Driver to drive?

[JosephKK]

On Fri, 27 Feb 2009 17:30:22 -0600, krw <krw@att.zzzzzzzzz> wrote:

In article <a95d21c1-a351-49cc-b176-b0217011ca24
@v18g2000pro.googlegroups.com>, jeffm_@email.com says...
Ian Bell wrote:
Most ISPs these days provide newsnet access for free.
Mine has done for the last 10 years.

JeffM wrote:
...then there are those on this side of the pond
who have posturing "public servants"
who have done their best to make that go away
--especially those folks in the Empire State:
http://www.google.com/search?q=Andrew-Cuomo+Usenet&num=100

In matters of digital freedom, many Democrats are NOT your friend.
http://www.google.com/search?q=site:slashdot.org+Feinstein&num=100

krw wrote:
That's an excuse to shut down a loser.

She hasn't gotten any votes from me.
http://google.com/search?q=cache:VkTPXKdEx_kJ:en.wikipedia.org/wiki/United_States_Senate_election_in_California,_2006+c+inc+Green.Party+c+inc+c+Todd.Chretien&strip=1
http://google.com/search?q=cache:5_Ht2gQR4BcJ:www.therealdifference.org/issues.html+*-*-Enron-scandal-*+logging+Green.Party+Failed.to.Act+wiretaps+Weak.Support+marijuana+Minimal.Support+agribusiness+Privatization.of.prisons+*-*-*-Marriage-*&strip=1

...and if I lived in NY, I'd be telling everyone I encountered *there*
about how the *that* posturing idiot
is trying to get it where gov't can control what you can think.

Two *completely* different issues.

Oh really? Both that feinstein and that cuomo are afer all the

control they can get.

So how are the issues all that different?

 

[JosephKK]

On Thu, 26 Feb 2009 18:25:07 -0800 (PST), GreenXenon
<glucegen1x@gmail.com> wrote:

Hi:

What waveform of FSK do[es] the EDT [European Deaf Telephone]
protocol use?

FSK = Frequency Shift Keying

Quote from http://www.deaflibrary.org/v18/v18.html :

"EDT Operational Mode -- The modulation is frequency shift keyed
modulation (i.e. carrier is 10 ms before a character is transmitted
and removed 1s after the last character) using Recommendation V.21(1)
frequencies. The data signalling rate is 110 bits/s."

Quote from
http://www.freshpatents.com/Text-telephone-modem-communications-over-packet-networks-dt20050908ptan20050195801.php?type=description:

"European Deaf Telephone (or EDT), which is used in Germany, Austria,
Switzerland, Malta, Spain and Italy, uses ITU-T V.21 Channel 1
modulation at a signaling rate of 110 bps. ITU-T V.21 Channel 1
modulation has a mark frequency at 980 Hz and a space frequency at
1080 Hz. In EDT, the mark frequency is transmitted for 300 ms before a
character is transmitted, and the mark frequency is transmitted for up
to one (1) second after the last character. EDT has a character format
of one (1) start bit, seven (7) data bits, one (1) even parity bit and
two (2) stop bits. The first EDT character can be detected using the
present invention, as described below. For example, at step 506 of
FIG. 5, the mark frequency that precedes the start bit is used for the
detection of the first EDT character. At step 508, tone detector 420
starts looking for the mark frequency, i.e. 980 Hz, and at step 510,
it is determined whether the 980 Hz mark frequency is detected for a
pre-determined amount of time. In one embodiment, detection of 10-20
ms of the mark frequency can be sufficient at step 510."

According to the above links, EDT uses FSK in which the two are
frequencies are 980 Hz [representing a "1"] and 1080 Hz [representing
a "0"].

What are the shapes of the 980 Hz and 1080 Hz tones? Are they sine
waves, square waves, sawtooth waves, triangle waves??

Would an EDT-demodulator recognize only certain wave-shapes while
ignoring others?


Thanks

It is designed around sine waves. An excess of harmonics may cause
bit recognition errors. If you stay properly v.21 compliant (sine
waves) you should be OK.

