Eddie Currents

[Sjouke Burry]

On 15.10.19 21:19, John Larkin wrote:

On Tue, 15 Oct 2019 10:41:41 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

tirsdag den 15. oktober 2019 kl. 19.27.03 UTC+2 skrev John Larkin:
On Tue, 15 Oct 2019 17:01:09 +0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org wrote:

jlarkin@highlandsniptechnology.com wrote in
news:5vsbqeh2g8jddc05jb0g7omjvlj11t4u93@4ax.com:

On Tue, 15 Oct 2019 10:58:56 -0500, amdx <nojunk@knology.net
wrote:

On 10/15/2019 8:59 AM, jlarkin@highlandsniptechnology.com wrote:
On Tue, 15 Oct 2019 01:20:02 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-14 23:11, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.


Where have you been? Eddie Current is famous for inventing the
LVDT : "Linear Voltage Displacement Transformer", according to
the article.

https://www.electronicdesign.com/analog/11-myths-about-inductiv
e-position-sensors

See Fig 1.

I remember when Electronic Design often made sense.

Most recently around 1995, iirc.

Cheers

Phil Hobbs
(Who BITD learned a fair amount from ED, EDN, and especially RF
Design.)

I thought you might enjoy the single-winding transformer and its
interesting field lines.


I am assuming you noticed that half of the lines of force are
drawn
incorrectly? Or did my 11th grade electronics course fail me?

They cancel to zero field at the center of the coil.


It looks like two turns on the primary, and I wish they had
shown the
secondaries.

It's a transformer. It doesn't have secondaries!

On the electric vehicle, how well is a compass going to work?
Ask
just to say I once had a dash mounted compass, I had to cross a
bridge to and from work, When I drove at 40mph across the bridge,
the compass would make a full 90* swivel before coming back to
proper orientation.
If I went faster it didn't quite make the 90*.
Mikek





The compass in my Audi rear-view mirror usually works pretty well,


That is where the readout is. Most likely it is coming from the
GPS in the car and getting piped to the mirror via BT or wires along
with the power. There is a chance that they put a compass cicuit in
the mirror, but it makes more sense to use the GPS as conflicting
outputs might get noted.

Does GPS give compass direction? How does that work?


I don't see how unless you have more than one antenna and calculate from that



but a steel bridge might mess up any magnetic compass. There is a
drive-in-circles cal procedure that I haven't tried.

Your audi have a map display? If so, I would bet the mirror is
just reading out what that gathers.

Yes, it has GPS and map. But how does it know direction?

probably with one of the numerous 3 axis magnetic sensor ICs


GPS can determine compass direction if the car is in motion, if GPS
tracks its location, and you assume the car is pointed in the
direction that it is going.

I doubt anyone has actually done that.

Used that method 15+ years ago in an instrumented car
for research.

 

[Steve Wilson]

John Larkin <jlarkin@highland_atwork_technology.com> wrote:

GPS can determine compass direction if the car is in motion, if GPS
tracks its location, and you assume the car is pointed in the
direction that it is going.

I doubt anyone has actually done that.

I think that's how my Garmin works. When I start my car and move a few feet,
it knows exactly which direction to steer to get on track to my destination.

Very simple idea, actually.

 

John Larkin <jlarkin@highland_atwork_technology.com> wrote in
news:u50cqep23epd9uncoqatmh5lclb9if049q@4ax.com:

Does GPS give compass direction? How does that work?

It has a GPS chip in it and a GPS antenna somewhere on the car.
Nowadays that is a 1 icnh square by 1/4 inch thick metallized ceramic
pad.

Here is the one I integrated into one of my designs. My 3D
rendering, in fact. It is a 3D pdf so may not/does not work with all
non-adobe readers.

<http://www.mediafire.com/file/wa09u41j6392shk/GPS_Antenna_Assembly.pdf
/file>

 

John Larkin <jlarkin@highland_atwork_technology.com> wrote in
news:u50cqep23epd9uncoqatmh5lclb9if049q@4ax.com:

Does GPS give compass direction? How does that work?

My PHONE has GPS, but I am pretty sure that the GPS Circuit Package
phones incorporate includes an inertial sensor, and a tilt sensor and
a compass sensor, likely all in one chip (though some of those are
MEMS based so maybe a few chips on a board segment).

