Donald Smith Devices too good to be true

[MonsieurM]

from: http://www.tesla-symp06.org/papers/T...mp06_Corum.pdf

Abstract – The electrical properties of RF coils are deduced from
the boundary value solution of Maxwell’s equations. In the
1890s Tesla concluded, on the basis of experiment, that very
large voltages were attainable on helical resonators through the
mechanism of wave interference and standing wave phenomena.
For such structures lumped element circuit analysis fails
because its inherent presuppositions are inadequate. In the limit,
as the frequency is lowered, the mode distribution becomes
uniform and the RF solution passes to conventional lumped
circuit elements. This passage is demonstrated analytically.
Experimental measurements are employed to support Tesla’s
assertions.

The above theory and assertions may be confirmed
experimentally. Over the years, many large (and small)
helical coils have been constructed. Typical is the following
coil with physical parameters and top loading given by:
D = 24.25 inches
H = 55.4 inches
s = 0.175 inches
dW = 0.1019 inches
N = 316.5 turns
CT = 11.5 pF
L(measured at 1 kHz) = 22.1 mH

Lumped element circuit theory assumes that there are no
wave interference phenomena present, that is - the current
distribution along the circuit elements is uniform. It is this
nonphysical constraint (neglecting spatial variations in the
current distribution on coils) that has been used in the
handbook formulae for self and mutual inductance. Such
assumptions are reasonably suitable at frequencies far
below those for which RF phenomena and self-resonances
occur. But, they are thoroughly improper for Tesla coils
operating as Tesla used them after 1894.

[MonsieurM]

I found this in the ref mentioned in the article:

http://hamwaves.com/antennas/inductance/corum.pdf

RF coils, helical resonators and voltage magnification by coherent spatial modes

By modeling a wire-wound coil as an anisotropically conducting cylindrical boundary, one may start from Maxwell’s equations and deduce the structure’s resonant behavior. Not only can the propagation factor and characteristic impedance be determined for such a helically disposed surface waveguide, but also its resonances, ′self-capacitance′ (so-called), and its voltage magnification by standing waves. Further, the Tesla coil passes to a conventional lumped element inductor as the helix is electrically shortened.

---------------------


And here is the inductance calculator based on the previous post: RF Inductance Calculator - HAMwaves.com

[MonsieurM]

Have you guys ever heard of a : Thyratrons

Amazing Vacuum Tubes May Eliminate Motors

Amazing Vacuum Tubes May Eliminate Motors

by JAY EARLE MILLER

Based on an interview with Dr. W. R. Whitney and Associates of the General Electric Research Laboratories Scientists have accomplished the marvelous feat of literally taking nothing, sealing it in a glass tube and making it perform the tasks hitherto done by huge motors. Thyratrons, as these amazing vacuum tubes are called, may soon relegate all machinery to the junk pile. Already vacuum tubes are curing dread diseases, increasing the range of man’s senses, and saving industry huge sums.

IMAGINE a tube, a thing of glass and metal, replacing a motor to operate a piece of machinery. Imagine a fiat bed printing press—or any machine using a reciprocating motion-—getting its energy from a glorified descendant of a radio tube.

That’s just one of the things that research engineers of the General Electric Company expect to see within the next few years. With Thyratron power tubes and solenoids it is technically possible today.

And that’s just what a Thyratron is, for it will convert direct current into alternating, or invert alternating current into direct As a valve it can replace switches, current breakers or lightning arresters. It can change current of one frequency into another, or pick out any particular portion of an electrical wave and put it to work. It can control any form of electrical apparatus, operate burglar alarms and do other forms of work. And it may even, as Mr. White predicts, displace electrical motors.

[MonsieurM]

interesting vid:

Powering a Thyratron Tube - YouTube

btw: a Thyratron Tube is like a plasma antenna

Plasma antenna - Wikipedia, the free encyclopedia

]A plasma antenna is a type of radio antenna currently in development in which plasma is used instead of the metal elements of a traditional antenna.[1] A plasma antenna can be used for both transmission and reception.[2] Although plasma antennas have only become practical in recent years, the idea is not new; a patent for an antenna using the concept was granted to J Hettinger in 1919.[3]

---------------from Evolution of the E.V. Gray Circuit Topology -- by Mark McKay vs. Thyratron