 

[krw]

On Sun, 01 Mar 2009 09:58:53 -0800,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Fri, 27 Feb 2009 17:30:22 -0600, krw <krw@att.zzzzzzzzz> wrote:

In article <a95d21c1-a351-49cc-b176-b0217011ca24
@v18g2000pro.googlegroups.com>, jeffm_@email.com says...
Ian Bell wrote:
Most ISPs these days provide newsnet access for free.
Mine has done for the last 10 years.

JeffM wrote:
...then there are those on this side of the pond
who have posturing "public servants"
who have done their best to make that go away
--especially those folks in the Empire State:
http://www.google.com/search?q=Andrew-Cuomo+Usenet&num=100

In matters of digital freedom, many Democrats are NOT your friend.
http://www.google.com/search?q=site:slashdot.org+Feinstein&num=100

krw wrote:
That's an excuse to shut down a loser.

She hasn't gotten any votes from me.
http://google.com/search?q=cache:VkTPXKdEx_kJ:en.wikipedia.org/wiki/United_States_Senate_election_in_California,_2006+c+inc+Green.Party+c+inc+c+Todd.Chretien&strip=1
http://google.com/search?q=cache:5_Ht2gQR4BcJ:www.therealdifference.org/issues.html+*-*-Enron-scandal-*+logging+Green.Party+Failed.to.Act+wiretaps+Weak.Support+marijuana+Minimal.Support+agribusiness+Privatization.of.prisons+*-*-*-Marriage-*&strip=1

...and if I lived in NY, I'd be telling everyone I encountered *there*
about how the *that* posturing idiot
is trying to get it where gov't can control what you can think.

Two *completely* different issues.

Oh really? Both that feinstein and that cuomo are afer all the
control they can get.

So how are the issues all that different?

ISPs shutting down NNTP servers is about costs. Cuomo was a timely

excuse.

 

[krw]

On Sun, 01 Mar 2009 09:39:50 -0800, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 1 Mar 2009 16:01:53 +0100, "Bill Sloman"
bill.sloman@ieee.org> wrote:

http://sciencemag.org/cgi/content/abstract/323/5918/1187

Martin van Calmhout - a formidable Dutch science journalist - reviewed
this article in Science in yesterday's Volkskrant. One of the authors -
Henk Brinkhuis - is a professor at Utrecht.

It talks about a 5C drop in global temperature over 100,000 years some
34 million years ago during the Eocene-Oligocene Climate Transition.

The paper is based a new technique for recovering paleolthic
temperatures, by measuring the the relative concentrations of
particular organic chemicals in the cell wall of single cell fossils,
which allowed the authors to clarify what what actually going
on during the transition, when the Antartic ice-sheet seems to
have made its appearance

The authors can't come up with an explanation for why it happened
as fast as it did. Explanations for the transition do exist, but they
seem to envisage a slower cooling.

http://www.nature.com/nature/journal/v452/n7190/full/nature06853.html

No doubt the denialists will blame the sun, as usual.


Five inches of snow in Alabama, in March!

http://news.yahoo.com/s/ap/20090301/ap_on_re_us/winter_storm

Yep. It's snowing here, about 100mi SW of Atlanta, now. My wife is
"pissed" at me (said it didn't snow here, before we moved). She
didn't much like the "watch for ice on bridges" signs on the way down,
either. ;-) Though she grew up in Houston, she had enough snow (and
leftist weenies) for a lifetime when we lived in VT.

 

[John Larkin]

On Sun, 01 Mar 2009 12:14:47 -0600, krw <krw@att.bizzzzzzzzzzz> wrote:

On Sun, 01 Mar 2009 09:39:50 -0800, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 1 Mar 2009 16:01:53 +0100, "Bill Sloman"
bill.sloman@ieee.org> wrote:

http://sciencemag.org/cgi/content/abstract/323/5918/1187

Martin van Calmhout - a formidable Dutch science journalist - reviewed
this article in Science in yesterday's Volkskrant. One of the authors -
Henk Brinkhuis - is a professor at Utrecht.

It talks about a 5C drop in global temperature over 100,000 years some
34 million years ago during the Eocene-Oligocene Climate Transition.

