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DIY Plasma Gun
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Tesla CoilA Hand Held Tesla Coil
Battery Powered 'Plasma Gun'

The design for this Tesla Coil is based on the larger DIY Tesla Coil project but with the aim of getting a much smaller and portable device. A Power Pulse Modulator circuit is used to drive two small high voltage ignition coils wired together in an 'anti-parralel' configuration. The output is rectified and used to charge the tank capacitor of a small spark gap Tesla Coil.

Tesla Coil ligting an odinary light bulb

The device is packed into the casing of chepo £10 cordless drill from B&Q. This drill used a 12V battery and comes with a charger which made it ideal for the project. The ignition coil driver circuit used takes a direct 12V input which is connected using the original switch from the drill.

This video clip shows the plasma gun causing a nearby light bulb to light up as if it were a plasma globe.

The high frequency, high voltage from the plasma gun causes the Argon gas in the light bulb to become ionized. This creates streamers that are attracted to the fingers holding it.

The device draws about 6 amps from a well charged battery which makes the total power consumption to around 72 watts. Unfortunately this low power means the plasma arcs will be limited in size, but since it is hand held that's probably a good thing. The typical length of the output arcs is between 5 and 7cm.

Hand Held Tesla Coil

Such a small Tesla Coil inherently has quite a high resonant frequency which in this case is about 500 MHz. This frequency is too high to feel as electric shock but when being zapped you can feel the low frequency component of the spark gap firing rate.

Mini Tesla Coil Schematic

PARTS LIST
 
PWM-OC10A Drive Circuit  
SW1 Trigger Switch  
Spark Coil 1 & 2 Small Ignition Coils  
D1 15kV Diode x 4  
C1 1nF 15kV  
C2 2nF 15kV  
C3 Topload Sphere  
L1 RF Choke 10uH  
L2 RF Choke 10uH  
L3 TC Primary Coil  
L4 TC Secondary Coil  
Input Voltage 12 VDC  
Power Consumption 75W Max  
Max Arc Length

5cm (in air)
7cm (with gas)

 
Output Voltage (approx) 50kV  
Primary Transformer 2 x small ignition coils < 20kV  
Spark Gap Sealed Static gap. ~4mm  
Primary Turns
Primary Diameter
Primary Inductance
5
70 mm
1 uH
 
Secondary Turns
Secondary Height
Secondary Diameter
Secondary Inductance
Secondary Resistance
520
135 mm
26 mm
900 uH
10 ohms
 
Topload 32 mm Sphere  
Special Features

Hand Held
Portable
Battery Powered
Trigger Activated
Plasma / Flame discharge

 

The main driving circuit is a type of pulse width modulation circuit with protection against high voltage spikes. It is adjusted to get the maximum output from the two ignition coils.

The two ignition coils were stripped of the casing in order to reduce the overall size and allow access to the internal wiring. The inputs are wired in an anti-parallel arrangement to help keep the charging voltage high when under load.

The HV outputs of the spark coils are connected to a rectifier (D1) made from four HV diodes potted in epoxy resin. Connected to this is a small smoothing capacitor (C1) which helps to reduce the ripple in the HV DC output. The tank capacitor (C2) is charged from the HV DC supply via two RF chokes (inductors L1 & L2) which serve to prevent the RF oscillations of the TC primary circuit from interfering with the rest of the circuit.

The previous battery powered tesla coil design needed to be well connected to a good RF ground such as a metal rod in the earth. Without this the output would be limited and the driver circuit would be prone to failure.

Copper grounding pad on handleWith this mini tesla coil the RF ground connection is made by connecting it to a copper pad on the handle.

The body of the person holding the device is used as the RF ground and the large area of copper ensures the energy is spread out to prevent RF burns.

In most Tesla Coils this would not be safe at all but this device is very low power so there is little risk of electric shock. The RF its self probably isn't too healthy though!

The TC part (Tesla Coil) uses the common single static spark gap and flat primary design for simplicity and size. The primary coil is closely wound around the base of the secondary with several layers of insulation tape preventing flashover.

Plasma Gun

The topload sphere is made from a metal draw handle which has been drilled to allow gas to be ejected from the end. A pipe from this sphere runs down the inside of the secondary and to the back of the handle where it can be connected to a gas supply.