Regardless, all I KNOW is that when I have Google maps up on my
phone, I can see my position and when I rotate, I can see the
headlight rotate and thereby see my direction with respect to the
map's compass. And Google maps is 100% reliant on GPS as it relates
to showing you where you are at. You do know what "the headlight" is
on a map's GPS location indicator is, right?

 

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:39edcb7e-6ffc-488d-9e21-9ae819a516c2@googlegroups.com:

I don't see how unless you have more than one antenna and
calculate from that

Most GPS calculate direction of travel based on movement and assume
the direction you are facing. You phone, however, is 'indexed'. So
the direction you face it (while horizontal or near so)gets noted and
worked from. It may also need to be on the move to get it right.

All I know is that I can put a map up on the phone, and face the
top of the phone in the direction of travel and it notes it. Then I
can rotae it and it catches said rotation immediately.

SO *I* made some assumptions about what all must be incorporated
into a GPS circuit in a phone, AND I also have an app which has a
plumb bob and compass and all other manner of stuff, and one must
allow access or it doesn't work. So I *THINK* my assumptions are
right, BUT we are in S.E.D., so... I am sure of one thing... I will
get the standard railing for this.

 

[Lasse Langwadt Christense]

onsdag den 16. oktober 2019 kl. 00.32.26 UTC+2 skrev DecadentLinux...@decadence.org:

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:39edcb7e-6ffc-488d-9e21-9ae819a516c2@googlegroups.com:

I don't see how unless you have more than one antenna and
calculate from that


Most GPS calculate direction of travel based on movement and assume
the direction you are facing. You phone, however, is 'indexed'. So
the direction you face it (while horizontal or near so)gets noted and
worked from. It may also need to be on the move to get it right.

All I know is that I can put a map up on the phone, and face the
top of the phone in the direction of travel and it notes it. Then I
can rotae it and it catches said rotation immediately.

SO *I* made some assumptions about what all must be incorporated
into a GPS circuit in a phone, AND I also have an app which has a
plumb bob and compass and all other manner of stuff, and one must
allow access or it doesn't work. So I *THINK* my assumptions are
right, BUT we are in S.E.D., so... I am sure of one thing... I will
get the standard railing for this.

my ancient Samsung can show compass heading regards of whether GPS is on or not

 

[John Larkin]

On Tue, 15 Oct 2019 15:55:57 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

onsdag den 16. oktober 2019 kl. 00.32.26 UTC+2 skrev DecadentLinux...@decadence.org:
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:39edcb7e-6ffc-488d-9e21-9ae819a516c2@googlegroups.com:

I don't see how unless you have more than one antenna and
calculate from that


Most GPS calculate direction of travel based on movement and assume
the direction you are facing. You phone, however, is 'indexed'. So
the direction you face it (while horizontal or near so)gets noted and
worked from. It may also need to be on the move to get it right.

All I know is that I can put a map up on the phone, and face the
top of the phone in the direction of travel and it notes it. Then I
can rotae it and it catches said rotation immediately.

SO *I* made some assumptions about what all must be incorporated
into a GPS circuit in a phone, AND I also have an app which has a
plumb bob and compass and all other manner of stuff, and one must
allow access or it doesn't work. So I *THINK* my assumptions are
right, BUT we are in S.E.D., so... I am sure of one thing... I will
get the standard railing for this.

my ancient Samsung can show compass heading regards of whether GPS is on or not

Wave a magnet around it.

 

[Lasse Langwadt Christense]

onsdag den 16. oktober 2019 kl. 01.12.33 UTC+2 skrev John Larkin:

On Tue, 15 Oct 2019 15:55:57 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

onsdag den 16. oktober 2019 kl. 00.32.26 UTC+2 skrev DecadentLinux...@decadence.org:
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:39edcb7e-6ffc-488d-9e21-9ae819a516c2@googlegroups.com:

I don't see how unless you have more than one antenna and
calculate from that


Most GPS calculate direction of travel based on movement and assume
the direction you are facing. You phone, however, is 'indexed'. So
the direction you face it (while horizontal or near so)gets noted and
worked from. It may also need to be on the move to get it right.

All I know is that I can put a map up on the phone, and face the
top of the phone in the direction of travel and it notes it. Then I
can rotae it and it catches said rotation immediately.

SO *I* made some assumptions about what all must be incorporated
into a GPS circuit in a phone, AND I also have an app which has a
plumb bob and compass and all other manner of stuff, and one must
allow access or it doesn't work. So I *THINK* my assumptions are
right, BUT we are in S.E.D., so... I am sure of one thing... I will
get the standard railing for this.

my ancient Samsung can show compass heading regards of whether GPS is on or not

Wave a magnet around it.

as expected for a compass it makes it go nuts ..

