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Old 18th May 2012, 07:21 AM   #11
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Also, do you enjoy breathing O3?? (ozone)
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Old 18th May 2012, 10:33 AM   #12
bigwill is offline bigwill  United Kingdom
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Quote:
Originally Posted by costis_n View Post
Also, do you enjoy breathing O3?? (ozone)
I must admit I'm fond of that sweet ozone smell

Quote:
Originally Posted by MadsKaizer View Post
Hey Bigwill
I have built 7 Tesla coils and one of them was a VTTC, you can see it here Kaizer VTTC I | Kaizer Power Electronics and I will gladly answer any questions you have.
Thanks, that is brilliant

Quote:
Originally Posted by Michael Koster View Post
Whether the primary is a tuned circuit of uses an oscillator, it is driven at approximately the resonant frequency of the secondary.
This is what I'm still struggling with - the primary coil is generally on the order of 30-100μH, and the secondary resonance is usually in the hundreds of Khz range. The reactance of the primary will be pretty low at these frequencies, tens to hundreds of ohms - certainly not something a tube is happy driving. Will the coupling to the resonant secondary increase this, or must I add a tank capacitor in parallel so the impedance peaks around where you want? (Q could be adjusted to give you a usable range of tuning)

What gets me is I've seen a VTTC design WITHOUT an anode tank capacitor here: Miniature Vacuum Tube Tesla Coil

There is one in the grid circuit, but presumably that's just to set the oscillation freq, not energy storage?
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Old 21st May 2012, 10:40 AM   #13
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Quote:
Originally Posted by bigwill View Post
I must admit I'm fond of that sweet ozone smell
Thanks, that is brilliant

This is what I'm still struggling with - the primary coil is generally on the order of 30-100μH, and the secondary resonance is usually in the hundreds of Khz range. The reactance of the primary will be pretty low at these frequencies, tens to hundreds of ohms - certainly not something a tube is happy driving. Will the coupling to the resonant secondary increase this, or must I add a tank capacitor in parallel so the impedance peaks around where you want? (Q could be adjusted to give you a usable range of tuning)

What gets me is I've seen a VTTC design WITHOUT an anode tank capacitor here: Miniature Vacuum Tube Tesla Coil

There is one in the grid circuit, but presumably that's just to set the oscillation freq, not energy storage?
You are right about the grid circuit, its only feedback and not a energy storage.

To explain it simple, running a Tesla coil without a tank capacitor will make you able to produce sparks, but not very big ones. With these it is important to have a feedback locked on the secondary frequency.

With a tank capacitor you get much higher peak currents in the primary circuit and you deliver a greater amount of energy to the secondary in shorter time and thus get longer sparks.
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