Author Topic: The Master Of Magnetics "Steven Mark" (Read 1243093 times)

giantkiller · « **Reply #1365 on:** October 17, 2006, 06:30:51 PM »

@MOSfet item

Hi all,
I had a similar problem. I followed CTGlabs coil driver part of his circuit. All the drains were connected thru 1 hi-watt resistor. I have 8 drive channels and all the n-channel FET outputs stayed low while clocking. I swapped out the MOSfets with TIP41As. and same problem. I finally put all the Collectors thru their own resistors. My controller is now working. The TIPS can handle 40 volts @ 6 amps. That is ok. My avatar coil being wound of 16 gauge multistrand on iron core is too big for my current circuit. I can add higher power stage if neccessary. But now all of you that have wound smaller gauge coils are good. The drive requirements are easier. I am looking at the last SM TPU diags from Mannix and am thinking that at 10 cm diam a certain power factor is needed which requires a certain level of power to it. The diam is also part of the wavelength. I am stuck with wanting to shrink the diam to lower the wire gauge for less of a power requirement. But that might not match up with the required freqs with the wavelength of the diam. Going in circles here because I believe I am correct about the specifications. But I want, what I want, what I want.

Anyway, with the controller build stage out of the way I ponder coils now. I can definately see the impact of iron core saturation with what I am running. So that is the switch to Sm TPU air core/ wire core at this time.

--giantkiller

dutchy1966 · « **Reply #1366 on:** October 17, 2006, 07:09:13 PM »

Hi everyone,

In the latest schematics Mannix sent there are squarewave pulsetrains of 150 to 900 Mhz for up to 3 overlapping wavefronts.
Does anyone know of a schematic to make these fast pulsetrains?
I guess thinking along the lines of 555 timer doesn't get us anywhere....

Regards Dutchy

giantkiller · « **Reply #1367 on:** October 17, 2006, 09:07:06 PM »

Quote from: dutchy1966 on October 17, 2006, 07:09:13 PM

Hi everyone,

In the latest schematics Mannix sent there are squarewave pulsetrains of 150 to 900 Mhz for up to 3 overlapping wavefronts.
Does anyone know of a schematic to make these fast pulsetrains?
I guess thinking along the lines of 555 timer doesn't get us anywhere....

Regards Dutchy

Here: http://www.crystek.com/ just discrete parts. A ready made device might be expensive.

--giantkiller

giantkiller · « **Reply #1368 on:** October 17, 2006, 09:17:15 PM »

@Marco, you are amazing! And humble too, naming it after Jacob.
So many questions. Schematic forth coming?
So each layer is identical and those are LEDS off to the right?
What gauge wires, turns. I see 4 segments. What are the cores? Air, wire? If you read my posts today i am ready to fire up the next rendition or for that fact any other design.
I don't wan't to waste time without specifications. Great pictures.

--giantkiller

Jdo300 · « **Reply #1369 on:** October 17, 2006, 11:45:45 PM »

Hello All,

Does anyone have all the formulas that were used to calculate the resonant frequency of the toroid and a loop antenna? I saw some formulas here a while back but I can't remember which ones we though would be pertinent to the build. For those who are building coils, are you using the specs for the toroid itself to tune to a set frequency or are you basing the size on the collector coil diameter (like a loop antenna)?

As soon as I fix the booboo I made with my MOSFET I will be doing a few more simple tests with my transformer, and then I will begin to make the coil setup. I want to do a few calculations first though to get a ballpark idea of what frequency range it will work at, though I won't be all that bent out of shape over it. To construct my coil, I will be using some 122 strand, 30 gauge litz wire that I bought on eBay a while back (see picture). It will be used as the collector coil but I only have 10 feet of it to work with so I am trying to determine how many loops I will need to make for the collector coil. I am shooting for Mr. Mark's 4in TPU so I won't have to spend forever winding the toroidal coils (by the way, AWESOME COIL marco! Never would have thought to use Cat5 cable). I bought some clear vinyl plastic tubing from the hardware store to use as a former to wrap the toroidal coils onto. I will slit the tubing along its length to wind the collector coils on the inside and then I'll wrap the control coils around the outside :-). But if someone could assist me in figuring out the dimensions for this, it would be greatly appreciated.

God Bless,
Jason O

P.S. Forgot to mention that I am interested in figuring out the resonance frequency so I can roughly estimate what size wire and how many turns for the collector and control wires of the 4in TPU.

giantkiller · « **Reply #1370 on:** October 18, 2006, 12:12:52 AM »

Re: 7.8 hz toroid cals
--------------------------------------------------------------------------------
Quote from: giantkiller on October 11, 2006, 02:46:49 AM
Quote from: mikestocks2006 on October 11, 2006, 02:31:17 AM
yes, I had also posted something similar here for the 7.8Hz geofield frequency.

A sample toroid would be:

To get to 7.8 Hz and with use of an external capacitor
An example configuration, calculates
External C approx 39mF
Toroidal radius 10 cm
Coil radius 4 cm
Number of turns 1000
Air core

How does a poster quote a post to a message and back again? I have only been able to put 'page:xxx' in the message and then search for the page. Agh! It would be nice to take a page and post it to yourself.

