Driver to drive?

[RobertMacy]

On Sun, 28 Sep 2014 10:29:14 -0700, <meow2222@care2.com> wrote:

On Sunday, September 28, 2014 3:46:22 PM UTC+1, Robert Macy wrote:
...snip....
HOWEVER, there is still a decided skin effect in a water soaked
something
being heated in a microwave. The outside edges get most of the heat
energy, but the 'captured' interior appears to heat more.

It does heat more. Not the centre, but an inch or so inside the surface.
Lets take the example of defrosting a slice of frozen desert. The outer
edges are surrounded by warm air, the interior is surrounded by cold
ice. Yet an inch in it heats as much as the surface. 2" in, less so.

Bad example, ice is 'transparent to uWave. of course the energy will go in
a long way.

to 'see' skin
depth in a microwave, scramble an egg, place in a shallow dish, and
watch
as the ring of cooked egg progresses from the outside to the inside.

That simply does not demonstrate skin depth. The rf in a nuke oven is
deliberately bounced all round the place to get more even cooking, so
your egg is getting hit from every which way. If you put a light bulb in
a nuke and power it up, you'll see how the rf energy distribution has
not a whole lot to do with the kind of side firing single source you'd
need for your skin depth demo.


NT

Again, was showing how the outside 'shields' the inside, [cooking first]
that is like skin effect.

Like a visual allegory of what is happening.

 

[Jan Panteltje]

On a sunny day (Sat, 27 Sep 2014 12:47:02 -0400) it happened "Maynard A.
Philbrook Jr." <jamie_ka1lpa@charter.net> wrote in
<MPG.2e90b405814846c6989a6b@news.eternal-september.org>:

In article <5425FB8D.6000507@electrooptical.net>,
hobbs@electrooptical.net says...

On 9/26/2014 6:03 PM, DecadentLinuxUserNumeroUno wrote:
On Thu, 25 Sep 2014 04:59:58 +0300, Henry Crun <mike@rechtman.com> Gave
us:

FYI:
worth updating relevant Ub. versions. See:
http://www.ubuntu.com/usn/usn-2362-1/

to check whether you are vulnerable, enter:
env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

(A new version of BASH came in this mornings update)


Yup. For both CentOS 6.5 and Cygwin. Not that I run any web servers
myself, of course....

Cheers

Phil Hobbs

I find it ironic that people would call it a bug since it's been
around for so long.

Just another back door exposed and another one will be created to fill
its place.

Jamie

I dont use bash, but zsh shell,
and that is positive too:
# env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
vulnerable
this is a test

So I remaned /bin/bash /bin/somethingelse
# env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
env: bash: No such file or directory

logical...

and tried the test again with zsh:
# env x='() { :;}; echo vulnerable' zsh -c "echo this is a test"
this is a test


Seems zsh is clean.
To bad a zillion scripts need bash, or have bash specified

so....
But they already know everything.
eeeeh, almost...
?

oops
need to check those logs again.

 

Jeff Liebermann <jeffl@cruzio.com> wrote:

The deadline for getting the drivers onto the distribution floppies
was about 3 months before the original planned release date, so MS
already had all the drivers that they needed. No need to honor their
part of the bargain. MS decided to sell Windoze 2.0 retail, and left
their formerly loyal hardware accessory manufacturers with nothing.

I recall you telling this story before. That doesn't mean you shouldn't
keep telling it, though.

> Lesson learned: Microsoft cannot be trusted.

I don't know all the details but I heard something similar recently.
Microsoft decided that they needed Windows to work on tablets, so they
dreamed up Windows RT (I think), and had some kind of a program for
hardware companies to build prototypes. The companies obliged, did
some designs and maybe even some prototypes, which Microsoft saw. A
short time later, Microsoft announced they were going to build Surface
themselves, which caused many of the hardware partners to simply give
up. Again, some of the fine details of this may be wrong.

