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mar-94.txt



  Date: 03-06-94 10:27
  From: Dave Halliday            
    To: Richard Quick           
  Subj: 10KVA Tesla Coil
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RQ>Dave,

RQ>We have apparently been having some problems on the SLUG-BBS
  >in the last week or so. Though I don't think I have missed
  >anything important, I did want you to know that I am locally   
  >here on the CINDEX BBS.

Hmmm...  I might call there then.

RQ>I have tried to contact our SLUG board sysops without success.

I just received notice today that my account was re-upped with no
expiration date so until I get the dish up and running ( dish is
running fine, it is getting FrontDoor & WildMail configured that
is giving me the willies ) I will be getting FIDO from here.

RQ>I did receive your post about the new power control cabinet,
  >and the 24 VAC control relays etc.. Sounds like you are moving
  >along well with this critcal phase of the project.

Yeah - my plan is to build this control unit so that it will be
able to run *any* coil that I build in the future, not just the
one I am working on now.

The box came with a nice round-type key switch, I will have that
be the primary on/off switch for the power to the coil. I am
looking at having a time delay so the procedure to fire would be
1)-main power on, there will then be a ten second delay during
which I have to hit three buttons in sequence.  During this time,
the position of the powerstat is being checked ( there are
microswitches located at the zero position ) and the powerstat is
then run down to zero if it isn't there already )

Once the third button is pressed, then the control paddle becomes
active with up and down buttons as well as a kill button.  There
was a nice big mushroom type button on the box and I will have
that set up as a kill button too.

I am going to be using a simple industrial micro to handle the
timing and logic so changing things around will be just a matter
of blowing a new eprom and not hassling with a bunch of wiring. I
will be using the existing power supplies and the relay board
though - great windfall!

Anyway, I should have that finished by next weekend and I am
looking at firing it up a few weeks after that ( still have to do
the primary and the base but I have all the supplies now ).

RQ>Good luck! I hope to hear from you again soon.

I will be sure to keep you posted!

  QMPro 1.51  Radioactive halibut will make fission chips...
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  Date: 03-01-94 11:11
  From: Dave Halliday               
    To: Richard Quick                       
  Subj: 10KVA Tesla Coil
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Hi Richard!

RQ> DH> The satellite also carries the complete FIDO NA backbone

RQ>Cool, Sometimes depending on someone else's BBS can really be
  >a pain.

So true - the satellite took a fair bit of time to set up -
integrating all the other software packages that I need to bring
the stuff into my BBS's databases - but it seems to be working
flawlessly now. Definitely the way to go!!!  Plus, it is a nice
thing to see the dish right above the stores front door - adds a
bit of technical panache to the joint!

RQ> DH> I was down at Boeing surplus last tuesday and picked up a
  > DH> wonderful metal box for the control circuitry...

RQ>That sounds like just the perfect cabinet for the job. That
  >you were also able to pick up control circuitry in the deal is 
  >a real plus.

Yeah - I was on my weekly cruise through there ( a major supplier
is located about two miles away so I can make a legitimate excuse
for going there weekly ) <grin> and when I saw that, there was
not even a moment of thought.  It will be perfect.  I had been
planning anyway to build a wall-mounted control box and use a
remote "paddle" controller because the place where I will be
firing it ( my garage ) is also my workshop and floor space is
quite a premium.

RQ> DH> I have it at the store and will be assembling the control
  > DH> circuitry. Harry Goldman sent me a nice logo to stick on
  > DH> it ( along with two years back issues of TCBA news that   
  > DH> I'd ordered )

RQ>Every TCBA member needs a good sticker for the front on the
  >control cabinet! The job just wouldn't be complete without
  >one.

I also have a bumper sticker that I proudly display at the store.
My TCBA certificate is on the wall there too.

RQ> DH> I have everything else pretty much ready - I still need
  > DH> to build the primary. I have some plywood and a whole     
  > DH> bunch of plexi scraps and 100 feet of 3/8ths copper       
  > DH> refrigeration tubing so that should go together pretty    
  > DH> easily.

RQ>Sounds like all you need to do is spend another day on this.
  >Those coiling days sure can add up. We call the 14 hour
  >marathons essential to completing a project such as this.      
  >Figure about 8 of those 14 hour marathons to completion. The   
  >bonus is that much of the work will never have to be upgraded  
  >if it is built soild enough for medium-high powered operation  
  >in the first place.

This is true - the times I got a lot of stuff done ( caps,
winding secondary, etc... ) was when I had a complete day with
nothing else calling for my attention.  I figure another one or
two of those I will be lighting up the neighborhood!

