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Is there any way to change the capacitance on a leyden jar/ bottle capacitor? Answered

I am trying to build a capacitor bank for my tesla coil. I am running two 15 kv transformers in parallel for 120 mah. I was running a bank of 7 .015 mf capacitors with 4 wired in series on each one but they burn out incredibly fast. I need a way to build my own that will either withstand the heavy stress or are simple to replace. Either way they need to be the exact capacitance of my tesla coil.

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alessiof76
alessiof76

Best Answer 11 years ago

You can lower the capacity simply removing part of the external plate to the bottle

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crazy coiler
crazy coiler

Answer 11 years ago

thankyou, however I tried to run a leyden jar made out of a plastic bottle, and electricity just arced through the bottle, melting it...

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alessiof76
alessiof76

Answer 11 years ago

try glass bottle

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08techgrad
08techgrad

10 years ago

Instead of using air which has a dielectric constant of 1, you could try some thing like paraffin that has a constant of 2.26.  If you REALLY want to be surreptitious, water has a constant of 78, titanium oxides vary from 10-10k!

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lemonie
lemonie

11 years ago

Do you not want to use a simple air-gap? L

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crazy coiler
crazy coiler

Answer 11 years ago

I'm not sure I understand what you mean?

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ElectricUmbrella
ElectricUmbrella

Answer 11 years ago

Lemonie means that, instead of a solid dielectric like the glass of the bottle, use two parallel metal plates. The air between them will serve as the capacitor's dielectric. You could easily rig one of the plates so that the distance between them will be adjustable (thereby varying the capacitance).

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ElectricUmbrella
ElectricUmbrella

Answer 11 years ago

A better way would be to immerse the two plates in oil - this prevents corona losses and will increase the capacitance.

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PKTraceur
PKTraceur

11 years ago

Well, to charge a leyden jar, (tediously, mind you,) get a 2.5 ft piece of PVC pipe. Rub the crap out of it with a cotton/silk cloth. While at the same time, rubbing the PVC, keep moving it over the top terminal. -PKT