Matt Roberds

 

[Jasen Betts]

On 2014-10-02, smbaker@gmail.com <smbaker@gmail.com> wrote:

Would a 1/4 x 1/16 neodymium disc magnet placed adjacent to a pack of 1/4 watt through-hole resistors in storage harm them in any way? I don't think so, but I figure it's a question worth asking.

I'm brainstorming a new way to organize my unweildy collection of taped resistors, and have found the perfect storage mechanism, but I need a little something to keep them in place.

it might magnetise parts of them them, this shouldn't be a problem for
most applications.


--
umop apisdn


--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

 

[Phil Hobbs]

On 10/02/2014 01:24 AM, rickman wrote:

On 10/2/2014 1:04 AM, smbaker@gmail.com wrote:
Would a 1/4 x 1/16 neodymium disc magnet placed adjacent to a pack of
1/4 watt through-hole resistors in storage harm them in any way? I
don't think so, but I figure it's a question worth asking.

I'm brainstorming a new way to organize my unweildy collection of
taped resistors, and have found the perfect storage mechanism, but I
need a little something to keep them in place.

I can't imagine a magnet would harm a resistor. What would make you
think it might? Maybe if the magnet were large enough and you dropped
it on the resistor pack it could cause damage.

If the leads were Kovar, they might get magnetized, but otherwise not.

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

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

 

[RobertMacy]

On Wed, 01 Oct 2014 22:31:08 -0700, <smbaker@gmail.com> wrote:

What would make you think it might?

I can't see any reason it would. They don't seem strong enough to cause
structural damage. The only possible side effect I can see is the
resistor itself or its leads becoming magnetized over time, and being
unsuitable for installation in near components that are sensitive to
magnetic fields.

I just figured it worth brainstorming before I do it to my entire
collection of resistors and someone tells me "gee that was stupid,
didn't you know X would happen and ruin all your resistors?"

if you're worried, simply 'degauss' them before you use them, else the
magnetized lead could do some unknown electrolizing on your PCB causing
deterioration?

Radio Shack used to sell a handheld VCR Tape Demagnetizer for around $15.

 

[amdx]

On 10/2/2014 9:26 AM, RobertMacy wrote:

On Wed, 01 Oct 2014 22:31:08 -0700, <smbaker@gmail.com> wrote:

What would make you think it might?

I can't see any reason it would. They don't seem strong enough to
cause structural damage. The only possible side effect I can see is
the resistor itself or its leads becoming magnetized over time, and
being unsuitable for installation in near components that are
sensitive to magnetic fields.

I just figured it worth brainstorming before I do it to my entire
collection of resistors and someone tells me "gee that was stupid,
didn't you know X would happen and ruin all your resistors?"



if you're worried, simply 'degauss' them before you use them, else the
magnetized lead could do some unknown electrolizing on your PCB causing
deterioration?

Radio Shack used to sell a handheld VCR Tape Demagnetizer for around $15.

VCR Tape? Wasn't that something from the last century?

Just kidding, still have at last three in use. My wife is hoarding
recorders and video tapes. She keeps checking the Goodwill and Salvation
army, she records her soaps and is prepared for the future.
In coming months, our cable company will change to (?) a completely
digital mode and we will need a box to decode, (at each tv ?).
I don't know what she will do then, she's frugal, I don't know if she
will find it economically worthwhile to get the DVR.
Mikek

 

[whit3rd]

On Thursday, October 2, 2014 12:07:34 PM UTC-7, John Larkin wrote:

On Thu, 02 Oct 2014 11:50:20 -0700, DecadentLinuxUserNumeroUno

DLU1@DecadentLinuxUser.org> wrote:

Oddly, radial leaded glass body diodes, and radial leaded dipped caps
have leads that exhibit rust and magnetic properties. Why the industry
ever tolerated that, I'll never know.

Copper is expensive! Lots of cheap parts have tinned steel leads.

That metallurgy is a little off; you don't ever want copper to contact
silicon directly, it kills the carrier lifetime. More important, 'tinned' contact
springs are the doping scheme for point-contact diodes. The 'tin' is
actually the doping metal, perhaps arsenic, and a heat pulse causes
it to diffuse around the contact point to form the junction.