The control box, I can work on at the store, I have a small
electronics setup in a back area and I can be interrupted when
clients come in. The larger fabrication ( primary coil and base )
have to be done at home.

Anyway, I will keep you posted - TTYL - Dave

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  Date: 03-07-94 22:23
  From: Rodney Davies                         
    To: Richard Quick                         
  Subj: Tesla Coils
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Hello David, my Name is Rodney Davies of Fido 3:640/534.
I am a very fond enthusiast of Nikola Tesla and his works,
especially Tesla
Coils....

Just of recent, I received a number of documents obtained from
one of the electronic/electrical FidoNet Echoes, of an article
you posted to Brian Carling of 3:640/532, regarding Tesla Coils
etc...

Well, I was very impressed with your work and experience in this
field, and wish to know more....

I myself have constructed a few Tesla Coils, but my latest coil
has a secondary coil of 1mm enamel coated wire -at- 20 t.p.i, wound
onto a 12"diam, 2.5metre long PVC pipe - ie, it's HUGE! 

The primary circuit consists of a 15,000VAC -at- 60mA Neon Xformer,
RF Pi chokes, capacitors (actually, only one..need one more) of
0.01uf -at- 20,000V, spark gap made from three brass balls and a
primary coil of about 14" diam with about 10-12 turns of 1/4"
copper pipe...

this is what my circuit is:

                  240vac 50Hz
                               
                               
               읕컴훃UUUUUUU컴컴
                袴袴袴袴袴袴袴袴    X1
               UUUUUUUUUUUUUUUU
                              
                     賈       
                    ///        
               U||            ||U
          RFC1 U||            ||U  RFC2
               U||            ||U
               U||            ||U
                               
                               
               쳐컴컴횽  O컴컴컴 
                      G1       
                               
              컨              컨
           C1 컫  ///         컫 C2
                  錮          
                       L2     
               픘UUUUUUU컴컴컴컴
             
           曹컴훃UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU컴컴쾡 T1
                      L1

   X1 - 15,000VAC -at- 60mA Neon Transformer
   RFC1&2 - Radio Frequency Pi Wound Chokes
   G1 - Spark Gap
   C1&2 - 0.01uf -at- 20,000V Capacitors  HV Pulse discharging type
   L1 - Tesla Secondary Coil
   L2 - Tesla Primary Coil
   T1 - Discharge Terminal (10" Copper Ball water float)

   ///
   錮 = 曹컴 = Ground Return.
    

Please Note: Centre tap of Neon secondary, centre tap of Tesla
Primary, and base of secondary coil are all grounded together...

Everything to do with the coil is built and assembled, all that
is required is another 0.01uf 20,000V capacitor (oil filled
type).... What I am now asking you is, where can I get one from?

The current capacitor I have is brown in color, about 2 inches in
diam, 6 inches long, and terminals at either end...this was
retrieved from a RADAR. The manufacturer name is believed to be
"WEQO"... The other writing on the capacitor is -

0.01 MFD
20 KV DC  WKG
TYPE 4608/A
    7249
MADE IN ENGLAND

If that is of any help, I hope so....

I have much which I would like to exchange with you, and vice
versa... My Postal address is -

78 McManus Street,
Whitfield, Cairns.
4870

Ph: (070) 532018

My E-Mail addresses are -

Fido: 3:640/534

InterNet E-Mail: Rodney-at-Aerodec.anu.edu.au
                 Rodney-at-Arvidsjaur.anu.edu.au
                 Tridge-at-Nimbus.anu.edu.au      

Please get in contact with me one way or another....
There is no body in Cairns, Australia who can help me, or even
know what I'm talking about.....   

Another thing I may need is plans for a 20,000V 12.5KVA Power
supply... I saw it running a 2.5mega volt coil at our National
Science and Technology Centre in Canberra....

The final request would be, the dohnut shape used as the
discharge terminal... How are they made, and where are they
available from?

Thanks for your story, I hope you'd like to hear mine...
Please reply As soon as possible...

Kindest regards...

Rod "Tesla" Davies...  3:640/534

                             Tesla...
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  Date: 03-08-94 11:30
  From: Dave Halliday            
    To: Richard Quick               
  Subj: 10KVA Tesla Coil
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RQ>Dave,

RQ>I am glad to hear that the project continues to move along.
  >Unfortunately, the problem here with the BBS locally has
  >extended itself to a crash of my main harddrive. Took all of   
  >two days to get the crippled machine back online, and even now 
  >I am contemplating the lost data (FIDO archives). What a mess.

