Designing The Perfect Coil?

[Ron Hubbard]

I want to do an experiment in brainwave entrainment by making a 7 Hz
sine wave oscillator out of an XR2206 frequency generator IC and a
LM386 amplifier feeding a six inch diameter coil-- which should
probably fit around my fat head. ;-)

The LM386 has an 8 ohm output, so it shouldn't be hard to find a
speaker, if I wanted to use one; but I don't know how to make a good 8
ohm coil to radiate a nice clean undistorted signal-- how many turns,
what size wire to use, etc. Does anyone have any suggestions?

Ron


_____________

"There are special people in this world. We don't ask to be special.
We're just born this way. We pass you on the streets every day,
unnoticed by most. "

-- Cassie Holmes (Push) --

 

[George Herold]

On Mar 30, 12:14 am, Ron Hubbard <or...@dslnorthwest.net> wrote:

I want to do an experiment in brainwave entrainment by making a 7 Hz
sine wave oscillator out of an XR2206 frequency generator IC and a
LM386 amplifier feeding a six inch diameter  coil-- which should
probably fit around my fat head.  ;-)

The LM386 has an 8 ohm output, so it shouldn't be hard to find a
speaker, if I wanted to use one; but I don't know how to make a good 8
ohm coil to radiate a nice clean undistorted signal-- how many turns,
what size wire to use, etc. Does anyone have any suggestions?

Ron

_____________

"There are special people in this world. We don't ask to be special.
We're just born this way. We pass you on the streets every day,
unnoticed by most. "

--  Cassie Holmes (Push) --

Nothing is 'perfect' Ron. But making a coil about right is pretty
easy. I start with the coil resistance. You want ~8 ohms so you have
that number. You then have to know the size of the B field you want.
This (with the current.) gives you the number of turns you need. Then
I usually just take a guess at some wire size.. so many turns at some
radius to get the total length. Is the resistance of that length of
wire the desired 8 ohms? Adjust till it is.

George H.

 

[Ron Hubbard]

On Mar 30, 5:24 am, George Herold <gher...@teachspin.com> wrote:

On Mar 30, 12:14 am, Ron Hubbard <or...@dslnorthwest.net> wrote:





I want to do an experiment in brainwave entrainment by making a 7 Hz
sine wave oscillator out of an XR2206 frequency generator IC and a
LM386 amplifier feeding a six inch diameter  coil-- which should
probably fit around my fat head.  ;-)

The LM386 has an 8 ohm output, so it shouldn't be hard to find a
speaker, if I wanted to use one; but I don't know how to make a good 8
ohm coil to radiate a nice clean undistorted signal-- how many turns,
what size wire to use, etc. Does anyone have any suggestions?

Ron

_____________

"There are special people in this world. We don't ask to be special.
We're just born this way. We pass you on the streets every day,
unnoticed by most. "

--  Cassie Holmes (Push) --

Nothing is 'perfect' Ron.  But making a coil about right is pretty
easy.  I start with the coil resistance.  You want ~8 ohms so you have
that number.  You then have to know the size of the B field you want.
This (with the current.) gives you the number of turns you need.  Then
I usually just take a guess at some wire size.. so many turns at some
radius to get the total length.  Is the resistance of that length of
wire the desired 8 ohms?  Adjust till it is.

George H.- Hide quoted text -

- Show quoted text -

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

Ron


______________

“Hope for the best, but plan for the worst. “

— Richard Tyler (The 4400) ––

 

[Bob Myers]

On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are you wishing to create?

Bob M.

 

[Ron Hubbard]

On Mar 31, 6:25 pm, Bob Myers <bobmyer...@gmail.com> wrote:

On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are you wishing to create?

Bob M.

I had to take a look at this article again--

http://www.elfis.net/elfol8/e8elfeeg2.htm

-- as I am the kind of guy who would rather build something first and
worry about the mathematics behind it later (if at all). Trial and
error is fun, but sloppy engineering I'm afraid.

But it seems like a radiated field of 100 nanoteslas should do the job
well, assuming my little project will work at all.

Ron

 

[Bob Myers]

On Sunday, April 1, 2012 2:42:43 PM UTC-6, Ron Hubbard wrote:

On Mar 31, 6:25 pm, Bob Myers <bobmyer...@gmail.com> wrote:
On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are you wishing to create?