 

[DecadentLinuxUserNumeroUn]

On Thu, 02 Oct 2014 10:01:08 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> Gave us:

On 10/02/2014 01:24 AM, rickman wrote:
On 10/2/2014 1:04 AM, smbaker@gmail.com wrote:
Would a 1/4 x 1/16 neodymium disc magnet placed adjacent to a pack of
1/4 watt through-hole resistors in storage harm them in any way? I
don't think so, but I figure it's a question worth asking.

I'm brainstorming a new way to organize my unweildy collection of
taped resistors, and have found the perfect storage mechanism, but I
need a little something to keep them in place.

I can't imagine a magnet would harm a resistor. What would make you
think it might? Maybe if the magnet were large enough and you dropped
it on the resistor pack it could cause damage.


If the leads were Kovar, they might get magnetized, but otherwise not.

Cheers

Phil Hobbs

Oddly, radial leaded glass body diodes, and radial leaded dipped caps
have leads that exhibit rust and magnetic properties. Why the industry
ever tolerated that, I'll never know.

 

[John Larkin]

On Thu, 02 Oct 2014 11:50:20 -0700, DecadentLinuxUserNumeroUno
<DLU1@DecadentLinuxUser.org> wrote:

On Thu, 02 Oct 2014 10:01:08 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> Gave us:

On 10/02/2014 01:24 AM, rickman wrote:
On 10/2/2014 1:04 AM, smbaker@gmail.com wrote:
Would a 1/4 x 1/16 neodymium disc magnet placed adjacent to a pack of
1/4 watt through-hole resistors in storage harm them in any way? I
don't think so, but I figure it's a question worth asking.

I'm brainstorming a new way to organize my unweildy collection of
taped resistors, and have found the perfect storage mechanism, but I
need a little something to keep them in place.

I can't imagine a magnet would harm a resistor. What would make you
think it might? Maybe if the magnet were large enough and you dropped
it on the resistor pack it could cause damage.


If the leads were Kovar, they might get magnetized, but otherwise not.

Cheers

Phil Hobbs

Oddly, radial leaded glass body diodes, and radial leaded dipped caps
have leads that exhibit rust and magnetic properties. Why the industry
ever tolerated that, I'll never know.

Copper is expensive! Lots of cheap parts have tinned steel leads.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[Wanderer]

On Thursday, October 2, 2014 4:40:10 PM UTC-4, OldGuy wrote:

It happens that Patrick Chung formulated :

Op-amp instrumentation amplifier is initial input stage of EKG and EEG

instruments due to it's high impedance, very high common-mode rejection

ratio, and very high voltage gain. Read more:

http://www.cirvirlab.com/index.php/tutorials/162-op-amp-instrumentation-amplifier.html

and simulate online:

http://www.cirvirlab.com/simulation/op-amp-instrumentation-amplifier-online.php



Idealized!



Does anyone make an IA IC as good as a AMP05?

I used many AMP05 but that is long gone.

AMP05 was excellent and relatively high freq response.



Do not buy any surplus AMP05 as they are floor sweepings or mismarked.



AD calls it Obsolete but they just do not want to make it any more.

Laser trimming got too expensive I guess. But I would have paid for

it.

TI still makes the Burr Brown INA116U.
http://www.ti.com/sitesearch/docs/universalsearch.tsp?searchTerm=INA116u#linkId=1&src=top

 

[ChesterW]

On 10/2/14, 12:04 AM, smbaker@gmail.com wrote:

Would a 1/4 x 1/16 neodymium disc magnet placed adjacent to a pack of 1/4 watt through-hole resistors in storage harm them in any way? I don't think so, but I figure it's a question worth asking.

I'm brainstorming a new way to organize my unweildy collection of taped resistors, and have found the perfect storage mechanism, but I need a little something to keep them in place.

I try to keep any tools I'll use on SMT parts Degaussed, so I wouldn't
want any purposefully magnetized parts around.

