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Re: [TCML] Re: Tesla Digest, Vol 12, Issue 37
JAVATC will provide most all of the answers you need.
It does all the math and gives you correct design info from the start.
If you email off-list I can send you a nice design for a small coil that
runs on a standard 12 kV 30 mA or 60 mA nst.
Dr. Resonance
On Tue, Oct 28, 2008 at 8:33 PM, Jerry Boman <mdg11fbf@xxxxxxxxx> wrote:
> Subject: Newby drowning with information overload & making first post.
> Hi all, I decided to try my hand at a TC about 1.5 years ago & began to
> educate myself on the art of coiling. I joined this list a few months back
> in hopes to gain a clearer understanding of how to do what I am trying to
> do...build a TC but in the process I'm finding myself more and more
> brainblocked as the days and months go by and I'm a bit intimidated with
> posting due to my confusion with some of the more simpler things like
> plugging the correct figures into a TC calculator to get some specific
> results but I have to get on with it or forget it so I'm posting in hopes I
> can get some direction. I have probably digested close to the volume of the
> library of congress in TC information and coilers websites and projects and
> that may be part of my problem. Would be a shame to give up though as I
> already have made a nice looking 3.5 inch diameter secondary that is 21
> inches tall wound with .028 wire at 29 wraps per inch = 609 turns and have
> made a fairly good looking 16 inch diameter toroid that is 6 inches deep &
> all mounted on a nice tier like stand. It beckons me to finish it daily. I
> have a 15000 volt NST rated 30 ma for my power supply and a gaggle of caps,
> wire, connectors etc. I also have a asynchronous vacuume motor for building
> my RSG and (6) 1.25 x 3 inch copper tubes for a stationary gap. Also have
> 1/4 inch copper refr. tubing for a primary coil. The caps I have aquired
> may
> be all wrong though..not sure; at the least I think they would be ok for
> the
> line voltage protection I will need. The caps I have aquired are as
> follows:
> (1) 7500 WVDC 0.1uF oil filled, (1) 12000 VDC .1MU-F pyranol cap, (4) 2000
> VDC .25MFD caps (small appx 1.5w x 1d x 2h)(all w/ceramic type posts). Also
> have aquired (2) 100watt 750ohm wire wound resistors I thought would work
> for my power supply protection. At this point I came up with 404.0443220
> for
> the freq of my secondary but not sure thats right and I'm still unsure what
> I need for capacitance for the tank circuit. With what I have provided in
> info so far can someone help me get pointed in the right direction for what
> I need. Any help appreciated in advance. Thanks, Jerry (mdg11fbf@xxxxxxxxx
> )
>
>
> 2008/10/28 <tesla-request@xxxxxxxxxx>
>
> > Send Tesla mailing list submissions to
> > tesla@xxxxxxxxxxxxxx
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://www.pupman.com/mailman/listinfo/tesla
> > or, via email, send a message with subject or body 'help' to
> > tesla-request@xxxxxxxxxxxxxx
> >
> > You can reach the person managing the list at
> > tesla-owner@xxxxxxxxxxxxxx
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Tesla digest..."
> >
> > Today's Topics:
> >
> > 1. Re: Argon Cannon Extra Credit (Phil Rembold)
> > 2. variac (jhowson4@xxxxxxxxxxx)
> > 3. RE: variac (Richard Schmuke)
> > 4. Re: variac (bunnykiller)
> > 5. Re: variac (David Speck)
> > 6. Re: variac (Phillip Slawinski)
> > 7. Noxiuos fumes from high powered arc/JL (David Rieben)
> > 8. Re: First light, small VTTC (futuret@xxxxxxx)
> > 9. Variac (jhowson4@xxxxxxxxxxx)
> > 10. Re: Noxiuos fumes from high powered arc/JL (Phillip Slawinski)
> > 11. Re: Noxiuos fumes from high powered arc/JL (Peter Terren)
> > 12. Open Day with big TC (Peter Terren)
> > 13. R: [TCML] First light, small VTTC (mazzilli vladimiro)
> > 14. Re: Noxiuos fumes from high powered arc/JL (Yurtle Turtle)
> > 15. Re: R: [TCML] First light, small VTTC (futuret@xxxxxxx)
> > 16. Re: Javatc updated to version 11.9 (bartb)
> > 17. Re: Javatc updated to version 11.9 (bartb)
> > 18. RE: Variac (Garry neeley)
> > 19. Re: Variac (bunnykiller)
> > 20. Re: Noxiuos fumes from high powered arc/JL (DC Cox)
> >
> >
> > ---------- Forwarded message ----------
> > From: "Phil Rembold" <prembold@xxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 13:21:05 -0500
> > Subject: Re: [TCML] Argon Cannon Extra Credit
> > Jeff,
> >
> > Thanks for the nice plug, I'll pass the word to Bill ...
> >
> > --
> > Phil Rembold
> > 817-831-0998
> > TCBFW
> >
> > On Mon, Oct 27, 2008 at 12:41 AM, Jeff W. Parisse <
> workshop@xxxxxxxxxxxxx
> > >wrote:
> >
> > > TCML,
> > >
> > > I'd like to give credit where credit is due.