The paper is based a new technique for recovering paleolthic
temperatures, by measuring the the relative concentrations of
particular organic chemicals in the cell wall of single cell fossils,
which allowed the authors to clarify what what actually going
on during the transition, when the Antartic ice-sheet seems to
have made its appearance

The authors can't come up with an explanation for why it happened
as fast as it did. Explanations for the transition do exist, but they
seem to envisage a slower cooling.

http://www.nature.com/nature/journal/v452/n7190/full/nature06853.html

No doubt the denialists will blame the sun, as usual.


Five inches of snow in Alabama, in March!

http://news.yahoo.com/s/ap/20090301/ap_on_re_us/winter_storm

Yep. It's snowing here, about 100mi SW of Atlanta, now. My wife is
"pissed" at me (said it didn't snow here, before we moved). She
didn't much like the "watch for ice on bridges" signs on the way down,
either. ;-) Though she grew up in Houston, she had enough snow (and
leftist weenies) for a lifetime when we lived in VT.

Sounds like a great woman.

John

 

[krw]

On Sun, 01 Mar 2009 10:45:37 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On Sun, 01 Mar 2009 09:39:50 -0800, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 1 Mar 2009 16:01:53 +0100, "Bill Sloman"
bill.sloman@ieee.org> wrote:

http://sciencemag.org/cgi/content/abstract/323/5918/1187

Martin van Calmhout - a formidable Dutch science journalist - reviewed
this article in Science in yesterday's Volkskrant. One of the authors -
Henk Brinkhuis - is a professor at Utrecht.

It talks about a 5C drop in global temperature over 100,000 years some
34 million years ago during the Eocene-Oligocene Climate Transition.

The paper is based a new technique for recovering paleolthic
temperatures, by measuring the the relative concentrations of
particular organic chemicals in the cell wall of single cell fossils,
which allowed the authors to clarify what what actually going
on during the transition, when the Antartic ice-sheet seems to
have made its appearance

The authors can't come up with an explanation for why it happened
as fast as it did. Explanations for the transition do exist, but they
seem to envisage a slower cooling.

http://www.nature.com/nature/journal/v452/n7190/full/nature06853.html

No doubt the denialists will blame the sun, as usual.


Five inches of snow in Alabama, in March!

http://news.yahoo.com/s/ap/20090301/ap_on_re_us/winter_storm

And Hansen's global warming civil disobedience protest in DC will
probably be snowed-in.

http://www.foxnews.com/story/0,2933,501064,00.html


It's cold and rainy here, ideal to refill the reservoirs and put some
more base on the ski slopes.

http://www.squaw.com/

A 7-foot base is OK, but the more the better.

John


Slowman is so senile he thinks his opinions supersede all others.

Leftist weenies do believe the world revolves around them.

 

[JosephKK]

On Sun, 01 Mar 2009 09:52:31 +0000, Martin Brown
<|||newspam|||@nezumi.demon.co.uk> wrote:

Robert Baer wrote:
Richard Henry wrote:
On Feb 27, 9:15 pm, Robert Baer <robertb...@localnet.com> wrote:

Martin Brown wrote:

Robert Baer wrote:

** Copied from an investment newsletter **

Chalk one up for dissent. Japanese scientists were smart enough to
find the fraud in the anthropogenic global warming hypothesis and then
had the balls to publicly disagree with the UN's Intergovernmental
Panel on Climate Change about it.

The Japan Society of Energy and Resources issued a report that says
global warming is related to solar activity, and the rise in global
temperatures was primarily a recovery from the so-called Little Ice
Age, which lasted from 1400 to 1800. Kanya Kusano, program director
for the Earth simulator at the Japan Agency for Marine-Earth Science &
Technology, says computer climate modeling used to support the manmade
global warming theory is like "ancient astrology."

If you think fraudulent climate science doesn't affect you
financially, you may wish to know that, according to The Politico,
there are now four climate change lobbyists for every member of
Congress.

And we all know that the ethical standards of bankers and investment
advisers are beyond reproach so it must be true...