Using noble gasses such as Argon or Neon will cause the output arcs to be forced along the flow of gas. This allows the plasma to be directed in a straight line from the tip of the plasma gun. It is also possible to use butane gas which makes this thing into some kind of flamethrower - plasma gun hybrid. The electricity is conducted along the flame from its tip. You can see photos of this effect on our plasma page.

Wirless Plasma GlobeApart from making cool arcs of plasma, this device even transmits wireless electrical power. It can light bulbs and fluorescent lights just from being nearby.

The interference created by this wireless energy can cause all sorts of electronic devices to switch on and off or start behaving erratically. This is because the energy is causing tiny currents to be induced in the tracks and wires in the devices. If a simple circuit had a matching resonant frequency to that of the plasma gun, it would be possible to collect the wireless energy from a greater distance.

There are several improvements that could be made on this design which could result in a greater power throughput and therefore bigger arcs.

Firing Argon from the Tip

The spark gap is just a single gap which has been seal inside a plastic case for safety and size. This sort of switching will have poor performance due to quenching difficulties and oxide buildup. A solid state version would be better but it would likely be larger and considerably more expensive.
A larger topload would allow for larger breakouts, but it would also need more primary capacitance. The secondary coil is also rather long relative to its width. Ideally this would be shorter and wider.

In conclusion this was a fun project and we hope you find this information useful and interesting.

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Questions and Comments on the Mini Tesla Coil Gun

Some comments/questions are hidden. To include them below, click here
The information provided here can not be guaranteed as accurate or correct. Always check with an alternate source before following any suggestions made here.
RahulMonday, 23rd July 2007 4:13pm - No.1494
hey man what if i cant get a drill machine
 
RMCyberneticsMonday, 23rd July 2007 4:18pm - No.1495
The drill is not important. It just serves as a box, a switch and a battery.
 
ChrisHTuesday, 24th July 2007 12:08pm - No.1497
I would like to know two things about your new project.
1) Where does one obtain the HV diodes rated at 15kV...do you know if RS components do these or is there an alternative source from old equipment?
2)Is the final tank capacitor a single capacitor or an MMC? I assume it's the former.
 
RMCyberneticsWednesday, 25th July 2007 1:10pm - No.1500
RS seem to be discontinuing the HV diodes they used to sell. You can buy High Voltage Diodes from our surplus store.

The tank cap is just two identical caps in parallel.
 
JimVMonday, 6th August 2007 2:46pm - No.1541
High voltage diodes and capacitors can be scrounged from an old TV set or computer monitor. Large color sets put out 25 KV or so. And the power supplies can be used for other projects too..Just BE CAREFUL cuz that kind of stored energy can kill you!
 
PantherMonday, 6th August 2007 5:10pm - No.1542
No offense but... This looks like a sex toy of some sort. Like its supposed to make a super erotic sensation.
 
RMCyberneticsMonday, 6th August 2007 5:13pm - No.1543
lol. None taken. I think that just says a little something about how your mind works!
 
leonThursday, 9th August 2007 4:48pm - No.1556
how did you learn of this, damn, your good, real good
 
KeithThursday, 9th August 2007 6:28pm - No.1557
Dude, This is pure class. Good to see your making it on hackaday website.
Should make it so you can fire ionised gas out of it so the sparks can go better.
 
RMCyberneticsThursday, 9th August 2007 9:51pm - No.1558
Hey there keef, glad you like it. The bottom picture is supposed to show Argon being fired from the end. Unfortunately my digital camera is pretty rubbish for this sort of thing. I'll get some better ones with my SLR at some point.
It works well using Neon too, bright red. If it's forced out through a tiny opening it will make a long straight needle like plasma jet.
 
CervetesFriday, 10th August 2007 12:02am - No.1562
"The body of the person holding the device is used as the RF ground and the large area of copper ensures the energy is spread out to prevent RF burns."

