Tesla's Magnifying Transmitter "Replications"

[dR-Green]

Thanks mr.clean

but I really think there are precise guidelines for the Extra coil

Yes, there are. But those aren't necessarily based on physical characteristics or appearance, the thing also has electrical characteristics. When you scale down the physical properties the electrical characteristics don't scale down by the same ratio, so the exact physical proportions have little meaning beyond the original design if you intend to make a smaller version. At Colorado Springs the extra coil was optimised on the basis of its inductive relationship with the secondary, which gave those results. If you scale it down physically then you will not have the same relationship and you won't get the same results I.E. not optimised and a different end frequency etc.

The Colorado Transformer can be scaled to the broadcast band. Important is that the inductance of the extra coil decrease with the square root of the increase in scaled frequency. Also any lumped capacity must also decrease with the square root of the increase in frequency.

A 15 meter coil at 45 Kc/sec is a .75 meter coil at 900 Kc/sec.

A 25 milliHenry coil at 45 Kc/sec is a 5.6 milliHenry coil at 900 Kc/sec.

A 432 picoFarad terminal capacitance is a 97 picoFarad capacitance at 900 Kc/sec.

45 over 900 is .05 and the square root of .05 is .22. Take it from there.

[mr.clean]

Thanks mr.clean



Yes, there are. But those aren't necessarily based on physical characteristics or appearance, the thing also has electrical characteristics. When you scale down the physical properties the electrical characteristics don't scale down by the same ratio, so the exact physical proportions have little meaning beyond the original design if you intend to make a smaller version. At Colorado Springs the extra coil was optimised on the basis of its inductive relationship with the secondary, which gave those results. If you scale it down physically then you will not have the same relationship and you won't get the same results I.E. not optimised and a different end frequency etc.

Ok I get ya, yes im going by the patent, other large builds and basic intuition,

I plan on making a vertical type mono polar TMT, slightly larger than the average table top TC, I guess about like yours.

also tho I plan to extend the Don Smith bipolar setup, and add Extra coils to each end, as Eric Dollard's picture from the 80's

im also quite convinced that Kapanadze's device is a TMT in bull-pup form

[mr.clean]

hi mr Green, from seeing old post now, you clearly do understand, im new here

[mr.clean]

This is my latest creation, a small "test coil" using Eric Dollard's calculations for 3.67MHz, approx 1/72.4 scale. 2 turns 20.7cm primary, 20 turns same diameter secondary, 126 turns 8.28cm diameter extra coil. Built out of 6mm and 12mm MDF with 9mm hardwood dowels, no insulating work done on the frame at all. Had to use 26 SWG wire which presented problems in the secondary in the way of easily bending and the coil becoming a slight octagon resulting in about 15cm of wire left over. The extra coil wire length worked out perfectly, but the whole thing being so small it's impossible to space the wire evenly. Space has been left above and below the secondary allowing for primary coupling adjustment and condenser rings adjustment at the top. The extra coil is supported by a 20mm PVC conduit with a tight fit for adjustment, with provisions having been made for dowel legs/supports (the four small holes).

Pics at various stages of construction:













In use:



Top of extra coil:







Arcing into a piece of pine:





To be continued due to max image limitation...

hello again, just a question, are you seeing results improved, unlike any regular 2 coil resonance?

ive got some tuff put together, and i definitely have some intensity in the Extra coil, i dont have much to compare to tho, just curious if you noticed a big difference?

[Ecancanvas]

Mr clean

Mr clean, if you dont have this paper by eric Dollard "condensed intro to tesla transformers" you should read it. it will help answer your questions. i tried to upload, didn't work.

[mr.clean]

Mr clean, if you dont have this paper by eric Dollard "condensed intro to tesla transformers" you should read it. it will help answer your questions. i tried to upload, didn't work.

i think i saved it a while ago, then just kept looking when maybe i have it already lol

thanks

[mr.clean]

hi all just up late winding coils, here is my work so far on the Magnifying Transmitter, looking good, 7.4vRms input, 8.85v across bulb (burns out LEDs, thought it broke lol then replaced LED and was BRIGHT again, whew)

anyway, dont worry, this is for driving real bulbs (halogens, incandescents) but im just tuning right now. there are MANY particulars, but i tuned it for max brightness, then connected the Resonator / "extra coil" and massively intensified
Power is taken from the base of the secondary and ground, as you know

Imageshack - imagetwy.jpg

[mr.clean]

TMT tuning vid

hi all, just a quick update

TMT: Tesla Magnifying Transmitter (Pat #1,119,732) - YouTube

[mr.clean]

hi all just another update

Receiving coil

https://www.youtube.com/watch?v=4PBxDx-DINI

[mr.clean]

me again, part 5: Colorado Springs Model
TMT 5 : Tesla Magnifier: Colorado Springs Model - YouTube

*Tuned for 503.4kHz*

L1 5 turn 22" diameter 14 gauge

39.98uH and 2.5 nF tank circuit

L2 31 turn 22" diameter 24 gauge

930 uH and 48pF self capacitance 2141" wire length

L3 165 turn 4.13" diameter 24 gauge 4.13" tall

1888.1uH and 4.8 pF self capacitance 2141" wire length
(sec and extra coil equal lengths, both 1/4 resonators?)

