Driver to drive?

[Rich Grise]

On Thursday 07 October 2004 07:08 pm, Brian Raab did deign to grace us with
the following:

Tested it on myself, unfortunately something went wrong and it reduced
my IQ from 150 to 15.

What can I do now?

Become a rap "performer"

Get a government grant

Join the Army!
Join the Navy!
Join the Marines!

Take mass quantities of drugs.

Memorize all the arithmetic there is, and become an idiot savant.

Or, just do whatever you feel like.

Have Fun!
Rich

 

[Ken Smith]

In article <e715b5cc.0410072229.6d43ac92@posting.google.com>,
R.Legg <legg@magma.ca> wrote:

kensmith@green.rahul.net (Ken Smith) wrote in message
news:<ck1mhp$aus$4@blue.rahul.net>...

Fusetec looked a little hopeful.
I've also got info coming from Stetron

Try Siemens Epcos.

http://www.epcos.com/web/produkt_katalog/html/ptc_thermistors_e.html

Thanks I'm printing the datasheet while typing this. I quick look makes
me think it solves the problem completely. Now I have to look for
gotchas.

--
--
kensmith@rahul.net forging knowledge

 

[Ken Smith]

In article <o10dm01v5mge45rigrukohfetcvj4gutsu@4ax.com>,
legg <legg@nospam.magma.ca> wrote:
[...]

I'm not sure how fast you could expect a PTC to operate - they are
thermally activated, after all. I expect that a shunt TVS or Sidac is
needed to shunt overload energy while any series protection goes into
effect.

I have an impedance in the way to limit the current. On the "protected"
side of the devices there are diodes to the power rails and TVSes on the
power rails. The TVSes have to eat about 150 Watts for as long as it
takes the PTC to act. I will scale the TVSes as needed.

--
--
kensmith@rahul.net forging knowledge

 

[Jamie]

Brian Raab wrote:

Tested it on myself, unfortunately something went wrong and it reduced
my IQ from 150 to 15.

What can I do now?

Well you didn't do so bad, at least you still have some left which is
more than i can say for a few i work with!

 

[Jamie]

Paul Burke wrote:

Robert Morein wrote:

"Brian Raab" <kaisers_sun@yahoo.com> wrote in message
news:8d001dc6.0410071808.6e3f9c4f@posting.google.com...

Tested it on myself, unfortunately something went wrong and it reduced
my IQ from 150 to 15.

What can I do now?



Don't worry, be happy



Perceive the happy moron: he doesn't give a damn.
I wish I were a moron. Good God! Perhaps I am!

Paul Burke
No comment!

 

[John Larkin]

On Fri, 8 Oct 2004 16:15:27 +0100, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Spehro Pefhany <speffSNIP@interlog
DOTyou.knowwhat> wrote (in <6nbdm09f2e9338ci0o7btl10561qctd4ti@4ax.com&gt
about 'Something to ponder', on Fri, 8 Oct 2004:

I'd rather you posted something on generating precise nanosecond-range
delays. ;-)

Lengths of coax?

There are several suppliers for variable delay lines that use physical
conductors as the delay medium.

http://www.gigabaudics.com/PDDL10/pddl10.html

and a few others. My favorites are the big boxes full of trombones and
leadscrews and stepper motors...

http://www.colbyinstruments.com/pdl-30a.htm


Building a continuously-variable "analog" delay line is an interesting
problem.

Hmmm, what's the mathematics of a trombone line? Say you launch a wide
pulse into it, almost filling it up, and during the pulse you scrunch
it down (rather quickly, obviously). The pulse that comes out is
shorter. How is energy conserved? This is a nastier version of the
charged variable capacitor problem.

As if I didn't have enough to think about already.

John

 

[John Fields]

On Fri, 08 Oct 2004 16:03:37 GMT, Rich Grise <null@example.net> wrote:

Didja hear about the moron that drove his new car off the cliff to
test his new air brakes?

---
So what are you driving now?^)

--
John Fields

 

[Dirk Bruere at Neopax]

Rich Grise wrote:

On Friday 08 October 2004 01:26 am, Scott Stephens did deign to grace us
with the following:


The best thing to do is, if they assholes are worth tolerating, is to
find someone weaker and torment the shit out of them. Give as good as
you get.

...

But in the end, its best not to associate with assholes.


Good Idea.

Plonk.

http://www.wunderland.com/WTS/Ginohn/cetera/hankisms.html

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[John Larkin]

On Fri, 08 Oct 2004 13:09:53 -0400, Mike Monett <no@spam.com> wrote:

Spehro Pefhany wrote:
[...]

