Conical inductors--still $10!...

[server]

On Wed, 15 Jul 2020 09:16:36 +0100, Martin Brown
<\'\'\'newspam\'\'\'@nezumi.demon.co.uk> wrote:

On 14/07/2020 22:43, John Larkin wrote:
On Tue, 14 Jul 2020 21:16:22 +0200, David Brown
david.brown@hesbynett.no> wrote:

On 14/07/2020 19:50, John Larkin wrote:


Looks like it has burned out in New York, as it did in many European
countries. You can\'t have 20% of a population infected, for two or
three weeks each maybe, forever, even if the herd immunity level were
100%. Which of course it isn\'t.

That all depends on what you are thinking about by \"burned out\". What
happens is that it spreads rapidly in places where it has got a foothold
and where a sizeable proportion of the populace are not taking sensible
precautions (either on their own, or because the authorities have
imposed restrictions and lockdowns). Eventually it dawns on the people
in charge that there is a problem brewing, and then it gradually dawns
on the people themselves. As people limit their interactions, are more
careful with hygiene, etc., the rate of spreading decreases. But for a
while the number of infections still increases, especially as there is a
lag in between infection and realising that you have it. Once you have
got to the point where everyone is staying in doors and keeping separate
as much as possible, the infection slows and gradually new cases decreases.

Do they stay indoors forever?

We may have to continue fairly aggressive social distancing and
additional precautions to prevent transmission rising again at least
until an effective vaccine is found and deployed in bulk.

We will probably have a decent vaccine soon. Tons of people are
working on it. We just never tried seriously to make a corona virus
vaccine before.

It isn\'t staying indoors! It is staying away from other people and
wearing a face mask when you are unavoidably too close to others (mainly
to protect them from you). UK is making face coverings mandatory in
shops from next week (after a very shaky start - a government spokesman
was saying exactly the opposite on Sunday morning news interviews).

But if you think \"burned out\" means people ignore the virus and it goes
away by itself, then you are clearly wrong. (Well, \"clearly\" to anyone
who cares to pay attention or apply a little thought.)

Why clearly wrong? Can 100% of a population catch this virus? 400% ?

We already know that the population vulnerability is *at least* 87% from
that hapless choir who had a symptomatic carrier in their midst.

Cool. The survivors are immune. They should volunteer to work in
nursing homes, and save some lives.

You seem completely unable to grasp the very simple fact that you have
to be exposed to the virus before you can catch it.

Now don\'t be a fathead. Try thinking once in a while maybe.

Once everyone in

America has been exposed and recovered we will be able to tell how
sensible or otherwise US policy has been (Brazil will get there first).

The characteristic new-case waveform seems to be a rounded hump (dare
I say Gaussian?) of width 5 weeks or so. Lockdowns no doubt extend the
tail and cause secondary blips when inevitably mis-managed.

Lockdowns are why you have a tail at all in this period, rather than
continuing to have /more/ infections for a much longer period.

Or the same number of infections in a short period. Maybe even fewer
total infections.

We can watch and wait as the southern righttard states

Nobody like mindless bigots either.

exercise their

constitutional freedom to catch Covid-19. Only Brazil is making a more
serious balls up of handling the pandemic than the USA. Both have a very
long way to go before the infection gets anywhere near herd immunity.

Some recent estimates by \"experts\" put herd immunity as low as 20%.
Sounds reasonable to me.

If you do nothing with business as usual you will see exponential growth
with a characteristic doubling time of about 3 days.

In that case, we\'re all dead. But the growth soon stops being
exponential and peaks and declines. Look it up.


That was what

happened in the UK until they switched into lockdown. It is calculated
that locking down one week sooner would have halved the death toll and
meant a shorter lockdown period to get back to a traceable baseline
level. That is assuming the government managed to get track and trace
right (they didn\'t and the much vaunted UK world beating app sank
without trace).

The up-swing in the US south may well be caused by air conditioning.

Influenced by, perhaps, but not /caused/ by. The blame lies with the
idiot authorities who opened up far too fast, far too much and far too soon.