> > >
> > > Bill Emery Jr. did ALL the gas work for the Argon Cannon. Based on my
> > > design, he and Phil Remboldt prototyped the unit at Phil's place in
> Texas
> > > and we hooked it up for the cameras here in Hollywood.
> > >
> > > Bill Emery Jr. and Phil Remboldt are fantastic engineers, clever
> > > technicians and fun people who really kick started that project into
> high
> > > gear.
> > >
> > > Thanks guys!
> > >
> > > Jeff
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: jhowson4@xxxxxxxxxxx
> > To: tesla@xxxxxxxxxx (tesla list)
> > Date: Tue, 28 Oct 2008 20:01:34 +0000
> > Subject: [TCML] variac
> > Hey guys i just got my 22.5 amp 0-140v variac in the mail.
> > I thought that the power here in my dorm was 30 amp but no its 20 so
> > needless to say I had to get maintnence to come flip my breaker back on.
> grr
> > Is there a way I can limit the current going into it so that it would be
> > take 10-15 amps from the wall. With out taking away my ability to go
> from
> > 0-140 volts.
> >
> >
> > Thanks,
> > Jay H.
> >
> >
> > ---------- Forwarded message ----------
> > From: "Richard Schmuke" <rdj@xxxxxxxxxxxx>
> > To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 16:25:09 -0500
> > Subject: RE: [TCML] variac
> > What do you have plugged it to the Variac , does it overload the breaker
> > under load or is it a inductive load when you plug it in??
> >
> > Rich , KDØZZ
> > Disclaimer: Any errors in spelling or facts are transmission errors.
> >
> >
> >
> >
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf
> > Of jhowson4@xxxxxxxxxxx
> > Sent: Tuesday, October 28, 2008 3:02 PM
> > To: tesla list
> > Subject: [TCML] variac
> >
> > Hey guys i just got my 22.5 amp 0-140v variac in the mail.
> > I thought that the power here in my dorm was 30 amp but no its 20 so
> > needless to say I had to get maintnence to come flip my breaker back on.
> > grr
> > Is there a way I can limit the current going into it so that it would be
> > take 10-15 amps from the wall. With out taking away my ability to go
> from
> > 0-140 volts.
> >
> >
> > Thanks,
> > Jay H.
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: bunnykiller <bunnikillr@xxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 16:02:44 -0500
> > Subject: Re: [TCML] variac
> > Hey Jay...
> >
> > there are 2 possible situations going on here.
> > 1. Sometimes a power surge ( rapid current usage) occurs when power is
> > applied to a Variac of substantial size.
> > 2. The load attached to the Variac could be pulling more than 15 A. With
> > the combination of both variac and load pulling current at once is a bit
> too
> > much for the breaker.
> >
> > If you have access to the breaker ( instead of calling Maint. each time
> it
> > goes off) try setting the variac to 50% with the load NOT attached to the
> > Variac, turn on Variac, turn Variac to 0%, attach load and then bring up
> > the voltage to prefered running capacity. If that doesnt work, repeat the
> > process but at a starting point of 80-85 instead of 50.
> > And a final idea, see if one of the physics or electronics labs has
> higher
> > current sockets available.... I'd try the electronics labs first ( they
> > will more likely to want to see it and help if they can).
> >
> > Scot D
> >
> > jhowson4@xxxxxxxxxxx wrote:
> >
> > Hey guys i just got my 22.5 amp 0-140v variac in the mail. I thought
> that
> >> the power here in my dorm was 30 amp but no its 20 so needless to say I
> had
> >> to get maintnence to come flip my breaker back on. grr
> >> Is there a way I can limit the current going into it so that it would be
> >> take 10-15 amps from the wall. With out taking away my ability to go
> from
> >> 0-140 volts.
> >>
> >>
> >> Thanks,
> >> Jay H.
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >>
> >>
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: David Speck <dave@xxxxxxxxxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 16:55:41 -0500
> > Subject: Re: [TCML] variac
> > Jay,
> >
> > You should put an ammeter on the unit to see how much you are pulling.
> You
> > have to adjust your load so that it doesn't draw more than 20 amps.
> Kinda
> > like having a car that theoretically could go 120, even though you can't
> > legally drive it above 65 in most places.
> >
> > A big Variac like this can sometimes trip the breaker immediately upon
> > being powered up, even with no load on it. This is due to a residual
> > magnetic state left occasionally in the core from the last time it was
> > turned off. A way to prevent these nuisance trips is to wire a beefy 10
> ohm
> > power resistor in series with the Variac primary which is then shorted
> out
> > by a suitably rated contactor (power relay) driven by the same power
> switch
> > as the Variac. The inherent mechanical delay on the contactor armature
> > gives a few AC cycles at restricted current through the Variac and allows
> > the magnetic state of the Variac core to normalize without tripping the
> > breaker.
> > Dave
> >
> > jhowson4@xxxxxxxxxxx wrote:
> >
> >> Hey guys i just got my 22.5 amp 0-140v variac in the mail. I thought
> that
> >> the power here in my dorm was 30 amp but no its 20 so needless to say I
> had
> >> to get maintnence to come flip my breaker back on. grr
> >> Is there a way I can limit the current going into it so that it would
> be
> >> take 10-15 amps from the wall. With out taking away my ability to go
> from
> >> 0-140 volts.
