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  #31  
Old 06-07-2011, 03:01 AM
Farmhand Farmhand is offline
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I see so the secondary is wrapped around the "fence like structure" right next to him and the primary is wrapped around the bigger but lower fence like structure in the backround ?

I remember Eric Dollard said that winding the coils on a solid form is bad and a slat type structure should be used. And that the secondary should be as round as it is high. Hmmm cool.

I will just wind another tower type coil the same as what I have and install some sphere's or toroid dome's while I read some more of this thread. I'll also try to mount the primary on a frame.

Then I will try some things wirelessly.

Cheers
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  #32  
Old 06-07-2011, 03:03 AM
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Oh ok now I see, the bottom part of the secondary is quite close to the primary. Wow that is different. Ahah.
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  #33  
Old 06-07-2011, 04:08 AM
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Well all plans are now revised, I have 4 x 120 feet lengths of 0.5mm wire.

If I build frames kind of like in the picture but maybe solid for ease, then wind a two diameter/stage secondary like in the picture.

But how will I determin the diameter of the primary and the large part of the secondary and how many small turns on the secondary ? I have a PIC to pulse at Mhz frequencies but I'll have to work out how to use it later I can use a spark gap now though.

What frequency range will I need to use about, on a small setup for experiment ? I guess the longer the secondary the lower the frequency. But the calculations baffle me.

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  #34  
Old 06-07-2011, 07:39 AM
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did a small research on Tesla Transmission Magnifier, i found this:

Quote:
Below I describe what I have obtained working on the ideas that I found in the papers [1] and [2]. A set of formulas that allow, at least ideally (losses ignored, lumped model assumed as valid), the design of a perfect Tesla magnifier circuit, or triple resonance transformer, are presented.

A Tesla magnifier is a variation of the Tesla transformer where the resonator is separated from the secondary coil. The main objective of the modification is to obtain fast energy transfer without excessive voltage stress in the transformer. The magnifier is here modeled by the lumped circuit shown below:


Quote:
By April 2003 I started experiments with a 6th-order Tesla magnifier, in an attempt to verify if the design method developed for triple resonance networks can be also useful for an application intended for the production of sparks and streamers, a variation of the classical Tesla coil


A 6th-order Tesla Magnifier


Designing a Tesla magnifier

It looks like i answered my own question, don't you think?

Quote:
I see so the secondary is wrapped around the "fence like structure" right next to him and the primary is wrapped around the bigger but lower fence like structure in the backround ?

I remember Eric Dollard said that winding the coils on a solid form is bad and a slat type structure should be used. And that the secondary should be as round as it is high. Hmmm cool.

I will just wind another tower type coil the same as what I have and install some sphere's or toroid dome's while I read some more of this thread. I'll also try to mount the primary on a frame.

Then I will try some things wirelessly.
Farmhand, correct me if I'm not wrong but isn't that actually the principle of fractal, having a larger primary within which a smaller secondary is placed and so on....?

I am saying this based on this post http://www.energeticforum.com/142311-post45.html ,(second half of post)

Quote:
I found this document, which i think is authored by Nicolas Tesla, I have uploaded it, so as you can have access to it

Quote:
Quite different conditions exist in my system in which the electromagnetic waves or radiations are designedly minimized. the connection of one of, the terminals of the transmitting circuit to the ground having, itself, the effect of reducing the energy of these radiations to about one-half, Under observance of 'proper rules and artifices the distance is of little or no consequence, and by skillful application of the principle of "individualization," repeatedly referred to the messages may be rendered both non-interfering and non-interferable. This invention, which I have described in technical publications, attempts to imitate, in a very crude way, the nervous system in the human body

...I conclude that the invention wilt permit the simultaneous transmission of several millions of separately distinguishable messages through the earth, which, strangely enough, is in this respect much superior to an artificial conductor
.' Nicolas Tesla
a while back i wrote this in a post on fractal antenna:

