[EE] flat wire vendor

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[EE] flat wire vendor

madscientistatlarge
Looking for a vendor that sells flat magnet wire, preferably in 1 LB quantities, preferably in north America.  Any one know of a good low volume source?


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Re: [EE] flat wire vendor

Bob Blick-5
Hi Mad,

Square wire might be the closest to flat that you'll find:

https://mwswire.com/magnet-wire/square-magnet-wire/

Cheers,
Bob

________________________________________
From: [hidden email] <[hidden email]> on behalf of madscientistatlarge
Sent: Wednesday, October 7, 2020 11:06 PM
To: [hidden email]
Subject: [EE]  flat wire vendor

Looking for a vendor that sells flat magnet wire, preferably in 1 LB quantities, preferably in north America.  Any one know of a good low volume source?



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Re: [EE] flat wire vendor

louijp@gmail.com
Bob, the website you provided has also rectangular wire which might be what
the OP requested.

Jean-Paul
N1JPL

Sent from my Communication Rock Slate

On Thu, Oct 8, 2020, 11:57 AM Bob Blick <[hidden email]> wrote:

> Hi Mad,
>
> Square wire might be the closest to flat that you'll find:
>
> https://mwswire.com/magnet-wire/square-magnet-wire/
>
> Cheers,
> Bob
>
> ________________________________________
> From: [hidden email] <[hidden email]> on behalf of
> madscientistatlarge
> Sent: Wednesday, October 7, 2020 11:06 PM
> To: [hidden email]
> Subject: [EE]  flat wire vendor
>
> Looking for a vendor that sells flat magnet wire, preferably in 1 LB
> quantities, preferably in north America.  Any one know of a good low volume
> source?
>
>
>
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> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
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Re: [EE] flat wire vendor

madscientistatlarge
I've been to their website, do you know if they'll do small quantitiy?  Couldn't tell from the website.  It's for switching power supply inductor.  I may just use multiple fine wires in parallel, not too much of a pain for small amounts and the core has plenty of room.  Thanks, this list is frequently amazing!


Sent with ProtonMail Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, October 8, 2020 10:29 AM, Jean-Paul Louis <[hidden email]> wrote:

> Bob, the website you provided has also rectangular wire which might be what
> the OP requested.
>
> Jean-Paul
> N1JPL
>
> Sent from my Communication Rock Slate
>
> On Thu, Oct 8, 2020, 11:57 AM Bob Blick [hidden email] wrote:
>
> > Hi Mad,
> > Square wire might be the closest to flat that you'll find:
> > https://mwswire.com/magnet-wire/square-magnet-wire/
> > Cheers,
> > Bob
> >
> > From: [hidden email] [hidden email] on behalf of
> > madscientistatlarge
> > Sent: Wednesday, October 7, 2020 11:06 PM
> > To: [hidden email]
> > Subject: [EE] flat wire vendor
> > Looking for a vendor that sells flat magnet wire, preferably in 1 LB
> > quantities, preferably in north America. Any one know of a good low volume
> > source?
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>
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Re: [EE] flat wire vendor

Bob Blick-5
Yes, and they take credit cards. But don't be shocked by the price - it's a specialty item you're purchasing.

Cheers, Bob

________________________________________
From: [hidden email] <[hidden email]> on behalf of madscientistatlarge
Sent: Thursday, October 8, 2020 1:06 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] flat wire vendor

I've been to their website, do you know if they'll do small quantitiy?  Couldn't tell from the website.  It's for switching power supply inductor.  I may just use multiple fine wires in parallel, not too much of a pain for small amounts and the core has plenty of room.  Thanks, this list is frequently amazing!


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Re: [EE] flat wire vendor

madscientistatlarge
I figured it would be expensive, always telling when there are no prices online.  Presumably they custom make it as needed.

Definitely going to be home made Litz wire for this project.  It's a good thing I saw that wiring chart with the frequency limits before the skin effect takes a strong hold, the 18 gauge wire I was going to use would be terrible at 500 Khz.  At least at 500Khz I won't need to make too much home made Litz wire for coil winding.