> >>
> >>
> >> Thanks,
> >> Jay H.
> >>
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "Phillip Slawinski" <pslawinski@xxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 15:18:41 -0500
> > Subject: Re: [TCML] variac
> > Add a breaker that is a smaller value than 20A. In your case that will
> > probably be a 15A breaker. Some power strips have 15A breakers, maybe
> that
> > would work for you.
> >
> > On Tue, Oct 28, 2008 at 15:01, <jhowson4@xxxxxxxxxxx> wrote:
> >
> > > Hey guys i just got my 22.5 amp 0-140v variac in the mail.
> > > I thought that the power here in my dorm was 30 amp but no its 20 so
> > > needless to say I had to get maintnence to come flip my breaker back
> on.
> > grr
> > > Is there a way I can limit the current going into it so that it would
> be
> > > take 10-15 amps from the wall. With out taking away my ability to go
> > from
> > > 0-140 volts.
> > >
> > >
> > > Thanks,
> > > Jay H.
> > > _______________________________________________
> > > Tesla mailing list
> > > Tesla@xxxxxxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> > >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "David Rieben" <drieben@xxxxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 16:50:03 -0500
> > Subject: [TCML] Noxiuos fumes from high powered arc/JL
> > Hi all,
> >
> > I'm sure others have ran into this issue but I thought that
> > I would bring it up to alert relative newcomers and to re-
> > fresh the memories of us "old salts". As most of us are
> > already aware, the production of ozone (O3), along with
> > various nitrogen oxides, can become rather copius during
> > operation of Tesla coils, especially the smaller to medi-
> > um sized SGTCs or DRSSTCs. Without proper ventil-
> > lation, these gases can quickly reach toxic levels. From
> > my personal experience, the distinctive O3 odor seems to
> > actually become less noticable with higher powered SG
> > driven coils where the ground striking arcs become more
> > and more numerous and start to take on more power arc
> > characteristics than the typical purplish blue corona and
> > streamers. However, I never really gave much thought
> > to excessive toxic gas production in an improperly ventillated
> > area while just running or making large 60 hz. power arcs, like
> > in a large Jacob's ladder. Sure enough though, today while I
> > was playing around with my beloved 150 kvp, 600 mA x-ray
> > transformer, making some impressive power arcs, I began
> > to notice asthma-like symptoms with my breathing (and
> > I don't have asthma) and began to cough rather uncontrol-
> > ably. Funny thing was that I really couldn't smell any
> > O3 but I still got that feeling of inhaling too much O3.
> > Once I moved outdoors to fresh air, the symptoms went
> > away pretty promptly. I'm assuming that any electric
> > arc is going to produce some NOs, even though they may
> > not always have a detectable odor. It seems that it takes
> > longer to get over these symptoms after moving to fresh
> > air when the distinctive sharp odor of O3 is noted than it
> > did with today's "odorless" experience, though. Anyone
> > else have any more light to shead on this thread?
> >
> > David Rieben
> >
> >
> > ---------- Forwarded message ----------
> > From: futuret@xxxxxxx
> > To: tesla@xxxxxxxxxx
> > Date: Tue, 28 Oct 2008 18:33:38 -0400
> > Subject: Re: [TCML] First light, small VTTC
> > Vladi,
> >
> > There are so many factors to consider. Some tubes need more
> > feedback than others. My experiment was to test the idea
> > of using a high position for the grid coil which some folks
> > have found helpful. So far in tests with this small coil I didn't
> > see any advantage but of course this coil still needs more
> > optimizing in general.
> >
> > I used 19.7 turns on the primary I think, and the coil height
> > is about 2" of 16awg wire. The secondary is 2.5" x 8.875"
> > wound with 28awg wire for about 620 turns or so. No toroid.
> > The grid coil and primary are both 4.75" dia. The grid coil
> > uses 20 turns of 24awg magnet wire tapped at 12 turns.
> > MOT is a small 2000V unit with level shifter. Filament transformer
> > is 6.3V output, so I use a 50 ohm dropping resistor on the 120V
> > input to drop the output to 5V for the 4-125A vacuum tube.
> > The RF bypass cap is 0.001uF at 5kV mica, the grid leak cap
> > and filament bypass cap are both 0.001uF at 2.5kV.
> > No staccato.
> >
> > John
> >
> >
> > -------------------
> >
> >
> > -----Original Message-----
> > From: Vladimiro Mazzilli <V.Mazzilli@xxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Tue, 28 Oct 2008 5:07 am
> > Subject: R: [TCML] First light, small VTTC
> >
> >
> >
> > So seems better to use thin wire to have a good grid driving, but not too
> > tall
> > in order to no decrease the spark length?
> >
> > Vladi
> >
> > ----------------
> > I powered up my new small 4-125A VTTC and got 4" sparks
> > so far. They are the fuzzy type sparks. More tuning is needed.
> > I tried removing the MOT shunts, but the sparks didn't get
> > much longer so far. The tube plate gets red which is not surprising
> > for a 4-125A tube. I tied the grids together on the tube, and
> > I'm using 1500 ohms for the grid leak R. I tried 2500 ohms but
> > that gave very weak sparks. On a previous coil which used
> > a 4-250A tube, I got the same spark output with grids
> > tied together as when feeding the screen grid from a
> > dropping resistor. That coil also used a 1500 ohm grid leak resistor.