Quote:
I think that Tesla was the first to realize the Constructal/ fractal properties of Nature and was able to use that in order to make a fractal antenna out of whatever he wished and to tap into the scalar waves as well. Some think that Scalar waves travel at the speed of thought (which is of course instantaneous), maybe it is and if so, then Scalar waves and "telepathy wave" are likely to be one and the same. Which leads me back to the title of this thread: The Brain is an Advanced Fractal Antenna.
Frontiers | Fractals in the nervous system: conceptual implications for theoretical neuroscience | Frontiers in Fractal Physiology

Quote:
This essay is presented with two principal objectives in mind: first, to document the prevalence of fractals at all levels of the nervous system, giving credence to the notion of their functional relevance; and second, to draw attention to the as yet still unresolved issues of the detailed relationships among power-law scaling, self-similarity, and self-organized criticality. As regards criticality, I will document that it has become a pivotal reference point in Neurodynamics. Furthermore, I will emphasize the not yet fully appreciated significance of allometric control processes. For dynamic fractals, I will assemble reasons for attributing to them the capacity to adapt task execution to contextual changes across a range of scales. The final Section consists of general reflections on the implications of the reviewed data, and identifies what appear to be issues of fundamental importance for future research in the rapidly evolving topic of this review.
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Last edited by MonsieurM; 06-07-2011 at 11:48 AM.
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  #35  
Old 06-07-2011, 12:06 PM
Farmhand Farmhand is offline
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OK I have some stuff together, I have PVC cylinders to wind th coils on, I have 100mm x 115mm diameter for the primary and secondary coil's "C" and "A" and 55mm x 505 mm for the third coil "B". I also have aluminium discs 100mm diameter and flexable vacuum cleaner hose to fashion some toroidal type top thingy's, I'll cover the flexable hose with aluminum foil.

http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

I have 1mm wire for the primary and 0.5mm wire for the secondary and third coils. I will wind the primary directly onto the bottom part of the secondary with only some insulation between. The secondary will take up between the line's on the big cylinder but the primary only a part of that at the bottom. and the third coil starts at the bottom line (top line a mistake) and go's as far as I think. the rest can be covered in aluminium as the cylindrical conductor in the patent up to the top toroid.

I am hopeless with figure's so I am going with intuition for the number of winds and I can adjust them later or rewind. I will build two exactly the same at the same time.

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  #36  
Old 06-07-2011, 12:42 PM
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You dont need to know all the math and such, but it will really help to just use tools available online. Here are some sites that will do the calculations for you.

DeepFriedNeon - Tesla Coils

OLTC Calculator

Javascript Tesla Coil Designer

LC Resonance Frequency Calculator at WhatCircuits.com

There is a lot of hearsay about the magnifyer design, most of it I think is all junk made by folks that have never built or tested it. You dont need to use that exact design to get results, but i do prefer the helical coils. A simple design for low voltage testing would be making a setup like solid state tesla coilers like to make. Just one secondary and a closely coupled helical coil primary. Here are some examples.





I would encourage you to test all the different coils and setups and draw your own conclusions and try to learn why he settled on the magnifyer design. After testing many coils I believe i have a good idea of why its designed as it is but i still have more testing to do myself.
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  #37  
Old 06-07-2011, 01:11 PM
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Quote:
Take also a look in my double resonance simulator TeslaSim, that allows experiments with Tesla coil circuits, and also inversion of Laplace transforms. The program MagSim, that designs systems based on the formulas presented here, and can generate Laplace transforms to be used in the TeslaSim program, is also available. See also the program Mrn6.

