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Eric Dollard Official Forum This forum is dedicated to the work of Eric P. Dollard. His Official homepage is http://ericpdollard.com

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  #1  
Old 11-08-2014, 02:42 AM
speakerbox speakerbox is offline
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Eric Dollard Style Tesla Coil Verses Standard Tesla Coil

Dear Forum,
I build a spreadsheet to simplify calculations that Eric provided for building a Cosmic Induction Generator (CIG).

I was puzzled but not surprised when his calculations came up way different than JavaTC.

After a bit of messing around I realised they roughly equal the calculated resonant frequency devided by 1 over 2pi.

For example Eric provided the dimensions for a 1mhz coil. JavaTC calculates the resonant frequency to be 1.467mhz.

1.467÷(1÷2pi) = 0.93392mhz

I also did the same calculation using a 20% and 50% primary height with 62% and 10% spacing. The answers were all about 10% out.

So my question is: what causes these figures to be so different than they should be?

A coiled wire will not have the same resonant frequency as a straight one of the same length.

According to JavaTC and my own experience building coils the coil will work poorly using these plans.

As the primary will oscillate at 1mhz the secondary at 1.4mhz will be 40% detuned.

So is Eric saying his coil is not a air core resonant transformer with frequency matched coils? If not what principle does it operate by?

Pancake coils will produce fractals so what is the advantage of trying to build the CIG?

Also why must the coils be the same diameter. It makes calculation complicated and seems impractical.

One final comment about the primary coil. I see no advantage in using flat copper strip as the frequency will be below the 10's megahertz range and as the system will be CW so the primary current will be pretty low.

Cheers!
-speakerbox
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  #2  
Old 11-08-2014, 01:53 PM
Marcus Neuhof Marcus Neuhof is offline
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I'm not an expert, but the answer is probably something along the lines of "these coils don't obey traditional electromagnetic physics, that's the whole point of building them after all, so calculation tools that rely on traditional electromagnetic models naturally won't work!"
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Old 11-09-2014, 04:59 PM
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Quote:
Originally Posted by speakerbox View Post
According to JavaTC and my own experience building coils the coil will work poorly using these plans.
How do you define working well?

Quote:
Originally Posted by speakerbox View Post
So my question is: what causes these figures to be so different than they should be?
Quote:
Originally Posted by T-rex
There should not be much left unanswered, it is all in the "Theory of Wireless Power" and "Impulses, Waves and Discharges." But all of this pre-supposes a working knowledge of radio frequency lines and antennae.

Velocity depends on aspect ratio. If Secondary ratio is 18%, velocity is luminal, this only at 18%. So make the coil 20% and the velocity is a bit faster than luminal. The reason, to compensate for the slowing caused by insulation.

The secondary is coupled to other coils and capacitance. This lowers the velocity greatly. Thus to compensate the coil wire is shortened by 2/pi=0.63662=63.7% to bring the frequency back up to the proper value.

As for the extra coil; for a coil aspect ratio of 100% the coil effective velocity is 187% that of luminal velocity (along the coil wire). This coil is burdened down by insulation and gradient rings as well as what little coupling Exists. Thus the coil Wire is lengthened to 157% velocity factor. This is to say, rather than calculating the extra coil on a velocity of 187% that of light along the coil wire to figure the quarter wave, we now instead, in order to compensate for the burden, use a velocity of 157% that of light along the coil wire to figure quarter wave. 157% is equal to pi/2.

Therefore, secondary 2/pi, extra coil pi/2.

(Longer Extra)/(Shorter Sec.) = (pi/2)/(2/pi)=pi^2/4=2.465

Where pi is a correction factor, not an intrinsic mathematical relation. But it may be that by using pi some "magic" resonance may take form. (Experiment and see).
Quote:
Originally Posted by speakerbox View Post
As the primary will oscillate at 1mhz the secondary at 1.4mhz will be 40% detuned.


Quote:
Originally Posted by speakerbox View Post
Pancake coils will produce fractals so what is the advantage of trying to build the CIG?
The CIG is a particular configuration and application of the coils, like a pizza is a particular configuration and application of the ingredients. A lone tomato is not a pizza, and likewise a single coil (or two) not connected appropriately is not a CIG.