Japanese science can be pretty flaky. They still have people
researching
Fleschmann and Pons style "cold fusion" and watching catfish to try and
predict earthquakes. Some of it is good but by no means all.

The society for "Energy and Resources" sounds very much like a fossil
fuel lobby group. AGW really only began to bite in the past 4 decades.
The bounce back from the Little Ice Age was over by then.

Regards,
Martin Brown

FYI, cold fusion has been verified and proven to be an alternate
approach to energy generation.
A lot cheaper and smaller than a Tokomak in the back yard...
**

????

Really? That is news. Tell us more.

...use google...

And you will get the usual bunch of absolute raving lunatic sites
claiming infinite free energy just send $10k to fund our "research".
Some of it is really funny in a warped sort of way.

If you believe cold fusion is just around the corner based on a few daft
websites no wonder you are suckered by all the sophisticated PR based
AGW denialist propaganda.

Regards,
Martin Brown

Or you suckered by the AGW PR, which is still diminishing despite
Obama living at 1600 Pensylvania Avenue.

I have the UCAR models/data and others as well. Not much compiles
yet.

 

[Don Klipstein]

In <amhlq4l1qjl8l9lli17coqvffe3386a06l@4ax.com>, John Larkin said in part:

Five inches of snow in Alabama, in March!

http://news.yahoo.com/s/ap/20090301/ap_on_re_us/winter_storm

This is only a little unusual, actually - a once per decade or two event
for Birmingham.
Birmingham receoved 10 inches of snow on March 12-13 1993.

And Hansen's global warming civil disobedience protest in DC will
probably be snowed-in.

http://www.foxnews.com/story/0,2933,501064,00.html

I just checked Accu-Weather's website, predicting 3-6 inches of snow in
Washington DC. Washington DC appears to me to get a March snowstorm like
that every few years.

They received 13 inches on March 13, 1993, 12 inches on March 29-30
1942, 12 inches on March 27-28 1891, and 5 inches on April 1 1924.

The latest snowfall in Washington DC is:

"Trace on May 10, 1906; .5 inches on Apr. 28, 1898"

according to: http://www.erh.noaa.gov/lwx/winter/DC-Winters.htm

- Don Klipstein (don@misty.com)

 

[Bart!]

On Sun, 01 Mar 2009 09:53:36 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On Sun, 01 Mar 2009 08:38:20 -0800,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Thu, 26 Feb 2009 16:45:26 -0800, Bart!
B@rt_The_Sheriff_Is_A_Nig**!.org> wrote:

On Thu, 26 Feb 2009 16:49:11 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:



The offending poster was posting from a yahoo address, moving to
googlegroups. I would normally never see the post, except for the
reposts by the troll feeders ;-)

...Jim Thompson

No, idiot, he was not posting from yahoo. IF you had read the post,
instead of your standard blanket assumption CRAP, you might have caught
that, except you are too busy being a header prude, and a very bad one at
that. What a WUSSY you are!

You as well should bother checking the headers.


Already in place...

Author: ... | {bart\!}

...Jim Thompson

He wasn't talking to you about me, you fucking total retard.

 

[Bart!]

On Sun, 01 Mar 2009 08:38:20 -0800, "JosephKK"<quiettechblue@yahoo.com>
wrote:

On Thu, 26 Feb 2009 16:45:26 -0800, Bart!
B@rt_The_Sheriff_Is_A_Nig**!.org> wrote:

On Thu, 26 Feb 2009 16:49:11 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:



The offending poster was posting from a yahoo address, moving to
googlegroups. I would normally never see the post, except for the
reposts by the troll feeders ;-)

...Jim Thompson

No, idiot, he was not posting from yahoo. IF you had read the post,
instead of your standard blanket assumption CRAP, you might have caught
that, except you are too busy being a header prude, and a very bad one at
that. What a WUSSY you are!

You as well should bother checking the headers.

Dumbfuck, his email address given is NOT the source, it is the reply
info. THE SOURCE was supernews, you fucking retard! I DID read the
headers. I suggest you learn how to read them and what to read before
you spew, jackass.