> > There is no toroid on the coil. Some tests I did in the past
> > showed that even the choice of vacuum tube type can
> > make the sparks either fuzzy or sword-like. This may suggest
> > that some parameter was not optimized for each tube.
> >
> > I did a quick experiment with a raised grid coil. Normally
> > I allow about 1/2" space between the primary and grid coil.
> > I raised the grid coil by about 3" as a test. The sparks
> > got much weaker. So I moved the grid coil tap so I used
> > 20 turns instead of 12. This increased the spark length
> > almost to what it was with the lowered grid coil. This
> > secondary is only 8.875" long, so raising the grid coil
> > by 3" is a lot for this small coil. I tried various grid
> > coil heights and generally speaking, the spark output
> > varied with the grid coil height. A higher grid coil
> > gave weaker output sparks. These results are
> > preliminary because the coil still needs more tuning.
> >
> > Cheers,
> > John
> >
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: jhowson4@xxxxxxxxxxx
> > To: tesla@xxxxxxxxxx (tesla list)
> > Date: Tue, 28 Oct 2008 22:33:30 +0000
> > Subject: [TCML] Variac
> > Ok this is attempt 3 my e-mail keeps saying that there was a sending
> error.
> > so if 3 of the same message were in fact sent i am sorry.
> >
> > Ok so i think that this so called surge is the culprit since at the time
> of
> > the breaker being blown I was trying to figure out where a weird sound
> was
> > coming from and this entailed turing it on and off. learing from my
> > mistakes i won't be doing that again... ever...
> >
> > How much current is the norm if nothing is plugged into it? If the unit
> is
> > rated for 22.5 amps why is it not pulling that much power all the time?
> >
> > How does starting the variac with it turned up help. I understand what
> you
> > want me to do but I am curious as to why it works.
> >
> > Even if the surge current was the culprit i want to be sure before I plug
> > it back in and the people start asking why stuff blew.
> >
> > Thanks,
> > Jay. H
> >
> >
> > ---------- Forwarded message ----------
> > From: "Phillip Slawinski" <pslawinski@xxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 18:36:27 -0500
> > Subject: Re: [TCML] Noxiuos fumes from high powered arc/JL
> > David,
> >
> > I've made this mistake before. I was playing with my 6" coil in the
> > garage,
> > and I ignored the smell. I left the garage with a sore throat, and
> > coughing. This was while the coil was poorly tuned, once I got the coil
> > properly tuned it stopped making so much ozone. I haven't even noticed
> an
> > ozone problem with my VTTC. That seems to produce far more NOx than
> ozone.
> > At least the NOx does not smell as terrible as Ox :)
> >
> > On Tue, Oct 28, 2008 at 16:50, David Rieben <drieben@xxxxxxxxxxx> wrote:
> >
> > > Hi all,
> > >
> > > I'm sure others have ran into this issue but I thought that
> > > I would bring it up to alert relative newcomers and to re-
> > > fresh the memories of us "old salts". As most of us are
> > > already aware, the production of ozone (O3), along with
> > > various nitrogen oxides, can become rather copius during
> > > operation of Tesla coils, especially the smaller to medi-
> > > um sized SGTCs or DRSSTCs. Without proper ventil-
> > > lation, these gases can quickly reach toxic levels. From
> > > my personal experience, the distinctive O3 odor seems to
> > > actually become less noticable with higher powered SG
> > > driven coils where the ground striking arcs become more
> > > and more numerous and start to take on more power arc
> > > characteristics than the typical purplish blue corona and
> > > streamers. However, I never really gave much thought
> > > to excessive toxic gas production in an improperly ventillated
> > > area while just running or making large 60 hz. power arcs, like
> > > in a large Jacob's ladder. Sure enough though, today while I
> > > was playing around with my beloved 150 kvp, 600 mA x-ray
> > > transformer, making some impressive power arcs, I began
> > > to notice asthma-like symptoms with my breathing (and
> > > I don't have asthma) and began to cough rather uncontrol-
> > > ably. Funny thing was that I really couldn't smell any
> > > O3 but I still got that feeling of inhaling too much O3.
> > > Once I moved outdoors to fresh air, the symptoms went
> > > away pretty promptly. I'm assuming that any electric
> > > arc is going to produce some NOs, even though they may
> > > not always have a detectable odor. It seems that it takes
> > > longer to get over these symptoms after moving to fresh
> > > air when the distinctive sharp odor of O3 is noted than it
> > > did with today's "odorless" experience, though. Anyone
> > > else have any more light to shead on this thread?
> > >
> > > David Rieben
> > > _______________________________________________
> > > Tesla mailing list
> > > Tesla@xxxxxxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> > >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "Peter Terren" <pterren@xxxxxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Wed, 29 Oct 2008 07:58:03 +0900
> > Subject: Re: [TCML] Noxiuos fumes from high powered arc/JL
> > Odour sensation fatigues rapidly so you stop smelling noxious stuff after
> a
> > short while. There are physiological processes in the body that use
> nitric
> > oxide as a local vasodilator and this is sometimes used therapeutically
> by
> > inhalation and nitrous oxide N2O is an anaesthetic agent so presumably
> > neither of these cause coughing. NO2 I am not so sure about and may be a
> > culprit. The only time I have had similar bronchospasm is with burning
> > sulphur with ? sulphur dioxide formation.
