Re: another question about neon transformers and multipliers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jack Vandam" <snotoir7674g-at-mindspring-dot-com> 

Hi Steve,

Thanks for your response.  I guess the best bet then would be to drive the
tripler(s) with a robust tv flyback circuit.  I do have such a circuit
available and working, but I had hoped for more current at the hv output,
which should be between 80-100 Kv when I'm completed the multiplier
modifications.   Any thoughts from the group (or you) on how to get more
current out of this configuration?

Jack

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, September 25, 2004 1:47 PM
Subject: Re: another question about neon transformers and multipliers


 > Original poster: "S&JY" <youngsters-at-konnections-dot-net>
 >
 > Jack,
 >
 > In the first place, your transformer is rated 15 KV with no load.  The 30
ma
 > is with a very low resistance load, such as a neon sign tube or a short.
 > About the best you can get is 10 KV -at- 20 ma out of the unmodified
 > transformer.  There are tricks to get more, such as running the primary at
a
 > high voltage, removing the magnetic shunts, and/or using a load with a
 > capacitive reactance such that it causes a resonance with the supply
 > frequency.  Since you are an inexperienced beginner, I don't recommend you
 > do any of these.
 >
 > Your tripler is designed to run at about 16 kHz.  Running it at 50 or 60
Hz
 > won't work because the capacitors in your tripler will be far too small.
 > They will act like very high value resistors, greatly limiting the current
 > they can pass.  If you do it, you might get roughly 50 KV at a few
 > microamps - not very useful except for an air ionizer, electrostatic
 > precipitator, etc.
 >
 > However, you are likely to also get a burned out NST.  NSTs are not
designed
 > to run at full voltage continuously, as would happen with your tripler.
 > Neon signs need the high voltage to ionize the neon or other gas, then the
 > voltage drops down substantually once the gas is ionized and conduction
 > starts.
 >
 > If you search the list archives, there have been various postings over the
 > years about voltage multipliers that may prove educational for you.  Also,
 > try to find a new or used "The ARRL Handbook for Radio Amateurs" and read
 > the power supply theory and construction articles - very helpful
 > information.
 >
 > --Steve Y.
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Friday, September 24, 2004 11:32 AM
 > Subject: another question about neon transformers and multipliers
 >
 >
 >  > Original poster: "Jack Vandam" <snotoir7674g-at-mindspring-dot-com>
 >  >
 >  > Hello again:
 >  >
 >  > Here's my next question.  I know it's running right behind my previous
 >  > intro/ question, but I'm trying to space them out as best as I can....
 >  >
 >  > I know that neon transformers and hv multipliers (tv triplers) don't
mix
 >  > very well due to frequency design differences, but how detrimental are
the
 >  > differences to operation?  Say, for example, I used a tv tripler to
 > multiply
 >  > one 7.5 Kv leg of a 15 Kv neon to get 22.5 Kv.  How much of the
original
 >  > input current (30 mA) would still be available?  Ballpark figure of
 > course.
 >  >
 >  > Thanks,
 >  > Jack
 >  >
 >  >
 >  >
 >  >
 >
 >