Quote:
Originally Posted by speakerbox View Post
Also why must the coils be the same diameter. It makes calculation complicated and seems impractical.
Eric's design is based on Tesla's Colorado Springs design. The only way I imagine that it could be complicated is because you have other JavaTC nonsense on your mind. Forget that and use basic calculations.
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Old 11-09-2014, 09:38 PM
speakerbox speakerbox is offline
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Dear dr-Green,
Thank you for taking the time out to answer my questions.

I define working well as either a very strong E field or sparks equal or double the diametre of the coil.

The reason why nobody builds Tesla coils with so few turns is they need to be physically large to have a low enough frequency.

I made a all wood coil form 600mm by 600mm yesterday.

I will not be able to fit the following guidlines:
1. 20% of width for height
2. Conductor diameter
3. Flat strip secondary 18% width of diametre
4. Same weight for capacitors and secondary coils

I will build an Armstron oscillator and see what frequency it performs the best at. Seems as the turns ratio is fixed it will be hard to tune as I can only adjust capacitance in the tank circuit. I will be using Vacuum Capacitors.

If that fails I will use a spark gap system.

I will use a 50% aspect ratio and 62% spacing and the frequency will be 1250 kc using a 20 turn secondary.

Looking forward to seeing the results.

speakerbox
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Old 11-10-2014, 01:57 AM
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Hi speakerbox.
Good that you are building stuff.

Quote:
Originally Posted by speakerbox View Post
“I define working well as either a very strong E field or sparks equal or double the diameter of the coil”
Well a ‘working well’ Tesla coil produces no spark at the termination, as this is wasted energy. The output is the neutral terminal, where the displacement current manifests. You use this ‘telluric output’ as a measure as to how well it is working..



If you ground your telluric output to the primary coil ground / common ground you will obtain more sparks off the termination. If you are after sparks then it is not the length of the spark it is the quality of the spark! Ideally it would look something like this: Although to produce sparks like in this picture, the CW power would be in-excess of the legal limits! (At least in my country).



Quote:
Originally Posted by speakerbox View Post
“ “The reason why nobody builds Tesla coils with so few turns is they need to be physically large to have a low enough frequency”.
This is one of the reasons why Eric designs for certain ham bands where the frequency is ~2Mhz range and up. (160m, 80m bands).

Quote:
Originally Posted by speakerbox View Post
“I will use a 50% aspect ratio and 62% spacing and the frequency will be 1250 kc using a 20 turn secondary”.
Be careful, isn’t 1250Kc within the AM radio station spectrum!?

Hope you share your building progresses!
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Old 11-10-2014, 04:21 AM
speakerbox speakerbox is offline
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Dear Sputins,
Thank you for your reply.

I was lead to believe Tesla Coils don't emit much RF.

As for your concerns about interference I am not worried. I live 30km from the nearest transmitter. I may use a seperate ground so I don't fry my household electronics though.

I will probably be looking at 2kw up in power. GU 81ms can handle that for short runs.

I will post when I am successful.

-Wil
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Old 11-10-2014, 04:47 AM
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Quote:
Originally Posted by speakerbox View Post
Dear dr-Green,
Thank you for taking the time out to answer my questions.

I define working well as either a very strong E field or sparks equal or double the diametre of the coil.

The reason why nobody builds Tesla coils with so few turns is they need to be physically large to have a low enough frequency.

I made a all wood coil form 600mm by 600mm yesterday.

I will not be able to fit the following guidlines:
1. 20% of width for height
2. Conductor diameter
3. Flat strip secondary 18% width of diametre
4. Same weight for capacitors and secondary coils

I will build an Armstron oscillator and see what frequency it performs the best at. Seems as the turns ratio is fixed it will be hard to tune as I can only adjust capacitance in the tank circuit. I will be using Vacuum Capacitors.

If that fails I will use a spark gap system.

I will use a 50% aspect ratio and 62% spacing and the frequency will be 1250 kc using a 20 turn secondary.

Looking forward to seeing the results.

speakerbox
As Eric said in the quote above, propagation velocity depends on aspect ratio. For this reason wire length and frequency relations are not reliable to base a design on. You can calculate the approximate frequency quite closely from L and C for any given aspect ratio, as given in the Resonant Circuits bit above. That is, L and C of the secondary coil. The primary is tuned to this frequency. If L is fixed then C can be calculated from the LC constant, or found experimentally (far more easily with variable capacitors than fixed ones).