Possible to use an RF antenna 'dummy load' here instead? (Just in case somone wanted to up the power)
 
MikeFriday, 10th August 2007 1:44am - No.1563
Hi there. You all have some great projects -- great ingenuity! I have 2 questions:
(1) Is the gas line neccessary, or only for the purpose of emitting streamers from the end of the "gun" itself?
(2) What would you estimate the total cost of the project to be?
Thanks, and good job!
 
RMCyberneticsFriday, 10th August 2007 11:44am - No.1565
The gas line is not necessary. It is just an added extra for directing the plasma out in a straight line. Without gas flow, the streamers will just look like those from a normal Tesla coil.
Rough costings as follows;
Cordless Drill - £10
Drive Circuit - £40
2x Spark Coils - £30
4x Diodes - £8
3x Capacitors - £5
RF Chokes - £1
Topload Sphere - £3
Coils & Former - £5
Spark Gap - £3
Time to Build - Priceless
TOTAL £105

That's buying everything new, you could probably lower the cost by using salvaged parts and also using the PWMOC10A kit instead of the ready made ones.
 
SteffanFriday, 10th August 2007 3:42pm - No.1568
How is this circuit different from a '20's vintage Violet Ray wand?
 
RMCyberneticsFriday, 10th August 2007 3:47pm - No.1569
Higher power, and it runs from batteries. This ciruit uses transistors and compact coils to 'invert' the DC into HV AC for charging the tank capacitor. It also hase the gas jet feature.
 
NickSaturday, 11th August 2007 4:37am - No.1571
Does this cause any harmful effects to people?
 
RMCyberneticsSaturday, 11th August 2007 3:48pm - No.1573
Nothing that would be immediately noticeable, but excessive exposure to any source of RF would probably not be good for you. Although the mobile phone companies would probably disagree.
 
NickSunday, 12th August 2007 3:33am - No.1577
So if I had a huge, permanent one thats alot more powerful in my room, and left it on 24-7 it could be bad for me?
 
BlakeTuesday, 14th August 2007 7:27pm - No.1588
Just be careful... telsa coils actually produce
radiation... I wouldnt
want to be exposed to that.Just look at the way Tesa and most of his
associates died...Being blasted with x-rays just because it looks
cool can really be a bad decision.

http://en.wikipedia.org/wiki/Tesla_coil
 
SantaWednesday, 15th August 2007 3:09pm - No.1595
Richard did you talk my wife into buying me an 18 Volt cordless drill for my Birthday. I never asked for a drill and now you come up with this idea. I guess the drill will have to break sometime.

Can i break it now!! ..
 
Aunt CathyThursday, 16th August 2007 3:50pm - No.1602
To make this effective, you need to apply one of those systems that rarify a column of air from the tip of the device.

Drill a hole through the ball at the top of the coil. Devise a CO2 laser of suitable wattage and compact enough to fit inside the coil's cylinder.
 
squarefish06Friday, 17th August 2007 12:09pm - No.1606
By putting a UV laser in there you might be able to generate a sustained path of ionised gas between the unit and the target. just have it fire out the hole in the topload sphere.
Set Phasers to tickle!!
 
RMCyberneticsSunday, 19th August 2007 5:20pm - No.1622

Just found this video of an amazing hand held tesla coil. It needs to be plugged in to the mains but it's certainly impressive. Well done JM Labs and teslacoil.net
 
schman-manFriday, 24th August 2007 4:30am - No.1649
what would this do to the sensors in stores by the doors?

would it make them go off?

if so, that is a fun little toy.
 
BluemotionMonday, 27th August 2007 3:32am - No.1659
About the HV diode, is 2CL77(20kv 10ma) ok?
 
RMCyberneticsMonday, 27th August 2007 11:01am - No.1661
Yes.
 
AdamThursday, 27th September 2007 3:39pm - No.1767
Is it possible to make this and still have it work without having a gas supply?
 
bdThursday, 27th September 2007 8:24pm - No.1768
What's the point of making it shaped like a gun if all you can do is light up light bulbs with it? A gun should destroy stuff!!!!
 
RMCyberneticsThursday, 27th September 2007 10:49pm - No.1771
Adam,
Yes, the plasma will just reach for grounded objects like an ordinary Tesla Coil.

bd,
Ever heard of a glue gun or a staple gun? They are used to create things, not destroy them.
 
