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Re: tesla virgin no more ! but need help
Original poster: "steven hyman" <steve502-at-bellsouth-dot-net>
In your previous post you claim
"With stationary sparkgap, best capacitance = 1.6 * Cres = 1.6 * 5.3 nF =
8.48 nF = .0085 uF
For synchro RSG, best capacitance = 3.2 x Cres = 17 nF = .017 uF (this is
absolute max value)
2.8 to 3.2 is good range for synchro RSG's.
With stationary sparkgap, best capacitance = 1.6 * Cres = 1.6 * 5.3 nF =
8.48 nF = .0085 uF
For synchro RSG, best capacitance = 3.2 x Cres = 17 nF = .017 uF (this is
absolute max value)
2.8 to 3.2 is good range for synchro RSG's."
remember I have a stationary spark gap
according to your formula's
I need around .008uf capacitance=around 8 nf
Am I Crazy ???????????????
Steve
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, February 06, 2004 6:53 PM
Subject: Re: tesla virgin no more ! but need help
> Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
>
>
> No, you need 2 strings in parallel to get the 17.6 nF required.
>
> Dr. Resonance
>
> > >
> > > .15 uF / 17 caps per string = .0088 uF per string x 2 strings in
> parallel = .0176 uF =
> > > 17.6 nF bank total capacitance
> > >
> > >
> > > Your .02 uF rating would be extreme even for a synchro RSG type
> sparkgap
> > and
> > > way to large for a stationary sparkgap.
> > >
> > >
> > > Dr. Resonance
> > >
> > > Resonance Research Corporation
> > > E11870 Shadylane Rd.
> > > Baraboo WI 53913
> > > >
> > > > My caps are Cornell 942C16P15k rated -at-.15uf 1600VDC . I figured
on
> a
> > > total
> > > > capacitance
> > > > of around .02 uf , why am i way off here?
> > > > I have a safety gap set a hair over firing gap space about .28".
> What I
> > > > don't understand is if ..02uf is way overkill for a 15/30 with a
> static
> > > gap
> > > > why does the coil operate with my 9/30,
> > > > I would like to properly match MMC size and Gap size for this 4"
> coil
> > > based
> > > > on some recommendations
> > > >
> > > > I have not blown any other caps since then
> > > > when I apply power to the coil with a 15/30
> > > > the gap fires briefly the coil functions for 1-5 seconds and then
> > stops.
> > > >
> > > > Steve
> > > >
> > > > Steve
> > > >
> > > >
> > > > Message -----
> > > > From: "Tesla list" <tesla-at-pupman-dot-com>
> > > > To: <tesla-at-pupman-dot-com>
> > > > Sent: Thursday, February 05, 2004 10:12 AM
> > > > Subject: Re: tesla virgin no more ! but need help
> > > >
> > > >
> > > > > Original poster: Mark Broker <mbroker-at-thegeekgroup-dot-org>
> > > > >
> > > > > Congrats on first light!
> > > > >
> > > > > .025uF is *way* too much cap for a 15/30! You want more like
> .008uF
> > > for a
> > > > > static gap and a 15/30. Did you retun when you removed
> capacitors?
> > > Are
> > > > > you using a Safety Spark Gap? Did you set it properly before
> > > > > operation? What type of MMC cap are you using? Brand and
model
> > will
> > > be
> > > > > great, or just type of dielectric will suffice. Where on the
> caps
> > are
> > > the
> > > > > holes/failures located?
> > > > >
> > > > > My first MMC used 11 caps per string of 1600VDC caps. No
> problems
> > > there
> > > > > despite shorting the MOVs in a "Terry Filter...."
> > > > >
> > > > > So I, too, think that your MMC is probably suspect. Answers
to
> > these
> > > > > questions will help us determine what's going on.
> > > > >
> > > > > Cheers,
> > > > >
> > > > > Mark Broker
> > > > > Chief Engineer, The Geek Group
> > > > >
> > > > >
> > > > > On Wed, 04 Feb 2004 18:07:59 -0700, Tesla list
<tesla-at-pupman-dot-com>
> > > wrote:
> > > > >
> > > > > >Original poster: "steven hyman" <steve502-at-bellsouth-dot-net> I
have
> > been
> > > > > >building my first coil (Researched this lists archives for
over
> a
> > > month
> > > > > >,along with all the websites Thanks), and had first sparks
> > > > > >on Saturday WOW!!!, about 15 inches, but having some
problems,
> I
> > > cannot
> > > > > >figure out, and need some expert advise
> > > > > >
> > > > > > Spark gap , static type with 6 ,1" diameter x2" long
copper
> > pipes
> > > > > > laid out flat, gap spacing about 1mm with fan
> > > > > >. MMC with 2 strings 12 each string(24total of 1600kv .15uf
> > > poly's.Total
> > > > > >value .025 uf ??? ( can someone check this)
> > > > > > I am presently powering this coil with 15/30 NST
> > > > > >
> > > > > >first light was great, ran the coil 10-15 short runs 12-24
inch
> > > > > >sparks. Then the spark gap would only fire for about a
second
> > and
> > > > stop,
> > > > > >after inspecting the MMC realized I had burned 2 caps up (
big
> > holes
> > > in
> > > > > >two caps together in series), I replaced these caps, and
added 3
> > more
> > > per
> > > > > >string( now qty 15- .15uf 1600kv each per string x 2
strings))
> but
> > > same
> > > > > >problem, after some evals, my present situation remains the
> same ,
> > if
> > > I
> > > > > >remove the parallel connection between the 2 strings of 15
caps,
> > and
> > > use
> > > > > >each string alone, the gap fires ( but no sparks from top
> load( I
> > can
> > > get
> > > > > >spark from topload with breakout), but if I reconnect the 2
> strings
> > of
> > > > > >caps , same problem, gap only fires for about a second or
two,
> and
> > > > > >nothing, I have tried the coil using a smaller NST (9/30 )
and
> > the
> > > coil
> > > > > >works well all components working with about 15" sparks.
> > > > > >
> > > > > >4" secondary 1050 turns ,24awg, 21.5 " coil length
> > > > > >12 turn primary 1/4 od, 1/4 spacing( tuned at about 7 turns)
> > > > > >
> > > > > >I suspect the MMC configuration, but cannot figure this out
!!
> I
> > > thought
> > > > > >15 x1600kv caps would suffice for a 15/30 nst (15 x 1600=24kv
> > > > > >any help would be greatly appreciated
> > > > > >
> > > > > >Steve
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
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