--giantkiller

giantkiller · « **Reply #1371 on:** October 18, 2006, 12:17:17 AM »

@jason
page 391

Quote from: starcruiser on October 10, 2006, 10:55:39 PM

Guys,

I was doing some research and came across this article at http://users.netonecom.net/~swordman/Radio/re-loop-article.htm and found this to be of interest, we have been talking about tuning the collector coil to a particular frequency and this should be of help so I wanted to share this. excerpt:

Effective length (of loop antenna)

When we discussed active-antenna systems [in a prior article in the series, and which I don't have], we frequently mentioned the effective length of an antenna (often referred to as effective height). We can also talk about the effective vertical length of a loop antenna. An approximation for computing the effective length, LL, of loop antennas is

LL = (2*pi*n*A*Mu)/(wavelength) [Eq. 1]
Where wavelength is in meters; n = the number of turns in the loop; A = the cross-sectional area of one turn in square meters; Mu = the effective permeability of the core material ( = 1 for air core); and wavelength = (3*(10**)/(frequency in Hz). [That's wavelength = three times ten to the eighth power, then divided by frequency.]

Hope this is understandable.

Regards,

Carl

--giantkiller

Jdo300 · « **Reply #1372 on:** October 18, 2006, 12:27:03 AM »

Quote from: giantkiller on October 18, 2006, 12:12:52 AM

Re: 7.8 hz toroid cals
--------------------------------------------------------------------------------
Quote from: giantkiller on October 11, 2006, 02:46:49 AM
Quote from: mikestocks2006 on October 11, 2006, 02:31:17 AM
yes, I had also posted something similar here for the 7.8Hz geofield frequency.

A sample toroid would be:

To get to 7.8 Hz and with use of an external capacitor
An example configuration, calculates
External C approx 39mF
Toroidal radius 10 cm
Coil radius 4 cm
Number of turns 1000
Air core

How does a poster quote a post to a message and back again? I have only been able to put 'page:xxx' in the message and then search for the page. Agh! It would be nice to take a page and post it to yourself.

--giantkiller

What formulas did you use to calculate this? Just the normal formula for calculating resonance of a tuned LC tank? Or is there a specific one that is for use with toroids?

Also, I should bring this up again, but concerning the segmented collector coils. What is the present belief about how the rotating field is established? So far I have heard three possible setups.

1. The coils are setup like a two-phase motor (four segments) and fed independently in pares with two 90 degree offset pulses.

2. The coils are all simply connected in series and a pulse is fed into them

3. (From anonymous poster) the coils work with transistors and are self-triggering (I just might try that if I can wire it up right).

At this point, I'm going to try option 1. Though I may build in functionality for option three if someone could give me some vague idea of how to wire the setup. I know it involves using a pickup coil to trigger the MOSFETS but that?s about all I know there. The good thing about this setup is that the frequency can actually speed up whereas with option 1, I think the frequency is just determined by the pulse rate (right?).

@Stefan,

Is the upload folder issue fixed? I will be ready to post my demo videos of the transformer experiment later this evening.

God Bless,
Jason O

motofox · « **Reply #1373 on:** October 18, 2006, 12:37:39 AM »

http://video.google.co.uk/videoplay?docid=-1776848428018799270&q=genre%3ASCI_TECH

Jdo300 · « **Reply #1374 on:** October 18, 2006, 12:45:46 AM »

Hi giantkiller,

I do remember seeing that equation in the loop antenna link. But I think I am not using the formula correctly

LL = (2*pi*n*A*Mu*F)/(3.0*10⁸)

Okay, so LL is supposed to be the effective lengh of the loop antenna if it were straight?

Lets say that I have my collector coil made out of the Litz wire I mentioned before. If I use, say 5 loops of this wire, and I want to tune it to resonate at the 5000Hz spikes that I am pulsing into the control coils. I am shooting for the 4in diameter toroid so the area of my loop in meters comes out to be 0.008107m²; Mu is 1. So I plug it all into the formula:

(2Pi * 5 * 0.008107 * 1 * 5000) / (3.0*10⁸)

and I get 4.244*10^-6??

What does that mean? Apparently, I made a mistake somewhere that I'm not seeing. Or maybe I am using this formula completely wrong.

God Bless,
Jason O

Jdo300 · « **Reply #1375 on:** October 18, 2006, 01:39:32 AM »

Hi Lindsay,

Great tip

. I suppose I could just wind each control coil bifilarly with a smaller *tickle* coil to turn on the next coil. I wonder if there is any way to get a rough idea of how to tune the system to a specific target frequency? I?m guessing it would involve knowing the threshold voltage of the MOSFETs/Transistors and something with the inductance of the windings.

God Bless,
Jason O

EMdevices · « **Reply #1376 on:** October 18, 2006, 03:54:53 AM »

EMdevices · « **Reply #1377 on:** October 18, 2006, 04:49:00 AM »

Jdo300 · « **Reply #1378 on:** October 18, 2006, 04:56:48 AM »

OK I ran into another hitch here.

The good news is I got my MOSFET to switch finally :-). The bad news is that it seems to be limiting the amount of voltage that shows up across is when it is on. I am now using a charged capacitor as the voltage source and I charged it up to 200V. I then hooked up my signal generator to the base to switch it on and off, but the output would only go as high as the voltage my function generator was applying (~12V). I know that the MOSFET can handle up to 600V so I don't understand what the problem is. Here is the datasheet for the specific MOSFET I am using: http://www.ortodoxism.ro/datasheets/SEME-LAB/IRF460.pdf.

God Bless,
Jason O

EMdevices · « **Reply #1379 on:** October 18, 2006, 05:08:16 AM »

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