LC Constant = LC = 25330/f²

The CIG is said to not transmit, since each coil is 'transmitting' into the other rather than the earth. But if you are using one coil then with 2kW you will be lit up like a beacon.

Also as Sputins mentioned, a coil that produces big sparks is not "working well" according to Tesla's definition, in fact quite the opposite since Tesla had a lot of trouble trying to suppress sparks. Being a 'system of transmission of electrical energy', working well means efficient and effective transmission of electrical energy through the system, and not efficiently wasting energy into space with sparks. Although obviously it will produce sparks efficiently almost as a secondary effect if that's the intended application or mode of operation. The thing is not specifically designed in the first place to produce sparks. It's 1/regular "Tesla coil" design.
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Old 11-10-2014, 12:09 PM
speakerbox speakerbox is offline
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Dear dR-Green,
I made a quick spreadsheet to calculate all dimensions of the CIG.

I copied the extra coil part from the secondary coil calculations as Eric Dollard's "Tentative" calculations didn't make sense.

All Yellow areas are user input. And it will convert between m, to cm to mm in separate columns. Coil frequency, primary turns, tank cap, secondary and extra coil ratio and spacing ratio are adjustable.

We don't use inches in Australia so maybe you can add inches and feet etc.

I added a very rough spiral coil inductance calculator and LC calculator to get a gestimation of the primary cap needed. Saves pounding away on the calculator all day.

Plus you get to see what frequency is easiest to build to.

Could you or someone with more experience than me check my calculations?

If it proves useful maybe we could sticky it somewhere.

Here it is: https://www.dropbox.com/s/i1kl6apy4e...ator.xlsx?dl=0

-speakerbox
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Old 11-10-2014, 12:38 PM
speakerbox speakerbox is offline
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Dear All,
Here is my spreadsheet calculator's output for a 30 turn secondary CIG.

The figures match Eric Dollard's ones for a 1000 kc coil.

See: https://www.dropbox.com/s/0qyrf2co4y...lator.png?dl=0

-speakerbox
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Old 11-11-2014, 02:35 AM
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Quote:
Originally Posted by speakerbox View Post
Dear All,
Here is my spreadsheet calculator's output for a 30 turn secondary CIG.

The figures match Eric Dollard's ones for a 1000 kc coil.

See: https://www.dropbox.com/s/0qyrf2co4y...lator.png?dl=0

-speakerbox
Hey speakerbox

What state are you in?
I am in Adelaide, South Australia.

The spreadsheet is great, although others have made them before. They are certainly helpful for designing coils for a certain frequency and how big it’s going to be. Eric’s calculations on the Secondary are generally very good. The extra coil calcs are only ‘tentative’ - needs work. I would suggest to you to work with the secondary alone at first, add in the extra coil later on. You can achieve most of the effects with the secondary coil alone. - However do as dR green suggests.
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Old 11-12-2014, 10:30 PM
speakerbox speakerbox is offline
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Dear Sputins,
I live in Broome, WA.

As for the extra coil. I am attracted to this idea of a low turns Tesla Coil because it will allow me to use an extra coil. That's how Tesla got 112 feet long discharges. He got 50kv and increased it to 412kv or so with a Tesla Coil then the extra coil multiplied it by a factor of 30 or so.

With a coil of small diameter and great turns it is impractical.

I fired up my coil two days ago with a multigap spark gap. Very poor results as I don't have the capacitors needed to attain resonance. it was a 2 to 20 turn system. Got one inch discharges to ground.

I am rebuilding it to be 125khz now to utilise the caps I have. It will have 20 to 200 ratio with 0.25mm magnet wire.

This will not allow me to use an extra coil though. I need a few hundred metres of coax and a coil form of atleast 1m diameter.

Anyhow I will build this one and tune it and then build a larger coil form. I got the feedback system to work using a Armstrong oscillator so it's doable as a VTTC.

I mainly want to test whether Eric's calculation work and if it will tune at the frequency he calculates. But with a low frequency coil his calculations come closer to JavaTC (81khz verses 125khz).

I don't understand the criticism of solenoid coils. I have got 50cm discharges CW out of a secondary with a 19.5cm wound length.

Oh well I will put his system to the test.

-speakerbox
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Old 11-13-2014, 12:50 AM
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Quote:
Originally Posted by speakerbox View Post
As for the extra coil. I am attracted to this idea of a low turns Tesla Coil because it will allow me to use an extra coil. That's how Tesla got 112 feet long discharges. He got 50kv and increased it to 412kv or so with a Tesla Coil then the extra coil multiplied it by a factor of 30 or so.