Sent with ProtonMail Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, October 8, 2020 4:40 PM, Bob Blick <[hidden email]> wrote:

> Yes, and they take credit cards. But don't be shocked by the price - it's a specialty item you're purchasing.
>
> Cheers, Bob
>
> From: [hidden email] [hidden email] on behalf of madscientistatlarge
>
> Sent: Thursday, October 8, 2020 1:06 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] flat wire vendor
>
> I've been to their website, do you know if they'll do small quantitiy? Couldn't tell from the website. It's for switching power supply inductor. I may just use multiple fine wires in parallel, not too much of a pain for small amounts and the core has plenty of room. Thanks, this list is frequently amazing!
>
>
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist



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Re: [EE] flat wire vendor

James Cameron-2
On Fri, Oct 09, 2020 at 05:07:25AM +0000, madscientistatlarge wrote:
> I figured it would be expensive, always telling when there are no
> prices online.  Presumably they custom make it as needed.

As someone who has a product with no prices online I'm happy to defend
the idea; a price has a period of validity based on cost of production
inputs, and warehousing, and the cost of maintaining a price is
non-zero.  So when the number of orders declines below a certain
point, prices must be hidden otherwise the cost of maintaining it
exceeds the margin made.

They may have a drum of a precursor product that needs another
process step before it becomes the SKU you want.  ;-)

--
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http://quozl.netrek.org/
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Re: [EE] flat wire vendor

Sean Breheny
In reply to this post by madscientistatlarge
Beware that magnetics for smps have to deal with not only skin effect but
also proximity effect and eddy current losses in the wire itself. I believe
that these effects tend to make Litz wire suboptimal for the application.
Making a high-Q but low-power RF inductor is not the same as a high-power
high-frequency transformer.

Have a look at the TI/Unitrode Seminars (free but seems now to require
registration):

https://www.ti.com/ww/en/power-training/login.shtml

Sean


On Fri, Oct 9, 2020 at 1:09 AM madscientistatlarge <
[hidden email]> wrote:

> I figured it would be expensive, always telling when there are no prices
> online.  Presumably they custom make it as needed.
>
> Definitely going to be home made Litz wire for this project.  It's a good
> thing I saw that wiring chart with the frequency limits before the skin
> effect takes a strong hold, the 18 gauge wire I was going to use would be
> terrible at 500 Khz.  At least at 500Khz I won't need to make too much home
> made Litz wire for coil winding.
>
>
> Sent with ProtonMail Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Thursday, October 8, 2020 4:40 PM, Bob Blick <[hidden email]>
> wrote:
>
> > Yes, and they take credit cards. But don't be shocked by the price -
> it's a specialty item you're purchasing.
> >
> > Cheers, Bob
> >
> > From: [hidden email] [hidden email] on behalf of
> madscientistatlarge
> >
> > Sent: Thursday, October 8, 2020 1:06 PM
> > To: Microcontroller discussion list - Public.
> > Subject: Re: [EE] flat wire vendor
> >
> > I've been to their website, do you know if they'll do small quantitiy?
> Couldn't tell from the website. It's for switching power supply inductor. I
> may just use multiple fine wires in parallel, not too much of a pain for
> small amounts and the core has plenty of room. Thanks, this list is
> frequently amazing!
> >
> >
> >
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> >
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>
>
>
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
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Re: [EE] flat wire vendor

madscientistatlarge
I'll check that out, been registered with them for a long, long time.  Thanks for the link.


Sent with ProtonMail Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, October 9, 2020 7:46 AM, Sean Breheny <[hidden email]> wrote:

> Beware that magnetics for smps have to deal with not only skin effect but
> also proximity effect and eddy current losses in the wire itself. I believe
> that these effects tend to make Litz wire suboptimal for the application.
> Making a high-Q but low-power RF inductor is not the same as a high-power
> high-frequency transformer.
>
> Have a look at the TI/Unitrode Seminars (free but seems now to require
> registration):
>
> https://www.ti.com/ww/en/power-training/login.shtml
>
> Sean
>
> On Fri, Oct 9, 2020 at 1:09 AM madscientistatlarge <
> [hidden email]> wrote:
>
> > I figured it would be expensive, always telling when there are no prices
> > online. Presumably they custom make it as needed.
> > Definitely going to be home made Litz wire for this project. It's a good
> > thing I saw that wiring chart with the frequency limits before the skin
> > effect takes a strong hold, the 18 gauge wire I was going to use would be
> > terrible at 500 Khz. At least at 500Khz I won't need to make too much home
> > made Litz wire for coil winding.
> > Sent with ProtonMail Secure Email.
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Thursday, October 8, 2020 4:40 PM, Bob Blick [hidden email]
> > wrote:
> >
> > > Yes, and they take credit cards. But don't be shocked by the price -
> > > it's a specialty item you're purchasing.
> > > Cheers, Bob
> > > From: [hidden email] [hidden email] on behalf of
> > > madscientistatlarge
> > > Sent: Thursday, October 8, 2020 1:06 PM
> > > To: Microcontroller discussion list - Public.
> > > Subject: Re: [EE] flat wire vendor
> > > I've been to their website, do you know if they'll do small quantitiy?
> > > Couldn't tell from the website. It's for switching power supply inductor. I
> > > may just use multiple fine wires in parallel, not too much of a pain for
> > > small amounts and the core has plenty of room. Thanks, this list is
> > > frequently amazing!
> >
> > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>
> --
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Re: [EE] flat wire vendor