Again, should they lock down forever? Opening gradually (or rather,
opening politically) just creates a long tail, with panic driven
bumps.

Not exactly. You need a decent track and trace system that can close
down any local infections before they escape back into full community
transmission. This is more easily done in societies like Japan and Korea
where people trust their government and are compliant with advice. And
in China where the population have no choice but to obey the government.

USA people seem to wilfully go out of their way to court disaster.

Not much, but I think we are much less afraid, and unimpressed by
authority, than most places. Selective migration did that. I wonder if
recklessness is hereditary.

The UK has actually been surprisingly compliant with lockdown much to
everyone\'s surprise (PM\'s chief adviser being a notable exception).

Latest data suggests they had R ~ 0.57 in May just prior to unlocking
(but unlocked too soon). Flare ups so far have been in the dodgy
sweatshop rag trade and fruit pickers - both places failing to obey
social distancing or even basic UK sanitary and hygiene regulations. It
will be interesting to see if any prosecutions result.

The virus is exceptionally good at finding opportunities in the
overcrowded slum areas mainly targetting the weak and the poor - pretty
much like TB did in the Victorian era.

All those sequestered people are fresh meat to keep the virus alive.
Like adding fuel slowly to a bonfire.

https://www.oxfam.org/en/press-releases/12000-people-day-could-die-covid-19-linked-hunger-end-year-potentially-more-disease

The starvation that results from the lockdowns will outlast the virus.

The long term damage the lockdowns do will certainly be in the same
ballpark as the fatalities from the pandemic - they might even be worse
since we are not out of the woods yet. The economic damage is very
serious and it is unclear how to unlockdown without ending up back in
the same bid with rising infection rates again. The vaccine is still
some way off and it is unclear whether or not it will even work.

I wonder why no Top Economists predicted the economic fallout, here
and in poor countries. What are economists for?

The lockdown thing was and is grossly mismanaged. People under 40 have
a tiny mortality from this virus, and they could keep working. Spend
the trillions to protect the vulnerable; we mostly know who they are.

If our lockdowns kill more people in poor countries than they save in
mostly white developed countries (and they may not even save lives
here) then the lockdowns are racist genocide. Do Black Lives Matter in
Africa?

Even in Australia where they had got it under apparently tight control
and minor slip up and Melbourne is back in lockdown:

https://www.forbes.com/sites/tamarathiessen/2020/07/07/australia-coronavirus-melbourne-lockdown-hotel-sex-scandal/#57093425131d

There is another interesting line of research recently reported by
trying to subvert much simpler antibodies from llamas for use as a
treatment in humans. Oxford university reported it in Nature last week.

https://metro.co.uk/2020/07/14/llama-antibodies-help-neutralise-coronavirus-study-says-12983699/

More technical details:
https://www.nature.com/articles/s41594-020-0469-6

I\'d rather catch this thing and take my chances to live or die, than
see myself and my family slowly starve to death.

Your choice of course but if you are male and over 60 be very careful
what you wish for. Take a very good look at the age related IFR first.

Yes, my choice. I am keeping my business alive and my employees paid.
And sending some fraction of our profits to fund life-changing and
life-saving medical care in Africa. If that kills me, lives are still
net saved.

Sensible countries run their essential systems so that utilities and
food production remain available. Pretty much everything else in the UK
was shut down until about a week ago. Many office workers have found
that they can work from home more effectively than in the office - fewer
distractions and no early starts for a tedious commute into the city.

If many workers continue to work from home, which I think they will,
workers need not pack into dense, expensive cities. Don\'t invest in
WeWork.




--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Wed, 15 Jul 2020 09:16:36 +0100, Martin Brown
<\'\'\'newspam\'\'\'@nezumi.demon.co.uk> wrote:

On 14/07/2020 22:43, John Larkin wrote:
On Tue, 14 Jul 2020 21:16:22 +0200, David Brown
david.brown@hesbynett.no> wrote:

On 14/07/2020 19:50, John Larkin wrote:


Looks like it has burned out in New York, as it did in many European
countries. You can\'t have 20% of a population infected, for two or
three weeks each maybe, forever, even if the herd immunity level were
100%. Which of course it isn\'t.