 

[Archimedes' Lever]

On Fri, 27 Feb 2009 12:37:01 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

Of course I actually paid money for my reader ;-)

...Jim Thompson
Bwuahahahahaa!

 

[Archimedes' Lever]

On Sun, 1 Mar 2009 14:32:41 -0800 (PST), Richard Henry
<pomerado@hotmail.com> wrote:

On Feb 27, 5:19 pm, UltimatePatriot
UltimatePatr...@thebestcountry.org> wrote:
On Fri, 27 Feb 2009 14:14:38 -0600, krw <k...@att.zzzzzzzzz> wrote:
In article <go9hfm$k3...@localhost.localdomain>,
ruffreco...@yahoo.com says...
Bit Farmer wrote:
I just canceled my SuperNews subscription.  Seems there are not many
free readers around.  Times are tough and it makes little sense to pay
for access to what is written here.   I rarely post anyway.  That leaves
Google for reading.  So be it.

Most ISPs these days provide newsnet access for free. Mine has done for
the last 10 years.

Several are shutting them down.

  Not any that have any brains.

  We need a boycott America web site so that businesses that gouge and
take on other unsavory attributes can be labeled as such and avoided.
Hopefully to the point at which they go out of business.

  A good one to start with is the damned "Head On" family of retarded,
snake oil products.

  We should also fight for redress on Capitol Hill.  The CRAP that idiot
bastard president is pulling is worse than the crap he and Ayers pulled
several years back.

  I cannot believe that Americans are going to stand for the slap in the
face he is giving everyone.  The retarded bastard actually thinks that we
are all too stupid to see what he pulled off for exactly what it is.

  Call for REDRESS!  I want him OUT.  Not impeached... OUT.  FULL
REDRESS!  This slip it in under the guise of crisis management CRAP ain't
gonna cut it.  Americans across the nation need to put their foot down,
and have it be heard!  DAMNIT!

 It is our right given by the constitution.  This ain't mutiny folks.  I
was NEVER on the bastard's crew to begin with, so I cannot be considered
mutinous for wanting him OUT.  I want him out because he has no clue as
to how the country operates, nor how to manage its operation.

From too much time channel-surfing late at night:

You're an idiot. I don't 'channel surf'.

Avoid anything sold
by Kevin Trudeau or advertised by Billy Mays.

No shit.

The "Girls Gone Wild" videos, however, are exactly what they are
advertised to be.

Actually, they don't even come close.

 

[Joerg]

D from BC wrote:

On Sat, 28 Feb 2009 17:05:30 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

qrk wrote:
On Fri, 27 Feb 2009 18:22:52 -0800, D from BC
myrealaddress@comic.com> wrote:

On Fri, 27 Feb 2009 16:11:49 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

qrk wrote:
On Thu, 26 Feb 2009 19:40:45 -0800, D from BC
myrealaddress@comic.com> wrote:

I've seen a few schematics of opto's being used in linear mode for
smps designs..
But what about those digital isolators? Are they just for digital
circuits?

Right now I'm working on applying a digital isolator for a smps
design..
http://focus.ti.com/lit/ds/symlink/iso721.pdf
Note that the datasheet doesn't mention smps applications. hmmm

Anybody know some design examples of smps's using digital isolators
(opto digital, galvanic, GMR or RF)?


D from BC
myrealaddress(at)comic(dot)com
BC, Canada
Posted to usenet sci.electronics.design
I use both in switching power supplies. The analog opto for voltage
feedback, the digital isolator (Analog Devices ADuM1200 series) for
setting power supply voltage.

Three bucks for an isolator in a switcher? Yikes.
Relative to sluggish optos, the galvanic ISO721 is not cheap.
Probably the only reason I'm using it is to dodge modelling a fast
opto in ltspice.
Another reason I'm dodging a linear opto is that my smps design is
experimental and a poorly applied opto may cause loop stability
problems. If anything goes wrong, I can't blame an opto if it's not
there.

It's a tradeoff.. So the parts are expensive, but I get the design
done earlier.
A linear opto in the feedback loop is plenty fast enough. I'm using a
PS2801-1, about $0.40 in quantity, in a 50W, 600 kHz switcher. It's
almost trival to use an opto. Programmable shunt regulators like the
LMV431 are about $0.20.

