As I recall Meyl started a Tesla revival in the black forest early 2000
One project studied a geo wave. From that community he made the small
pancake demo for medical/bio use. The suitcase. The output less than a watt.
He became concerned about the safe use of radio waves over 800 Mhz.

I also found example project for review that uses the FDPF16N50 mosfet. the end use for same goals.
However the E class cascode amplifier design was abandoned. Need a more thorough study of possible
options on the exciter. Some of the MOT (microwave oven transformer) MO capacitors work ok.
2.2 kW 3 800 W MOTs in 3 phase.

datasheet
http://www.onsemi.com/pub/Collateral/FDPF16N50T-D.pdf

pictures, schematic, parts, board and assembly directions.
Solid State Tesla Coil – Sean Soleyman

I think you could expect step up / wireless transfer/ and step down but not over unity for a standard appliance.
For example a standard refrigerator requires 2200 starting wattage with a 700 running wattage,
so you would need at least 2200 watt maximum output or 1500 watt storage such as flywheel or capacitor
for starting and 700 watt intermittent.

Other smaller and popular ss exciters claim 92% efficiency such as the pnp-npn exciter (complementary astable multivibrator)
Ruhmkorff coil, Ignition coil, Tesla coil, Flyback converter, SEC exciter, Slayer exciter

Good day,
Thank you sir for answering. I will build this amplifier as soon as possible.
Maybe others who have experimented with this system can share their experiences.

Nice work!

Meyl is spreading false information so I would recommend never listening to anything he has to say again. You don't need to know anything that Meyl talks about in order to make Tesla's system work, if you do listen to him then your understanding will be wrong.

The transmission has absolutely nothing to do with the capacitance terminals. The reason it doesn't work when you disconnect the ground wire is because the transmission is 100% going through that wire.

It's possible to transmit some energy without the wire when the coils are close enough, but the usual inverse square law applies. The capacitance terminals and the design of the whole thing is intended to SUPPRESS radiation. It's the exact opposite principle of a normal radio antenna/radiator, which is designed to radiate as much energy as possible. Long thin lengths of wire/conductor radiate energy efficiently, metal spheres do not.

Likewise, the reason why Meyl's coils continue to work when he's "shielding" it is precisely because the energy is going through the wire so he's not shielding anything. He's giving a totally false description of what's happening.

As for an amplifier, designing one that works with sine waves isn't a small task, so a class AB balanced amplifier is easiest in that respect.

https://www.electronics-tutorials.ws...amplifier.html

Op amps are easy and good up to a certain point but they're mainly intended for low power and low voltage - 1.5 amps is considered high power and you won't find many op amps that will output more than that. But you can look in to bootstrapping to get them to work with higher voltages.

Square waves are easier to work with so if the output impedance of the amplifier doesn't matter then you can simply connect one side of the primary to the + of the power supply, connect the other end of the coil to the (NPN) transistor collector, emitter to - and trigger the base from your signal generator.

You can also add amplifiers in stages, for example you can use a low power preamp to boost the signal to a level that will drive the high power amplifier stage.

The output frequency of the coil will be the same frequency as the signal generator which you use to drive the whole thing in the first place, or the signal at any point in the amplification chain. Otherwise you can hang a probe in the air near the coil and see it on an oscilloscope.

On a side note LEDs aren't particularly ideal as test loads. Try small incandescent bulbs like these

https://www.ebay.co.uk/itm/Qty-25-3m...p/120843266351

I agree that starting with an stable oscillator and progress a design through stages while eliminating problems at each stage. The final stage having the natural impedance that Max Plank discussed being excess magnetic or electrostatic field,admittance.

I'm also interested in amplifier for power output of sinewave. Class AB looks nice but I have a question : would it work for low frequencies too ? can I attach a diode bridge to get rectified power sinewave ?
Sorry for offtopic.

There's no difference between an audio frequency amplifier and a radio frequency amplifier, the basic approach is exactly the same. Where frequency matters is in your component selection - are the transistors fast enough and will the input and output coupling capacitors allow the frequency you want through. If the capacitors are too small then they'll block the low frequency so nothing will go in or out of the amplifier, otherwise the basic approach works in all situations and at all frequencies.

If you put a rectifier on the output then it will be the same as any regular AC power supply or signal source being rectified to DC. You won't get a sine wave but half wave pulses. However, the amplified AC output is essentially just a varying DC voltage signal. For example if you used a class A amplifier with 12V power supply and input a sine wave, you'll have a DC output where the voltage is oscillating between 0V and 12V DC in a sine wave pattern.

I made a typo that is misleading about Planck natural impedance. It does not have excess magnetic and the natural admittance does mot have excess dielectric.
The ratio not being ideal might be the most common loss mistakes in our transmission design.

I recommend a book by Doug Demaw, WF1B's QRP Notebook.
Also Dr. Ron Stiffler's ideas have greatly improved wave shape and output.
Design, parts choice, construction, parts layout are just as important for audio.
One famous design that HP is famous for was it's precision.
https://www.radiomuseum.org/forum/si...?language_id=4

John Bedini also designed audio.