Brooke Clarke
In reply to this post by madscientistatlarge
Hi MS@L:

I have purchased 1 lb spools of Litz from:
http://www.coonerwire.com/flexible-wire/
I also buy Silicon insulated wire with a Litz type core, not for the Skin Effect improvement, but for test lead
applications where you want flexibility.

--
Have Fun,

Brooke Clarke
https://www.PRC68.com - Down for another week or so
http://www.end2partygovernment.com/2012Issues.html - down for > a week
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> flat wire vendor

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Re: [EE] flat wire vendor

Sean Breheny
In reply to this post by madscientistatlarge
After writing that email I did some more digging and it does seem like some
high power inductors do use Litz wire (one example I saw was the coil for
an induction-heated cooktop). So, I may be wrong - still the TI stuff is
worth looking at. I've learned a lot from it when it comes to transformers
and coils for SMPS.

Sean


On Fri, Oct 9, 2020 at 10:10 AM madscientistatlarge <
[hidden email]> wrote:

> I'll check that out, been registered with them for a long, long time.
> Thanks for the link.
>
>
> Sent with ProtonMail Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Friday, October 9, 2020 7:46 AM, Sean Breheny <[hidden email]> wrote:
>
> > Beware that magnetics for smps have to deal with not only skin effect but
> > also proximity effect and eddy current losses in the wire itself. I
> believe
> > that these effects tend to make Litz wire suboptimal for the application.
> > Making a high-Q but low-power RF inductor is not the same as a high-power
> > high-frequency transformer.
> >
> > Have a look at the TI/Unitrode Seminars (free but seems now to require
> > registration):
> >
> > https://www.ti.com/ww/en/power-training/login.shtml
> >
> > Sean
> >
> > On Fri, Oct 9, 2020 at 1:09 AM madscientistatlarge <
> > [hidden email]> wrote:
> >
> > > I figured it would be expensive, always telling when there are no
> prices
> > > online. Presumably they custom make it as needed.
> > > Definitely going to be home made Litz wire for this project. It's a
> good
> > > thing I saw that wiring chart with the frequency limits before the skin
> > > effect takes a strong hold, the 18 gauge wire I was going to use would
> be
> > > terrible at 500 Khz. At least at 500Khz I won't need to make too much
> home
> > > made Litz wire for coil winding.
> > > Sent with ProtonMail Secure Email.
> > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > > On Thursday, October 8, 2020 4:40 PM, Bob Blick [hidden email]
> > > wrote:
> > >
> > > > Yes, and they take credit cards. But don't be shocked by the price -
> > > > it's a specialty item you're purchasing.
> > > > Cheers, Bob
> > > > From: [hidden email] [hidden email] on behalf of
> > > > madscientistatlarge
> > > > Sent: Thursday, October 8, 2020 1:06 PM
> > > > To: Microcontroller discussion list - Public.
> > > > Subject: Re: [EE] flat wire vendor
> > > > I've been to their website, do you know if they'll do small
> quantitiy?
> > > > Couldn't tell from the website. It's for switching power supply
> inductor. I
> > > > may just use multiple fine wires in parallel, not too much of a pain
> for
> > > > small amounts and the core has plenty of room. Thanks, this list is
> > > > frequently amazing!
> > >
> > > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > > View/change your membership options at
> > > > http://mailman.mit.edu/mailman/listinfo/piclist
> > >
> > > --
> > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
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> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>
>
>
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Re: [EE] flat wire vendor

madscientistatlarge
In the late 70's I read all the ti books I could (purchased from radio shack), before I was even In high school.  It was worth while.  I learned about bypassing and how things like mass flow meters work, which was handy when I used them in my job later.  I've always loved sensors and transducers.

There is an article about transformers in the article section you linked to, apparently it helps to use the right number of wires, being sub optimal with too few or too many wires.  As I have the time I'll be checking out more of their advice.  I've had economic upsets and won't be building till at least December though I may start limited design evaluation before then.  And I should have said this will be a coupled inductor/transformer for a SEPIC switching supply which makes a lot of things easier.

