Tesla coils are used in all sorts of fringe science research, from kirlia=
n
photography, to the Philadelphia Experiment (apparently?). Well I have a =
new
system which I hope will benefit in such researches.
Like most great discoveries, I came across a system (through experimentin=
g)
which enables the tuning and the high voltage end to be separate from eac=
h
other. You get a pretty good output for the power you put in and the
"lash-it-together" construction. So if like me you want a good system wit=
h
the minimal of craftsmanship, then this system is for you. I mean, you ha=
ve
got this great experiment, but first you need to build a coil. Well this =
can
be put together in less than a day. Poor construction, excellent
performance!
As mentioned, the active coil can be located some distance from the tunin=
g,
makes pyramid experiments smaller at least! I used a neon transformer, bu=
t
you could get some good results from, say, an ignition coil set up.
I guess it looks like a magnifier, only it is built differently (coil
resonances etc...) and operates on a much lower power (the one I built wa=
s
125VA, rather than the usual magnifiers which are in the 2kVA minimum
region!).
Well, take a look, this is no over unity machine or interdimensional
porthole, but if you wanted to build any of these, you might need a trust=
y
old tesla coil. The document below is cut-and-past from the original I
wrote, as it is frowned upon to send attachments on this list, you can ge=
t
the full 101k .zip file if you e-mail: gdingley@telinco.co.uk. The file
includes a schematic, a copy of the document below and pictures of the
system I built on these same principles.
Well hope it is of some use.
Regards,
Gavin
--------------------------------------------------------------------
HALF-WAVE MAGNIFIER COIL??
By G. Dingley
This variation on the standard quarter wave tesla coil may prove to be of
some use in experiments where the system tuning and active end are requir=
ed
to be remote from one another.
It may be the case that all this coil consists of is a secondary coil tha=
t
is split with one fraction in the primary coils field and the rest moved =
to
one side upon an insulating support. On the other hand this system may be=
as
described, a half wave magnifier.
This coil was develop purely by chance, while experimenting with a small
quarter wave tesla coil, I wondered (already having some knowledge of
magnifier systems) what would happen if I connected a larger coil onto th=
e
top of the first. The result was a fairly dramatic increased voltage outp=
ut.
The following description is for the second "half-wave magnifier" I
developed from the results of the first accidental system. After building
this second system I did some fairly rigorous measurements and calculatio=
ns
to try and ascertain exactly what was going on. The conclusions drawn fro=
m
these results, and the results themselves, are given below (also see diag=
ram
hwtc1.bmp).
PRIMARY CIRCUIT
PRIMARY CAPACITOR: 5 banks of 4 series connected 10nF/7.5kV in parallel,
giving a total capacitance of 12.92nF measured.
PRIMARY COIL
Type: helix
Inductance: 7.5uH measured.
SECONDARY CIRCUIT
SECONDARY COIL
Type: helix
Diameter: 41mm measured.
Height: 148mm measured.
Number of turns: 698 calc.
Wire diameter: 212um measured.
Length of wire wound: 90m calc.
Self Inductance: 3mH measured.
1/4-wave self resonant frequency: 800kHz measured / 833.33kHz calc.
Self capacity: 12.54pF calc.
EXTRA COIL
Type: helix
Diameter: 64mm measured.
Height: 213mm measured.
Wire Diameter: 212um measured.
Number of turns: 1004 calc.
Length of wire wound: 198.71m calc.
Self Inductance: 11mH measured.
1/4-wave self resonance: 377.44kHz calc / 351kHz measured.
Self capacity: 19pF calc.
ISOTROPIC CAPACITY
Size: 10.5mm diameter sphere.
Resonant frequency (1/4-wave) of Extra coil with isotropic: 282kHz measur=
ed.
Total capacitance: 29pF.
Capacity of isotropic: 29pF - 19pF =3D 10pF.
COMPLETE SET-UP
Primary circuit resonant frequency: 511.27kHz calc.
Secondary circuit resonant frequency (1/4-wave): 247kHz measured.
Coupling Factor (Primary-Secondary): 0.03 measured*
Resonant frequency of just Extra coil with isotropic (1/4-wave): 282kHz
measured.
Total self capacity of whole of secondary circuit: 29pF calc.
*Note: Measurement of coupling factor may be in error due to use of dubio=
us
equipment!
INPUTS AND OUTPUTS
Power transformer used: 5kV @ 25mA =3D 125VA
Length of spark from just the secondary coil: 1" measured directly to
grounded point.
(see spark1.bmp/spark2.bmp/spark3.bmp)
Length of spark from complete system: 6" measured directly to grounded
point.
(see disch1.bmp/disch2.bmp/disch3.bmp)
(disch3.bmp shows that perhaps sphere rim limits possibility of longer
discharges from extra coil?)
CONCLUSIONS
The only time when the resonant frequencies of the Extra coil and Primary
circuit match, is when the Extra coil is resonating in the 1/2-wave mode
rather than the 1/4-wave. The 1/2-wave resonant frequency of the Extra co=
il
is 564kHz, while the Primary circuit=92s frequency is 511kHz, giving a
difference of 53kHz. With the addition of the Secondary coil, the resonan=
t
frequency of the Secondary circuit (Secondary and Extra coils) drops to
247kHz (1/4-wave mode). This results in a 1/2-wave mode resonant frequenc=
y
of 494kHz, a difference of 17kHz with respect to the Primary circuit=92s
frequency.
It could be argued that all that has happened is that electrically a bott=
om
section of a standard tesla coil secondary has been placed in the primary=
=92s
field, while the rest operates out side of it. However the whole secondar=
y
circuit is resonating in the 1/2-wave mode with one end grounded (the gro=
und
was simply a large aluminum foil sheet connected to the base of the
Secondary coil). If the secondary circuit was a 1/2-wave coil, then the
ground would dissipate the energy leaving none to manifest at the top of =
the
Extra coil.
Another point is that the self capacity of the Secondary coil is 12.54pF,
yet in measuring the self capacity of the whole secondary circuit (29pF) =
it
appears that it is composed of only that of the Extra coil (19pF) and the
isotropic capacity (10pF). This would suggest that the voltage generated =
by
the Secondary coil, which feeds the Extra coil, is of a high potential bu=
t
still has a substantial amount of current.
It is thus concluded that the Primary and Secondary coils act as a step-u=
p
high frequency transformer supplying energy to the Extra coil resonator.
Comments are warmly welcome from those who are much more experienced than
myself and who may be able to point out the obvious that I have not as ye=
t
seen. My e-mail is:
gdingley@telinco.co.uk
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