Tesla Resonant Transformer

[Ernst]

When really beautiful coils are needed, go to dR-Green!

What is the bright light on the 3rd last image on top of the extra coil?
Is that the primary capacitor 17 and 18 images from the bottom (if I'm correct) between two yellow wires.
Is the bowl on top not connected?

Just some questions...

Ernst.

[Jeff Pearson]

Dr-Green please explain the photo just before the bowls. Looks like more than primary capacitor. Beautiful work.

[dR-Green]

When really beautiful coils are needed, go to dR-Green!

What is the bright light on the 3rd last image on top of the extra coil?
Is that the primary capacitor 17 and 18 images from the bottom (if I'm correct) between two yellow wires.
Is the bowl on top not connected?

Just some questions...

Ernst.

Thank you Ernst! The picture with the light is (almost) a recreation of this, except my extra coil is connected to the top of the secondary



I'm not sure which images you mean, I've edited the posts to number the images to make it a bit easier to navigate, and I'll add more info if I get a chance tomorrow. The bowl is connected to the extra coil via the copper pipe so the whole thing makes up the capacitance terminal, it can be tuned by changing the bowl size, and finer tuning through adjusting the pipe length. 22mm diameter straight copper pipe connectors and end caps make it easy for connecting and disconnecting pieces.

Dr-Green please explain the photo just before the bowls. Looks like more than primary capacitor. Beautiful work.

Thank you too Jeff. That's the tuning condenser for the secondary coil. A wire goes from the top of the secondary to a nut, which supports a bolt with a plate on one end of it. The other plate is connected to the secondary ground end, so the capacitance/gap distance is adjusted through screwing the bolt in or out. It's my alternative to the condenser rings suggested by Eric in the CRI notes because fine tuning those can get a bit tricky.



Happy new year!

[Ernst]

Really nice work!
You answered my other question by answering Jeff.
But I have a new one .
I saw you made 2 systems. The picture where the light is lit, are you powering that system or the other one?


Ernst.

[dR-Green]

The one with the lit bulb is being powered as the transmitter, along the same lines as Tesla's experiments at Colorado Springs. I use the bulbs as some sort of indication as to how much power is there compared to the output from the receiver and that sort of stuff. Plus it's always fun to light filament bulbs in open circuits

A bulb in the same position on the receiver would be an interesting comparison, haven't tried that.

[Kokomoj0]

Thank you Ernst! The picture with the light is (almost) a recreation of this, except my extra coil is connected to the top of the secondary

what I find odd is that picture of teslas coil does not match the schematic shown. the coil itself is built to have a 'distributed (wire to wire) series capacitance' the schematic for some weird reason shows a parallel capacitance which of course yield completely different results.

[Kokomoj0]

Can anyone help explain to me how one shifts the receiver coil phase by 90 degrees?

"Shifting the phase in the receiver Tesla coil by 90 degrees allows for REAL power to be demonstrated once again at the receiver end, allowing for the lighting of lamps and running motors, etc".

By changing some or many physical characteristics of the coil.

in a receiver you are not changing the coil itself you are changing the system 'tank' frequency.

A good demonstration of resonance:

Kundts Tube resonance - YouTube

another one demonstrating nodes with fixed frequency

Resonance tube demonstration - YouTube

[Sputins]

It's the extra coil

what I find odd is that picture of teslas coil does not match the schematic shown. the coil itself is built to have a 'distributed (wire to wire) series capacitance' the schematic for some weird reason shows a parallel capacitance which of course yield completely different results.

It’s not odd at all... That’s because “that picture” is of the extra coil, not the secondary coil (where the schematic shows the capacitor).

The secondary and primary coils are located within the giant ring around the extra coil. In that photo you can see this faintly in the background.

[dR-Green]

It’s not odd at all... That’s because “that picture” is of the extra coil, not the secondary coil (where the schematic shows the capacitor).

The secondary and primary coils are located within the giant ring around the extra coil. In that photo you can see this faintly in the background.

Yes, and if you read CS Notes then you will find that said condenser is used for tuning the secondary and consists of a metal plate and a 36 inch diameter copper sphere or some such contrivance.

The picture is meant to show what the description beneath it says.

[Kokomoj0]

It’s not odd at all... That’s because “that picture” is of the extra coil, not the secondary coil (where the schematic shows the capacitor).

The secondary and primary coils are located within the giant ring around the extra coil. In that photo you can see this faintly in the background.

oh I thought that was the secondary

it looks like there is a one inch spacing, due to arc over or distributed capacitance?

[Kokomoj0]

I always assumed the reason for the spacing in teslas coil was to create and operate it as a 'self resonant coil' so a tiny little tickle would set it into severe self oscillation. I expect it would build incredible currents?

A coil can be best seen as a helical waveguide with a kind of helical surface wave propagating along it. The phase propagation velocity of such a helical waveguide is dispersive, meaning it is different for different frequencies. (This is not the case with ordinary transmission lines like coax or open wire.) Lower frequencies propagate slower along a coil. The actual phase velocity at a specific frequency for a specific wave mode is obtained by solving a transcendental eigenvalue equation involving modified Bessel functions of the first (In) and second kind (Kn) for, respectively, the inside and the outside of the helix.[1,8]

RF Inductance Calculator

Spherical Capacitor

http://web.mit.edu/viz/EM/visualizations/coursenotes/modules/guide05.pdf