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Author Topic: Tesla HV Coil  (Read 8227 times)

Offline TheCell

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Tesla HV Coil
« on: February 09, 2011, 09:45:10 AM »
Hello

it's somehow kapanadze related.(delamorto)
THe secondary of a Tesla Coil is the primary of a kapanadze coil operated through a spark gap.

Please check my assumtions whether they are correct or not
and complete them if necessary.

This setup meant to establish a standing wave with a 0 V Node and a Lambda / 4 position with max elongation at the other end.

Is it (when operated through a spark gap) allways a quarter wave, or a half wave or multiple of a whole wave so that there are  2* n maximums that are achieved.

The frequency depends only on the number of turns.

In the circuit diagram the 10...300 pF cap imho is used to retune the L1 to resonance if a load is applied (bulb).

So there is the spark gap in series. Can it be a resonant LC paralell tank through the spark gap ?




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Tesla HV Coil
« on: February 09, 2011, 09:45:10 AM »

Offline darkspeed

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Re: Tesla HV Coil
« Reply #1 on: February 09, 2011, 05:56:32 PM »


The L1 + 10kv cap + spark gap is a tank.

The spark gap when ionized becomes a conductor for the duration of the arc.

There will be many cycles exchanged between the capacitor plates through the L1 before the ionized spark gap collapses.

The 10kv cap ( and the inductance, capacitance of L1 ) sets the primary frequency.

The spark gap allows a charge to build in the 10 kv cap so there is enough stored energy to excite the primary.

Offline bboj

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Re: Tesla HV Coil
« Reply #2 on: February 09, 2011, 07:07:53 PM »
If this is a Tesla setup than the length (and not the number of turns) on secondary plus primary depends on f of lc circuit.
This way you also determine where you want points of maximum excitation - at one end lambda/4, at the both ends lambda/2.

Offline TheCell

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Re: Tesla HV Coil
« Reply #3 on: February 09, 2011, 11:04:34 PM »
@darkspeed: confirming my thoughts

@bboj: I am missing the basics. (or at least understanding only partially)

Assuming that there was only one coil with one end grounded, the other fed by a sparc gap and no capacitor.
There would be a standing wave of Lambda / 4 by definition.
Is there a formula for determining the resonance freq. of a coil in the above mentioned configuration.

If having a load on the secondary the tank circuit comes into action helping maintaining the standing wave.
Having the frequency, measuring inductivity L of the coil and getting C via the classic LC Tank resonance formula. f = 1/( 2 * Pi * sqrt( L * C ) )



Can someone point out to sources that are related to creating standing waves and the resonance frequency of the coils . On the secondary is only a load put on.
Why does the sum of the length of both coils have influence on the frequency and not only the primary.

Does this reflect to the design of the secondary.

Offline darkspeed

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Re: Tesla HV Coil
« Reply #4 on: February 10, 2011, 01:28:45 AM »



You have to look at the L1 as if the spark gap was not there

What will affect the L1 frequency

Capacitance and inductance of the 10kv cap
Capacitance and inductance of the L1 coil
Capacitance and inductance and proximity of both of the L2 coils
Inductance and Hysteresis of the core material

Take a look here for some of the basic equations.

http://deepfriedneon.com/tesla_frame6.html

It is always slightly off from calculations and requires empirical adjustment


Free Energy | searching for free energy and discussing free energy

Re: Tesla HV Coil
« Reply #4 on: February 10, 2011, 01:28:45 AM »
Sponsored links:




Offline bboj

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Re: Tesla HV Coil
« Reply #5 on: February 10, 2011, 09:18:47 PM »
@ THE CELL - I am sorry I was a bit too quick with my post.
What I wanted to say was that if it is a Tesla coil configuration and you want the points of max excitations on the ends of the coil(tesla coil) the excitation f and the speed of the propagation of impuses c determines the lenght of the coil. The no of turns is not important, the lenght is. The impulse travels from the beginning of the coil - wire and back. So the higher the f the shorter a coil.

Offline TinselKoala

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Re: Tesla HV Coil
« Reply #6 on: February 12, 2011, 04:42:56 AM »
A Tesla secondary should use a length of wire that is equal to a quarter-wavelength of the excitation frequency. The number of turns comes into play when deciding whether to use a short-fat form, or a tall-skinny form. Substantial energy can be stored in inter-turn capacitance. In a short fat coil, there is more voltage difference between adjacent windings than there is in a tall skinny coil. Short fat coils work better for maximum power transfer between primary and secondary. Tall skinny coils work better for transmitting power across space, as in  this small Tesla power plant.

This power plant is drawing only a few Watts (35 or so here) from the mains, and yet it will light up as many fluorescent bulbs as you can hold near it. Turn up the power (by opening the gap, bottom right, now nearly completely closed) and the range increases proportionally.


Free Energy | searching for free energy and discussing free energy

Re: Tesla HV Coil
« Reply #6 on: February 12, 2011, 04:42:56 AM »
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