp.supernews.com:

You, should never have to pass that much amperage to start the
vehicle with
the remote start. As MikeM said, go to the steering column for your
connections.


NH




"MikeM" <trashcan@yahoo.com> wrote in message
news:c7e76r$869$1@coward.ks.cc.utah.edu...
Tyson Howard wrote:

I just installed a remote starter into my 1990 Chevy Suburban. It
worked for a while, then it would not start remotely anymore. I
found that the
30-
amp fuse in the remote starter was blown. I am assuming that my
truck requires more than 30 amps to start the vehicle. I decided to
use an external relay to do it, but the largest auto relays I can
find are
30-amp.
Is it possible to wire 2 of these in parallel (obviously with a
fuse inline) to avoid damage to the relays? If not, what is a good
source of higher than 30 amp relays that I can use to do this?

Are you routing the starter motor cable through the relay?

If so, why?

The key switch contacts in the steering column can do the job
while passing less than an Amp or two.

MikeM