That all depends on what you are thinking about by \"burned out\". What
happens is that it spreads rapidly in places where it has got a foothold
and where a sizeable proportion of the populace are not taking sensible
precautions (either on their own, or because the authorities have
imposed restrictions and lockdowns). Eventually it dawns on the people
in charge that there is a problem brewing, and then it gradually dawns
on the people themselves. As people limit their interactions, are more
careful with hygiene, etc., the rate of spreading decreases. But for a
while the number of infections still increases, especially as there is a
lag in between infection and realising that you have it. Once you have
got to the point where everyone is staying in doors and keeping separate
as much as possible, the infection slows and gradually new cases decreases.

Do they stay indoors forever?

We may have to continue fairly aggressive social distancing and
additional precautions to prevent transmission rising again at least
until an effective vaccine is found and deployed in bulk.

We will probably have a decent vaccine soon. Tons of people are
working on it. We just never tried seriously to make a corona virus
vaccine before.

It isn\'t staying indoors! It is staying away from other people and
wearing a face mask when you are unavoidably too close to others (mainly
to protect them from you). UK is making face coverings mandatory in
shops from next week (after a very shaky start - a government spokesman
was saying exactly the opposite on Sunday morning news interviews).

But if you think \"burned out\" means people ignore the virus and it goes
away by itself, then you are clearly wrong. (Well, \"clearly\" to anyone
who cares to pay attention or apply a little thought.)

Why clearly wrong? Can 100% of a population catch this virus? 400% ?

We already know that the population vulnerability is *at least* 87% from
that hapless choir who had a symptomatic carrier in their midst.

Cool. The survivors are immune. They should volunteer to work in
nursing homes, and save some lives.

You seem completely unable to grasp the very simple fact that you have
to be exposed to the virus before you can catch it.

Now don\'t be a fathead. Try thinking once in a while maybe.

Once everyone in

America has been exposed and recovered we will be able to tell how
sensible or otherwise US policy has been (Brazil will get there first).

The characteristic new-case waveform seems to be a rounded hump (dare
I say Gaussian?) of width 5 weeks or so. Lockdowns no doubt extend the
tail and cause secondary blips when inevitably mis-managed.

Lockdowns are why you have a tail at all in this period, rather than
continuing to have /more/ infections for a much longer period.

Or the same number of infections in a short period. Maybe even fewer
total infections.

We can watch and wait as the southern righttard states

Nobody like mindless bigots either.

exercise their

constitutional freedom to catch Covid-19. Only Brazil is making a more
serious balls up of handling the pandemic than the USA. Both have a very
long way to go before the infection gets anywhere near herd immunity.

Some recent estimates by \"experts\" put herd immunity as low as 20%.
Sounds reasonable to me.

If you do nothing with business as usual you will see exponential growth
with a characteristic doubling time of about 3 days.

In that case, we\'re all dead. But the growth soon stops being
exponential and peaks and declines. Look it up.


That was what

happened in the UK until they switched into lockdown. It is calculated
that locking down one week sooner would have halved the death toll and
meant a shorter lockdown period to get back to a traceable baseline
level. That is assuming the government managed to get track and trace
right (they didn\'t and the much vaunted UK world beating app sank
without trace).

The up-swing in the US south may well be caused by air conditioning.

Influenced by, perhaps, but not /caused/ by. The blame lies with the
idiot authorities who opened up far too fast, far too much and far too soon.

Again, should they lock down forever? Opening gradually (or rather,
opening politically) just creates a long tail, with panic driven
bumps.

Not exactly. You need a decent track and trace system that can close
down any local infections before they escape back into full community
transmission. This is more easily done in societies like Japan and Korea
where people trust their government and are compliant with advice. And
in China where the population have no choice but to obey the government.

USA people seem to wilfully go out of their way to court disaster.