 

[Phil Hobbs]

On 2019-10-15 11:06, jlarkin@highlandsniptechnology.com wrote:

On Tue, 15 Oct 2019 01:20:02 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-14 23:11, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.


Where have you been? Eddie Current is famous for inventing the LVDT :
"Linear Voltage Displacement Transformer", according to the article.

https://www.electronicdesign.com/analog/11-myths-about-inductive-position-sensors

See Fig 1.

I remember when Electronic Design often made sense.

Most recently around 1995, iirc.

Cheers

Phil Hobbs
(Who BITD learned a fair amount from ED, EDN, and especially RF Design.)

Remember bingo cards? The mags and the cards kept us up to date.

Yup. Back when it actually cost something to send product info, they
targeted it a lot more carefully.

When I was a young teenager I had a subscription to the Motorola Update
program--four times a year I got a box full of all the databooks and
apps manuals they'd published that quarter. It was stuff like COS/MOS
MSI, bipolar memory, bit-slice ALUs, MC6800 peripherals, CATV
amplifiers, and so forth. Made my fourteen-year-old-self feel like a
real guy.

Given the importance of the electronics industry, the publications are
now disgraceful. They might hire some retired-actual-EEs to check
their stuff before they publish.

They might die of laughter (or maybe boredom). Steve Woodward is long gone.

The microwave and optics and aerospace mags are still good.

Microwaves and RF relies pretty heavily on advertisers for copy these days.

I am relieved to learn that inductive sensors don't measure
inductance.

I also really liked Circuit Cellar when Steve Ciarcia was running it.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

On Tue, 15 Oct 2019 12:19:02 -0700, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Tue, 15 Oct 2019 10:41:41 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

tirsdag den 15. oktober 2019 kl. 19.27.03 UTC+2 skrev John Larkin:
On Tue, 15 Oct 2019 17:01:09 +0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org wrote:

jlarkin@highlandsniptechnology.com wrote in
news:5vsbqeh2g8jddc05jb0g7omjvlj11t4u93@4ax.com:

On Tue, 15 Oct 2019 10:58:56 -0500, amdx <nojunk@knology.net
wrote:

On 10/15/2019 8:59 AM, jlarkin@highlandsniptechnology.com wrote:
On Tue, 15 Oct 2019 01:20:02 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-14 23:11, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.


Where have you been? Eddie Current is famous for inventing the
LVDT : "Linear Voltage Displacement Transformer", according to
the article.

https://www.electronicdesign.com/analog/11-myths-about-inductiv
e-position-sensors

See Fig 1.

I remember when Electronic Design often made sense.

Most recently around 1995, iirc.

Cheers

Phil Hobbs
(Who BITD learned a fair amount from ED, EDN, and especially RF
Design.)

I thought you might enjoy the single-winding transformer and its
interesting field lines.


I am assuming you noticed that half of the lines of force are
drawn
incorrectly? Or did my 11th grade electronics course fail me?

They cancel to zero field at the center of the coil.


It looks like two turns on the primary, and I wish they had
shown the
secondaries.

It's a transformer. It doesn't have secondaries!

On the electric vehicle, how well is a compass going to work?
Ask
just to say I once had a dash mounted compass, I had to cross a
bridge to and from work, When I drove at 40mph across the bridge,
the compass would make a full 90* swivel before coming back to
proper orientation.
If I went faster it didn't quite make the 90*.
Mikek





The compass in my Audi rear-view mirror usually works pretty well,


That is where the readout is. Most likely it is coming from the
GPS in the car and getting piped to the mirror via BT or wires along
with the power. There is a chance that they put a compass cicuit in
the mirror, but it makes more sense to use the GPS as conflicting
outputs might get noted.

Does GPS give compass direction? How does that work?


I don't see how unless you have more than one antenna and calculate from that



but a steel bridge might mess up any magnetic compass. There is a
drive-in-circles cal procedure that I haven't tried.

Your audi have a map display? If so, I would bet the mirror is
just reading out what that gathers.

Yes, it has GPS and map. But how does it know direction?

probably with one of the numerous 3 axis magnetic sensor ICs


GPS can determine compass direction if the car is in motion, if GPS
tracks its location, and you assume the car is pointed in the
direction that it is going.