IMThursday, 11th October 2007 10:25pm - No.1931
How hazardous is the output of this TC? What would happen if one touched the globe while it was running?
Thanks for your help.
 
RMCyberneticsFriday, 12th October 2007 1:27am - No.1933
It would tingle quite a bit. The arc jumping to a finger would possibly cause burns if left for several seconds. The RF electricity traveling through the body is probably not good for you either.
 
some personSaturday, 13th October 2007 6:54pm - No.1950
I'm planning on building a small, low Hz tesla coil, like the other guy with the handheld one. (exept not handheld) What kind of things should I use?
 
Awsome High VoltageSaturday, 20th October 2007 3:17am - No.1991
cool! what kind of lite is that?
 
RMCyberneticsSaturday, 20th October 2007 1:16pm - No.1994
An ordinary light bulb and small florescent tube were used.
 
sonjiSaturday, 27th October 2007 7:12am - No.2057
whats the pmw oscillator my family thanks you for any advice 1000 thankyous
 
RMCyberneticsSaturday, 27th October 2007 12:30pm - No.2061
It is a low voltage square wave pulse generator with protection against HV spikes.
 
boberick2Saturday, 27th October 2007 2:52pm - No.2065
i like this its given me a great idea.
get a massive can sized capacitor full of tonnes of electric like with the can crushers, and use that instead of batteries so instead of a steady thing like that you could do what the posted vid does but have to reload each shot.
 
DickTuesday, 6th November 2007 2:34am - No.2129
Ah, memories of my high school physics class. Mr. Flanagan left an insulation tester gizmo running on his lab table and left the room momentarily with the warning "this thing's hot, so don't anybody touch it". Of course, the class machos all checked it out. It resembled a soldering iron to the extent that it was line powered and had a bluntly tipped metal probe, but the handle was big enough for two people to hold with both hands. It could throw a spark about 2 inches and if you were the sparkee you wouldn't be inclined to try it again. It was our physics teacher's most memorable practical joke.
 
O MARKWednesday, 7th November 2007 11:34am - No.2138
THE DEVICE IS SIMILAR TO RED ALERT2 TESLA TECHNOLOGY

WHAT IS THE RANGE OF IT
 
AdamThursday, 8th November 2007 4:01am - No.2145
A very interesting device, I have thought about making one myself.

I think your idea based on the classic tesla coil is good, and the working unit is excelent.

If i was to make one id try to go solid state all the way, it may give you better power efficency over the traditional spark gap method.

I would also be very tempted to construct an aditional coil and make the system like a magnifier, this will help lower the res frequency down to more manageable levels, as well as giving you more of a voltage feild.

if the frequency is low enough, you may even be able to use ferrite powder, or bits of ferrite in the center of the sec tube, to improve coupling.

Anyway I look forward to seeing more of your work
 
W S HornbakerTuesday, 13th November 2007 8:10pm - No.2177
So what's new??
I did the same thing with an old Model-T Ford ignition coil in 1937/38!
 
RMCyberneticsTuesday, 13th November 2007 9:47pm - No.2178
I doubt that very much indeed. The transistor was not invented until 1947. This device contains a power MOSFET, 2 IC's containing hundreds of transistors and rectifier diodes. The HV capacitors (condensers)here would have been impossible to make back then and an equivalent would be much larger. Even the battery stores much more energy per unit mass than would have been possible. The noble gas would have been very hard to get in 1938. Oh yes, it is also cased in this mystical substance called plastic!
 
EulacaThursday, 22nd November 2007 1:38pm - No.2203
I noticed you mentioned that argon gas was being used to create the arc in one of your pictures. Does this generate much heat, or UV light, it just seems very similar to the plasma weld TIG effect. (if it does produce any UV light you may want to avoid looking at it, as it can cause "arc eye")

Great build btw.
 