Bob M.



I had to take a look at this article again--

http://www.elfis.net/elfol8/e8elfeeg2.htm

-- as I am the kind of guy who would rather build something first and
worry about the mathematics behind it later (if at all). Trial and
error is fun, but sloppy engineering I'm afraid.

But it seems like a radiated field of 100 nanoteslas should do the job
well, assuming my little project will work at all.

Ron

So if you know the strength of the field you're trying to produce, and presumably this is the field within a loop of wire that is placed around the head, the next place you need to go is:


http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html#c2

Bob M.

 

[George Herold]

On Mar 31, 7:26 pm, Ron Hubbard <or...@dslnorthwest.net> wrote:

On Mar 30, 5:24 am, George Herold <gher...@teachspin.com> wrote:





On Mar 30, 12:14 am, Ron Hubbard <or...@dslnorthwest.net> wrote:

I want to do an experiment in brainwave entrainment by making a 7 Hz
sine wave oscillator out of an XR2206 frequency generator IC and a
LM386 amplifier feeding a six inch diameter  coil-- which should
probably fit around my fat head.  ;-)

The LM386 has an 8 ohm output, so it shouldn't be hard to find a
speaker, if I wanted to use one; but I don't know how to make a good 8
ohm coil to radiate a nice clean undistorted signal-- how many turns,
what size wire to use, etc. Does anyone have any suggestions?

Ron

_____________

"There are special people in this world. We don't ask to be special.
We're just born this way. We pass you on the streets every day,
unnoticed by most. "

--  Cassie Holmes (Push) --

Nothing is 'perfect' Ron.  But making a coil about right is pretty
easy.  I start with the coil resistance.  You want ~8 ohms so you have
that number.  You then have to know the size of the B field you want.
This (with the current.) gives you the number of turns you need.  Then
I usually just take a guess at some wire size.. so many turns at some
radius to get the total length.  Is the resistance of that length of
wire the desired 8 ohms?  Adjust till it is.

George H.- Hide quoted text -

- Show quoted text -

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

Ron

______________

“Hope for the best, but plan for the worst. “

 — Richard Tyler (The 4400)  ––- Hide quoted text -

- Show quoted text -

Well, the current just comes from Ohm's law. If you know the
resistance you want, then you've got some amp, with a power supply.
That supply sets your maximum current.

George H.

 

[Phil Hobbs]

On 04/01/2012 04:42 PM, Ron Hubbard wrote:

On Mar 31, 6:25 pm, Bob Myers<bobmyer...@gmail.com> wrote:
On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are you wishing to create?

Bob M.



I had to take a look at this article again--

http://www.elfis.net/elfol8/e8elfeeg2.htm

-- as I am the kind of guy who would rather build something first and
worry about the mathematics behind it later (if at all). Trial and
error is fun, but sloppy engineering I'm afraid.

But it seems like a radiated field of 100 nanoteslas should do the job
well, assuming my little project will work at all.

Ron

Sounds like just the sort of project for someone with a 6-inch diameter
head. Maybe make it cone-shaped.

Cheers

Phil

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

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

 

[John G]

Phil Hobbs explained :

On 04/01/2012 04:42 PM, Ron Hubbard wrote:
On Mar 31, 6:25 pm, Bob Myers<bobmyer...@gmail.com> wrote:
On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are you
wishing to create?

Bob M.



I had to take a look at this article again--

http://www.elfis.net/elfol8/e8elfeeg2.htm

-- as I am the kind of guy who would rather build something first and
worry about the mathematics behind it later (if at all). Trial and
error is fun, but sloppy engineering I'm afraid.

But it seems like a radiated field of 100 nanoteslas should do the job
well, assuming my little project will work at all.

Ron




Sounds like just the sort of project for someone with a 6-inch diameter head.
Maybe make it cone-shaped.

Cheers

Phil

Is the OP Ron Hubbard related to L Ron Hubbard? :-?

--
John G

 

[amdx]

On 4/2/2012 3:54 PM, Phil Hobbs wrote:

On 04/01/2012 04:42 PM, Ron Hubbard wrote:
On Mar 31, 6:25 pm, Bob Myers<bobmyer...@gmail.com> wrote:
On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are
you wishing to create?

Bob M.