> > Fortunately I have the space and weather to run my TC's outdoors.
> > Peter
> > www.tesladownunder.com
> >
> > ----- Original Message ----- From: "David Rieben" <drieben@xxxxxxxxxxx>
> >
> >
> > ... As most of us are
> > already aware, the production of ozone (O3), along with
> > various nitrogen oxides, can become rather copius during
> > operation of Tesla coils,
> > ..... today while I
> > was playing around with my beloved 150 kvp, 600 mA x-ray
> > transformer, making some impressive power arcs, I began
> > to notice asthma-like symptoms with my breathing (and
> > I don't have asthma) and began to cough rather uncontrol-
> > ably. Funny thing was that I really couldn't smell any
> > O3 but I still got that feeling of inhaling too much O3.
> > Once I moved outdoors to fresh air, the symptoms went
> > away pretty promptly. ......
> > David Rieben
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "Peter Terren" <pterren@xxxxxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Wed, 29 Oct 2008 08:08:30 +0900
> > Subject: [TCML] Open Day with big TC
> > I had an open day attended by 70-80 people. While not a true Teslathon,
> the
> > highlight was the 18 inch Tesla coil show. That segment started with a
> demo
> > of sparks onto a fluoro, burning a string of CD's, burning some wood held
> in
> > my hand and the popular Dalek cage. After that everyone got the chance
> to
> > have their pic taken under a firing TC so there were about 30 shots of
> this.
> > I used a long exposure of 5 seconds. Initially the flash goes off to
> catch
> > the people under the TC whic is off. They then run away and I run to turn
> > the TC on for about a second. It's a nice effect and very popular with
> kids
> > of all ages.
> > I also had about 50 of my other projects on display.
> > Details and pics here.
> > http://tesladownunder.com/Tesla%20display.htm#Open08
> > Peter
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "mazzilli vladimiro" <vladmiro.mazzilli@xxxxxxxxxx>
> > To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> > Date: Wed, 29 Oct 2008 00:10:43 +0100
> > Subject: R: [TCML] First light, small VTTC
> >
> > Hi John,
> >
> > You said that the primary has 19.7 turns of 16awg wire, how method do
> > you use to tune the system? I normally use magnet wire also for the
> > primary 19awg or two or three smaller paralleled between, and I use a
> > spacer (another magnet wire of 24,26awg) that I remove at the end of
> > winding. Then I scratch the enamel on the last windings and look for the
> > best tuning. But how do you succeed with an insulated wire? I'm curious
> > for the number 19.7!!
> >
> > Cheers
> >
> > Vladi
> >
> >
> > -----Messaggio originale-----
> > Da: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Per conto
> > di futuret@xxxxxxx
> > Inviato: martedì 28 ottobre 2008 23.34
> > A: tesla@xxxxxxxxxx
> > Oggetto: Re: [TCML] First light, small VTTC
> >
> >
> > Vladi,
> >
> > There are so many factors to consider. Some tubes need more feedback
> > than others. My experiment was to test the idea of using a high
> > position for the grid coil which some folks have found helpful. So
> > far in tests with this small coil I didn't see any advantage but of
> > course this coil still needs more optimizing in general.
> >
> > I used 19.7 turns on the primary I think, and the coil height is about
> > 2" of 16awg wire. The secondary is 2.5" x 8.875" wound with 28awg wire
> > for about 620 turns or so. No toroid. The grid coil and primary are
> > both 4.75" dia. The grid coil uses 20 turns of 24awg magnet wire tapped
> > at 12 turns. MOT is a small 2000V unit with level shifter. Filament
> > transformer is 6.3V output, so I use a 50 ohm dropping resistor on the
> > 120V input to drop the output to 5V for the 4-125A vacuum tube. The RF
> > bypass cap is 0.001uF at 5kV mica, the grid leak cap and filament bypass
> > cap are both 0.001uF at 2.5kV. No staccato.
> >
> > John
> >
> >
> > -------------------
> >
> >
> > -----Original Message-----
> > From: Vladimiro Mazzilli <V.Mazzilli@xxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Tue, 28 Oct 2008 5:07 am
> > Subject: R: [TCML] First light, small VTTC
> >
> >
> >
> > So seems better to use thin wire to have a good grid driving, but not
> > too tall
> > in order to no decrease the spark length?
> >
> > Vladi
> >
> > ----------------
> > I powered up my new small 4-125A VTTC and got 4" sparks
> > so far. They are the fuzzy type sparks. More tuning is needed. I tried
> > removing the MOT shunts, but the sparks didn't get much longer so far.
> > The tube plate gets red which is not surprising for a 4-125A tube. I
> > tied the grids together on the tube, and I'm using 1500 ohms for the
> > grid leak R. I tried 2500 ohms but that gave very weak sparks. On a
> > previous coil which used a 4-250A tube, I got the same spark output with
> > grids tied together as when feeding the screen grid from a dropping
> > resistor. That coil also used a 1500 ohm grid leak resistor. There is
> > no toroid on the coil. Some tests I did in the past showed that even
> > the choice of vacuum tube type can make the sparks either fuzzy or
> > sword-like. This may suggest that some parameter was not optimized for
> > each tube.