If you use a TL431 you can shave off another $0.15

LMV431 ref voltage is 1.24V
LM431 ref voltage is 2.5V

Sure, but do you need less than 2.5V Vout?

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[Richard Henry]

On Feb 27, 4:16 pm, Bob Engelhardt <bobengelha...@comcast.net> wrote:

Bit Farmer wrote:

...

Why is posting from Google Groups so bad?  ...

Google Groups is used by spammers without any interference by Google.
Since so much spam comes from Google Groups, many usenet readers simply
block all G-G posts.

Bob

Rather than just not reading the spam?

 

[Richard Henry]

On Feb 27, 5:19 pm, UltimatePatriot
<UltimatePatr...@thebestcountry.org> wrote:

On Fri, 27 Feb 2009 14:14:38 -0600, krw <k...@att.zzzzzzzzz> wrote:
In article <go9hfm$k3...@localhost.localdomain>,
ruffreco...@yahoo.com says...
Bit Farmer wrote:
I just canceled my SuperNews subscription.  Seems there are not many
free readers around.  Times are tough and it makes little sense to pay
for access to what is written here.   I rarely post anyway.  That leaves
Google for reading.  So be it.

Most ISPs these days provide newsnet access for free. Mine has done for
the last 10 years.

Several are shutting them down.

  Not any that have any brains.

  We need a boycott America web site so that businesses that gouge and
take on other unsavory attributes can be labeled as such and avoided.
Hopefully to the point at which they go out of business.

  A good one to start with is the damned "Head On" family of retarded,
snake oil products.

  We should also fight for redress on Capitol Hill.  The CRAP that idiot
bastard president is pulling is worse than the crap he and Ayers pulled
several years back.

  I cannot believe that Americans are going to stand for the slap in the
face he is giving everyone.  The retarded bastard actually thinks that we
are all too stupid to see what he pulled off for exactly what it is.

  Call for REDRESS!  I want him OUT.  Not impeached... OUT.  FULL
REDRESS!  This slip it in under the guise of crisis management CRAP ain't
gonna cut it.  Americans across the nation need to put their foot down,
and have it be heard!  DAMNIT!

 It is our right given by the constitution.  This ain't mutiny folks.  I
was NEVER on the bastard's crew to begin with, so I cannot be considered
mutinous for wanting him OUT.  I want him out because he has no clue as
to how the country operates, nor how to manage its operation.

From too much time channel-surfing late at night: Avoid anything sold
by Kevin Trudeau or advertised by Billy Mays.

The "Girls Gone Wild" videos, however, are exactly what they are
advertised to be.

 

[Martin Riddle]

"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
message news:amhlq4l1qjl8l9lli17coqvffe3386a06l@4ax.com...

On Sun, 1 Mar 2009 16:01:53 +0100, "Bill Sloman"
bill.sloman@ieee.org> wrote:

http://sciencemag.org/cgi/content/abstract/323/5918/1187

Martin van Calmhout - a formidable Dutch science journalist - reviewed
this article in Science in yesterday's Volkskrant. One of the
authors -
Henk Brinkhuis - is a professor at Utrecht.

It talks about a 5C drop in global temperature over 100,000 years some
34 million years ago during the Eocene-Oligocene Climate Transition.

The paper is based a new technique for recovering paleolthic
temperatures, by measuring the the relative concentrations of
particular organic chemicals in the cell wall of single cell fossils,
which allowed the authors to clarify what what actually going
on during the transition, when the Antartic ice-sheet seems to
have made its appearance

The authors can't come up with an explanation for why it happened
as fast as it did. Explanations for the transition do exist, but they
seem to envisage a slower cooling.

http://www.nature.com/nature/journal/v452/n7190/full/nature06853.html

No doubt the denialists will blame the sun, as usual.


Five inches of snow in Alabama, in March!

http://news.yahoo.com/s/ap/20090301/ap_on_re_us/winter_storm

And Hansen's global warming civil disobedience protest in DC will
probably be snowed-in.

http://www.foxnews.com/story/0,2933,501064,00.html


It's cold and rainy here, ideal to refill the reservoirs and put some
more base on the ski slopes.

http://www.squaw.com/

A 7-foot base is OK, but the more the better.

