Help winding my own inductor?

[bushbadee]

MagInc use to sample me all the time.
They are pretty good about that.
But of course the stuff I hand wound often wound up in production.

"John > > Use maybe 78 material from this catalog? It is recommended for
applications

200 KHz, but it says it's for power supply applications (meaning 50 -
60
Hz?).

They mean switching power supplies. Just what it sounds like you are
doing.

Other materials seem appropriate, also, but don't come in pot cores.

What is a good mail-order supplier for such cores and bobbins?

I wish I knew. If you can't find any supplier, I may be able to
scrounge 1 or two core sets and bobbins from my personal stash to get
you started. This is the easiest component to make yourself that can
compete with a commercial product in quality, but it is very hard to
find the parts in low quantity. And that is a real shame.

--
John Popelish

 

[John Woodgate]

I read in sci.electronics.design that bushbadee <bushbadee@verizon.net>
wrote (in <Dh1Fb.5307$ci1.2095@nwrddc03.gnilink.net&gt about 'Help
winding my own inductor?', on Sat, 20 Dec 2003:

Not impossible
What you need is a shuttle.
If the hole is real small you can use a needle as a shuttle.
If it is larger then you can take a wire coat hanger and cut a section off
and with a riffle file, file notches in a section of it and wrap your wire
around the notches in the wire (Or a metal or wood rod) that will keep your
wire neat and nice while you pass it around the core.
I have wound many of them

The 1.6 mm wire work-hardens after a few turns and then it would be
easier to wind the coat hanger round the core.

If I send you the core and wire, will you wind it for me?
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!

 

[bushbadee]

What gauge is that.?
I do not have the time to look it up.
I have, as I said, wound many.
Why would you use a work hardened wire.?
Using a shuttle keeps the wire from getting work hardened and works quite
well with copper wire.
I have wound hundreds of turns on transformers with this method.
Sure I will wind it for you, if you will pay my price.
For less than 8 hours work, it is $200 bucks an hour.
Travel time is included in that 8 hours and there is an additional charge of
50 cents per mile.
Yes people do pay me that .

In fact for that much I will even design your circuit.
If there is a patent involved, I get credit for the patent and one third
ownership.

"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> wrote in message
news:XZKAQJEYTK5$EwP7@jmwa.demon.co.uk...

I read in sci.electronics.design that bushbadee <bushbadee@verizon.net
wrote (in <Dh1Fb.5307$ci1.2095@nwrddc03.gnilink.net&gt about 'Help
winding my own inductor?', on Sat, 20 Dec 2003:
Not impossible
What you need is a shuttle.
If the hole is real small you can use a needle as a shuttle.
If it is larger then you can take a wire coat hanger and cut a section
off
and with a riffle file, file notches in a section of it and wrap your
wire
around the notches in the wire (Or a metal or wood rod) that will keep
your
wire neat and nice while you pass it around the core.
I have wound many of them

The 1.6 mm wire work-hardens after a few turns and then it would be
easier to wind the coat hanger round the core.

If I send you the core and wire, will you wind it for me?
--
Regards, John Woodgate, OOO - Own Opinions Only.
http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go
to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!

 

[DarkMatter]

On Sat, 20 Dec 2003 19:55:54 GMT, "bushbadee" <bushbadee@verizon.net>
Gave us:

Sure I will wind it for you, if you will pay my price.
For less than 8 hours work, it is $200 bucks an hour.
Travel time is included in that 8 hours and there is an additional charge of
50 cents per mile.
Yes people do pay me that .

For winding a choke? Sorry. You ain't worth that much on your best
day.

 

John Woodgate wrote:

I read in sci.electronics.design that Tim Wescott
tim@wescottnospamdesign.com> wrote (in <vu6afgks01kb31@corp.supernews.c
om&gt about 'Help winding my own inductor?', on Fri, 19 Dec 2003:

Oh, when you're halfway through winding a large toroid you start
thinking of them in those terms.

Yes. I bought a demister antenna kit from Maplin that required a small
ferrite toroid to be wound with 1.6 mm wire. In two words - im possible.
--

You left out the word between im and possible - probably
out of consideration for our tender psyches.

Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!

 

[John Woodgate]

I read in sci.electronics.design that bushbadee <bushbadee@verizon.net>
wrote (in <eP1Fb.5341$ci1.1490@nwrddc03.gnilink.net&gt about 'Help
winding my own inductor?', on Sat, 20 Dec 2003:

What gauge is that.?
I do not have the time to look it up.

Neither do I. Unless you pay $200 an hour.(;-)

OK. 1.6 mm is 1/16 inch nearly, so that's about AWG14.

I have, as I said, wound many.
Why would you use a work hardened wire.?

I'd much prefer not to

Using a shuttle keeps the wire from getting work hardened

I don't suppose you'd explain how it performs that metallurgical
miracle? You can't thread the wire through the centre hole and tighten
it to the core without bending it, and bending it makes it work harden.

and works quite
well with copper wire.

I expect it does, for thin enough wire.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!

 

[DarkMatter]

On Thu, 18 Dec 2003 22:46:28 -0800, DaveC <me@privacy.net> Gave us:

I have a 20 mH inductor (off the shelf) but is getting hot with the current
I'm passing through it.

Where do I start? References and advice welcome.

You need a high perm core. Large wire size makes for low I squared
R as well.

Arnold makes some really good cores for this. Also use several
smaller gauge wires in a litz configuration for even better I
performance at your frequency.

Use a toroid. much easier than a pot core, and better as well.
Easy to wind with Litz as well.

26Ga mag wire can do 1 amp, but I'd go a little bigger.
Seven 32Ga mg wires makes a real good litz that can do over an amp
easy.

Seven 30Ga wires makes for about just over single 24Ga, but performs
much better.

Twist them together to form a single conductor.

Count only the turns *inside* the core center.

 

[DarkMatter]

On Fri, 19 Dec 2003 13:33:54 -0000, "Genome" <genome@nothere.com> Gave
us:

L is the value of your inductor in Humphreys

Humphreys? Right.

 

[DarkMatter]

On Sat, 20 Dec 2003 12:05:00 -0000, "Genome" <genome@nothere.com> Gave
us:

I seriously hate bastards who *define* their *meaning* with arseholelicks.
That would be Asterixs.

I *seriously* hate retards that get all riled up over petty, E-1
grade baby bullshit.

 

[DarkMatter]

On Sat, 20 Dec 2003 19:55:54 GMT, "bushbadee" <bushbadee@verizon.net>
Gave us:

Why would you use a work hardened wire.?

Dumbshit. YOU claim to have been winding copper for years.

Copper wire "work hardens". ALL copper wire. For you to not know
that is a heck of a tell... Again.

When copper is flexed, it hardens where the flexure takes place.
Again, you should know all about this. The flexure has to be very
*VERY* slow for this not to happen. Rare.

Be sure to go grab another coffee.

 

[John Fields]

On Sat, 20 Dec 2003 12:19:17 -0800, DarkMatter
<DarkMatter@thebarattheendoftheuniverse.org> wrote:

Use a toroid. much easier than a pot core, and better as well.
Easy to wind with Litz as well.

---
winding a bobbin and slipping it over the center leg of one of the
halves of a pot core is harder than winding a toroid? Imagine that!!!

Gapping a pot core is harder than gapping a toroid? Imagine that!!!

--
John Fields

 

[John Woodgate]

I read in sci.electronics.design that ehsjr@bellatlantic.net wrote (in
<3FE4ACD9.198AD3AD@bellatlantic.net&gt about 'Help winding my own
inductor?', on Sat, 20 Dec 2003:

John Woodgate wrote:

I read in sci.electronics.design that Tim Wescott
tim@wescottnospamdesign.com> wrote (in <vu6afgks01kb31@corp.supernews.c
om&gt about 'Help winding my own inductor?', on Fri, 19 Dec 2003:

Oh, when you're halfway through winding a large toroid you start
thinking of them in those terms.