Well, Daimler-Chrysler and Hewlett-Packard have a whack of mine, but
it doesn't really take that much lead length to affect the accuracy of
a Pt100 sensor. DIN-curve units change 385 mOhms per K. AWG16 wire has
a resistance of 4.2 ohms per 1000 feet at 25°C, so it only takes about
50' of relatively thick wire (or 8' of AWG24) to cause a
temperature-sensitive offset of 1°C. The sensor elements are stable to
far better than that, of course.

There are also less standard sensors as low as 25 ohms. I don't get to
pick the nominal resistance, it's an industry standard. Field tweaking
of the calibration is unthinkable in most situations. We just want the
instrument and sensor to work together, interchangeably, with no fuss.

The more picky scientific applications use a Kelvin setup, but for
industrial applications, a first-order correction is good enough.

Best regards,
Spehro Pefhany

Golly - 50' of microvolt level signals in an industrial environment? You
must have some horrendous noise problems.

RTDs deliver huge signals... millivolts per K, depending on the
excitation current. Thermocouples are more interesting... close to
three orders of magnitude lower.

John

 

[Don Taylor]

Scott Stephens <scottxs@comcast.net> writes:

IIRC the Navy did some studies, as have the Soviets, and found the earth
has micro-gauss pulsations in the magnetic field which have biological
affects. Has to do with the biological clock.

One of the papers that I can't find now described how someone realized
that the Canadian government had placed magnetometers all across Canada
and all that data on tiny fluctuations of the earth's magnetic field
was just sitting there. So the took the hospital records for conditions
that were thought to depend on fragile biological rhythms and some that
seemed very unlikely to depend on rhythms. The chose sudden infant
death syndrome, a cardiac condition dealing with rhythms and as controls
stroke and something else. Then they looked for correlation between
the magnetic variation and the hospital records. And they found that
the sudden infant death syndrome correlated with the magnetic events.
I think they had statistical significance.

I don't have the paper but I did find the reference:

Geophysical Variables and Behavior: CIII. Days With Sudden Infant Deaths
and Cardiac Arrhythmias in Adults Share a Factor With PC1 Geomagnetic
Pulsations: Implications for Pursuing a Mechanism. Perceputal and
Motor Skills, 2001, 92, pp653-654.

366 patients, correlation > 0.3 only for the arrhythmia cases. Comparing
the day before the magnetic event the correlation was 0.05.

The Persinger stuff is pretty far out, although some other studies have
demonstrated people are sensitive to sub-gauss fields. If you can't find
them (the credible rather than crank links on my web site) I suppose I
could try digging some up.

Some of them are pretty odd. But if you have more credible stuff
I'd certainly be interested.

thanks

 

[John Larkin]

On Fri, 08 Oct 2004 14:18:14 -0400, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

On Fri, 08 Oct 2004 10:43:14 -0700, the renowned John Larkin
jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:

On Fri, 08 Oct 2004 13:09:53 -0400, Mike Monett <no@spam.com> wrote:

Spehro Pefhany wrote:
[...]

Well, Daimler-Chrysler and Hewlett-Packard have a whack of mine, but
it doesn't really take that much lead length to affect the accuracy of
a Pt100 sensor. DIN-curve units change 385 mOhms per K. AWG16 wire has
a resistance of 4.2 ohms per 1000 feet at 25°C, so it only takes about
50' of relatively thick wire (or 8' of AWG24) to cause a
temperature-sensitive offset of 1°C. The sensor elements are stable to
far better than that, of course.

There are also less standard sensors as low as 25 ohms. I don't get to
pick the nominal resistance, it's an industry standard. Field tweaking
of the calibration is unthinkable in most situations. We just want the
instrument and sensor to work together, interchangeably, with no fuss.

The more picky scientific applications use a Kelvin setup, but for
industrial applications, a first-order correction is good enough.

Best regards,
Spehro Pefhany

Golly - 50' of microvolt level signals in an industrial environment? You
must have some horrendous noise problems.


RTDs deliver huge signals... millivolts per K, depending on the
excitation current. Thermocouples are more interesting... close to
three orders of magnitude lower.

John

cough

Cough? Had your flu shots?