If you build sufficient fun projects, maybe you could use all of the
resistors up. Problem solved.

ChesterW

 

[OldGuy]

It happens that Patrick Chung formulated :

Op-amp instrumentation amplifier is initial input stage of EKG and EEG
instruments due to it's high impedance, very high common-mode rejection
ratio, and very high voltage gain. Read more:
http://www.cirvirlab.com/index.php/tutorials/162-op-amp-instrumentation-amplifier.html
and simulate online:
http://www.cirvirlab.com/simulation/op-amp-instrumentation-amplifier-online.php

Idealized!

Does anyone make an IA IC as good as a AMP05?
I used many AMP05 but that is long gone.
AMP05 was excellent and relatively high freq response.

Do not buy any surplus AMP05 as they are floor sweepings or mismarked.

AD calls it Obsolete but they just do not want to make it any more.
Laser trimming got too expensive I guess. But I would have paid for
it.

 

[Steve Goldstein]

On Thu, 02 Oct 2014 13:40:10 -0700, OldGuy <spamnot@nospam.com> wrote:

It happens that Patrick Chung formulated :
Op-amp instrumentation amplifier is initial input stage of EKG and EEG
instruments due to it's high impedance, very high common-mode rejection
ratio, and very high voltage gain. Read more:
http://www.cirvirlab.com/index.php/tutorials/162-op-amp-instrumentation-amplifier.html
and simulate online:
http://www.cirvirlab.com/simulation/op-amp-instrumentation-amplifier-online.php

Idealized!

Does anyone make an IA IC as good as a AMP05?
I used many AMP05 but that is long gone.
AMP05 was excellent and relatively high freq response.

Do not buy any surplus AMP05 as they are floor sweepings or mismarked.

AD calls it Obsolete but they just do not want to make it any more.
Laser trimming got too expensive I guess. But I would have paid for
it.

For sure it wasn't the cost of laser trimming. Many ADI parts in
current production are laser-trimmed. I know, I've designed some
of them.

The much more likely reason for discontinuance was the cost of fab
transfer. The AMP05 was made on an old and unique-to-the-fab process
in the San Jose fab, which was closed some years ago. High-runner
processes were moved to other fabs, which allowed a number of
products to be moved very easily (once the process was moved, a not
inconsiderable task). In other cases products were redesigned to use
similar existing processes in one of the other fabs (also not cheap).
Discontinued products were those that didn't have sales to justify the
costs of keeping them alive by either process or design migration.

 

[Phil Hobbs]

On 10/2/2014 2:50 PM, DecadentLinuxUserNumeroUno wrote:

On Thu, 02 Oct 2014 10:01:08 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> Gave us:

On 10/02/2014 01:24 AM, rickman wrote:
On 10/2/2014 1:04 AM, smbaker@gmail.com wrote:
Would a 1/4 x 1/16 neodymium disc magnet placed adjacent to a pack of
1/4 watt through-hole resistors in storage harm them in any way? I
don't think so, but I figure it's a question worth asking.

I'm brainstorming a new way to organize my unweildy collection of
taped resistors, and have found the perfect storage mechanism, but I
need a little something to keep them in place.

I can't imagine a magnet would harm a resistor. What would make you
think it might? Maybe if the magnet were large enough and you dropped
it on the resistor pack it could cause damage.


If the leads were Kovar, they might get magnetized, but otherwise not.

Cheers

Phil Hobbs

Oddly, radial leaded glass body diodes, and radial leaded dipped caps
have leads that exhibit rust and magnetic properties. Why the industry
ever tolerated that, I'll never know.

The diodes are easy to understand, because Kovar has the same CTE over
temperature as the glasses they used for encapsulation and hermetic
sealing. Dunno about the caps--maybe they used Kovar or Copperweld
(copper-coated steel) for its mechanical properties. Big dipped caps
have a tendency to fall off due to metal fatigue under vibration, and
steel is probably better than copper.