With a coil of small diameter and great turns it is impractical.
Size and frequency is not relevant (to that).

e = iZ

Or

V = IR

Z = square root of L/C

So once again, size and frequency is not relevant.

Tesla Magnifying Transmitter/Eric Dollard Type Coils Compendium

Eric's design is not an exact replica of Tesla's coil, it's slightly modified. If you want to scale that then you will have to refer to CS Notes or use Eric's analysis in the link above. LC ratios will scale, because it's a ratio. Keep it constant. 1:2 = 5:10
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Old 11-14-2014, 12:22 AM
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Sputins Sputins is offline
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Quote:
Originally Posted by speakerbox View Post
Dear Sputins,
I live in Broome, WA.

As for the extra coil. I am attracted to this idea of a low turns Tesla Coil because it will allow me to use an extra coil. That's how Tesla got 112 feet long discharges. He got 50kv and increased it to 412kv or so with a Tesla Coil then the extra coil multiplied it by a factor of 30 or so.

With a coil of small diameter and great turns it is impractical.

I fired up my coil two days ago with a multigap spark gap. Very poor results as I don't have the capacitors needed to attain resonance. it was a 2 to 20 turn system. Got one inch discharges to ground.

I am rebuilding it to be 125khz now to utilise the caps I have. It will have 20 to 200 ratio with 0.25mm magnet wire.

This will not allow me to use an extra coil though. I need a few hundred metres of coax and a coil form of atleast 1m diameter.

Anyhow I will build this one and tune it and then build a larger coil form. I got the feedback system to work using a Armstrong oscillator so it's doable as a VTTC.

I mainly want to test whether Eric's calculation work and if it will tune at the frequency he calculates. But with a low frequency coil his calculations come closer to JavaTC (81khz verses 125khz).

I don't understand the criticism of solenoid coils. I have got 50cm discharges CW out of a secondary with a 19.5cm wound length.

Oh well I will put his system to the test.

-speakerbox
Okay wow Broome! It’s one of the most remote, arid yet beautiful coastal locations on Earth. (Or so it’s said, I haven’t been there as yet. - One day a family holiday / fishing trip is in order, but then I won’t want to leave).

I shouldn’t think you’ll have too many inspectors knocking on the door concerned about your coils up there, although hams world-wide can still detect transmissions if operating on their frequencies.
It would be nice to see pictures of your Armstrong oscillator and coil setup when its ready.

Study the material from Eric, Dr-Green & Jpolakow. The coils are built with minimal dielectric material, (Ie no PVC or cardboard pipes), they are built to certain aspect ratios and certain space windings. It all about the combined electrical speed of propagation, not necessarily the length of the spark, but its the quality and propagation. It’s also about the displacement current aspect.
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Old 11-14-2014, 04:22 AM
speakerbox speakerbox is offline
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Dear Sputins,
Yes it is a beautiful spot!

I finished the coil last night at tuned it to 128khz and 80khz.

The JavaTC and Dollard calculated frequencies.

The output was very poor and I don't see much point in further building or experimenting.

From experience I see two problems:
1. magnetic flux density is too low and coupling too loose due to the size of the primary.
2. primary and secondary coupling is too low due to coil arrangements
3. design requirements are nonsensical and stringent

I am not a engineer, these are my personal opinions I give as explanation why I am discontinuing my efforts.

I will go back to tube coils and try a bipolar arrangement or two coils 180 degrees out of phase.

Anyhow I gave it a go and it's time to move on.

I didn't witness any strange phenomenon and cranked the power past 2kw. The rf was higher than a normal TC but the dielectric field was weak.

I have produced very powerful dielectric fields and fractal like gas discharges with a tube coil as seen here: crazy rf from tesla coil - YouTube

Good luck to all.

-Wil
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Old 11-15-2014, 03:16 PM
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Spreadsheet Version #1

I hope this set of Erics parameters show the clear minded design that Eric has given us. These sizes are whats been stated in all the pages presented so far.