Top load Capacitance 25 cans = approx 47.2 pF

sec self capacitance almost exactly equals extra coil topload capacitance, interesting, maybe coincidence

[Farmhand]

Calculators.

Here's a few more calculators and converter to help with stuff.

Rough "Quality" Factor calculator.

Converter for Resistance - Capacitance and Inductance at the bottom, this one is needed for the one above.

Khz to Ghz converter also useful to reduce errors. I make plenty. This one is also useful for the "Q" calculator.

This calculator below can help us design our Primary coil and get a good estimate of
the capacitance needed, with some tinkering, to use this calculator with a
three coil transformer takes some messing about.

It can also show us the expected propagation velocity based on the length of
wire and the frequency it gives.
OLTC Calculator

Like the pic below the Wave Length calculator says 1260 Khz for about 60 meters of wire
but the coil calculator says 1868.8 Khz for about the same wire that is a
propagation velocity increase over light speed calculations of 1.4 times. What a coincidence,
play with the Height and Diameter and the calculator will tell you all you need to know. I pointed this out a long time ago.


This is a Frequency Wavelength Calculator..

THis calculator tells us the Raw LC frequency of the inductance and capacitance if we know it accurately.
L/C Resonance Calculator

And this is a Copper Wire properties info chart.

Cheers.

[mr.clean]

Here's a few more calculators and converter to help with stuff.

Rough "Quality" Factor calculator.

Converter for Resistance - Capacitance and Inductance at the bottom, this one is needed for the one above.

Khz to Ghz converter also useful to reduce errors. I make plenty. This one is also useful for the "Q" calculator.

This calculator below can help us design our Primary coil and get a good estimate of
the capacitance needed, with some tinkering, to use this calculator with a
three coil transformer takes some messing about.

It can also show us the expected propagation velocity based on the length of
wire and the frequency it gives.
OLTC Calculator

Like the pic below the Wave Length calculator says 1260 Khz for about 60 meters of wire
but the coil calculator says 1868.8 Khz for about the same wire that is a
propagation velocity increase over light speed calculations of 1.4 times. What a coincidence,
play with the Height and Diameter and the calculator will tell you all you need to know. I pointed this out a long time ago.


This is a Frequency Wavelength Calculator..

THis calculator tells us the Raw LC frequency of the inductance and capacitance if we know it accurately.
L/C Resonance Calculator

And this is a Copper Wire properties info chart.

Cheers.

that's excellent info man thanks,

and I saw your other response on the DS thread, much appreciated

I will try the calculators and techniques you have suggested and get back

[Farmhand]

Keep doing your own thing, your doing great ! I just wanted to list the
calculators together for easy reference. GO with your intuition, the transformer
will speak to you and tell you what it wants to do. But you have to get
intimate with it to decipher it's code, and I think you are with yours.
It'll fill your thoughts and expand your mind.

Can't wait to see your rotary gap working. Are you using a charging circuit in
the last stage of the primary HV supply ?

With the OLTC calculator, what I do is measure the total inductance and
capacitance of my secondary-extra coils combined, then formulate a secondary
solenoid kind of halfway in H x D but using the full wire amount and ending up
with about the same calculated frequency as mine tests on the function
generator, it takes some tinkering but ends up being very useful for making
changes once one is "used" to the tinkering of the calculator method.

I'll get my coil specs and post them here when I get time, busy fighting a health
problem, but I'm winning.

Cheers

[mr.clean]

Keep doing your own thing, your doing great ! I just wanted to list the
calculators together for easy reference. GO with your intuition, the transformer
will speak to you and tell you what it wants to do. But you have to get
intimate with it to decipher it's code, and I think you are with yours.
It'll fill your thoughts and expand your mind.

Can't wait to see your rotary gap working. Are you using a charging circuit in
the last stage of the primary HV supply ?

With the OLTC calculator, what I do is measure the total inductance and
capacitance of my secondary-extra coils combined, then formulate a secondary
solenoid kind of halfway in H x D but using the full wire amount and ending up
with about the same calculated frequency as mine tests on the function
generator, it takes some tinkering but ends up being very useful for making
changes once one is "used" to the tinkering of the calculator method.

I'll get my coil specs and post them here when I get time, busy fighting a health
problem, but I'm winning.

Cheers

wow that's excellent insight, and i do have a better feel for the coils and the proportions from these recent experiments

i will add more sophisticated components when i go back to DC source, but right now there's nothing fancy as seen in the schematic in the vid, i am still probably losing efficiency from not having any resistive or inductive ballasting, but nothing is heating much right now so im trying to find what the parameters are and push it, then see what needs to be improved.

for the rotary gap, i am going to use acrylic with 6 electrodes, but to be more precise im going to basically copy the rotary device shown by clagwell on you tube

Rotary Spark Gap (Angle Grinder) - YouTube

and his results...
Magnifier Driven Tesla Coil - YouTube

i hope your health gets better soon !!

[mr.clean]

another update here, trying larger and less lossy driver coils, and while staying in the guidelines of Tesla and Dollard, i am studying other large modern true Magnifier designs of Richard Hull, Ed Wingate, and others.

best performance so far, with least amount of turns, and the resonator here is virtually separate from the inductive action of the primary

TMT 6 Tesla Magnifier: New Master Oscillator and Resonator - YouTube