I had to take a look at this article again--

http://www.elfis.net/elfol8/e8elfeeg2.htm

-- as I am the kind of guy who would rather build something first and
worry about the mathematics behind it later (if at all). Trial and
error is fun, but sloppy engineering I'm afraid.

But it seems like a radiated field of 100 nanoteslas should do the job
well, assuming my little project will work at all.

Ron




Sounds like just the sort of project for someone with a 6-inch diameter
head. Maybe make it cone-shaped.

Cheers

Phil

I was going to suggest he ask for advice when he starts trying to get
the 6 in coil of his head.
Mikek

 

[Chiron]

On Thu, 29 Mar 2012 21:14:53 -0700, Ron Hubbard wrote:

I want to do an experiment in brainwave entrainment by making a 7 Hz
sine wave oscillator out of an XR2206 frequency generator IC and a LM386
amplifier feeding a six inch diameter coil-- which should probably fit
around my fat head. ;-)

The LM386 has an 8 ohm output, so it shouldn't be hard to find a
speaker, if I wanted to use one; but I don't know how to make a good 8
ohm coil to radiate a nice clean undistorted signal-- how many turns,
what size wire to use, etc. Does anyone have any suggestions?

Ron

Before you invest a whole lot of time and energy into this project, you
might want to do some research into the topic, which is currently under
intense investigation. The technique is called "transcranial magnetic
stimulation," or TMS. Google will reveal endless information about it,
some of it highly detailed medical, neurologic, or psychiatric stuff.
You may do better checking out the patent applications for the various
types of coils that are being used.

From what I've read, low-intensity field have almost no discernible
effect. Not sure how this would relate to your project. It seems
difficult to reconcile the fields used by these researchers (in the range
or 1 to 2 T) to one in the nano-T range. You'd think that if people were
sensitive to nT intensities, they'd be thoroughly overwhelmed by a tesla
or two, if not actually injured.


--
Some men rob you with a six-gun -- others with a fountain pen.
-- Woodie Guthrie

 

[Winston]

Chiron wrote:

Before you invest a whole lot of time and energy into this project, you
might want to do some research into the topic, which is currently under
intense investigation. The technique is called "transcranial magnetic
stimulation," or TMS. Google will reveal endless information about it,
some of it highly detailed medical, neurologic, or psychiatric stuff.
You may do better checking out the patent applications for the various
types of coils that are being used.

From what I've read, low-intensity field have almost no discernible
effect. Not sure how this would relate to your project. It seems
difficult to reconcile the fields used by these researchers (in the range
or 1 to 2 T) to one in the nano-T range. You'd think that if people were
sensitive to nT intensities, they'd be thoroughly overwhelmed by a tesla
or two, if not actually injured.

Also check out the work of Dr. Ross Adey.

--Winston

 

[Jasen Betts]

On 2012-04-02, John G <greentest@ozemail.com.au> wrote:

Is the OP Ron Hubbard related to L Ron Hubbard? :-?

He's posted here before without mentioning Theremins.

--
⚂⚃ 100% natural

--- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---

 

[George Herold]

On Apr 2, 4:54 pm, Phil Hobbs <pcdhSpamMeSensel...@electrooptical.net>
wrote:

On 04/01/2012 04:42 PM, Ron Hubbard wrote:





On Mar 31, 6:25 pm, Bob Myers<bobmyer...@gmail.com>  wrote:
On Saturday, March 31, 2012 5:26:58 PM UTC-6, Ron Hubbard wrote:

Uh, probably a silly question but I guess I gotta ask: how would I
know the current? Any value I coulld think of now would really be
random and meaningless....

OK, so first things first: exactly what sort/intensity of a field are you wishing to create?

Bob M.

I had to take a look at this article again--

http://www.elfis.net/elfol8/e8elfeeg2.htm

-- as I am the kind of guy who would rather build something first and
worry about the mathematics behind it later (if at all).  Trial and
error is fun, but sloppy engineering I'm afraid.

But it seems like a radiated field of 100 nanoteslas should do the job
well, assuming my little project will work at all.

Ron

Sounds like just the sort of project for someone with a 6-inch diameter
head.   Maybe make it cone-shaped.  

Cheers

Phil

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot nethttp://electrooptical.net- Hide quoted text -

- Show quoted text -

Dang, Now we know what was in those conehead rings!
http://snltranscripts.jt.org/77/77nconeheads.phtml
Brain stimulating coils!