Designing a Tesla magnifier

A transformerless Tesla coil

Quote:
This circuit has several potential advantages over a simpler directly coupled Tesla coil: Faster energy transfer from C1 to the distributed terminal capacitance C3, what results in smaller losses, greater efficiency, and insensitivity to tuning precision. The wider notches in the primary waveforms tend to cause fast quenching of the spark gap, at the first notch, trapping all the energy in the high-voltage part of the circuit. The design is restricted by the absence of the extra degree of freedom allowed by a transformer in the classic magnifier circuit, with the maximum voltage gain being forced by the ratios among the resonance frequencies, but the transformerless construction is simpler.
Voltage waveforms:




Coil in Coil Design:

Quote:
b).
A further advantage of the coil-in-coil design is that the trigger field and self
field have the same direction and their values add up directly, whereas in the tubein-
coil design both fields are perpendicular to each other.
http://ewh.ieee.org/tc/csc/europe/ne...al2_011108.pdf

hope this helps:
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  #38  
Old 06-07-2011, 04:01 PM
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OK thanks for all the info, I have finished my first coil. It's a Secondary or Coil "A" as per Tesla's patent.

These are the coil dimentions,

Coil "A" - 2.09 mH - 5.2 Ohms - 147 turns - 117.5mm x 73.5mm. Close to the one you linked above but a bit smaller.
http://public.bay.livefilestore.com/...004.JPG?psid=1

I'm about to wind the matching one now. The coil above used 1 of the 4 strands of 0.5mm wire I have. I'll use exactly the same amount of wire in the Coil "B" if it fits on 55mm x 505mm. I'll use a close coupling like it says in the patent, so I'll make a 1mm thick or so bed of bee's wax for the primary to wind onto.

I have no idea how many turns to use on the primary. I'm thinking 16 turns maybe more or less that will be easy to experiment with.

Thanks again for all the info.

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  #39  
Old 06-07-2011, 04:11 PM
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Ummm, should I wind the receiver CCW ?

The transmitter is CW.

Hmmm
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  #40  
Old 06-07-2011, 10:31 PM
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Quote:
Ummm, should I wind the receiver CCW ?

The transmitter is CW.

Hmmm
Yet another topic I hear a lot of conjecture about but little seems to have been done to prove or disprove any of it. Im currently set up to test it, but have not finished that test yet. At this point i would say it doesnt matter, it will definatly work if they are both the same CW or CCW, that much i can say for sure. If you get the coil bug like i have you will probably be making many more coils in the future anyways.

You may consider not winding the primary directly onto the secondary but instead onto a slightly larger tube of some sort. That way you can slide the primary closer or farther from the secondary to adjust your coupling between the coils. A function generator and an o scope really come in handy for these experiments to find the resonant frequency of your coils easily.

Quote:
I have no idea how many turns to use on the primary. I'm thinking 16 turns maybe more or less that will be easy to experiment with.
As for the primary, personally i like more turns for these low power test coils. But your setup may work better with less because you have so few turns on your secondary. Too few turns however and you might not have a good enough coupling between your coils. Welcome to some of the fun little headaches that turn your brain to mush. Less turns on primary will give you a higher turns ratio for the transformer and a higher voltage rise. This is easy math:

147 turns on your secondary divided by 16 turn primary = about 9. Thats a 9:1 ratio. Bear in mind I find my best preformance for these test coils at a much higher ratio more like 100:1.

One idea might be to make say a 16 turn primary but make taps at every 2 turns or so. That way you could just play with it and see which one works best.

Tesla was feeding his primary with 40 kilovolts so he was ok with a lower turns ratio. I do a lot of testing with really low voltage and adjust my coils to preform with such a low voltage, which means a higher turns ratio. But then you have coil inefficencies inherent in their design and have to worry about too much resistance from the long length of wire and all kinds of other things that make you want to pull your hair out and just keep making different coils.

Either way, im sure yours will preform fine as long as you can find the resonant frequency.
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  #41  
Old 06-07-2011, 11:45 PM
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Thanks Cody, I got these results from the TC designer thing.

http://wv0v9q.bay.livefilestore.com/...ecs.jpg?psid=1

http://wv0v9q.bay.livefilestore.com/...lts.jpg?psid=1

That was with only a 4 turn primary and 1mm coupling, so I will make the primary moveable like you suggest.

