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Re: ignition coil Plasma ball

TechnoLux sells 10-liter disposable tanks of 99.999% Kr for $150. The Xe is
$300. This is regular productioin, not surplus. Don't know why anybody
would charge $13K/ltr.

Ken Donnell
bigken-at-a.crl-dot-com

Out of my mind.  Back in five minutes.

----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: ignition coil Plasma ball
> Date: Saturday, July 17, 1999 8:33 PM
> 
> Original Poster: "Dr. Resonance" <Dr.Resonance-at-next-wave-dot-net> 
> 
> to: Jim, Phillip
> 
> Commercial globes such as we manufacture use a flyback type running with
an
> adjustable freq for tuning to the gas mixture.  The tuning range is
usually
> only 1 kHZ wide for best display.  We never use style transistor circuits
> with flybacks, but, due to reliability issues, always use SCR type driver
> systems for ignition coil driver circuits which we use to trigger our
large
> Marx impulse generators.
> 
> Globe gases are typically neon, xenon, and krypton (at $13,000.00 per
> liter -- no misprint) blended in a gas manifold.
> 
> Regards,
> 
> Dr.Resonance
> 
> 
> -----Original Message-----
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
> Date: Saturday, July 17, 1999 3:31 AM
> Subject: Re: ignition coil Plasma ball
> 
> 
> >Original Poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
> >
> >Pulse width is THE critical parameter when driving an ignition coil with
a
> >low voltage (i.e. 12V).. You have to leave the power on long enough to
get
> >the current through the coil high enough (that I = V/L *delta T thing)
so
> >that you have a reasonable amount of stored energy (L*I^2/2).. A typical
> >coil current is 5A...
> >
> >You can see that doubling the time makes the energy 4 times greater, so
it
> >has a very large effect.  The HV impulse comes when the transistor turns
> >off (BTW, a 3055 won't last too long with 400 V across it... every time
you
> >run it it gets a bit more thrashed... or, it just avalanches and acts
like
> >a 100V zener, and dissipates a fair amount of energy and, more important
> >limits the output voltage) (Use an ignition transistor like a 2n6062 (I
> >think that's the number) with a BVceo of 400V, or a horizontal output
> >transistor (A radio shack part) with a BVceo of 700V)... both of these
are
> >TO-3 packages, BTW).
> >
> >In a V8 car application,  running at 6000 RPM (100 RPS), the pulse width
is
> >about a millisecond.  (PRI = 2.5 mSec)
> >
> >Capacitive discharge ignitions don't rely on the slow ramp up of current
> >and then the Ldi/dt to get voltage.. They charge up a (typically 1 uF)
cap
> >to around 400V and just dump it into the coil.  400V doesn't take as
long
> >to get the coil current up to 5A.
> >
> >----------
> >> From: Tesla List <tesla-at-pupman-dot-com>
> >> To: tesla-at-pupman-dot-com
> >> Subject: ignition coil Plasma ball
> >> Date: Thursday, July 15, 1999 6:11 AM
> >>
> >> Original Poster: Philip <shadow42-at-totcon-dot-com>
> >>
> >> Before I have tried many times to get a ignition coil based plasma
ball
> >> to perform. I do beleive ive found what I was doin wrong and will pass
> >> it along. I am now useing a pulse generator to do my work instead of
the
> >> 555 of the past. Here are my system specs.
> >>
> >> Coil - Ford standard coil 12v
> >> Pulse gen - Systron donner 100a
> >>    settings
> >>                Repetition rate - 1mhz
> >>                Pulse delay - 10us
> >>               Pulse width - 1ms
> >>               Base voltage - 3v
> >> Power source - 12v sealed gel cell battery
> >> Transistor - 2n3055
> >> Heatsink - 12x5" all finned stock
> >> Globe used - 5" commercial globe (gas content unknown)
> >>
> >> I found that adjusting the pulse width was more critical in the
> >> performance than the repetition rate. Amplitude setting was set about
> >> 3v. 3055 never became warm during operation. I have a digital cammera
> >> but it will not photograph the plasma ball well. I tried and tried. I
> >> even fittled with exposeure time to no avail. I need to get out the
real
> >> cammera. Hope this helps someone. My original photos are at
> >> http://hv.hypermart-dot-net/pb.html.
> >>
> >>    Philip Mac Duffie
> >>
> >>
> >
> >
> 
>