John

Thanks to GW were looking at upto 14" of the white stuff.
<http://www.accuweather.com/watches-warnings.asp?partner=1010wins&zipcode=10101&zone=NYZ072&county=NYC061>

Cheers

 

[D from BC]

On Sun, 1 Mar 2009 16:01:53 +0100, "Bill Sloman"
<bill.sloman@ieee.org> wrote:

http://sciencemag.org/cgi/content/abstract/323/5918/1187

Martin van Calmhout - a formidable Dutch science journalist - reviewed
this article in Science in yesterday's Volkskrant. One of the authors -
Henk Brinkhuis - is a professor at Utrecht.

It talks about a 5C drop in global temperature over 100,000 years some
34 million years ago during the Eocene-Oligocene Climate Transition.

The paper is based a new technique for recovering paleolthic
temperatures, by measuring the the relative concentrations of
particular organic chemicals in the cell wall of single cell fossils,
which allowed the authors to clarify what what actually going
on during the transition, when the Antartic ice-sheet seems to
have made its appearance

The authors can't come up with an explanation for why it happened
as fast as it did. Explanations for the transition do exist, but they
seem to envisage a slower cooling.

http://www.nature.com/nature/journal/v452/n7190/full/nature06853.html

No doubt the denialists will blame the sun, as usual.

When's the next ice age due?


D from BC
myrealaddress(at)comic(dot)com
BC, Canada
Posted to usenet sci.electronics.design

 

[D from BC]

On Sun, 01 Mar 2009 15:06:53 -0800, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

D from BC wrote:
On Sat, 28 Feb 2009 17:05:30 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

qrk wrote:
On Fri, 27 Feb 2009 18:22:52 -0800, D from BC
myrealaddress@comic.com> wrote:

On Fri, 27 Feb 2009 16:11:49 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

qrk wrote:
On Thu, 26 Feb 2009 19:40:45 -0800, D from BC
myrealaddress@comic.com> wrote:

I've seen a few schematics of opto's being used in linear mode for
smps designs..
But what about those digital isolators? Are they just for digital
circuits?

Right now I'm working on applying a digital isolator for a smps
design..
http://focus.ti.com/lit/ds/symlink/iso721.pdf
Note that the datasheet doesn't mention smps applications. hmmm

Anybody know some design examples of smps's using digital isolators
(opto digital, galvanic, GMR or RF)?


D from BC
myrealaddress(at)comic(dot)com
BC, Canada
Posted to usenet sci.electronics.design
I use both in switching power supplies. The analog opto for voltage
feedback, the digital isolator (Analog Devices ADuM1200 series) for
setting power supply voltage.

Three bucks for an isolator in a switcher? Yikes.
Relative to sluggish optos, the galvanic ISO721 is not cheap.
Probably the only reason I'm using it is to dodge modelling a fast
opto in ltspice.
Another reason I'm dodging a linear opto is that my smps design is
experimental and a poorly applied opto may cause loop stability
problems. If anything goes wrong, I can't blame an opto if it's not
there.

It's a tradeoff.. So the parts are expensive, but I get the design
done earlier.
A linear opto in the feedback loop is plenty fast enough. I'm using a
PS2801-1, about $0.40 in quantity, in a 50W, 600 kHz switcher. It's
almost trival to use an opto. Programmable shunt regulators like the
LMV431 are about $0.20.

If you use a TL431 you can shave off another $0.15

LMV431 ref voltage is 1.24V
LM431 ref voltage is 2.5V


Sure, but do you need less than 2.5V Vout?

Yup.. 2V is required in my design..
It's not pretty but I got a LMV431 stuck on the output of an op amp to
create a 2V offset.
(Long story how that got decided.)