> >
> > I did a quick experiment with a raised grid coil. Normally
> > I allow about 1/2" space between the primary and grid coil.
> > I raised the grid coil by about 3" as a test. The sparks
> > got much weaker. So I moved the grid coil tap so I used
> > 20 turns instead of 12. This increased the spark length
> > almost to what it was with the lowered grid coil. This secondary is
> > only 8.875" long, so raising the grid coil by 3" is a lot for this small
> > coil. I tried various grid coil heights and generally speaking, the
> > spark output varied with the grid coil height. A higher grid coil gave
> > weaker output sparks. These results are preliminary because the coil
> > still needs more tuning.
> >
> > Cheers,
> > John
> >
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 15:16:42 -0700 (PDT)
> > Subject: Re: [TCML] Noxiuos fumes from high powered arc/JL
> > Only that NOx can form nitric acid in your moist nose and lungs.
> >
> > More info here: http://en.wikipedia.org/wiki/Nitrogen_oxide
> >
> >
> > --- On Tue, 10/28/08, David Rieben <drieben@xxxxxxxxxxx> wrote:
> >
> > > From: David Rieben <drieben@xxxxxxxxxxx>
> > > Subject: [TCML] Noxiuos fumes from high powered arc/JL
> > > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > > Date: Tuesday, October 28, 2008, 4:50 PM
> > > Hi all,
> > >
> > > I'm sure others have ran into this issue but I thought
> > > that
> > > I would bring it up to alert relative newcomers and to re-
> > > fresh the memories of us "old salts". As most of
> > > us are
> > > already aware, the production of ozone (O3), along with
> > > various nitrogen oxides, can become rather copius during
> > > operation of Tesla coils, especially the smaller to medi-
> > > um sized SGTCs or DRSSTCs. Without proper ventil-
> > > lation, these gases can quickly reach toxic levels. From
> > > my personal experience, the distinctive O3 odor seems to
> > > actually become less noticable with higher powered SG
> > > driven coils where the ground striking arcs become more
> > > and more numerous and start to take on more power arc
> > > characteristics than the typical purplish blue corona and
> > > streamers. However, I never really gave much thought
> > > to excessive toxic gas production in an improperly
> > > ventillated
> > > area while just running or making large 60 hz. power arcs,
> > > like
> > > in a large Jacob's ladder. Sure enough though, today
> > > while I
> > > was playing around with my beloved 150 kvp, 600 mA x-ray
> > > transformer, making some impressive power arcs, I began
> > > to notice asthma-like symptoms with my breathing (and
> > > I don't have asthma) and began to cough rather
> > > uncontrol-
> > > ably. Funny thing was that I really couldn't smell any
> > > O3 but I still got that feeling of inhaling too much O3.
> > > Once I moved outdoors to fresh air, the symptoms went
> > > away pretty promptly. I'm assuming that any electric
> > > arc is going to produce some NOs, even though they may
> > > not always have a detectable odor. It seems that it takes
> > > longer to get over these symptoms after moving to fresh
> > > air when the distinctive sharp odor of O3 is noted than it
> > > did with today's "odorless" experience,
> > > though. Anyone
> > > else have any more light to shead on this thread?
> > >
> > > David Rieben
> > > _______________________________________________
> > > Tesla mailing list
> > > Tesla@xxxxxxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> >
> >
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: futuret@xxxxxxx
> > To: tesla@xxxxxxxxxx
> > Date: Tue, 28 Oct 2008 20:16:34 -0400
> > Subject: Re: R: [TCML] First light, small VTTC
> >
> > Hi Vladi,
> >
> > I cannot tune this primary. I tune using the capacitor. I probably
> > should have made some taps or something, but I made it fixed at
> > 19.7 turns. I just picked what I thought would be a good figure
> > based on a reasonable tank Q. The primary wire is PVC insulated
> > wire. It's 19.7 to make it convenient to connect to the capacitor
> > from a physical layout standpoint. My reasoning was that anywhere
> > from 18 to 21 turns would give similar performance as long as
> > the system is tuned OK with the capacitor. I added a variable
> > cap to fine tune the system. Possibly I have to add another
> > fixed cap or something because the performance is rather wimpy.
> > I may not have enough tuning range. When I turn up the power,
> > the spark reaches a certain length then plateaus, so I probably
> > need more tank capacitance.
> > I tried installing a 4-400A tube and it didn't help the performance
> > much, so I suspect a tuning issue.
> > However I know this 4-400A tube is somewhat defective (weak).
> > The secondary resonant frequency is about 1Mhz.
> >
> > John
> > ----------
> >
> > -----Original Message-----
> > From: mazzilli vladimiro <vladmiro.mazzilli@xxxxxxxxxx>
> > To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx>
> > Sent: Tue, 28 Oct 2008 7:10 pm
> > Subject: R: [TCML] First light, small VTTC
> >
> >
> >
> > Hi John,
> >
> > You said that the primary has 19.7 turns of 16awg wire, how method do
> > you use to tune the system? I normally use magnet wire also for the
> > primary 19awg or two or three smaller paralleled between, and I use a
> > spacer (another magnet wire of 24,26awg) that I remove at the end of
> > winding. Then I scratch the enamel on the last windings and look for the
> > best tuning. But how do you succeed with an insulated wire? I'm curious
> > for the number 19.7!!