At least I'm slowly recovering from Covid's aftermath from back in April. It did major, major damage which is being very slow to heal.  I'm just starting to get my sense of smell back and it's still confused and vague, things that shouldn't smell alike do.  More importantly my heart is recovering and I wasn't even that sick with it. Fortunately I've always healed quickly, great immune system (though that also means some very bad allergies).  All strengths can be weaknesses and all weaknesses can be strengths depending on conditions.


Sent with ProtonMail Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, October 9, 2020 8:54 PM, Sean Breheny <[hidden email]> wrote:

> After writing that email I did some more digging and it does seem like some
> high power inductors do use Litz wire (one example I saw was the coil for
> an induction-heated cooktop). So, I may be wrong - still the TI stuff is
> worth looking at. I've learned a lot from it when it comes to transformers
> and coils for SMPS.
>
> Sean
>
> On Fri, Oct 9, 2020 at 10:10 AM madscientistatlarge <
> [hidden email]> wrote:
>
> > I'll check that out, been registered with them for a long, long time.
> > Thanks for the link.
> > Sent with ProtonMail Secure Email.
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Friday, October 9, 2020 7:46 AM, Sean Breheny [hidden email] wrote:
> >
> > > Beware that magnetics for smps have to deal with not only skin effect but
> > > also proximity effect and eddy current losses in the wire itself. I
> > > believe
> > > that these effects tend to make Litz wire suboptimal for the application.
> > > Making a high-Q but low-power RF inductor is not the same as a high-power
> > > high-frequency transformer.
> > > Have a look at the TI/Unitrode Seminars (free but seems now to require
> > > registration):
> > > https://www.ti.com/ww/en/power-training/login.shtml
> > > Sean
> > > On Fri, Oct 9, 2020 at 1:09 AM madscientistatlarge <
> > > [hidden email]> wrote:
> > >
> > > > I figured it would be expensive, always telling when there are no
> > > > prices
> > >
> > > > online. Presumably they custom make it as needed.
> > > > Definitely going to be home made Litz wire for this project. It's a
> > > > good
> > >
> > > > thing I saw that wiring chart with the frequency limits before the skin
> > > > effect takes a strong hold, the 18 gauge wire I was going to use would
> > > > be
> > >
> > > > terrible at 500 Khz. At least at 500Khz I won't need to make too much
> > > > home
> > >
> > > > made Litz wire for coil winding.
> > > > Sent with ProtonMail Secure Email.
> > > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > > > On Thursday, October 8, 2020 4:40 PM, Bob Blick [hidden email]
> > > > wrote:
> > > >
> > > > > Yes, and they take credit cards. But don't be shocked by the price -
> > > > > it's a specialty item you're purchasing.
> > > > > Cheers, Bob
> > > > > From: [hidden email] [hidden email] on behalf of
> > > > > madscientistatlarge
> > > > > Sent: Thursday, October 8, 2020 1:06 PM
> > > > > To: Microcontroller discussion list - Public.
> > > > > Subject: Re: [EE] flat wire vendor
> > > > > I've been to their website, do you know if they'll do small
> > > > > quantitiy?
> > >
> > > > > Couldn't tell from the website. It's for switching power supply
> > > > > inductor. I
> > >
> > > > > may just use multiple fine wires in parallel, not too much of a pain
> > > > > for
> > >
> > > > > small amounts and the core has plenty of room. Thanks, this list is
> > > > > frequently amazing!
> > > >
> > > > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > > > View/change your membership options at
> > > > > http://mailman.mit.edu/mailman/listinfo/piclist
> > > >
> > > > --
> > > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > > View/change your membership options at
> > > > http://mailman.mit.edu/mailman/listinfo/piclist
> > >
> > > --
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> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
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Re: [EE] flat wire vendor

Jesse Lackey
In reply to this post by madscientistatlarge
This may be a nonsensical suggestion, but coils for Qi wireless power
use Litz wire.  Such as digikey 732-5673-ND, WM15006-ND, 445-175309-ND,
445-174582-ND.

If you are in the USA and going this re-purpose route seems useful, let
me know (jesse at celestialaudio dotcom) and I can USPS a handful of
random ones.  I'm about to finally finish a Qi design project and there
are a bunch of coils from the R&D phase we won't ever be using.