Triode vs. Thyratron

John Bedini maintains that the E.V. Gray “Triode” was actually a high current thyratron operating in Class C mode possibly with a grounded grid. The commutater achieved the gross switching control and the thyratron was simply over-voltaged to fire like a flash tube. The intent was to provide a low resistance forward current path and then a high resistance reverse path. The advantage of a thyratron is that its heated cathode provides a fast reverse recovery time, when compared to solid-state diodes. The down side is the huge energy investment needed to supply the thyratron heater. But, it is not nearly as bad as the energy required to operate a triode in the same current range. For a standard triode the maximum forward pulse current is directly proportional to the heater wattage. This determines the number of free electrons in the space charge. In a mercury gas filled thyratron positive and negative current carriers are created in abundance when the switching “arc” is established. The maximum pulse current is more limited by the tube’s heat dissipation and the mechanical strength of its internal elements. Short-term reverse currents are inhibited due to the inertial mass of the moving positive mercury ions. For the same size of tube a thyratron can handle 1000 time more current than a triode. So there are some sound engineering reasons to believe that a thyratron might have been used

[leo48]

This valve does all these things?
I now know what to do ....
Leo48

http://img37.imageshack.us/img37/1520/immag071r.jpg

[RAMSET]

Thanks for the Pic

Leo
How about a few well picked words to go with the Pic??
Thanks
Chet

[leo48]

@Chet
excuse-me but today on Europe have many problem for internet network
Leo48

[JohnStone]

Hi John I read alot too from this thread to see exactly what I should do and now feeling my mind exploding
Regarding flyback I have many of these even one from an old BW tv. This is better for these type of circuits?
Thanks guys for the info on this thread especially Zelina

Hi Gurji,
your head feels exactly like mine. There is no single way - but a plurality of possible ways are in discussion. All components form an ensemble and all share the same goal and need to be tuned to their dance.
You are right to concentrate on HV-supply first but it needs to be in harmony with the primary circuit up to L1. I feel that it is essential to kick the tank circuit with short pulses of high voltage. Inbetwen these events the L1 circuit can oscillate with its genuine resonant frequency. Brute force sparks with long duration are not helpful. So it seems not to be so easy as choosing supply type a or b.
It is essential if you operate a TV HV transformer as pulsed flyback or to produce a steady ac. The schematic connected will be different.
As example: See the pulse shaping components in the dynatron schematic directly after the HV supply (capacitor C5 and 2 diodes DV3 and DV4). In this example the voltage rise at C5/FV1 should be not too steep because then the spark gap will fire before you enter suffitient energy into the tank circuit L1.
Measurement is a must for tuning.
I will test a 50 Hz nenon sign transformer and a flyback transformer. Additionally I will evaluate the HV supply from energy saving neon bulbs and CCFL HV supplies as soon as I have some means to mesaure HV.
I will post my results but it will take some time because I have to earn some money aside my tinkering.

Additional advice for all:
Keep the wire connections between the components as short as possible if you intend to get reliable results. We deal with high frequencies and at these conditions wires behave somehow tricky and are antennas (receive and transmit). A simple square wave signal with steep edges may be inadequate after 4 feet of wire because the quality of the edges is composed of much more higher frequencies.

Regards
John

[boguslaw]

Hi Gurji,
your head feels exactly like mine. There is no single way - but a plurality of possible ways are in discussion. All components form an ensemble and all share the same goal and need to be tuned to their dance.
You are right to concentrate on HV-supply first but it needs to be in harmony with the primary circuit up to L1. I feel that it is essential to kick the tank circuit with short pulses of high voltage. Inbetwen these events the L1 circuit can oscillate with its genuine resonant frequency. Brute force sparks with long duration are not helpful. So it seems not to be so easy as choosing supply type a or b.
It is essential if you operate a TV HV transformer as pulsed flyback or to produce a steady ac. The schematic connected will be different.
See also the pulse shaping components in the dynatron schematic directly after the HV supply (capacitor C5 and 2 diodes DV3 and DV4).
I will test a 50 Hz nenon sign transformer and a flyback transformer. Additionally I will evaluate the HV supply from energy saving neon bulbs and CCFL HV supplies as soon as I have some means to mesaure HV.
I will post my results but it will take some time because I have to earn some money aside my tinkering.

Regards
John

I fully agree! Dig it ! It is essential to make DISRUPTIVE DISCHARGE not just put spark gap and expect primary working with resonance. We need NATURAL RESONANCE and i don't know why Zelina is not putting BIG ATTENTION to this fact ! All electronic resonance is forced one. Compare it with Tesla method of transformation.