> >
> > Cheers
> >
> > Vladi
> >
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: bartb <bartb@xxxxxxxxxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 18:04:24 -0700
> > Subject: Re: [TCML] Javatc updated to version 11.9
> > Hi Scot,
> >
> > For the rotary, I use no arc voltage equations since it is a timing
> > function. Rounded electrodes will get a little closer to alignment before
> > firing than flat electrodes will. The flat electrode approaching sides
> will
> > arc sooner. But this is no big deal as even rounded electrodes do this
> also,
> > but only to a slightly lesser degree depending on size and curvature. I
> > think rounded electrodes will last longer for the same power level since
> hot
> > spots should be lessened due to the mass at the edge. This is probably
> the
> > main benefit of rounding the electrodes. Performance won't change between
> > the two, just edge life.
> >
> > I rounded the tungsten electrodes on my rotary. I placed the rod in a
> drill
> > and spun the end on a large file moving the drill from 90 degress down to
> > almost horizontal until I got a decent rounding. Then spun the electrode
> in
> > stainless steel to polish up the end. Worked great and easier than I
> thought
> > it was going to be (still a lot of work).
> >
> > Take care,
> > Bart
> >
> > bunnykiller wrote:
> >
> >> Hey Bart...
> >>
> >> I have been using the online version of the Javatc alot in tha last few
> >> days crunching numbers for my next coil and noticed that in the static
> gap
> >> area there is the option of flat vs. round electrodes and how it makes a
> >> serious difference in arc propigation distances. My question is.... on
> >> rotory gaps, does the usage of flat geometries as opposed to rounded
> >> electrodes make a difference too?? Seems that with flat electrodes in a
> >> rotory gap system would be prone to "pre-alignment of the electrode arc
> >> jumping" to some degree. It definately showed up on my gap system ;)
> >>
> >> BTW... XP and Firefox 3.0 combination running JavaTC will shut down
> >> Firefox completely on my computer.
> >>
> >> Scot D
> >>
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: bartb <bartb@xxxxxxxxxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 18:16:00 -0700
> > Subject: Re: [TCML] Javatc updated to version 11.9
> > Hi Scott,
> >
> > Yep, Firefox 3.0.3 is fast. I stopped using Netscape a long time ago when
> > version 6 came around (lazy and slow). IE6 did best up until Firefox came
> > along. Now Firefox is about 3 times faster than IE.
> >
> > The VI distribution should run ok. It will first show a set of voltages
> > with a base current of 1 amp. But it isn't finished at that point. It
> > basically performed a low detail run to provide the base current and some
> > inductances and it then continues a second run inserting this new base
> > current. This final run increases the detail for a larger number of data
> > points along the length of the coil and will replace the first set of
> > numbers with more realistic values. At that point, it's done. Takes about
> 1
> > or 2 minutes of crunching time.
> >
> > Take care,
> > Bart
> >
> > bunnykiller wrote:
> >
> >> Hey Bart...
> >>
> >> Back again, I downloaded Firefox 3.0.3 and retried JavaTC works very
> nice
> >> and quick... alot faster than Netscape 7.0, 8.0 and Flock.
> >>
> >> Firefox 3.0.3 crunches the numbers in about 3-5 seconds as compared to
> the
> >> 20 - 30 seconds for the Netscapes and Flock.
> >> Didnt try the secondary voltage run...
> >>
> >> Scot D
> >>
> >>
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >>
> >
> >
> > ---------- Forwarded message ----------
> > From: Garry neeley <bamacoiler@xxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 20:24:22 -0500
> > Subject: RE: [TCML] Variac
> > Philip suggested that yopu add a 15a breaker, I agree. If you wire a
> > breaker in series with the primary the breaker you add should trip before
> > the one in the panel and you should be safe.
> > Garry Neeley
> >
> > -----Original Message-----
> > From: jhowson4@xxxxxxxxxxx
> > Sent: Tuesday, October 28, 2008 5:33 PM
> > To: tesla list <tesla@xxxxxxxxxx>
> > Subject: [TCML] Variac
> >
> > Ok this is attempt 3 my e-mail keeps saying that there was a sending
> error.
> > so if 3 of the same message were in fact sent i am sorry.
> >
> > Ok so i think that this so called surge is the culprit since at the time
> of
> > the breaker being blown I was trying to figure out where a weird sound
> was
> > coming from and this entailed turing it on and off. learing from my
> > mistakes i won't be doing that again... ever...
> >
> > How much current is the norm if nothing is plugged into it? If the unit
> is
> > rated for 22.5 amps why is it not pulling that much power all the time?
> >
> > How does starting the variac with it turned up help. I understand what
> you
> > want me to do but I am curious as to why it works.
> >
> > Even if the surge current was the culprit i want to be sure before I plug
> > it back in and the people start asking why stuff blew.
> >
> > Thanks,
> > Jay. H
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: bunnykiller <bunnikillr@xxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 20:08:00 -0500
> > Subject: Re: [TCML] Variac
> > Hey Jay...