John

 

[Joerg]

Hi Marco,

Ok, here is another trick: Generate a frequency range of, say
800-1000MHz which should be easy to do with a PLL or whatever you
prefer. Now mix with a fixed frequency of 800MHz. That results in
0-200MHz and 1600-1800MHz. The latter you can easily filter away with a
simple lowpass. The mixer can be had for a few Dollars at:

http://www.minicircuits.com/

Or go with Winfield's idea and buy a used generator. The larger ones are
cheap and you can get incredible precision with some of the big HP
boxes. Nicely HPIB controlled from a PC.

Regards, Joerg

http://www.analogconsultants.com

 

[Spehro Pefhany]

On 6 Oct 2004 11:56:13 -0700, the renowned pete4242@hotmail.com (Pete)
wrote:

I am completely newbie to microcontrollers, and that's probably why I
don't understand when Microchip's documentation for their sample
application TB055 says "C1 and C2 values selected according to crystal
load capacitance". The sample is at
http://ww1.microchip.com/downloads/en/AppNotes/91055C.pdf and the
picture is right at the beginning of the sample.

I have 20MHz PIC16C745, should I still use 6 MHz chrystal? What should
be C1 and C2 values? Or/and, how do I calculate the values of C1 and
C2?

Thanks!

To calculate C2 and C1:
Use the rated load capacitance of the crystal times two, minus 5pF,
round to the closest standard value. That will get you more than close
enough for most purposes. Eg. for a 12pF-load crystal, you'd use 18pF.

If you have problems with the oscillator starting under some
conditions with a given processor you may need to use a different
crystal.

Some crystals (usually tuning fork type or SMT crystals) have very
limited power capability and you may need to add a series resistor,
depending on the crystal and the power supply voltage to avoid
damaging the crystal, either immediately or by premature aging.
HC-49/U crystals can usually handle 1mW, whereas many SMT crystals are
rated at 100uW maximum.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[SioL]

"Dave VanHorn" <dvanhorn@cedar.net> wrote in message
news:m86dnW9XvdgLEfjcRVn-iA@comcast.com...

I keep reading the AVRs have a cleaner internal design.

Indeed, they do.

No holes or pages in the ram.
Vectored ints
No pages in I/O
Three 16 bit pointer registers.
16 "W" register equivalents
16 more registers that aren't quite as nice.

All those registers and still its possible to run out of them
I'm not too good of a programmer, though.

I'm tempted to go the PIC way just for one particular project because
they seem to be available at higher speeds.

SioL

 

[Winfield Hill]

Rich Grise wrote...

I wonder if anyone finds it noteworthy that if you took some of Mr.
Bloggs's writing, and some of Mr. Dyson's writing, and swapped the
names/parties, you wouldn't be able to tell the difference? ;-)

When Fred gets in rant mode, there's a modest simularity. But
I appreciate Fred's voluminous research links, although I don't
accept the blind label applied to them by some. In contrast,
Dyson rarely posts links to any reference material backing his
claims, which are more often than not unsupportable derogatory
assertions, rather than supportable factual expositions.


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)

 

[Nicholas O. Lindan]

"Don Taylor" <dont@agora.rdrop.com> wrote

tiny fluctuations of the earth's magnetic field
was just sitting there. So the took the hospital records for conditions
that were thought to depend on fragile biological rhythms and some that
seemed very unlikely to depend on rhythms. The chose sudden infant
death syndrome, a cardiac condition dealing with rhythms and as controls
stroke and something else. Then they looked for correlation between
the magnetic variation and the hospital records. And they found that
the sudden infant death syndrome correlated with the magnetic events.
I think they had statistical significance.

Correlation does not prove causality. In a case like this statistical
significance does not exist.

First you need to find the causal mechanism and demonstrate repeatable
and reliable control over it, then measure the size of the effect
in nature.

Correlations are fun to play with, and sometimes to lead to the finding
of a causal mechanism, but they are best left as parlor games. Viz:
Sunspot cycles correlate with the length of women's dresses.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

 

[John Woodgate]

I read in sci.electronics.design that Nicholas O. Lindan <see@sig.com>
wrote (in <QUC9d.12506$gs1.6277@newsread2.news.atl.earthlink.net&gt about
'safe electronic brain stimulator', on Fri, 8 Oct 2004:

Correlations are fun to play with, and sometimes to lead to the finding
of a causal mechanism, but they are best left as parlor games. Viz:
Sunspot cycles correlate with the length of women's dresses.

Yes. Fewer people with syphilis are killed in road accidents than people
without. Makes you think.