I adapted this spreadsheet from my large coil project I did in 2012, the spreadsheet design worked great. I never needed to use any Tesla Coil program as I was not looking for a sparking coil based on RF, but a transmission coil based on non radiative principals(Tesla Longitudinal Wave). The unit I built worked as designed, I detuned the top load just enough to get 3ft streamers from a 1 kw power source, it also gave very nice glow with no discharges as I tuned it to finally give no sparks and only a slight glow indicating high efficiency. The reason to detune the top load was to see how much charge was being stored, thus a breakout would indicate this, where proper tuning would eliminate any such sparks, which is the CORRECT way of understanding the TMT Coil. The coil I made was not based on Eric design sizes but as you can see I used Erics directives to get the correct ratios and parameters. I will release the spreadsheet as soon as I finalize version #4. I hope this helps, regards Arto.

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Old 11-17-2014, 02:50 AM
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Quote:
Originally Posted by speakerbox View Post
I finished the coil last night at tuned it to 128khz and 80khz.

The JavaTC and Dollard calculated frequencies.

The output was very poor and I don't see much point in further building or experimenting.
What did you tune to 80 kc? To work properly at that frequency you will need a secondary coil that's about 7 metres diameter. You should expect poor performance from a 50cm diameter coil.

Quote:
Originally Posted by speakerbox View Post
From experience I see two problems:
1. magnetic flux density is too low and coupling too loose due to the size of the primary.
2. primary and secondary coupling is too low due to coil arrangements
3. design requirements are nonsensical and stringent

I am not a engineer, these are my personal opinions I give as explanation why I am discontinuing my efforts.
It's based on Tesla's design. Apparently it worked just fine at Colorado Springs. Might I suggest that the problem is your own.

Tesla Magnifying Transmitter - Colorado Springs Scale Model 1860 kc - Single Wire & Wireless Light - YouTube
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Old 11-17-2014, 05:22 AM
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Sparks aint sparks

Quote:
Originally Posted by speakerbox View Post
Dear Sputins,
Yes it is a beautiful spot!

I finished the coil last night at tuned it to 128khz and 80khz.

The JavaTC and Dollard calculated frequencies.

The output was very poor and I don't see much point in further building or experimenting.

From experience I see two problems:
1. magnetic flux density is too low and coupling too loose due to the size of the primary.
2. primary and secondary coupling is too low due to coil arrangements
3. design requirements are nonsensical and stringent

I am not a engineer, these are my personal opinions I give as explanation why I am discontinuing my efforts.

I will go back to tube coils and try a bipolar arrangement or two coils 180 degrees out of phase.

Anyhow I gave it a go and it's time to move on.

I didn't witness any strange phenomenon and cranked the power past 2kw. The rf was higher than a normal TC but the dielectric field was weak.

I have produced very powerful dielectric fields and fractal like gas discharges with a tube coil as seen here: crazy rf from tesla coil - YouTube

Good luck to all.

-Wil
It seems from your videos that you generally have the technical ability to build high power electrical apparatus. -Although I don’t see how you can dismiss the given coil design and criteria so readily.

So what is it that you actually want to achieve with a tesla coil arrangement??

If you only want a big spark generator, then build solenoid coils. The guys from TCBOR (Tesla Coil builders of Richmond) are a good source of information on this. (I have 52Gb of material from them – 120hours). Their sparking type TMT coils can produce spark lengths 5 times the coil length. (been there, done that). It looks good, it’s fun, makes lots of ozone, RF, blocks local TV reception but otherwise it’s fairly useless..

Once you’re sick of making big sparks and want to learn what Tesla coils are really all about (communication / transmission of power devices and other possibilities) then turn towards the Dollard / TESLA design parameters and mode of operation. Although, if made and tuned correctly and pushing 2KW of power, you should see some fractal like discharges.

I’d be more impressed with a 10cm fractal spark discharge (into Counterspace, like Dollards photo previously given) than a 100cm discharge of the normal variety type sparks from given from a solenoid VTTC or spark gap coil.
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Old 11-17-2014, 04:01 PM
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Once you’re sick of making big sparks and want to learn what Tesla coils are really all about... then turn towards the Dollard / TESLA design parameters
Yes, and not one minute sooner. Toys belong in the playground, and flashing lights belong in the fairground. Here they fulfil their intended purpose beyond expectation. The stuff that actually matters happens in the physics lab.
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Old 11-26-2014, 12:05 AM
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Version #2

Here is an updated version, Just a lot of work to refine each part, please note the PHI ratio's that appear in the areas and volumes. Enjoy.

