Tesla-coil based expiriment / Tesla Coils / Forums

Forums

4hv.org :: Forums :: Tesla Coils

« Previous topic | Next topic »

Tesla-coil based expiriment

1 2 3 4 next last

Move Thread

LAN_403

tarakan2

Thu Jun 13 2013, 03:38PM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

Hello
I spent a while experimenting with resonant circuits that were driven by discharge of high voltage from that builds up inside a capacitor.

I noticed some interesting effects:

1) When there is a spark gap in the middle of the coil, the spark begins to act differently and seems to have a spherical appearance.

2) Neodym magnets inside a coil in resonance make this circuit draw more current but that doesn't seem to effect the current draw.

I have no ways of measuring those parameters. I have no oscilloscope or accurate frequency meter.

I want to build a very classical Tesla coil.

If I but a Neon Sign Transformer, what do I need to do to drive a 18" Tesla resonator?
What current of the NST?
Do I need a Terry filter and a safety gap?

How do I tune the primary capacitor bank to the secondary?
Is there any math I can do and what capacitors should I chose?

Based on my observation of the spark behaviour, I want to make a Tesla Coil secondary that will consist of two cones. The tips of those cones will face inwards with a spark gap between them.

Currently I am reading into some documents on Tesla's radiant energy experiments and I find it to be in coherence with my observations. Spark gaps in the middle of coils behave differently than ordinary spark gaps. They seem to spin and create less heat. All that was observed at 20KHz at around 20000V.

I live in Frederick MD, USA. If you live within 2hrs and you have a shop with a lathe, I will pay for this device to be wound on the lathe.

HV Enthusiast

Thu Jun 13 2013, 08:43PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

Just a note, that any discussion regarding free energy devices such as Tesla's Radiant Energy is PROHIBITED on the 4hV forum.

tarakan2

Thu Jun 13 2013, 09:19PM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

Ok
I won't use this term any more. If I get any interesting results I will post it on my personal blog, not here.

I need to build a tesla coil with a tunable self frequency of the primary coil. Secondaries will change.
What do I need to do?

I appreciate Eastern Voltage Research products, but I need to keep somewhat close to the classical design of the coil.
No electronics that I cannot adjust

Physics Junkie

Thu Jun 13 2013, 10:57PM

Registered Member #7267 Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407

make a large primary. Are you just saying that you need a 'universal' primary that can be tuned to many different secondary frequencies?

tarakan2

Fri Jun 14 2013, 12:16AM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

Physics Junkie wrote ...

make a large primary. Are you just saying that you need a 'universal' primary that can be tuned to many different secondary frequencies?

i think that this is what i want

but how would i tune it?
Change the number of capacitors in the capacitance bank?

Physics Junkie

Fri Jun 14 2013, 12:22AM

Registered Member #7267 Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407

You can do that and/or tap the primary. I did a similar thing with my last couple Tesla coils. I made a large primary with 11.5 Turns so that I can use it for many different secondary coils. Changing the tank capacitance will change the 'tunable frequency range' of the primary through use of tap points or adjustable tap

tarakan2

Fri Jun 14 2013, 02:01AM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

How would i know what capacitors should i use?
i can use picofarad capacitors, nanofarad capacitors, microfarad capacitors. I can make a bank of 10 a bank of 100 a bank of 1000.

I read that Tesla had built his transformers in such way that primary and secondary have the same mass.
Yes, mass of copper used to make the windings.

What do you think about this?

Ben Solon

Fri Jun 14 2013, 03:21AM

Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600

tarakan2 wrote ...

How would i know what capacitors should i use?
i can use picofarad capacitors, nanofarad capacitors, microfarad capacitors. I can make a bank of 10 a bank of 100 a bank of 1000.

That depends of many things like resonant frequency, transformer power, desired impedance, current handling capability, voltage rating and so many more that you need to determine that yourself.

tarakan2 wrote ...

I read that Tesla had built his transformers in such way that primary and secondary have the same mass.
Yes, mass of copper used to make the windings.

What do you think about this?

Yes, thatâ€™s because both ends have the same power. A transformer may change voltage and current with it's ratio, but power in will always be ~= power out minus losses.

tarakan2

Fri Jun 14 2013, 05:35AM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

Should I figure this out empirically ?
I know that there are Tesla Coil Calculators and various approximation formulas but what are the most important factors?
But there is also cost.

Dr. Dark Current

Fri Jun 14 2013, 10:07AM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Hi, today we know about the existence of skin effect and eddy current losses, so the equall mass of wire might not be (and is not) optimal.

1 2 3 4 next last

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob