Eric Dollard Style Tesla Coil Verses Standard Tesla Coil

[dR-Green]

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.

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

[Sputins]

Sparks aint sparks

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

[dR-Green]

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.

[artoj]

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.

[mr.clean]

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

[Sputins]

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

[tarakan]

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.

[tarakan]

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!

[tarakan]

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.

[trahedron]

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.

[tarakan]

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.

[dR-Green]

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.

[tarakan]

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...

[trahedron]

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.

[dR-Green]

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