I still have the same amount of wire to go on the 55mm x 505 mm former for Coil "B". I guess with that coil aswell the primary can be more turns.

How do I add that to the calculation ?

I'll wind them both the same that is also my intuition that it will not matter, the spiral coils on Tesla's other wireless patent are opposite but the wired one has them the same, if you flip a spiral the winding direction changes anyway.

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  #42  
Old 06-08-2011, 01:26 AM
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Here is a coil "B",

It is 1.51 mH - 5.4 Ohms - 306 turns - 153 mm x 55mm. I wound it a bit low on the former so i can raise it up if needed, Tesla says in his patent that he starts the bottom of coil "B" just below the height of the top of the Coil "A".

I also left a space below coil "A" for the primary to go down if needed, to free up the oscillations I guess.

http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

I wonder does the coil "B" and Coil "A" added together determin the resonant frequency ?

Once i start winding coils I am lost in another world. I could wind coils all day but i have to do some work sooner or later.

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  #43  
Old 06-08-2011, 01:38 AM
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With only a few turns on the primary, couldn't I add a self inductance coil like this with a cap to the primary circuit so it will perform better with low voltage supply ?

Tesla's Ignition coil patent. If the primary has to little self inductance it is difficult to pulse well. I will try this even if it doesn't work as a very simple option incase it does work. Sizing the cap and adjusting the inductance of the self inductance coil could be difficult.
NIKOLA TESL-A - Google Patents

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  #44  
Old 06-08-2011, 01:43 AM
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So your setup will resonate at around 688KHz without the coil B. That seems pretty low for how short of a coil you have. You added in a toroid or sphere for the topload capacitance? Im assuming that you must have to get the frequency down that low.

Anyways, to answer your question about adding the other coil I will say this: those calculators are only so good, they will give you an idea but can be off a fair amount. We will just assume its close and your target frequency just with coil A is 688KHz. When you add coil B to that coil you are basically lengthening the coil, so you will essentially be adding inductance and self capacitance. The more inductance and capacitance, the lower the resonant frequency is. So your new frequency will be somewhere lower than 688KHz. One thing you could do is plug coil B's figures into one of the links i provided for just a reqular Helical coil. It will spit out coil B's inductance and self capacitance. Then you could go back into the coil calculator you just did and posted, and record coil A's inductance and capacitance. Then play with the coil diameter and length until the new inductance and capacitance matches what it would be if you added the figures from coil a and b. It will then spit out a new resonant frequency which should be lower than what it is now. But once again, that calculator is only so good, especially if your trying to rig the results like i described above. If it were me i would just build the thing and hook it up the the function gen with a scope probe nearby and could tell you within a minute what the resonant frequency is. If you dont have those available than i would build some oscillator circuit and hook it up and place a simple AV plug with an LED in it near the top of the coil, it will light up the brightest when you hit the main 1/4 wave resonance.
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  #45  
Old 06-08-2011, 02:03 AM
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Quote:
Originally Posted by MonsieurM View Post
Farmhand, correct me if I'm not wrong but isn't that actually the principle of fractal, having a larger primary within which a smaller secondary is placed and so on....?

I am saying this based on this post http://www.energeticforum.com/142311-post45.html ,(second half of post)

Yes you are right, all three coils are the same helical geometry but different dimentions. Even winding exactly the same length wire on different former sizes give's different coil specs, a smaller diameter former give's less inductance but more DC resistance.

Interesting, I must admit I have not read all the posts completely or visited all the links, but I will, you have presented an impressive amount of reference material.

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  #46  
Old 06-08-2011, 02:28 AM
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OK this looks very promising, this is the calculation results i get if I double the Coil "A" length and use 24 volts as the primary cap charge at 437 Khz, with a 17 turn primary.

http://wv0v9q.bay.livefilestore.com/...c-3.jpg?psid=1

That is difficult to beleive. 2 joules per bang at 437 Khz, umm will it kill me .