Not much, but I think we are much less afraid, and unimpressed by
authority, than most places. Selective migration did that. I wonder if
recklessness is hereditary.

The UK has actually been surprisingly compliant with lockdown much to
everyone\'s surprise (PM\'s chief adviser being a notable exception).

Latest data suggests they had R ~ 0.57 in May just prior to unlocking
(but unlocked too soon). Flare ups so far have been in the dodgy
sweatshop rag trade and fruit pickers - both places failing to obey
social distancing or even basic UK sanitary and hygiene regulations. It
will be interesting to see if any prosecutions result.

The virus is exceptionally good at finding opportunities in the
overcrowded slum areas mainly targetting the weak and the poor - pretty
much like TB did in the Victorian era.

All those sequestered people are fresh meat to keep the virus alive.
Like adding fuel slowly to a bonfire.

https://www.oxfam.org/en/press-releases/12000-people-day-could-die-covid-19-linked-hunger-end-year-potentially-more-disease

The starvation that results from the lockdowns will outlast the virus.

The long term damage the lockdowns do will certainly be in the same
ballpark as the fatalities from the pandemic - they might even be worse
since we are not out of the woods yet. The economic damage is very
serious and it is unclear how to unlockdown without ending up back in
the same bid with rising infection rates again. The vaccine is still
some way off and it is unclear whether or not it will even work.

I wonder why no Top Economists predicted the economic fallout, here
and in poor countries. What are economists for?

The lockdown thing was and is grossly mismanaged. People under 40 have
a tiny mortality from this virus, and they could keep working. Spend
the trillions to protect the vulnerable; we mostly know who they are.

If our lockdowns kill more people in poor countries than they save in
mostly white developed countries (and they may not even save lives
here) then the lockdowns are racist genocide. Do Black Lives Matter in
Africa?

Even in Australia where they had got it under apparently tight control
and minor slip up and Melbourne is back in lockdown:

https://www.forbes.com/sites/tamarathiessen/2020/07/07/australia-coronavirus-melbourne-lockdown-hotel-sex-scandal/#57093425131d

There is another interesting line of research recently reported by
trying to subvert much simpler antibodies from llamas for use as a
treatment in humans. Oxford university reported it in Nature last week.

https://metro.co.uk/2020/07/14/llama-antibodies-help-neutralise-coronavirus-study-says-12983699/

More technical details:
https://www.nature.com/articles/s41594-020-0469-6

I\'d rather catch this thing and take my chances to live or die, than
see myself and my family slowly starve to death.

Your choice of course but if you are male and over 60 be very careful
what you wish for. Take a very good look at the age related IFR first.

Yes, my choice. I am keeping my business alive and my employees paid.
And sending some fraction of our profits to fund life-changing and
life-saving medical care in Africa. If that kills me, lives are still
net saved.

Sensible countries run their essential systems so that utilities and
food production remain available. Pretty much everything else in the UK
was shut down until about a week ago. Many office workers have found
that they can work from home more effectively than in the office - fewer
distractions and no early starts for a tedious commute into the city.

If many workers continue to work from home, which I think they will,
workers need not pack into dense, expensive cities. Don\'t invest in
WeWork.




--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[Joe Gwinn]

On Wed, 15 Jul 2020 09:18:11 +0100, Michael Kellett <mk@mkesc.co.uk>
wrote:

Found this on \"All about Ciruits\" -

https://www.allaboutcircuits.com/news/micron-digital-claims-to-have-eliminated-drifting-in-imus/?utm_source=All+About+Circuits+Members&utm_campaign=a3e890e124-EMAIL_CAMPAIGN_2020_07_09_11_04_COPY_02&utm_medium=email&utm_term=0_2565529c4b-a3e890e124-280503221

It takes you here:

http://www.romos.io/index.asp?FPFHFGFHIRJEIJILIG

They claim an inertial measuring breakthrough:

\"Once initialized, ROMOS will experience a maximum of 0.5mm static
variance offset from true position data over its operational lifetime.\"

With a dose of snake oil.

