Re: tesla coils
-=> Quoting Joe Perulero to Mark Graalman <=-
JP> i have mylar film 0.014 inch thick , poletheylene 0.05 inch thick .Do
JP> you absolutely need to submerge them in transformer oil?
MG> Yes, Joe they have to be in oil if you expect to get any life out of them
MG> but it doesn't have to be transformer oil, it can be mineral oil,
MG> castor oil, and some have even used motor oil. I use an oil marketed
MG> by Texaco called Regal oil R&O #46, it acually is repackaged transformer
MG> oil sold as turbine oil and it works very well. It comes in 5 gallon
MG> cans and sells for about $22.00 for the 5 gallon container.
MG> I would use the polyetheylene for the capacitors, I wanted to try
MG> mylar a few years back, I talked to an engineer at the Plastic Capacitor
MG> Corporation and he said that mylar is a good material for L.V. Low
MG> Frequency A.C. caps or H.V. DC capacitors but Mylar "doesn't like"
MG> H.V. A.C. and would most likely melt, so I never tried it. But the poly
MG> works very well.
JP> I like to build flat plate capacitors!
MG> Thats all I've ever built, but the rolled style do work well!
JP> I am having trouble fine tuning the capacitor to the right resonant
JP> value to get my coil moving which is around 0.0032uf.
MG> If the capacitor is faily close to the required/desired value, tuning
MG> should be accomplished by adjustment of the primary coil. Are you sure
MG> the primary coil tuning range will cover the frequency of secondary?
MG> The primary coil/capacitor resonant frequency should cover that of the
MG> secondary coil with the primary taped at AT LEAST 5 turns and
MG> preferably more, like 8 to maybe 10 or 12 turns.
JP> I have an
JP> instrument that measures capacitance and it tells me that i am at this
JP> value but the capacitor buzzes and sort of works but when compared to a
JP> high voltage industrial cap I have of 0.003 uf it doesn't work nearly
JP> as good.? why is this ?
MG> Hard to answer, I don't know how your cap is built. Could be you have
MG> a poor dielectric, corona losses, poor plate connections limiting the
MG> maximum current discharge capability, leakage losses, etc. etc.
JP> I would appreciate any help you can give and any complete plans you
JP> may have of building tesla coil systems !!
JP> Best regards
JP> Joe Perulero
MG> I hope I've given you some things to check into, to think about.
MG> I don't have any "Tesla coil plans" per se' but I think maybe
MG> Richard Quick could help you out there and/or point you in the right
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