Have fun!
J


madscientistatlarge wrote:

> I figured it would be expensive, always telling when there are no prices online.  Presumably they custom make it as needed.
>
> Definitely going to be home made Litz wire for this project.  It's a good thing I saw that wiring chart with the frequency limits before the skin effect takes a strong hold, the 18 gauge wire I was going to use would be terrible at 500 Khz.  At least at 500Khz I won't need to make too much home made Litz wire for coil winding.
>
>
> Sent with ProtonMail Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Thursday, October 8, 2020 4:40 PM, Bob Blick <[hidden email]> wrote:
>
>> Yes, and they take credit cards. But don't be shocked by the price - it's a specialty item you're purchasing.
>>
>> Cheers, Bob
>>
>> From: [hidden email] [hidden email] on behalf of madscientistatlarge
>>
>> Sent: Thursday, October 8, 2020 1:06 PM
>> To: Microcontroller discussion list - Public.
>> Subject: Re: [EE] flat wire vendor
>>
>> I've been to their website, do you know if they'll do small quantitiy? Couldn't tell from the website. It's for switching power supply inductor. I may just use multiple fine wires in parallel, not too much of a pain for small amounts and the core has plenty of room. Thanks, this list is frequently amazing!
>>
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Re: [EE] flat wire vendor

RussellMc
On Mon, 12 Oct 2020 at 16:03, Jesse Lackey <[hidden email]>
wrote:

> ...  I'm about to finally finish a Qi design project ...


Jesse - interest only :

I rode on an inductive power transferred "trolley" in a university hall in
1973 - 400 Hz !!! - Prof Don Otto (long dead).
He had numerous IPT patents which tend not to be cited by subsequent
:"discoverers" in the area from the same institution in later years.

In about 2000 I produced a prototype inductive power system - target was
power transmission to a warehouse picking system with many powered "bins" .
I used a 100 meter loop for the demo - this included highish speed
bidirectional signalling across the power loop.
There was one now long expired US patent with mu name on it.

A friend did earlier IPT development in association in his own company and
also in conjunction with Auckland University - who they sold their patent
rights to at one stage.

Lots of fun :-).
Long before Qi.


         Russell




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Re: [EE] flat wire vendor

RussellMc
In reply to this post by Sean Breheny
On Sat, 10 Oct 2020 at 15:56, Sean Breheny <[hidden email]> wrote:

> After writing that email I did some more digging and it does seem like some
> high power inductors do use Litz wire (one example I saw was the coil for
> an induction-heated cooktop).
>

I have several induction cooktops in my dungeon. I'll have a look at the
wire they use. Brain says it was indeed Litz. Gauge and strands unknown.


         Russell
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Re: [EE] flat wire vendor

Jesse Lackey
In reply to this post by RussellMc
Neato!!  100 meter loop, good grief!
We really needed you onsite the past 8 weeks, there were many problems,
mostly not our (TX) side of things.

And then there is this - a tesla powered roadster :)  (start at 1:45)
<https://www.youtube.com/watch?v=NfKOD0XqR14&feature=emb_logo>

J

RussellMc wrote:

> On Mon, 12 Oct 2020 at 16:03, Jesse Lackey <[hidden email]>
> wrote:
>
>> ...  I'm about to finally finish a Qi design project ...
>
>
> Jesse - interest only :
>
> I rode on an inductive power transferred "trolley" in a university hall in
> 1973 - 400 Hz !!! - Prof Don Otto (long dead).
> He had numerous IPT patents which tend not to be cited by subsequent
> :"discoverers" in the area from the same institution in later years.
>
> In about 2000 I produced a prototype inductive power system - target was
> power transmission to a warehouse picking system with many powered "bins" .
> I used a 100 meter loop for the demo - this included highish speed
> bidirectional signalling across the power loop.
> There was one now long expired US patent with mu name on it.
>
> A friend did earlier IPT development in association in his own company and
> also in conjunction with Auckland University - who they sold their patent
> rights to at one stage.
>
> Lots of fun :-).
> Long before Qi.
>
>
>           Russell
>
>
>
>
>>
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Re: [EE] flat wire vendor

RussellMc
On Thu, 15 Oct 2020 at 13:34, Jesse Lackey <[hidden email]>
wrote:

> Neato!!  100 meter loop, good grief!
> We really needed you onsite the past 8 weeks, there were many problems,
> mostly not our (TX) side of things.
>

May work (for a while) for food, airfare (cattle class) and somewhere under
a desk to sleep :-)
(Has to be an interesting task and somewhere where interesting roaming
about photos can be taken (that's everywhere I've been, so far)).

THe high speed signalling was probably more of a challenge than the power
transfer.
Not being required to work to anyone else's "standards" (eg Qi) helped.
Such things did not exist 'back then'.



       Russell
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