That is with 12 watts or max current of 0.05 amperes at 240 volts. The average current is even less.

Does that realy mean 854000 jouls per second ? Somebody tell me it isn't going to be that powerfull, please .

Secondary voltage out says 128 volts.

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  #47  
Old 06-08-2011, 02:36 AM
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I must have missed some of your posts, i didnt realize how you had another coil there. Looks good so far. Also, with what i provided you secondaries will not be operating in triple resonance as the links provided by MonsieurM, interesting links by the way. Instead your two secondaries will electrically behave as if they were just one coil. You can follow MonsierM's links if you want to do all the calculations to achieve the triple resonance effect. Im not sure if anyone is certain weather tesla was actually using that effect or not. By no means is it necessary to get results however.
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  #48  
Old 06-08-2011, 02:43 AM
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I generally just ignore that part of the calculation. As always be careful just play with low voltage, 12 volts will work fine for testing and will be safe, just watch out for charged capacitors, they are dangerous.
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  #49  
Old 06-08-2011, 03:13 AM
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Quote:
Originally Posted by cody View Post
I must have missed some of your posts, i didnt realize how you had another coil there. Looks good so far. Also, with what i provided you secondaries will not be operating in triple resonance as the links provided by MonsieurM, interesting links by the way. Instead your two secondaries will electrically behave as if they were just one coil. You can follow MonsierM's links if you want to do all the calculations to achieve the triple resonance effect. Im not sure if anyone is certain weather tesla was actually using that effect or not. By no means is it necessary to get results however.
Yeah cool, I'll just go with as close to the Tesla patent as I can get. Above coil "B" on the PVC tube I will wrap aluminuim foil and connect it to the wire near the coil top and drape it over the top of coil "B" the wire will go up the center of the PVC tube aswell and both the foil and the wire will join to the disc and toroid assembly, which will also be covered in foil. I'll put a pop rivet in the disc just off center for a pinpoint safety discharger (I just wont pop the rivet).

Untill you pointed it out I never did see that actual patent and so I didn't understand the drawing all by itself. Now I read the patent i understand it better.

Because I am new to this stuff and I am very interested in utilizing all type's of radiant energy using plate"p" setups, I thought I should make a transmitter receiver so I can compare the performance of a plate "P" with a dedicated receiver. So as to refine the plate "P" design and also trees instead of the plate "P", Like Monsieur suggests, if I have some prior experience I can better focus on the tree situation.

This arrangement of Tesla's is obviously where all the exciters come from.

What exactly should I call it ? Is it a magnifying transmitter ?

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Old 06-08-2011, 03:28 AM
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It should end up looking something like this. Which is pretty close to Nikola's drawing and patent.

http://wv0v9q.bay.livefilestore.com/...002.JPG?psid=1

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  #51  
Old 06-08-2011, 03:45 AM
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Originally Posted by cody View Post
So your setup will resonate at around 688KHz without the coil B. That seems pretty low for how short of a coil you have. You added in a toroid or sphere for the topload capacitance? Im assuming that you must have to get the frequency down that low.

Anyways, to answer your question about adding the other coil I will say this: those calculators are only so good, they will give you an idea but can be off a fair amount. We will just assume its close and your target frequency just with coil A is 688KHz. When you add coil B to that coil you are basically lengthening the coil, so you will essentially be adding inductance and self capacitance. The more inductance and capacitance, the lower the resonant frequency is. So your new frequency will be somewhere lower than 688KHz. One thing you could do is plug coil B's figures into one of the links i provided for just a reqular Helical coil. It will spit out coil B's inductance and self capacitance. Then you could go back into the coil calculator you just did and posted, and record coil A's inductance and capacitance. Then play with the coil diameter and length until the new inductance and capacitance matches what it would be if you added the figures from coil a and b. It will then spit out a new resonant frequency which should be lower than what it is now. But once again, that calculator is only so good, especially if your trying to rig the results like i described above. If it were me i would just build the thing and hook it up the the function gen with a scope probe nearby and could tell you within a minute what the resonant frequency is. If you dont have those available than i would build some oscillator circuit and hook it up and place a simple AV plug with an LED in it near the top of the coil, it will light up the brightest when you hit the main 1/4 wave resonance.
I have a scope but it is a cheap analogue and only 5Mhz.