I doubt anyone has actually done that.

It's common to use dead reckoning to fill in GPS information. It's
often assumed you're driving on the highway. ;-) A couple of curves
matching the map improves accuracy quite a bit.

 

[Robert Baer]

Eddie who? Brother to Siegfreid?
Is Eddie still currently circulating amongst the magnates?
Or is he potentially unemployed?

 

[Robert Baer]

bitrex wrote:

On 10/14/19 11:11 PM, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.

https://www.electronicdesign.com/analog/11-myths-about-inductive-position-sensors


See Fig 1.

I remember when Electronic Design often made sense.



Eddie Currents possibly associated with the notorious Eddie Coyle:

https://www.youtube.com/watch?v=vWdqoPHW-F8



Not playable.

 

On Tue, 15 Oct 2019 20:44:05 -0800, Robert Baer
<robertbaer@localnet.com> wrote:

Eddie who? Brother to Siegfreid?
Is Eddie still currently circulating amongst the magnates?
Or is he potentially unemployed?

He's hiding from the authorities, afield under the name of Eddy
Sloman.



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

On Tue, 15 Oct 2019 19:52:58 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-15 11:06, jlarkin@highlandsniptechnology.com wrote:
On Tue, 15 Oct 2019 01:20:02 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-14 23:11, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.


Where have you been? Eddie Current is famous for inventing the LVDT :
"Linear Voltage Displacement Transformer", according to the article.

https://www.electronicdesign.com/analog/11-myths-about-inductive-position-sensors

See Fig 1.

I remember when Electronic Design often made sense.

Most recently around 1995, iirc.

Cheers

Phil Hobbs
(Who BITD learned a fair amount from ED, EDN, and especially RF Design.)

Remember bingo cards? The mags and the cards kept us up to date.

Yup. Back when it actually cost something to send product info, they
targeted it a lot more carefully.

When I was a young teenager I had a subscription to the Motorola Update
program--four times a year I got a box full of all the databooks and
apps manuals they'd published that quarter. It was stuff like COS/MOS
MSI, bipolar memory, bit-slice ALUs, MC6800 peripherals, CATV
amplifiers, and so forth. Made my fourteen-year-old-self feel like a
real guy.

I won some science fairs and got 1-year subscriptions to BSTJ and the
HP Journal. A lot was happening about that time.

And a trip to Bell Labs in Murry Hill, me and my physics teacher.

*And* I won a week in the Navy!



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

Robert Baer <robertbaer@localnet.com> wrote in
news:unwpF.57464$O_.53958@fx39.iad:

bitrex wrote:
On 10/14/19 11:11 PM, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.

https://www.electronicdesign.com/analog/11-myths-about-inductive-
position-sensors


See Fig 1.

I remember when Electronic Design often made sense.



Eddie Currents possibly associated with the notorious Eddie
Coyle:

https://www.youtube.com/watch?v=vWdqoPHW-F8



Not playable.

You still on a 9600 baud modem, boy?

You tryin' to tell us that you have never played a video on the
youtube site? 'Cause that is where that one is, and they are all the
same format.

 

[Bill Sloman]

On Wednesday, October 16, 2019 at 2:46:16 PM UTC+11, jla...@highlandsniptechnology.com wrote:

On Tue, 15 Oct 2019 19:52:58 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-15 11:06, jlarkin@highlandsniptechnology.com wrote:
On Tue, 15 Oct 2019 01:20:02 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-14 23:11, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.


Where have you been? Eddie Current is famous for inventing the LVDT :
"Linear Voltage Displacement Transformer", according to the article.

https://www.electronicdesign.com/analog/11-myths-about-inductive-position-sensors

See Fig 1.

I remember when Electronic Design often made sense.

Most recently around 1995, iirc.

Cheers

Phil Hobbs
(Who BITD learned a fair amount from ED, EDN, and especially RF Design.)

Remember bingo cards? The mags and the cards kept us up to date.

Yup. Back when it actually cost something to send product info, they
targeted it a lot more carefully.

When I was a young teenager I had a subscription to the Motorola Update
program--four times a year I got a box full of all the databooks and
apps manuals they'd published that quarter. It was stuff like COS/MOS
MSI, bipolar memory, bit-slice ALUs, MC6800 peripherals, CATV
amplifiers, and so forth. Made my fourteen-year-old-self feel like a
real guy.