\"Using higher dimensional computations with back-propagation, Drift is
also eliminated from positional data.\"

This sounds like the standard 6-state or 9-state Kalman Filter. They
do work in big vector spaces.

External references are also provided to this Kalman Filter.

The information to cancel drift is not in the IMU data, so software
can do nothing to cancel drift from IMU data alone.

There is an absurd video too.

It\'s way to good (by many orders of magnitude) to be true - but what\'s
the point ?

How do they make money, are they hoping to trap just one lunatic venture
capitalist ?

I would think that a direct test would end the game, so I don\'t see
how even a lunatic investor could be fooled for long.

Micron Dynamics claims that the technology is patented, so I sent an
email asking for patent numbers.


Joe Gwinn

 

[Joe Gwinn]

On Wed, 15 Jul 2020 09:18:11 +0100, Michael Kellett <mk@mkesc.co.uk>
wrote:

Found this on \"All about Ciruits\" -

https://www.allaboutcircuits.com/news/micron-digital-claims-to-have-eliminated-drifting-in-imus/?utm_source=All+About+Circuits+Members&utm_campaign=a3e890e124-EMAIL_CAMPAIGN_2020_07_09_11_04_COPY_02&utm_medium=email&utm_term=0_2565529c4b-a3e890e124-280503221

It takes you here:

http://www.romos.io/index.asp?FPFHFGFHIRJEIJILIG

They claim an inertial measuring breakthrough:

\"Once initialized, ROMOS will experience a maximum of 0.5mm static
variance offset from true position data over its operational lifetime.\"

With a dose of snake oil.

\"Using higher dimensional computations with back-propagation, Drift is
also eliminated from positional data.\"

This sounds like the standard 6-state or 9-state Kalman Filter. They
do work in big vector spaces.

External references are also provided to this Kalman Filter.

The information to cancel drift is not in the IMU data, so software
can do nothing to cancel drift from IMU data alone.

There is an absurd video too.

It\'s way to good (by many orders of magnitude) to be true - but what\'s
the point ?

How do they make money, are they hoping to trap just one lunatic venture
capitalist ?

I would think that a direct test would end the game, so I don\'t see
how even a lunatic investor could be fooled for long.

Micron Dynamics claims that the technology is patented, so I sent an
email asking for patent numbers.


Joe Gwinn

 

[Joe Gwinn]

On Wed, 15 Jul 2020 09:18:11 +0100, Michael Kellett <mk@mkesc.co.uk>
wrote:

Found this on \"All about Ciruits\" -

https://www.allaboutcircuits.com/news/micron-digital-claims-to-have-eliminated-drifting-in-imus/?utm_source=All+About+Circuits+Members&utm_campaign=a3e890e124-EMAIL_CAMPAIGN_2020_07_09_11_04_COPY_02&utm_medium=email&utm_term=0_2565529c4b-a3e890e124-280503221

It takes you here:

http://www.romos.io/index.asp?FPFHFGFHIRJEIJILIG

They claim an inertial measuring breakthrough:

\"Once initialized, ROMOS will experience a maximum of 0.5mm static
variance offset from true position data over its operational lifetime.\"

With a dose of snake oil.

\"Using higher dimensional computations with back-propagation, Drift is
also eliminated from positional data.\"

This sounds like the standard 6-state or 9-state Kalman Filter. They
do work in big vector spaces.

External references are also provided to this Kalman Filter.

The information to cancel drift is not in the IMU data, so software
can do nothing to cancel drift from IMU data alone.

There is an absurd video too.

It\'s way to good (by many orders of magnitude) to be true - but what\'s
the point ?

How do they make money, are they hoping to trap just one lunatic venture
capitalist ?

I would think that a direct test would end the game, so I don\'t see
how even a lunatic investor could be fooled for long.

Micron Dynamics claims that the technology is patented, so I sent an
email asking for patent numbers.


Joe Gwinn

 

[server]

On Wed, 15 Jul 2020 11:44:17 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:

They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.

Joe Gwinn

Ours is red! It\'s a really good machine. As is the Dyson vacuum
cleaner.