You mean to use the scope like I do in this video.
YouTube - ‪AlternateFarmhand1's Channel‬‏

I forgot to post it earlier, it's a little embarrassing, but it is amazing how much one can learn in a short time. I had some fun with some flame plasma with that setup, but it is scrapped now, haha.

Orange stuff in a bulb
YouTube - ‪AlternateFarmhand1's Channel‬‏

I think to wind my primaries I will just wrap a piece of cardboard around coil "A" to give me a space, then wrap a strip of plastic around that then wind the coil and attach it to the plasstic afterwards the cardboard can be removed and the primary will be moveable. I hope.

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  #52  
Old 06-08-2011, 12:41 PM
cody cody is offline
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yea i think that was right. Here is a vid of Doc Stiffler explaining it.

YouTube - ‪How to measure srf or Spatial Resonant Frequency of a Coil‬‏

here is another good one

YouTube - ‪Tuning A Tesla Coil with an Oscilloscope‬‏

I would leave off the spark discharger point, that will radiate your energy away, and you dont want that if your trying to transmit power. But maybe you want that for some of your other experiments. You may want to cut slots in the hood too, you can just cut slits in it at the bottom going all the way to the bottom, otherwise the coil will think its another coil dead shorted on top of it.
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Old 06-08-2011, 02:17 PM
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Hi Cody, How many winds would you recomend i make for 12 volts and how close should I make the coupling you think. I was going to go with 17 or 23 turns right next to each other, however that would only cover 23 mm of 73 mm of the "A" coil, I can't decide.

I have about 20 turns (pre coiled) laying around a tooth-picket fence ready to wind som turns and glue the wire to some tooth picks. THe toothpicks will have only slight gap less than 1mm but the primary will be about 2mm clearance all around.

I think the hood is only needed for really high voltage to catch the energy trying to escape there and guide it up to the toroid, the metal tube acts like a big single pipe conductor, and from what I have read the energy from a Tesla coil runs across the windings to go straight up, then it seems when the coil ends(without the hood and tube) the energy scatters, so the hood and metal tube seem like a wave guide to me.

I also found out that connecting the two secondary coils together make's the inductance more than the sum of both, together they are 4.02mH but 2.09 + 1.51 equals 3.6 Hmmm, so that's good ?

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Old 06-08-2011, 06:17 PM
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Here are some pics so far, not sure if the primaries will work like that. But I'll try it.

http://public.bay.livefilestore.com/...005.JPG?psid=1

http://public.bay.livefilestore.com/...006.JPG?psid=1

http://public.bay.livefilestore.com/...003.JPG?psid=1

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Old 06-08-2011, 08:24 PM
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Haha,now that look's better, maybe just plain aluminium discs will be better on top. Just gotta mount them on something, and setup a circuit to excite the primary.

http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

http://wv0v9q.bay.livefilestore.com/...002.JPG?psid=1

I might cut and attach a piece of aluminium pipe to each top disc so it hangs loosly inside.

I have to wait for the sun to come up so I can paint some boards or something.

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Old 06-08-2011, 10:30 PM
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That looks pretty good. Should work fine for some testing at 12V You are right about the hood being used to catch escaping energy. When playing with tesla coils at HV you might notice corona developing at the top of the coil, that is what the hood is for to keep it from leaking out. The secondary having more inductance is a good thing, it will lower the resonant frequency. Also the larger the toroid the lower the frequency, as well as the higher you mount the toroid from the coil the lower the frequency. Once you get playing with it you will notice the coils preform much better at lower frequency as long as the parameters are correct. Looks like your pretty much ready to go once you get an oscillator set up.
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Old 06-09-2011, 04:10 AM
Farmhand Farmhand is offline
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I gave it a tickle with the circuit I was already using and got a very wierd looking waveform with the scope probe hanging about a foot from the toroid.