I won some science fairs and got 1-year subscriptions to BSTJ and the
HP Journal. A lot was happening about that time.

And a trip to Bell Labs in Murry Hill, me and my physics teacher.

*And* I won a week in the Navy!

Pity about the subsequent career. Bell Labs did have an aura at the time - Nobel Prizes do that - and John Larkin doesn't.

--
Bill Sloman, Sydney

 

[John S]

On 10/15/2019 6:52 PM, Phil Hobbs wrote:

On 2019-10-15 11:06, jlarkin@highlandsniptechnology.com wrote:
On Tue, 15 Oct 2019 01:20:02 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2019-10-14 23:11, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.


Where have you been?  Eddie Current is famous for inventing the LVDT :
"Linear Voltage Displacement Transformer", according to the article.

https://www.electronicdesign.com/analog/11-myths-about-inductive-position-sensors


See Fig 1.

I remember when Electronic Design often made sense.

Most recently around 1995, iirc.

Cheers

Phil Hobbs
(Who BITD learned a fair amount from ED, EDN, and especially RF Design.)

Remember bingo cards? The mags and the cards kept us up to date.

Yup.  Back when it actually cost something to send product info, they
targeted it a lot more carefully.

When I was a young teenager I had a subscription to the Motorola Update
program--four times a year I got a box full of all the databooks and
apps manuals they'd published that quarter.  It was stuff like COS/MOS
MSI, bipolar memory, bit-slice ALUs, MC6800 peripherals, CATV
amplifiers, and so forth.  Made my fourteen-year-old-self feel like a
real guy.

Given the importance of the electronics industry, the publications are
now disgraceful. They might hire some retired-actual-EEs to check
their stuff before they publish.

They might die of laughter (or maybe boredom).  Steve Woodward is long
gone.


The microwave and optics and aerospace mags are still good.

Microwaves and RF relies pretty heavily on advertisers for copy these days.

I am relieved to learn that inductive sensors don't measure
inductance.

I also really liked Circuit Cellar when Steve Ciarcia was running it.

Cheers

Phil Hobbs

Yes, I loved CC until Steve was gone and the price went way up. I didn't
renew.

 

[John Larkin]

On Tue, 15 Oct 2019 20:30:45 -0000 (UTC), Steve Wilson <no@spam.com>
wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:

GPS can determine compass direction if the car is in motion, if GPS
tracks its location, and you assume the car is pointed in the
direction that it is going.

I doubt anyone has actually done that.

I think that's how my Garmin works. When I start my car and move a few feet,
it knows exactly which direction to steer to get on track to my destination.

Very simple idea, actually.

What if you start in reverse?

 

[bitrex]

On 10/16/19 2:18 PM, bitrex wrote:

On 10/16/19 12:45 AM, DecadentLinuxUserNumeroUno@decadence.org wrote:
Robert Baer <robertbaer@localnet.com> wrote in
news:unwpF.57464$O_.53958@fx39.iad:

bitrex wrote:
On 10/14/19 11:11 PM, jlarkin@highlandsniptechnology.com wrote:
Sounds like a minor mobster.

https://www.electronicdesign.com/analog/11-myths-about-inductive-
position-sensors


See Fig 1.

I remember when Electronic Design often made sense.



Eddie Currents possibly associated with the notorious Eddie
Coyle:

https://www.youtube.com/watch?v=vWdqoPHW-F8



    Not playable.



   You still on a 9600 baud modem, boy?

   You tryin' to tell us that you have never played a video on the
youtube site?  'Cause that is where that one is, and they are all the
same format.


He needs the text version I guess:

https://en.wikipedia.org/wiki/The_Friends_of_Eddie_Coyle_(novel)

I do regret that my late father never got to see Whitey Bulger get his
in the joint it would have made his day. What a pogue-Irish piece of shit.

 

[Steve Wilson]

John Larkin <jlarkin@highland_atwork_technology.com> wrote:

On Tue, 15 Oct 2019 20:30:45 -0000 (UTC), Steve Wilson <no@spam.com
wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:

GPS can determine compass direction if the car is in motion, if GPS
tracks its location, and you assume the car is pointed in the
direction that it is going.

I doubt anyone has actually done that.

I think that's how my Garmin works. When I start my car and move a few
feet, it knows exactly which direction to steer to get on track to my
destination.

Very simple idea, actually.

What if you start in reverse?

You are not allowed to drive on roads in reverse.