[Guruji]

Flyback

Thanks John and Boguslaw the thingy is that I'm still striving with this flyback driver already burned three transistors
Trying to check my flybacks right now which is good and bad before I move to a more professional driver.
I can say I'm not a Guru in electronics for sure like many experts on this thread but I've build circuits in the past.
I cannot understand what I did wrong exactly ok I used 220ohm and 22ohm resistor to the flybacks but transistors burned
Any help please?
Thanks.

[JohnStone]

Thanks John and Boguslaw the thingy is that I'm still striving with this flyback driver already burned three transistors
Trying to check my flybacks right now which is good and bad before I move to a more professional driver.
I can say I'm not a Guru in electronics for sure like many experts on this thread but I've build circuits in the past.
I cannot understand what I did wrong exactly ok I used 220ohm and 22ohm resistor to the flybacks but transistors burned
Any help please?
Thanks.

Hi Guruji,
flybacks are known to burn their transistors because of the voltage peak when switching off. Very probably you got one of several possible breakdown because of overvoltage. I red yesterday that the max transistor voltage (CE) schould be 3 times the supply voltage - rule of thumb.

Possible actions:
- If you have a small neon bulb (indicator light) then you can add it (without series resistor) from collector to GND. Bedini does this at his SSG motor.
- Start with 6 V supply.
- Reduce primary windings. (mine has 5 turns primary!)
- Insert a diode before the transistor basis. There can occur negative votlage. 5V minus are allowed max!!


If you have no scope available than you can build a simple peak detector and measure with DVM after some seconds. You need a diode and a capcitor of some nF. Capacitor between Diode and GND. Discharge the capcitor befor any measurement. (replay if you need schamatic)

So you can start with the actions above and check at at moderate conditions at least the peak voltage at the collector side.
Or you reverse the diode und measure the peak negative voltage at the base.

Regards
John

[frankidel]

folks dont get swayed by thermionic tubes and power transistors. don and kapanadze used spark. and they know why even in these modern times where u can use igbt.

the high power electronics is just waste of electricity. and there is no one who produced more power using igbts without the input loaded.

have clear mind. the tubes r not gonna help. spark will help u only.

rgdz
zzzz

Hi Zilano, for the spark gap, if i put it in a tube with air out, or vaccumed, will it help the process, i remember that tesla tested a copper tube with air removed and it was quite good output.

thanks for your support.

[AhuraMazda]

Thanks John and Boguslaw the thingy is that I'm still striving with this flyback driver already burned three transistors
Trying to check my flybacks right now which is good and bad before I move to a more professional driver.
I can say I'm not a Guru in electronics for sure like many experts on this thread but I've build circuits in the past.
I cannot understand what I did wrong exactly ok I used 220ohm and 22ohm resistor to the flybacks but transistors burned
Any help please?
Thanks.

You need to put a diode across your transistor to protect it.

I don't like your oscillator. It is a poor design.
I recommend Royer oscillator.

[Guruji]

Flyback Driver

Hi Guruji,
flybacks are known to burn their transistors because of the voltage peak when switching off. Very probably you got one of several possible breakdown because of overvoltage. I red yesterday that the max transistor voltage (CE) schould be 3 times the supply voltage - rule of thumb.

Possible actions:
- If you have a small neon bulb (indicator light) then you can add it (without series resistor) from collector to GND. Bedini does this at his SSG motor.
- Start with 6 V supply.
- Reduce primary windings. (mine has 5 turns primary!)
- Insert a diode before the transistor basis. There can occur negative votlage. 5V minus are allowed max!!


If you have no scope available than you can build a simple peak detector and measure with DVM after some seconds. You need a diode and a capcitor of some nF. Capacitor between Diode and GND. Discharge the capcitor befor any measurement. (replay if you need schamatic)

So you can start with the actions above and check at at moderate conditions at least the peak voltage at the collector side.
Or you reverse the diode und measure the peak negative voltage at the base.

Regards
John

Thanks John for the info. Yes I will do a neon to the transistor as bedini motor. When you said to add diode from feedback to base you meant? 1n4001?
Thanks

[AhuraMazda]

Thanks John for the info. Yes I will do a neon to the transistor as bedini motor. When you said to add diode from feedback to base you meant? 1n4001?
Thanks

The cathode to 0V the anode to collector. 1n4001 is fine as long as the voltage rating is ok. Still, use 1n4007 if you have.

Teravolt.org - ZVS Driver