> >
> > having the wiper somewhat in the middle of the windings seems to reduce
> the
> > initial magnetic flux thru the core of the variac. Depending on how you
> have
> > the Variac wired for output, it can be a healthy inital surge. If wired
> for
> > say line voltage in and line voltage out at max rating, the surge is
> almost
> > minimal when starting( turning on) the variac at full voltage since the
> > wiper is at the end of the windings with little magnetic field flux being
> > produced. If you have it wired for 120 in and 140 out at max settings,
> there
> > is going to be the inital magnetic flux incurred to give you the 140 V
> out.
> >
> > The unit is rated for 22.5 amps current capacity, in other words it will
> > handle a current of 22.5 amps max thru it to the load it is supplying. If
> > you were to put a load on the variac that can draw more than 23 amps, the
> > Variac will overheat and smoke and eventually die... most of the times,
> > variac failure occurs where the wiper ( brush) is in contact with the
> > windings, either the brush arcs out or the windings melt and break.
> >
> > Just wondering.... how do you have the variac wired up???? Did it come
> > with a prewired wall plug attached, or did you have to put one on
> yourself?
> > What brand is the Variac??
> > Scot D
> >
> >
> > jhowson4@xxxxxxxxxxx wrote:
> >
> > Ok this is attempt 3 my e-mail keeps saying that there was a sending
> >> error. so if 3 of the same message were in fact sent i am sorry.
> >>
> >> Ok so i think that this so called surge is the culprit since at the time
> >> of the breaker being blown I was trying to figure out where a weird
> sound
> >> was coming from and this entailed turing it on and off. learing from my
> >> mistakes i won't be doing that again... ever...
> >>
> >> How much current is the norm if nothing is plugged into it? If the unit
> is
> >> rated for 22.5 amps why is it not pulling that much power all the time?
> >>
> >> How does starting the variac with it turned up help. I understand what
> >> you want me to do but I am curious as to why it works.
> >>
> >> Even if the surge current was the culprit i want to be sure before I
> plug
> >> it back in and the people start asking why stuff blew.
> >>
> >> Thanks, Jay. H
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >>
> >>
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "DC Cox" <resonance@xxxxxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Tue, 28 Oct 2008 18:05:53 -0700
> > Subject: Re: [TCML] Noxiuos fumes from high powered arc/JL
> > I've always said one has to be very careful using Tesla coils in
> apartment
> > rooms, basements, closed garages, and other closed up or partially
> enclosed
> > areas.
> >
> > I first experienced very similar experiences in 1962 - 1965 running coils
> > in
> > my basement without good ventilation. O3 is also considered
> carcinogenic,
> > so long term
> > effects have not been carefully studied.
> >
> > Solid state and IGBT type coils are much more efficient and dump much
> > higher
> > currents into the secondary inductor thus increasing the O3 effects.
> >
> > Use caution and stay healthy. If you have to run in an enclosed area,
> > consider short operational periods of 10-15 sec, then use a fan to blast
> > any
> > O3 out a nearby window.
> >
> > Dr. Resonance
> >
> >
> >
> >
> > On Tue, Oct 28, 2008 at 2:50 PM, David Rieben <drieben@xxxxxxxxxxx>
> wrote:
> >
> > > Hi all,
> > >
> > > I'm sure others have ran into this issue but I thought that
> > > I would bring it up to alert relative newcomers and to re-
> > > fresh the memories of us "old salts". As most of us are
> > > already aware, the production of ozone (O3), along with
> > > various nitrogen oxides, can become rather copius during
> > > operation of Tesla coils, especially the smaller to medi-
> > > um sized SGTCs or DRSSTCs. Without proper ventil-
> > > lation, these gases can quickly reach toxic levels. From
> > > my personal experience, the distinctive O3 odor seems to
> > > actually become less noticable with higher powered SG
> > > driven coils where the ground striking arcs become more
> > > and more numerous and start to take on more power arc
> > > characteristics than the typical purplish blue corona and
> > > streamers. However, I never really gave much thought
> > > to excessive toxic gas production in an improperly ventillated
> > > area while just running or making large 60 hz. power arcs, like
> > > in a large Jacob's ladder. Sure enough though, today while I
> > > was playing around with my beloved 150 kvp, 600 mA x-ray
> > > transformer, making some impressive power arcs, I began
> > > to notice asthma-like symptoms with my breathing (and
> > > I don't have asthma) and began to cough rather uncontrol-
> > > ably. Funny thing was that I really couldn't smell any
> > > O3 but I still got that feeling of inhaling too much O3.
> > > Once I moved outdoors to fresh air, the symptoms went
> > > away pretty promptly. I'm assuming that any electric
> > > arc is going to produce some NOs, even though they may
> > > not always have a detectable odor. It seems that it takes
> > > longer to get over these symptoms after moving to fresh
> > > air when the distinctive sharp odor of O3 is noted than it
> > > did with today's "odorless" experience, though. Anyone
> > > else have any more light to shead on this thread?
> > >
> > > David Rieben
> > > _______________________________________________
> > > Tesla mailing list
> > > Tesla@xxxxxxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> > >
> >
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> >
>
>
> --
> "FREEDOM"=The result of intention and action against tyranny. "Live Free -
> Be Free"
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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