Having a variable signal source is nice but a dedicated signal source has a
more finite control over a narrow range. Why jump to transmission loss
you may ask. Between the stages heavy loss can occur and network analyzers are expensive.
https://youtu.be/M1PgCOTDjvI

There are other advantages in working with small signals and switching rapidly using diodes.
The push pull aspect might be an advantage in moving abrupt waves and crystal type stability.
It is a challenge to use solid state at high voltages. The variable wide range design gets in the way.
This reason I think slayer tesla coil was interesting choice not too many turns. Parallel transistors.
Better yet a modified slayer that leads up to the DrGreen tesla build. The pancake shown also interesting.

diode switching
https://youtu.be/M1PgCOTDjvI

Good day,
@dr-Green Please do not insult Dr.Meyl because he has wrong views. He also did something beneficial for us: he demonstrated that using a power amplifier and a signal generator, one can transmit electricity wirelessly just through the Aether. His demonstration is what impresses me greatly and i will reproduce it on a large scale and then naturally post it on YT platform so everybody can see it and see that it's no joke.
Now, i asked you an important question in my first post which is: if i build a mechanical oscillator with interrupter tthat rotates and the voltage to be about 50.000V or less but no less than 10kV, how do i find out the frequency of the machine since no digital multimeter works at such high voltages without a special probe? How did Dr.Tesla found out the frequency of his machines? Did he gave us the method or simply he did the calculations in his mind and he never wrote them down?

Thank you,

It's not an insult to say that Meyl is spreading false information. It's a fact. Tesla's system works like Tesla said it worked, not like Meyl says it works. He's just demonstrating single wire transmission, the aether has got nothing to do with it. Instead of a wire, Tesla was using the earth.

"The Future of the Wireless Art" by Nikola Tesla

You can put a scope probe in the air like I said, or you can calculate the frequency based on L and C.

Resonant Frequency Calculator - Tesla Scientific

I'am sure there has to be a mathematical relationship for the frequency of such an oscillator that will include as you say inductance and capacitance and also the speed and number of elements of the interrupter.

The "mechanical oscillator" as you say was just a high frequency alternator. The frequency was controlled through controlling the RPM of the alternator and calculated through knowing the RPM and number of poles, but being a physical device it could only spin so fast, so to get higher frequencies Tesla used harmonic frequencies of whatever frequency the alternator was outputting through tuning the L and C. The motor controlling the interrupter speed is tied to the speed of the alternator, or something to that effect. That's either written in the patent or in "Inventions, Researches and Writings of Nikola Tesla", details on the alternator are in the book.

Either way the frequency of the whole thing should be made to be whatever the resonant frequency of the coil is. If you have a disk with 1 pole and it rotates 60 times per second then you obviously have 60 cycles per second. Put 2 poles on it and you have 120 per second. Double the rotation speed to 120 times per second and you have 240 cycles per second.

Buddha,

By the way, dR-green knows what he’s talking about…

As far as your question, “If I build a mechanical oscillator with interrupter that rotates ‘(HV), how do I find out the frequency of the machine since no digital multimeter works at such high voltages without a special probe”?
So to answer that, assuming you mean some kind of rotary spark gap device, to determine the (frequency) make-break rate isn’t as simple as calculating the rotary segments times the rpm of the rotor. – (I assume you are taking about the spark across an air gap). The actual make-break rate could be multiple times per actual segment of your rotor, depending on the air gap distance, together with the pressure (voltage) and your overall power. Also whatever tank circuit (C & L) you’re powering with it will also influence the rotary gap frequency. Calculating it all out is very difficult… And then it won’t quite match your calculations anyway!

So your best bet is to make your own probes or detectors to attempt to measure it and make adjustments as you go.

Tesla made special circuit controllers, using mercury and an insulating medium like oil. Thus his rotary segments made one make-break per segment, as the oil did not ionise like air gaps do…

I would suggest you abandon the rotary air spark gaps and go for something more controllable like a HF or RF generator, like a signal generator coupled with an RF amplifier*. That way you’ll get something to work as intended, gain an understanding of what’s going on and you’ll be happy with your amazing results. *Your amplifier could be something simple, cheap and low power, through to some monster of a device using thyratrons rated at many thousands of volts. Of course you’ll attract unwanted attention from the RF police doing that…

Then once you’ve worked out and understand what’s going on with a low power oscillator system, then return to the rotary spark gaps and then see if you can make a system work with it, that is if you still wanted to...

Sputins and his Chickens.

Sputins knows what he's talking about too

I would also recommend abandoning spark gaps. The key word is controllable.

Cute chickens by the way!

Thank you very much for being so helpful. I will consider your advices and for the moment put aside the mechanical oscillator.
You see, in my country people are good at just about everything and they laughed at this technology of Dr.Tesla. They are like drugged or possessed or something... They live under the impression that they know everything and nothing is new to them. God forbid this forum from having it's specimens as well.