Yes. I bought a demister antenna kit from Maplin that required a small
ferrite toroid to be wound with 1.6 mm wire. In two words - im possible.
--

You left out the word between im and possible - probably
out of consideration for our tender psyches.

Well, I was quoting Sam Goldwyn, I think. But to quote Tommy Atkins, it
becomes one word again 'imfu***ngpossible'. This is an example of
'mtesis', and that is the only English word that starts with 'mt'.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!

 

[John Woodgate]

I read in sci.electronics.design that DarkMatter <DarkMatter@thebaratthe
endoftheuniverse.org> wrote (in <j2b9uv0hn5biob2bdab76fn9j6l21ou38n@4ax.
com&gt about 'Help winding my own inductor?', on Sat, 20 Dec 2003:

Twist them together to form a single conductor.

You can't make genuine Litz wire simply by twisting the strands
together. The interweaving pattern is a lot more complex.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!

 

[Genome]

"DaveC" <me@privacy.net> wrote in message
news:0001HW.BC09AD91000EDD1CF0080600@news.individual.net...

Thanks (I think...)
--
DaveC
me@privacy.net

You are wondeful, even if I can't spell it.

DNA

 

[DarkMatter]

On Sat, 20 Dec 2003 14:56:35 -0600, John Fields
<jfields@austininstruments.com> Gave us:

Gapping a pot core is harder than gapping a toroid? Imagine that!!!

One doesn't gap these types of toroid.

 

[DarkMatter]

On Sat, 20 Dec 2003 14:56:35 -0600, John Fields
<jfields@austininstruments.com> Gave us:

winding a bobbin and slipping it over the center leg of one of the
halves of a pot core is harder than winding a toroid? Imagine that!!!

Without a winding mandrel, holding a loose bobbin in one's hand
while winding it is no easier than winding a hand held toroid would
be.

Imagine that.

 

[DarkMatter]

On Sat, 20 Dec 2003 21:42:54 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> Gave us:

You can't make genuine Litz wire simply by twisting the strands
together. The interweaving pattern is a lot more complex.

You're nuts. Go to any wire maker's site. Litz wire is several
strands of finer pitch mag wire, all coated, that are either in
twisted, OR non-twisted configurations. You can run ANY number of
parallel strands in a choke, and gain a litz advantage at even this
low (25kHz) frequency.

It is not woven. That leans toward Litz Ribbon, however. An
interesting idea.

You must be thinking of the type of build the winding process on
some HF coils has.

 

[Genome]

"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in message
news:q5r9uvc6vooi6pa46pmespvh8m65jqg7jv@4ax.com...

On Sat, 20 Dec 2003 14:56:35 -0600, John Fields
jfields@austininstruments.com> Gave us:


winding a bobbin and slipping it over the center leg of one of the
halves of a pot core is harder than winding a toroid? Imagine that!!!

Without a winding mandrel, holding a loose bobbin in one's hand
while winding it is no easier than winding a hand held toroid would
be.

Imagine that.

Awefully sorry folks, I have just noticed that my cock is not being
fellated. Normal service will be resumed as soon as is possible.

DNA

 

[Spehro Pefhany]

On Sun, 21 Dec 2003 01:50:24 GMT, the renowned jfields@texas.net (John
Fields) wrote:

On Sat, 20 Dec 2003 16:43:20 -0800, DarkMatter
DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sat, 20 Dec 2003 14:56:35 -0600, John Fields
jfields@austininstruments.com> Gave us:

Gapping a pot core is harder than gapping a toroid? Imagine that!!!

One doesn't gap these types of toroid.

---
Well, then, which types of toroids _does_ one gap?

http://www.mtroyal.ab.ca/eatingoncampus/images/timhortons.jpg

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

 

[John Fields]

On Sat, 20 Dec 2003 16:43:20 -0800, DarkMatter
<DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sat, 20 Dec 2003 14:56:35 -0600, John Fields
jfields@austininstruments.com> Gave us:

Gapping a pot core is harder than gapping a toroid? Imagine that!!!

One doesn't gap these types of toroid.

---
Well, then, which types of toroids _does_ one gap?