D from BC
myrealaddress(at)comic(dot)com
BC, Canada
Posted to usenet sci.electronics.design

 

[Joerg]

D from BC wrote:

On Sun, 01 Mar 2009 15:06:53 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

D from BC wrote:
On Sat, 28 Feb 2009 17:05:30 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

qrk wrote:
On Fri, 27 Feb 2009 18:22:52 -0800, D from BC
myrealaddress@comic.com> wrote:

On Fri, 27 Feb 2009 16:11:49 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

qrk wrote:
On Thu, 26 Feb 2009 19:40:45 -0800, D from BC
myrealaddress@comic.com> wrote:

I've seen a few schematics of opto's being used in linear mode for
smps designs..
But what about those digital isolators? Are they just for digital
circuits?

Right now I'm working on applying a digital isolator for a smps
design..
http://focus.ti.com/lit/ds/symlink/iso721.pdf
Note that the datasheet doesn't mention smps applications. hmmm

Anybody know some design examples of smps's using digital isolators
(opto digital, galvanic, GMR or RF)?


D from BC
myrealaddress(at)comic(dot)com
BC, Canada
Posted to usenet sci.electronics.design
I use both in switching power supplies. The analog opto for voltage
feedback, the digital isolator (Analog Devices ADuM1200 series) for
setting power supply voltage.

Three bucks for an isolator in a switcher? Yikes.
Relative to sluggish optos, the galvanic ISO721 is not cheap.
Probably the only reason I'm using it is to dodge modelling a fast
opto in ltspice.
Another reason I'm dodging a linear opto is that my smps design is
experimental and a poorly applied opto may cause loop stability
problems. If anything goes wrong, I can't blame an opto if it's not
there.

It's a tradeoff.. So the parts are expensive, but I get the design
done earlier.
A linear opto in the feedback loop is plenty fast enough. I'm using a
PS2801-1, about $0.40 in quantity, in a 50W, 600 kHz switcher. It's
almost trival to use an opto. Programmable shunt regulators like the
LMV431 are about $0.20.

If you use a TL431 you can shave off another $0.15
LMV431 ref voltage is 1.24V
LM431 ref voltage is 2.5V

Sure, but do you need less than 2.5V Vout?

Yup.. 2V is required in my design..

Ok, didn't know that. That'll be 15 cents extra

It's not pretty but I got a LMV431 stuck on the output of an op amp to
create a 2V offset.
(Long story how that got decided.)

Yeah, those legacy solutions. "Hey, that goes back to ol'Leroy, not
purdy but it's always worked, why's it wrong now?"

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[Richard Henry]

On Mar 1, 9:39 am, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 1 Mar 2009 16:01:53 +0100, "Bill Sloman"





bill.slo...@ieee.org> wrote:
http://sciencemag.org/cgi/content/abstract/323/5918/1187

Martin van Calmhout - a formidable Dutch science journalist - reviewed
this article in Science in yesterday's Volkskrant. One of the authors -
Henk Brinkhuis - is a professor at Utrecht.

It talks about a 5C drop in global temperature over 100,000 years some
34 million years ago during the Eocene-Oligocene Climate Transition.

The paper is based a new technique for recovering paleolthic
temperatures, by measuring the the relative concentrations of
particular organic chemicals in the cell wall of single cell fossils,
which allowed the authors to clarify what what actually going
on during the transition, when the Antartic ice-sheet seems to
have made its appearance

The authors can't come up with an explanation for why it happened
as fast as it did. Explanations for the transition do exist, but they
seem to envisage a slower cooling.

http://www.nature.com/nature/journal/v452/n7190/full/nature06853.html

No doubt the denialists will blame the sun, as usual.

Five inches of snow in Alabama, in March!

http://news.yahoo.com/s/ap/20090301/ap_on_re_us/winter_storm

And Hansen's global warming civil disobedience protest in DC will
probably be snowed-in.

http://www.foxnews.com/story/0,2933,501064,00.html

It's cold and rainy here, ideal to refill the reservoirs and put some
more base on the ski slopes.

http://www.squaw.com/

A 7-foot base is OK, but the more the better.

John- Hide quoted text -

- Show quoted text -

Sierra snowfall is well below average this winter.

http://cdec.water.ca.gov/cgi-progs/reports/EXECSUM