But not very long.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[John Larkin]

On Fri, 08 Oct 2004 15:24:53 -0400, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

On Fri, 08 Oct 2004 11:31:34 -0700, the renowned John Larkin
jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:

On Fri, 08 Oct 2004 14:18:14 -0400, Spehro Pefhany
speffSNIP@interlogDOTyou.knowwhat> wrote:

On Fri, 08 Oct 2004 10:43:14 -0700, the renowned John Larkin
jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:

On Fri, 08 Oct 2004 13:09:53 -0400, Mike Monett <no@spam.com> wrote:

Spehro Pefhany wrote:
[...]

Well, Daimler-Chrysler and Hewlett-Packard have a whack of mine, but
it doesn't really take that much lead length to affect the accuracy of
a Pt100 sensor. DIN-curve units change 385 mOhms per K. AWG16 wire has
a resistance of 4.2 ohms per 1000 feet at 25°C, so it only takes about
50' of relatively thick wire (or 8' of AWG24) to cause a
temperature-sensitive offset of 1°C. The sensor elements are stable to
far better than that, of course.

There are also less standard sensors as low as 25 ohms. I don't get to
pick the nominal resistance, it's an industry standard. Field tweaking
of the calibration is unthinkable in most situations. We just want the
instrument and sensor to work together, interchangeably, with no fuss.

The more picky scientific applications use a Kelvin setup, but for
industrial applications, a first-order correction is good enough.

Best regards,
Spehro Pefhany

Golly - 50' of microvolt level signals in an industrial environment? You
must have some horrendous noise problems.


RTDs deliver huge signals... millivolts per K, depending on the
excitation current. Thermocouples are more interesting... close to
three orders of magnitude lower.

John

cough


Cough? Had your flu shots?
John

No rush here, the vaccine doesn't come from Chiron- it comes from ID
Biomedical in Vancouver and from Aventis Pasteur in Lyon. I didn't
bother popping into the local clinic for a free shot last year. Got a
nasty cough that isn't going away very fast though- almost two months
now- something resembling epiglottitis in symptoms-scary. A course of
mid-range antibiotics didn't have any effect except adding to my CC
balance. 8-(

BTW, isn't it typically (1mA Pt100, base metal T/C) more like one
order of magnitude difference (385uV/K vs. ~40uV/K)?

Well, if you run the RTD at 10 mA (fine, if you're scanning) and the
t/c was a type B or something, it would be about three orders.
Besides, 10:1 is "close to three orders of magnitude", isn't it?

Tried cipro yet? That sure works on me.

John

 

[Spehro Pefhany]

On Fri, 08 Oct 2004 16:58:56 -0400, the renowned Mike Monett
<no@spam.com> wrote:

Sorry to hear your antibiotics are not working. Antibiotic resistance is
a growing problem, and it could be serious. Some of the common staph
bacteria can turn deadly and cause pneumonia or even necrotizing
fasciitis. Doctors don't know why, and they can't stop the infection.

It's viral, that's why they didn't work.

I know everyone laughs at my use of colloidal silver, but I'm pretty sure
it would knock down your infection in a matter of hours, with zero side
effects.

If you'd be willing to give it a try, I'd be happy to bring some to you
as a gift and show you how to use it. Once you see what it can do, you
would never go back to antibiotics.

Doctors believe the next SARS virus is only a matter of time. Cipro has
serious side effects and does nothing for viral infections. The steroids
used to combat SARS left people with weak bones that crumbled
spontaneously and wouldn't heal. But colloidal silver stopped the SARS
virus and limited the symptoms to a minor fever.

Do you have any mainstream medical cites on this stuff? It seems to be
officially discouraged or banned world-wide. I know steroids are not
very good for you long-term, but they do work wonders in many cases of
inflammation.

Something to ponder. If you like, you can contact me through my web page.

Mike Monett

References:

[1] "CIPRO Information and Side Effects":

http://www.prostatitis.org/ciproeffects.html

[2] "Megadoses of Steroids Devastated Many Chinese SARS Patients"

http://www.sarswatch.org/comments.php?id=359_0_1_0_C

[3] "50% SARS Survivors Show Early Signs Of Brain Damage"

http://www.rense.com/general37/braind.htm

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Dbowey]

hybridyne posted:

<< I need to create an AM modulated carrier of 25 Khz that is highly
focused in beam width. I need a range of 50 feet. Receiver will be a
tuned resonant tank with about 90 db of gain post detection. I would
like to be able to "focus" this beam but I have no idea of how one
might control the dispersion or radiation pattern of a carrier like
this.

Thank You in advance for your input

At that frequency, the best you can do is use a loop antenna on the
transmitter. It won't be "highly focused," but it will be directional.

Don