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Re: Reactance
Thanks Tom,
On Sun, 2 Feb 1997, Tesla List wrote:
<snip>
> HERE'S YOUR ERROR! X=2*Pi*F*L for inductive reactance
> Also, F here is the RESONANT Frequency you want, NOT 50Hz!!
<snip>
> HERE'S YOUR ERROR! XL=2*Pi*F*L not the reciprocal as you used.
> Also, F here is the RESONANT Frequency you want, NOT 50Hz!! Try using
> 140Khz instead.
<snip>
Hmmm, thanks, might've helped if I didn't ask my friend to try to recall
the formulas from memory...I think I'll read a book next time! :-)
> YES! The resonant frequency of the SECONDARY is the prime item to be
> using!!!
Yeh, now the figures are appearing to be realistic instead of being out
by several factors.
> The 50Hz resonant thing with the neon transformer boils down to this: It
> is NICE to match the power input stuff, but NOT ABSOLUTELY NECESSARY!
>
> A good rule of thumb with a 30 ma neon is to use .005mfd for every 15KV of
> neon voltage. So a 60 ma 12KV neon would use (60/30)*.005*(12/15)
>
> This is just a guideline. MANY coilers use MUCH larger capacitance values
<snip>
Hmmm, neat idea. I hadn't looked at it that way...
Thanks for that, I'll note it down!
> Nope. 1) design secondary height, diameter, wire size.
> 2) calculate self-resonant frequency using hairy formulae.
> 3) build secondary
> 4) measure ACTUAL self-resonant frequency. Use THIS value in all
> subsequent equations. (unless you do steps #5 & #6)
> 5) make toroid if desired
> 6) place toroid on secondary and measure ACTUAL resonant frequency.
> Use THIS value in all subsequent equations.
>
> 7) design/build 14 turn flat spiral primary. ASSUME TAP at tenth turn.
> USE the Tenth Turn inductance value as your working Inductance.
> -or- design other type of primary if desired. 80% point is your
> operational tap and initial calculation point for inductance.
> This gives us tuning room for later!
>
> 8) calculate capacitance needed for resonance at tap ten such that
> both the primary and secondary circuits have the same resonant
> frequency. Build it and measure it if possible.
> 9) determine number of milliamps required from neon using approximation
> formula:
>
> 10) Add enough neons to ensure that you have enough milliamp capability.
> It is better to have too much current than not enough.
> 11) calculate any Power Correction Factor capacitance to be added to
> the primary of the neon transformer to enhance performance.
> 12) Add in all RF chokes/bypass capacitors/safety gap, etc.
> 13) Build a DECENT spark gap, such as the Richard Quick Air Cooled Quench
> 14) wire it using good RF wiring techniques
> 15) make sure you have a really good RF ground
> 16) Wire AC mains circuitry
> 17) make sure all other electronic equipment is unplugged and out of way
> 18) make sure no modems or any thing else is wired in to any computer
> 19) double check wiring. Is primary tap on? Is your secondary grounded???
> 20) make sure spark gap is properly adjusted (if adjustable)for initial
> close spacing.
> 21) plug it in
> 22) turn it on
> 12) Tune it for maximum output
> 13) Have fun!
Say, now there's a few things I missed...a damn good check list I must
say too! Thanks...
> Rodney,
> I hope the above remarks help you. The process is not too bad, but it does
> help to have it all written down so that we can see the typical sequence. I
> say typical, because there is no strict sequence. This is just the one that
> seems to me to best arrive at a working coil in the shortest time.
Thank you very much for your help, there wer some things of importance I
had actually overlooked and you brought to my attention.
Well, I'm getting some really nice results from the formula now, I can
actually calculate a TC's design from the primary down, only having to
know the resonant freq. of the secondary, which too can be mathematically
calculated, but better to actually measure it!
Thanks again, I hope your info can be a great helpful guide for others!
Catchya later!
Rod