RMCyberneticsThursday, 22nd November 2007 5:49pm - No.2205
No more significant heat or light is produced by using Argon in this system. The output current used here is very very low so the plasma temperature stays relativley cool compared to a TIG. The heat/light produced will be proportional to the current flowing in the arc. This uses something less than 1mA (0.001 A) where a TIG will use around 200A.
 
wogdomTuesday, 27th November 2007 3:11am - No.2238
My son is in second year electrical eng. and wants to do a second major in physics
I am looking for Christmas ideas and wondered if I could but everything needed for this project as a kit...except the drill of course. I know nothing about this stuff and think I could easily spend a hour on this site just trying to find all the parts. It would be great if a package deal were available with basic instructions or the like. Thanks
 
RMCyberneticsWednesday, 28th November 2007 1:53pm - No.2248
The only parts we have on sale for this projects are linked in the parts list here. The coils of the Tesla Coil can easily be made by winding enameled (insulated) copper wire around a plastic tube. The actual dimensions of the coil (L4) can be different to that shown but this would mean that some other adjustments (C2 and/or L3) would need to be made to make it match. There are many variations that could be made to this project. Changing some of the parameters and observing the outcome can be a good way to learn.
 
der stromWednesday, 12th December 2007 5:13pm - No.2330
when AC voltage is full-wave rectified, does that mean that there is a steady DC voltage coming out? or is it pulsed?

thank you!
 
RMCyberneticsWednesday, 12th December 2007 6:59pm - No.2333
It is not steady if you just have diodes. You would add a big capacitor after to smooth it out (This is what C1 is for in the diagram). I posted a diagram about this somewhere for somone, but I really can't remeber where unfortunatley. If you find it let me know the page and msg number.
 
RussianBoyMonday, 31st March 2008 11:40am - No.2670
Хуясе о_о
 
owais kohatiTuesday, 1st April 2008 10:01am - No.2677
Type your message here
if i vary the voltage upto 2 times,what will be the result
 
RMCyberneticsTuesday, 1st April 2008 11:33am - No.2678
If by voltage you mean the input voltage, and if my vary you mean increase, the result would be a proportionally increased output power and faster firing rate.
 
ScottThursday, 24th April 2008 10:27am - No.2735
Couldn't you use an UV (or is it IR) diode to direct the arc instead of the noble gas?
 
RMCyberneticsSunday, 27th April 2008 11:03pm - No.2739
The UV light would have to be very intense to be able to do this effectively. The UV light its self would be quite dangerous.
 
IvanFriday, 16th May 2008 3:17am - No.2762
Hi!
My friends and I are making this for a high school chem. project and we would like to know a couple of things.

1) What are possible dangers? Are measures of safety did you take when you made this?
2) Do you know where we can get the parts other than your site (we need it soon but your shipping date is past the due date). What stores do you recommend?
3) Why a drill? Are there any parts in the drill (aside from the battery) that is critical?

Thanks!
 
RMCyberneticsTuesday, 20th May 2008 2:27pm - No.2770
Dangers are from fire, electric shock (causing you to possibly injure yourself indirectly), and interference with nearby electronic equipment.
Coils from an autospares supplier, maybe you can find other parts in a local electonics shop.
Drill just has a convinient shape, battery and switch.
 
Raiden Tesla ManWednesday, 21st May 2008 7:39pm - No.2775
Man i built one out of capacitors, couplings, copper wire,etc. but the box was a fire work box...I was wondering if you would post a version of Mr. Tesla's hand held oscillator...that would be cool thanks for pictures and all. Continue to light the world.
 
FrankThursday, 12th June 2008 11:01am - No.2814
I have seen other Tesla Coil circuits where the spark gap and the capacitor are in opposite positions to your setup. Why have you done this?
 
RMCyberneticsThursday, 12th June 2008 11:50am - No.2816
The charging current for the capacitor here is low and via some diodes. This just helps with preventing HV spikes getting back to the circuit. When charging from an AC transformer like an NST, it is not so important.
 
FrankFriday, 13th June 2008 8:41am - No.2822
Thanks. 1 more question, do you need to rectify the output?
 
FBFriday, 13th June 2008 9:07am - No.2824
I am building a Tesla Coil, and want to know if a capacitance of 0.0014 uF @ 90KV would be enough to give good results. The coil is driven by 2 Ignition coils (12V SLA powered), and has a secondary height of about 70 cm.
Thanks for your help.
 