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

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

 

[Bob Milutinovic]

"DTJ" <asdf@hjkl.com.au> wrote in message
news:bbidnVAIuI9s7KvJnZ2dnUVZ_r2dnZ2d@westnet.com.au...
> http://www.liveleak.com/view?i=0a8_1412839025

Given sufficient current, an iron bolt can become a "fusible link."

Always fun to reproduce failures like this though, for the purposes of
research of course ;-)...

Reminds me of when as a kid I was given a box full of electrolytic
capacitors (family friend worked at Alcatel and knew I was into
electronics); had much fun connecting them to a 12V PSU and standing back.

--
Bob Milutinovic
Cognicom

 

[Clocky]

On 10/10/2014 4:17 PM, Bob Milutinovic wrote:

"DTJ" <asdf@hjkl.com.au> wrote in message
news:bbidnVAIuI9s7KvJnZ2dnUVZ_r2dnZ2d@westnet.com.au...
http://www.liveleak.com/view?i=0a8_1412839025

Given sufficient current, an iron bolt can become a "fusible link."

Always fun to reproduce failures like this though, for the purposes of
research of course ;-)...

Reminds me of when as a kid I was given a box full of electrolytic
capacitors (family friend worked at Alcatel and knew I was into
electronics); had much fun connecting them to a 12V PSU and standing back.

Those non-venting caps sure go off with a bang.

Similarly I was desoldering some chips with a heat gun a while ago when
a cap let go and hit me right above the left eye. I had a perfectly
round red circle to remind me why I always wear safety glasses.

 

[DTJ]

On 10-Oct-14 4:17 PM, Bob Milutinovic wrote:

"DTJ" <asdf@hjkl.com.au> wrote in message
news:bbidnVAIuI9s7KvJnZ2dnUVZ_r2dnZ2d@westnet.com.au...
http://www.liveleak.com/view?i=0a8_1412839025

Given sufficient current, an iron bolt can become a "fusible link."

Always fun to reproduce failures like this though, for the purposes of
research of course ;-)...

Reminds me of when as a kid I was given a box full of electrolytic
capacitors (family friend worked at Alcatel and knew I was into
electronics); had much fun connecting them to a 12V PSU and standing back.

We used to push electros into old style outdoor power points at high
school and then flip the switch on with your foot. Silly, dangerous etc.

 

[Ralph Barone]

"Bob Milutinovic" <cognicom@gmail.com> wrote:

"DTJ" <asdf@hjkl.com.au> wrote in message
news:bbidnVAIuI9s7KvJnZ2dnUVZ_r2dnZ2d@westnet.com.au...
http://www.liveleak.com/view?i=0a8_1412839025

Given sufficient current, an iron bolt can become a "fusible link."

Always fun to reproduce failures like this though, for the purposes of
research of course ;-)...

Reminds me of when as a kid I was given a box full of electrolytic
capacitors (family friend worked at Alcatel and knew I was into
electronics); had much fun connecting them to a 12V PSU and standing back.

The spiral construction of the resistor is quite obvious during the
deconstruction phase. Interesting.

 

On Fri, 10 Oct 2014 19:17:19 +1100, "Bob Milutinovic"
<cognicom@gmail.com> wrote:

"DTJ" <asdf@hjkl.com.au> wrote in message
news:bbidnVAIuI9s7KvJnZ2dnUVZ_r2dnZ2d@westnet.com.au...
http://www.liveleak.com/view?i=0a8_1412839025

Given sufficient current, an iron bolt can become a "fusible link."

Always fun to reproduce failures like this though, for the purposes of
research of course ;-)...

Reminds me of when as a kid I was given a box full of electrolytic
capacitors (family friend worked at Alcatel and knew I was into
electronics); had much fun connecting them to a 12V PSU and standing back.

Connecting a beer can sized electrolytic directly to the 220 Vac mains
will cause also a nice bang. Do this outdoors (smell) and use eye
protection.

I once connected 220 Vac directly to a fluorescent starter (glim lamp)
and created my first plasma rocket flying a few meters. It is just
rocket science