George H.

 

[Ron Hubbard]

On Apr 2, 9:55 pm, Chiron
<chiron613.no.sp...@no.spam.please.gmail.com> wrote:

On Thu, 29 Mar 2012 21:14:53 -0700, Ron Hubbard wrote:
I want to do an experiment in brainwave entrainment by making a 7 Hz
sine wave oscillator out of an XR2206 frequency generator IC and a LM386
amplifier feeding a six inch diameter  coil-- which should probably fit
around my fat head.  ;-)

The LM386 has an 8 ohm output, so it shouldn't be hard to find a
speaker, if I wanted to use one; but I don't know how to make a good 8
ohm coil to radiate a nice clean undistorted signal-- how many turns,
what size wire to use, etc. Does anyone have any suggestions?

Ron

Before you invest a whole lot of time and energy into this project, you
might want to do some research into the topic, which is currently under
intense investigation.  The technique is called "transcranial magnetic
stimulation," or TMS.  Google will reveal endless information about it,
some of it highly detailed medical, neurologic, or psychiatric stuff.
You may do better checking out the patent applications for the various
types of coils that are being used.

From what I've read, low-intensity field have almost no discernible
effect.  Not sure how this would relate to your project.  It seems
difficult to reconcile the fields used by these researchers (in the range
or 1 to 2 T) to one in the nano-T range.  You'd think that if people were
sensitive to nT intensities, they'd be thoroughly overwhelmed by a tesla
or two, if not actually injured.

--
Some men rob you with a six-gun -- others with a fountain pen.
                -- Woodie Guthrie

As a certain James T. Kirk says, "We learn by doing."

Ron




___________________

“This is the school in which we learn… time is the fire in which we
burn.”
–– Delmore Schwartz ––

 

[Winston]

Ron Hubbard wrote:

On Apr 2, 9:55 pm, Chiron
chiron613.no.sp...@no.spam.please.gmail.com> wrote:

(...)

From what I've read, low-intensity field have almost no discernible
effect.

Suggest read further, then.

Not sure how this would relate to your project. It seems
difficult to reconcile the fields used by these researchers (in the range
or 1 to 2 T) to one in the nano-T range. You'd think that if people were
sensitive to nT intensities,

I don't know about nT, but people are very sensitive to
*electromagnetic* power. Say 100 W/ m^2, and far less
provided the carrier is modulated properly.

they'd be thoroughly overwhelmed by a tesla
or two, if not actually injured.

It doesn't take nearly as much as that to put someone
on the ground or deny them use of their muscles.

The most dangerous stimulation is electromagnetic, done via
microwave carrier, not purely magnetic.
See Dr. Ross Adey's work, for example.
Also patents 3973290, 5675103, US 2007/0249959 A1

--Winston

 

[Chiron]

On Thu, 05 Apr 2012 06:07:27 -0700, Winston wrote:

Ron Hubbard wrote:
On Apr 2, 9:55 pm, Chiron
chiron613.no.sp...@no.spam.please.gmail.com> wrote:

(...)

From what I've read, low-intensity field have almost no discernible
effect.

Suggest read further, then.

Suggest you do so as well.

The fact that I disagree does not mean that I haven't read. Perhaps I
should have qualified my statement to read, "From what I've read in
*credible* sources..." Sorry if I didn't make this clear. I wasn't
talking about the endless Websites claiming to have discovered brand-new
physics, perpetual motion, free energy, and so on. I meant articles
about research done following such things as the double-blind protocol,
accurate measurements, that sort of thing.

Not sure how this would relate to your project. It seems difficult to
reconcile the fields used by these researchers (in the range or 1 to 2
T) to one in the nano-T range. You'd think that if people were
sensitive to nT intensities,

I don't know about nT, but people are very sensitive to
*electromagnetic* power. Say 100 W/ m^2, and far less provided the
carrier is modulated properly.

I think perhaps you do not understand the subject matter. For one thing,

what we're discussing *is* electromagnetic. That's what you get when you
pass a current through a coil - an electromagnetic field. AFAIK, if you
get the electro part, you automatically get the magnetic part; and vice
versa.

I'm not sure where you get the values in W/m^2, but you're comparing
apples and oranges. As any physics teacher will drum into your head, the
units have to match. Finally, no mention was made by the OP of any
carrier.