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Old 12-02-2014, 01:26 AM
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Magnifying Transmitter experiments

i feel i owe a great deal to Eric Dollard, and although he would snarl at my resonator i wanted to share my recent stuff...

Gonna do another vid soon with updated schematic
(Part 9 will show the basic circuit on 1.2v) This vid is 12 v

pt 15 TMT Magnifying Transmitter, Toroid, Filter, 3 mA Current draw
https://www.youtube.com/watch?v=SvsOrFpbK68
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Old 12-02-2014, 11:17 PM
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Quote:
Originally Posted by mr.clean View Post
i feel i owe a great deal to Eric Dollard, and although he would snarl at my resonator i wanted to share my recent stuff...

Gonna do another vid soon with updated schematic
(Part 9 will show the basic circuit on 1.2v) This vid is 12 v

pt 15 TMT Magnifying Transmitter, Toroid, Filter, 3 mA Current draw
https://www.youtube.com/watch?v=SvsOrFpbK68
Yeah, the T-rex would snarl and your resonator and the use of cardboard tubes.

I watched a few of your TMT videos etc. and you’ve got some interesting results going on nevertheless. I also now understand the camo. (Unfortunately airsoft is banned here in Oz).

Please do post a clear schematic of the resonator. For some it would be helpful and make it do-able for the electronics type people who want try experimenting with some coils of this type, using lower voltages etc. (Rather than the need for vacuum tubes and associated equipment or other HV transformers & spark gaps etc.).

Sure, T-rex would say use a vacuum tube CW or modulated AM driver and with the optimum pri/sec/extra coil ratios and windings. – Which is certainly true. One other conclusion is that the backyard / garage experimenter just needs to build something to get started, no matter what form it actually takes (given at least some of the basic T-rex parameters). Some reasonable results will still be achieved and just as important, the concepts become clear.
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Old 08-24-2015, 01:46 AM
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tarakan tarakan is offline
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I am interested in this coil design myself.
Publish it please.
What kind of circuit drives the primary in this case?

I am considering building a Tesla Coil of a standard type with a PLL drive and comparing the designs in their qualities.

I was always wondering why artillery barrels are machined in steps on the outside rather than as a single tapered conical surface.
Maybe same mathematics applies to Tesla - Dollard coil designs.

I can see how a transformer with multiple stages can cause constructive interference (being a set of resonators) that in turn cause very large voltage multiplication.

What hobbyists consider a Tesla Transformer is not quite the true Tesla Transformer as I found out in my previous research.

Thank you.
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Old 08-24-2015, 04:57 AM
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tarakan tarakan is offline
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Yeah, the T-rex would snarl and your resonator and the use of cardboard tubes.

I watched a few of your TMT videos etc. and you’ve got some interesting results going on nevertheless. I also now understand the camo. (Unfortunately airsoft is banned here in Oz).

Please do post a clear schematic of the resonator. For some it would be helpful and make it do-able for the electronics type people who want try experimenting with some coils of this type, using lower voltages etc. (Rather than the need for vacuum tubes and associated equipment or other HV transformers & spark gaps etc.).

Sure, T-rex would say use a vacuum tube CW or modulated AM driver and with the optimum pri/sec/extra coil ratios and windings. – Which is certainly true. One other conclusion is that the backyard / garage experimenter just needs to build something to get started, no matter what form it actually takes (given at least some of the basic T-rex parameters). Some reasonable results will still be achieved and just as important, the concepts become clear.
The video wasn't so eloquently narrated, but the experiment seems interesting. I would like to have a schematic of everything depicted in the video to repeat it. Thank you.

https://www.youtube.com/watch?v=4JDBYKX5CcU
This video is interesting. How much power does it draw compared to how much power it appears to spend on keeping the diodes lit up?

I have used the diode halfbridge in experiments of single wire power transmission. It is an interesting concept. The so-called Avramenko Fork.
Thank you for the video!
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Old 08-26-2015, 01:46 AM
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Where can I find the excel table that was made by Arto Heino?

I would like to get my hands on an excel table with Eric Dollard formulas in order to compare Tesla Coils in their dimensions before I wind them.
I am also considering building a winding lathe.
I need dimensions of the coils that I am winding to build a winding lathe and not to waste any money and time on rebuilding it. Thank you.

There is another interesting Donald Smith experiment with 7 Tesla Transformers that I want to perform. This is where the need for a lathe comes in.
I want to see how N-number of receiver coils take power out of a transmitting coil. I want to see if the relationship is linear or if there are some effects worth noting.