It\'s a pleasure to, once in a while, see some really good engineering.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Wed, 15 Jul 2020 11:44:17 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:

They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.

Joe Gwinn

Ours is red! It\'s a really good machine. As is the Dyson vacuum
cleaner.

It\'s a pleasure to, once in a while, see some really good engineering.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Wed, 15 Jul 2020 11:44:17 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:

They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.

Joe Gwinn

Ours is red! It\'s a really good machine. As is the Dyson vacuum
cleaner.

It\'s a pleasure to, once in a while, see some really good engineering.



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[Jim Jackson]

Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.

I think you will find a zener to be worse than a LED

 

[Jim Jackson]

Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.

I think you will find a zener to be worse than a LED

 

[Jim Jackson]

Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.

I think you will find a zener to be worse than a LED

 

[server]

On Wed, 15 Jul 2020 16:19:01 -0000 (UTC), Jim Jackson
<jj@iridium.wf32df> wrote:

Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.

I think you will find a zener to be worse than a LED

Low voltage zeners are very soft. Above about 7 volts, they leak just
nanoamps right below the zener voltage.

(Yes, we call all those things \"zener diodes\")



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Wed, 15 Jul 2020 16:19:01 -0000 (UTC), Jim Jackson
<jj@iridium.wf32df> wrote:

Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.

I think you will find a zener to be worse than a LED

Low voltage zeners are very soft. Above about 7 volts, they leak just
nanoamps right below the zener voltage.

(Yes, we call all those things \"zener diodes\")



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

On Wed, 15 Jul 2020 16:19:01 -0000 (UTC), Jim Jackson
<jj@iridium.wf32df> wrote:

Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.

I think you will find a zener to be worse than a LED

Low voltage zeners are very soft. Above about 7 volts, they leak just
nanoamps right below the zener voltage.

(Yes, we call all those things \"zener diodes\")



--

John Larkin Highland Technology, Inc

Science teaches us to doubt.

Claude Bernard

 

[server]

> Just like with Tesla stock at 1500 I won\'t buy it and I won\'t go short either,

Yes, they need to shut down Fremont factory immediately:

https://sanfrancisco.cbslocal.com/2020/07/14/coronavirus-tesla-workers-speak-out-after-industry-blog-reports-dozens-of-workers-tested-positive-for-covid-19/

 

[server]

> Just like with Tesla stock at 1500 I won\'t buy it and I won\'t go short either,

Yes, they need to shut down Fremont factory immediately:

https://sanfrancisco.cbslocal.com/2020/07/14/coronavirus-tesla-workers-speak-out-after-industry-blog-reports-dozens-of-workers-tested-positive-for-covid-19/

 

[Pimpom]

On 7/15/2020 9:14 PM, Joe Gwinn wrote:

On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:

They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.

I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.

 

[Pimpom]

On 7/15/2020 9:14 PM, Joe Gwinn wrote:

On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:

They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.

I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.

 

[server]

> Just like with Tesla stock at 1500 I won\'t buy it and I won\'t go short either,

Yes, they need to shut down Fremont factory immediately:

https://sanfrancisco.cbslocal.com/2020/07/14/coronavirus-tesla-workers-speak-out-after-industry-blog-reports-dozens-of-workers-tested-positive-for-covid-19/

 

[server]

On Wednesday, July 15, 2020 at 12:16:45 AM UTC-4, Bill Sloman wrote:

Today\'s Proceedings of the (US) National Academy of Sciences has this paper

https://www.pnas.org/content/pnas/early/2020/06/23/2006048117.full.pdf

Apparently if you spend time spelling out what exponential growth really means, even conservatives become more willing to take social distancing seriously.

It probably won\'t work on John Larkin who is really resistant to having things spelled out for him, and wouldn\'t work for Trump, who hasn\'t got a long enough attention span to let him absorb the message.

--
Bill Sloman, Sydney

Trying to \"educate\" people about exponential growth with an obtuse paper is not a good strategy. What is the takeaway in a couple of sentences?