The OP was talking about intensities in the nanotesla range (abbreviated
nT). Actually, Dr. Pirsinger (the "God" helmet) was using intensities of
around a thousand times that - microteslas. Even so, the point still
stands. If you're getting a response at this intensity, then increasing
the intensity a million-fold is likely to be overwhelming. This is not
seen in practice.

they'd be thoroughly overwhelmed by a tesla or two, if not actually
injured.

It doesn't take nearly as much as that to put someone on the ground or
deny them use of their muscles.

It doesn't happen. People are routinely subjected to electromagnetic

fields of this intensity during MRI's. Unless they've got metal in their
bodies, they're just fine. I am not aware of any *credible* studies that
show anyone gets harmed by exposure to electromagnetic fields of this
intensity. If you are, then I suggest you cite to them rather than
telling me to "read further."

The most dangerous stimulation is electromagnetic, done via microwave
carrier, not purely magnetic. See Dr. Ross Adey's work, for example.
Also patents 3973290, 5675103, US 2007/0249959 A1

All well and good, but the OP was talking about a frequency of around 7

Hz. That's not microwaves. He said nothing about ELF modulation of a
microwave carrier, which in any case wouldn't be feasible with the
components he listed. Neither the XR2206 nor the LM386 is capable of
working at such high frequencies. IIRC, the XR2206 works up to 1 or 2
MHz. The LM386 is an audio amplifier.

Despite repeated efforts, Dr. Adey's work has not been confirmed by other
scientists. At most there are a few studies that seemed to suggest that
there might possibly be *some* effect from low-intensity microwave
exposure. However, most studies failed to duplicate Adey's results.

Dr. Adey's work follows some of the classical signs of pathological
science, as laid out by Dr. Irving Langmuir. I highly recommend Dr.
Langmuir's lecture (Google "Pathological science" to find various
transcripts of it).

But of course, as I said, the OP wasn't talking about modulating a
microwave carrier, or anything remotely like that. He was talking about
using an ELF sine wave to energize a simple coil.

--
Man is an animal that makes bargains: no other animal does this--
no dog exchanges bones with another.
-- Adam Smith

 

[Ron Hubbard]

Before you invest a whole lot of time and energy into this project, you
might want to do some research into the topic, which is currently under
intense investigation.  The technique is called "transcranial magnetic
stimulation," or TMS.

I already did the research--

http://www.elfis.net/elfol8/e8elfeeg2.htm


which is why I want an effective coil whose impedance matches the
amplifier though maybe I might just do what th author did and screw
the math...

Ron


_________________

“Logic is the science of being wrong with certainty.”

–– The Doctor (Ketterling’s Law) ––

 

[Jasen Betts]

On 2012-04-05, Ron Hubbard <orion@dslnorthwest.net> wrote:

Before you invest a whole lot of time and energy into this project, you
might want to do some research into the topic, which is currently under
intense investigation.  The technique is called "transcranial magnetic
stimulation," or TMS.

I already did the research--

http://www.elfis.net/elfol8/e8elfeeg2.htm


which is why I want an effective coil whose impedance matches the
amplifier though maybe I might just do what th author did and screw
the math...

Solid-state audio amplifiers have very low output impedance, I suspect that
instead you want to match the design load of the amplifier.

Look at a wire table to get the resistance per length and then compute
the mass and bulk of 8 ohms worth of that wire, thicker wire, having
less resistance per length will allow more turns in the coil (thus
stronger magnetic field) but it will be heavier, bulkier, and more
expensive too

--
⚂⚃ 100% natural

--- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---

 

[Winston]

Chiron wrote:

On Thu, 05 Apr 2012 06:07:27 -0700, Winston wrote:

Ron Hubbard wrote:
On Apr 2, 9:55 pm, Chiron
chiron613.no.sp...@no.spam.please.gmail.com> wrote:

(...)

From what I've read, low-intensity field have almost no discernible
effect.

Suggest read further, then.

Suggest you do so as well.

The fact that I disagree does not mean that I haven't read. Perhaps I
should have qualified my statement to read, "From what I've read in
*credible* sources..." Sorry if I didn't make this clear. I wasn't
talking about the endless Websites claiming to have discovered brand-new
physics, perpetual motion, free energy, and so on.