I want to make a standard Tesla Transformer and an Eric Dollard version and see the difference in their operation.

Thank you.
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Old 08-27-2015, 06:43 PM
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You may consider joining the Tesla Coil Mailing List. These guys are very sharp and might be able to have some interesting dialogues regarding this. I think it would be good to collaborate at least on the topic.
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Old 08-29-2015, 01:49 AM
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You may consider joining the Tesla Coil Mailing List. These guys are very sharp and might be able to have some interesting dialogues regarding this. I think it would be good to collaborate at least on the topic.
Why can't we discuss this here on the forum?

I want to make a small Eric Dollard Tesla coil. As I understand that those devices are powered from traditional "Tesla Coils" or other High Voltage transformers.
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Old 08-29-2015, 02:27 AM
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What kind of circuit drives the primary in this case?
A regular signal generator off ebay etc will do, then you can amplify the signal to increase the power as needed.
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Old 08-29-2015, 05:30 AM
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Amplifier would by the place where I would get stuck for Dollard experiments.
I am not very strong in electronics. I can build other people's circuits. I dont have much money either.

RF amplifiers are quite hard to build. Can I use a tunable Tesla Coil instead?
I maybe will build my Dollard projects to match the frequency of the Tesla Coil or adjust both to find a good compromise.
I am building a PLL SS Tesla Coil right now.

I have access to a CNC milling machine for cutting sheets. Maybe I can make Eric Dollard-based science kits and help out Eric Dollards reserach.
Maybe he will open his Free Energy secrets to me for that. But right now I am being realistic with what I can handle...
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Old 08-29-2015, 02:53 PM
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Why can't we discuss this here on the forum?

I want to make a small Eric Dollard Tesla coil. As I understand that those devices are powered from traditional "Tesla Coils" or other High Voltage transformers.
My intention wasn't to preclude your discussing of this here on this forum, but rather open it up to have further discussion amongst a group that has perhaps much more experience building Tesla Coils and therefore able to help you perhaps more rapidly.

You mention that you are not very strong in electronics at the moment and I think that you might perhaps get additional details that would help you to build one, on the cheap, and from scratch. I know that there are some folks there that are willing to mentor those interested in such endeavors and it could prove useful.
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Old 08-30-2015, 02:39 AM
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Originally Posted by tarakan View Post
Amplifier would by the place where I would get stuck for Dollard experiments.
I am not very strong in electronics. I can build other people's circuits. I dont have much money either.

RF amplifiers are quite hard to build. Can I use a tunable Tesla Coil instead?
I maybe will build my Dollard projects to match the frequency of the Tesla Coil or adjust both to find a good compromise.
I am building a PLL SS Tesla Coil right now.

I have access to a CNC milling machine for cutting sheets. Maybe I can make Eric Dollard-based science kits and help out Eric Dollards reserach.
Maybe he will open his Free Energy secrets to me for that. But right now I am being realistic with what I can handle...
An RF amplifier is basically the same as an audio amplifier. The main thing to watch out for is the speed (slew rate) of the components. You should google class A, class AB amplifiers, and op amps. Also there are amplifier circuits given in the ARRL Radio Amateur's Handbook, and typical/example circuits in component datasheets.

This program can also introduce you to class A amplifiers but you will have to pay attention to transistor slew rates or you may find a perfectly assembled circuit not doing anything whatsoever TransistorAmp circuit design software for bipolar transistor amplifiers

If you don't have an oscilloscope I'd recommend remembering that before hair starts getting pulled out. Although to actually understand what you're doing the ARRL handbook is most recommended.

The coil can be tuned to a certain extent but the whole point is to design it to work at a particular frequency and to optimise the design through getting the best performance out of it. The oscillator is tuned to the resonant frequency of the coil, the coil isn't tuned to a fixed oscillator frequency. Although it can be, it won't be working at its best. Also the more you stray from the coil's natural tuning the more difficult it will become to find the new resonant frequency.

Investing in a relatively decent signal generator will save a lot of frustration and will display the exact frequency on the screen. Something like this supplies enough power to light small filament bulbs without power amplification

12MHz Dual Channel DDS Function Signal Generator Sine Square Wave Sweep Counter | eBay
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Last edited by dR-Green; 08-30-2015 at 02:59 AM.
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