This almost looks like 3D.
http://wv0v9q.bay.livefilestore.com/...004.JPG?psid=1

http://wv0v9q.bay.livefilestore.com/...002.JPG?psid=1

I put a 264uH inductor and a variable cap(40pf to 1300 in the "after circuit" as per the ignition coil patent. Seemed to work, this circuit would not work well with a coil of such low inductance, but now it can.

I got 38 Khz with the circuit the way it is, I can get over 200 if I put a 10 time's smaller timing capacitor on the oscillator. The transmitted power was rising but I ran out of frequency

Adjusting the variable cap is very fine tuning.

I've got some more wire I can put on the coil's if I want there is enough for 220 turns on each one or 110 mm. That will make 670 turns except the primary, I've got some polyester sealer to reinsulate the wire. I think I just need to make it a smooth.

The transmitting is definately working but weak, I have only one ground stake so far. I think I made the primary coupling a bit too loose for 12 volts.

And just a flat disc is woking better as the transmitter/receiver.

Cheers
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Old 06-09-2011, 12:40 PM
cody cody is offline
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The wave forms look like your not in tune yet. They should be a pure sine wave that have a high voltage peak once in tune. The system will work much better one you get it in tune, I would hold off on adding more wire until you get it working first. Is your circuit feeding DC square waves by chance? Also dont expect to get any good results trying to transmit through the ground if your just using 12V. I would just use a wire between the two coils for now, the voltage isnt high enough to overcome ground resistance. What i really like about these little setups is although they dont do so good through the ground, they are an excellent learning tool that is easy and safe to play with while learning exactly how to tune and load the system and how it behaves.
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Old 06-09-2011, 01:23 PM
Farmhand Farmhand is offline
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Yes youre right, square wave I did learn a lot today about the inductor-cap relationship in the primary circuit setup I used today, it did improve performance and give's very fine tuning. I really need to learn how to use PIC's. And I will soon.

But first I will try to max out this oscillator, it has a faulty electrolytic cap so i'll replace that and i'll put a 0.001uf timing cap in place of the 0.01uf it has now. I should get over 200 Khz then. Nowhere near the Mhz I will need but I can play with that for a bit, I have had one of these circuit's oscillating reliably at over 1 Mhz but it was impossible to tune acurately at that frequency with a 100k pot . I need to get a USB cable so I can start to learn to use the micro.

I found the optimum height for the primary which is much lower than I had it for the first test. I also had very poor electrical connections at the top in several places but it does work, I dare say with some tinkering it will be effective.

One thing is the final circuit to receive I have a 0.1uf non polarised cap across the transformer output then a FWBR, I measured a maximum 1.9 volts on the receiver using a 600mm square aluminium plate on the concrete for a ground, the transmitter read 3.9 volts AC measured directly with a meter.

That doesn't sound much, but the 1.9 volts is stepped down and rectified remotely from 3.9 volts AC on the transmitter secondary, so the transfer seems resonable considering the lack of tuning and the loose coupling with low voltage. Very promising really. The input power was less than 100 Ma when the best transfer took place but that is very low power.

I get the feeling that a direct ground wire between them won't work so good but I don't know why, something about tying them directly together, I'll try it again though.

Cheers
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Old 06-09-2011, 01:45 PM
Farmhand Farmhand is offline
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THis is the circuit I used today, without the extra inductor I would not have been able to pulse the primary because it's inductance is very little. A few uH is all the primary itself has.

http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

I have other inductors to try and another broadcast cap identical to that one.
Maybe I need to use a tunable cap on the receiver too. Hmmm.

Cheers
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