? What do any of these things have to do with brainwave
entrainment via an electromagnetic field?

I meant articles
about research done following such things as the double-blind protocol,
accurate measurements, that sort of thing.

I really do suggest you read further.
I'm not going to create a bibliography for you.

Not sure how this would relate to your project. It seems difficult to
reconcile the fields used by these researchers (in the range or 1 to 2
T) to one in the nano-T range. You'd think that if people were
sensitive to nT intensities,

I don't know about nT, but people are very sensitive to
*electromagnetic* power. Say 100 W/ m^2, and far less provided the
carrier is modulated properly.

I think perhaps you do not understand the subject matter. For one thing,
what we're discussing *is* electromagnetic. That's what you get when you
pass a current through a coil - an electromagnetic field. AFAIK, if you
get the electro part, you automatically get the magnetic part; and vice
versa.

Good, we agree that we are talking largely about the
same effect, brought about using different tools.

I'm not sure where you get the values in W/m^2, but you're comparing
apples and oranges.

Suggest you look at the patents I cited, particularly
US 2007/0249959 A1.

As any physics teacher will drum into your head, the
units have to match. Finally, no mention was made by the OP of any
carrier.

The OP mentioned the use of close-coupled electromagnets
in the extreme near field. Ya don't need no carrier under
those circs. Heck, you don't even need magnets of any
sort if you can put electrodes into the customer's brain.

Unless the customer is unconscious, he's got
nothing to fear from an almost pure magnetic field because
he can step out of the way before someone clamps a helmet
on him.

Microwaves? Not so much. They are very 'equal opportunity'
and are used at much further distances.

The OP was talking about intensities in the nanotesla range (abbreviated
nT). Actually, Dr. Pirsinger (the "God" helmet) was using intensities of
around a thousand times that - microteslas. Even so, the point still
stands. If you're getting a response at this intensity, then increasing
the intensity a million-fold is likely to be overwhelming. This is not
seen in practice.

It is not *discussed* in practice.

they'd be thoroughly overwhelmed by a tesla or two, if not actually
injured.

It doesn't take nearly as much as that to put someone on the ground or
deny them use of their muscles.

It doesn't happen. People are routinely subjected to electromagnetic
fields of this intensity during MRI's. Unless they've got metal in their
bodies, they're just fine. I am not aware of any *credible* studies that
show anyone gets harmed by exposure to electromagnetic fields of this
intensity. If you are, then I suggest you cite to them rather than
telling me to "read further."

The most dangerous stimulation is electromagnetic, done via microwave
carrier, not purely magnetic. See Dr. Ross Adey's work, for example.
Also patents 3973290, 5675103, US 2007/0249959 A1

All well and good, but the OP was talking about a frequency of around 7
Hz. That's not microwaves. He said nothing about ELF modulation of a
microwave carrier, which in any case wouldn't be feasible with the
components he listed. Neither the XR2206 nor the LM386 is capable of
working at such high frequencies. IIRC, the XR2206 works up to 1 or 2
MHz. The LM386 is an audio amplifier.

One needs to amplitude-modulate the microwaves at
specific low frequencies to get the necessary entrainment.

The OP does not need that technique. He's using
electromagnets on a volunteer, presumably with a
signed consent form and participation of professional
medical folks. Others have done it by implanting
electrodes into the customers head.

http://bipolarnews.org/?tag=deep-brain-stimulation

If your customers have not signed a consent form, you
have to bombard them with modulated microwaves if you
want the desired effect.

Despite repeated efforts, Dr. Adey's work has not been confirmed by other
scientists. At most there are a few studies that seemed to suggest that
there might possibly be *some* effect from low-intensity microwave
exposure. However, most studies failed to duplicate Adey's results.

Cite?

Dr. Adey's work follows some of the classical signs of pathological
science, as laid out by Dr. Irving Langmuir. I highly recommend Dr.
Langmuir's lecture (Google "Pathological science" to find various
transcripts of it).

But of course, as I said, the OP wasn't talking about modulating a
microwave carrier, or anything remotely like that. He was talking about
using an ELF sine wave to energize a simple coil.

Now you understand why the OP was talking about
'pop guns' and Ross Adey was talking about
'shot guns'. Don't concern yourself too much about
the kid with a spitwad if the guy behind him is aiming
a Mossberg at your head.

--Winston