OUCH!  I have been archiving the messages here and would be happy
to send a disk if that would help...  They are not in perfect
order but they are at least (mostly) there...

RQ>Of course the machine was so reliable that I loaned out my
  >tape backup (NEVER AGAIN!) and my last full backup was over    
  >four months old. Figure it out.....

So true... I had a software caused ( sysop error ) loss of data
on my BBS.  All of the databases and file areas and such were
backed up but all of my utility programs and doors were not.  I
had to scramble to find a few of the registration key files -
they are now filed in a very organized manner...  <smile>

Anyway, work progresses - I have the circuitry roughed out for
the control box and am hacking away on the control program.  Was
thinking about making a PCB design and offering it as a kit to
other builders - maybe add some bells and whistles...

TTYL - Dave

RQ>... What I miss most now is my tagline file!!!!

Take one of mine!
-!-
  QMPro 1.51  picaboo: one trillionth of a surprise...
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   Date: 03-11-94 17:23
  From: Ron Beam                      
    To: Richard Quick                 
  Subj: 10KVA Tesla Coil
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On Feb 23 17:19 94, Richard Quick of 1:100/4 wrote:

 RQ> Richard T. Quick II
 RQ> 10028 Manchester Rd.
 RQ> Suite 253
 RQ> Glendale, MO  63122

 RQ> My address is periodically posted publically in the echo, 
 RQ> but here you go anyway. I would love to send you a copy of 
 RQ> my tape. Every person who has viewed it has given it a 
 RQ> thumbs up!

Hello Richard,
I sent you a package a couple of weeks ago and was just wondering
if you had received it.  Your conversations in ELECTRONICS have
me really interested.  Thanks!

Ron

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  Date: 03-11-94 17:24
  From: Richard Quick              
    To: Rodney Davies                 
  Subj: 10KVA Tesla Coil
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->3:640/534

 RD> I myself have constructed a few Tesla Coils, but my latest
 RD> coil has a secondary coil of 1mm enamel coated wire -at- 20
 RD> t.p.i, wound onto a 12"diam, 2.5metre long PVC pipe - ie,
 RD> it's HUGE!

I calculate a resonate frequency of ~58.5 kHz.

 RD> The primary circuit consists of a 15,000VAC -at- 60mA Neon
 RD> Xformer, RF Pi chokes, capacitors (actually, only one..need
 RD> one more) of 0.01uf -at- 20,000V, spark gap made from three
 RD> brass balls and a primary coil of about 14" diam with about
 RD> 10-12 turns of 1/4" copper pipe...

Completely inadequate for a secondary coil much under 200 kHz;
with your HUGE secondary, this power supply/tank circuit will not
function.

 RD> this is what my circuit is:

                     
                     
     읕컴훃UUUUUUU컴컴
     袴袴袴袴袴袴袴袴    X1
     UUUUUUUUUUUUUUUU
                    
           賈       
          ///        
     U||            ||U
RFC1 U||            ||U  RFC2
     U||            ||U
     U||            ||U
                     
                     
     쳐컴컴횽  O컴컴컴
            G1       
                     
    컨              컨
 C1 컫  ///         컫 C2
        錮          
             L2     
     픘UUUUUUU컴컴컴컴

     曹컴훃UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU컴컴쾡 T1

 RD> X1 - 15,000VAC -at- 60mA Neon Transformer
 RD> RFC1&2 - Radio Frequency Pi Wound Chokes
 RD> G1 - Spark Gap
 RD> C1&2 - 0.01uf -at- 20,000V Capacitors  HV Pulse discharging
 RD> L1 - Tesla Secondary Coil
 RD> L2 - Tesla Primary Coil
 RD> T1 - Discharge Terminal (10" Copper Ball water float)

 RD> Please Note: Centre tap of Neon secondary, centre tap of
 RD> Tesla Primary, and base of secondary coil are all grounded
 RD> together...

This is a good circuit. Unground the primary coil and let it
float. Install some HV bypassing caps across the HV terminals
from the power supply to ground. This circuit kicks back to the
power supply something fierce; without heavy bypass caps
protecting the power supply, a neon will only last a few seconds
to a few minutes before being destroyed.

 RD> Everything to do with the coil is built and assembled, all
 RD> that is required is another 0.01uf 20,000V capacitor (oil
 RD> filled type)....

What you need are a couple of .15 or .2 uf plastic film type
pulse discharging caps, and a real power supply. No neon, or bank
of neons, is going to drive a 58 kHz secondary coil, especially
with this tank circuit and a simple three ball static gap. When
you are able to pump 6-10 KVA cont. into the tank circuit (*WE
ARE TALKING A REAL XFORMER HERE!*) with .1 -.2 uf capacitance you
will get tuned and properly powered up. BTW you also need a real
spark gap (we are talking a large high speed rotary type).

 RD> Another thing I may need is plans for a 20,000V 12.5KVA
 RD> Power supply...

I would guess so. Get a power distribution xfrmr and turn it
around backwards. Step up your line voltage to around 15-20 kv
and control it with heavy resistive and/or inductive ballast.

 RD> The final request would be, the dohnut shape used as the
 RD> discharge terminal... How are they made, and where are they
 RD> available from?

Too expensive in the size you need to buy one most likely. Buy
some flexible plastic pipe in a large diameter. Form a circle and
cover it with aluminum tape or foil. Cut a large circle of thin
plastic, cover it with foil, and fit it inside the ring.

What you really need to do is cut your secondary in half. You
will find a remarkable increase in performance, the coil will be
much easier to bring into tune, and your tank circuit
requirements will be smaller, easier, and cheaper.

This secondary, while a huge effort, is not a good design. Cut it
in half. It will be almost perfect for the point you are at.

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  Date: 03-12-94 01:35
  From: Richard Quick          
    To: Dave Halliday            
  Subj: 10KVA Tesla Coil
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->3:640/534.

To give you some more info on my recomendation to cut your
secondary in half:

Adding any discharger to the secondary further reduces the
resonate frequency. The calculated figure I gave you is for a
bare coil, and does not take into account this additional
frequency drop from added top capacitance (discharger) to the
coil.

A discharger large enough to peak this coil out will reduce the
resonate frequency below 30 kHz. This is very low, even for Tesla
coils, and requires more than a few killowatts to drive the spark
out of the large discharger.

Second, the internal capacitance of the coil will be high. This
is due to the excessive number of turns of closely wound magnet
wire. Each turn of wire causes some interturn capacitance due to
it's proximity with it's neighboring turns. The more turns the
higher the capacitance, and the lower the Q of the coil.

Third, the aspect ratio of the coil is too high. A coil of this
dimension will not couple well with the primary, and will result
in an inefficient energy transfer.

While the statement I am about to make may sound strange to you,
take it to heart: The coil will perform better cut in half, than
it every will if left in it present dimensions. Get a saw.

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  Date: 03-25-94  07:18
  From: Billy Massie           
    To: All                    
  Subj: tubes
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Thousands of tubes in stock, commercial and military, we ship
anywhere. 614-353-8357   or 1:2260/225

 ! Origin: HAM IT UP ! (1:2260/225)
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  Date: 03-27-94  09:49
  From: Ron Beam                           
    To: Richard Quick                        
  Subj: Video
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Hello Richard,
I give your video a big thumbs up.  It helps to understand your
echomail when a person can actually SEE what things are supposed
to look like.  Keep up the good work and don't fry yourself!

Thanks, Ron
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  Date: 03-29-94  21:52
  From: Ron Beam                         
    To: Richard Quick                     
  Subj: Video
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Hello Richard,
Definite thumbs up on your video.  It sure makes more sense to
see what one can only read about on a BBS.  The video did raise a
couple of questions however.  It appeared that your tesla primary
is at a 90 degree angle at the base of the secondary coil.  You
also mentioned the height to width ratio being a factor in
design.  Suppose you turned the unit on it's side. Would it be
possible to hook up another secondary coil to the other side of
the primary and make some kind of dual system?  (I really don't
know much about this stuff but it's fun to brainstorm ;) I'm just
wondering what effect different configurations would have on the
system).

Ron
 ! Origin: The Monolith BBS * Canoga Park, CA! * (818) 718-0522
(1:102/902)
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  Date: 03-27-94  11:24
  From: Richard Quick                   
    To: Ron Beam                        
  Subj: 10KVA Tesla Coil
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Ron,

You should have received your copy of the Tesla video tape by
now. Please drop me a post here and let me know what you think.

Thx
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  Date: 03-27-94  11:30
  From: Richard Quick             
    To: Jim Oliver                
  Subj: 10KVA Tesla Coil
컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴
Jim,

I am still in the process of editing your Tesla videos. It will
be a couple of days before they go out.

I was unable to match the New Zealand video specs, so you will
have to convert to your standards. In order to get you the
highest quality video for conversion I have borrowed a
professional video deck and have been pasting directly off of my
8mm master tape. Since I am sending you four hours of tape, the
direct from master editing is taking some time, please be
patient, I will mail shortly.

Thanks RQ