AlexMonday, 16th June 2008 12:51am - No.2830
Where'd you get such a small top load sphere? The smallest ones I can find are 3" in diameter
 
RMCyberneticsMonday, 16th June 2008 1:05am - No.2833
Frank,
The output from the ignition coils does need to be rectified.

FB,
1.4nF is quite small and will therefore create a higher frequency resonance than a larger capacitor would. You may be able to compensate with more turns on your primary coil.
It is all about matching the resonant frequencies of the parts so you have to make your coils match the capacitor used.

Alex,
A drawer handle from a DIY store.
 
AlexMonday, 16th June 2008 1:09am - No.2834
What are the primary and secondary coils made out of?
 
RMCyberneticsMonday, 16th June 2008 1:19am - No.2838
Just some random plastic parts from old toys or anything. Just use whatever you have available.
 
AlexMonday, 16th June 2008 1:23am - No.2840
Plastic? And it appears in the pictures that the secondary is not even a coil at all. Am I right, or am I just seeing things?
 
AlexMonday, 16th June 2008 1:27am - No.2841
Also, how are the primary and secondary coils attached to the machine. I can't really tell from the pictures. And one more thing, can any of these parts be salvaged from appliances you might find around the house? If so, which parts, and what could you find them in?
 
RMCyberneticsMonday, 16th June 2008 1:32am - No.2842
Yes plastic. You are seeing things. It has to be a coil or it would not work. It is a coil of fine wire wrapped on a plastic tube. All attached together with epoxy resin. You are going to have to use your imagination to find the parts.
 
AlexMonday, 16th June 2008 1:38am - No.2843
Huh... It appears the primary coil is attached to some part of the circuit in the pictures, but it doesn't say anything about that in the diagrams. even with that, how is the primary coil attached to the machine, and do the primary and secondary coils touch?
 
AlexMonday, 16th June 2008 1:46am - No.2844
are the secondary wires coated with anything?
 
RMCyberneticsMonday, 16th June 2008 1:48am - No.2845
You must learn more about a Tesla coil and how a Tesla Coil works or you will not be able to make this project work.
Yes the secondary wire is enamel coated copper wire aka magnet wire.
You have a lot to learn before you should try a project like this or it will just not work. I can't possibly explain every detail.
 
AlexMonday, 16th June 2008 2:01am - No.2846
I understand. Thanks for your time. I really appreciate it.
 
AlexTuesday, 17th June 2008 11:17pm - No.2854
I have read up on tesla coils, and feel I really understand how they work now. My only remaining question is this: where else can I find a "Power Pulse Modulator" that will work for this project? The one sold here has been back-ordered 14 times, and I was wondering if you knew of anywhere else where they sell this item. The only ones I have been able to find don't match the specs of the one sold here.

Thanks, Alex
 
RMCyberneticsWednesday, 18th June 2008 1:43am - No.2855
They are only available here. We will have stock available again next week.
 
AlexWednesday, 18th June 2008 2:27am - No.2856
Ok, cool. Thanks again.
 
AlexFriday, 20th June 2008 2:07am - No.2861
I apologize for all the questions I have been asking, but my father has these questions about this project that I really don't think can be answered by anyone but the person who made this device.

First of all, why are RF chokes necessary, and what problems are caused with the device if RF chokes are not used?

Also, It says the spark coils generate about 20kv of energy. Why do you only need diodes and capacitors that can tolerate 15kv?

Lastly, with the primary coil having 5 turns and the secondary having 520 turns, with a direct relationship between the increase in number of coils to increase in voltage, wouldn't that mean that the 20kv put into them by the spark coils would increase 100-fold to about 2000kv?
 
RMCyberneticsFriday, 20th June 2008 12:18pm - No.2862
RF Chokes are simply coils of wire or inductors. They are used to allow DC to to pass through them for charging the capacitor whilst they block the high frequency from the primary coil+capacitor from getting back to the diodes.
If you dont use the chokes, when the spark gap fires, it can cause current or voltage spkes which would damage the diodes.

The coils are constantly loaded in this circuit and will never get as high as 20kV, infact the spark gap was set to fire at around 5kV but your components must always be rated significantly higher.

There is no direct relationship between the number of turns in this type of transformer. It depends on many factors.
 
AlexMonday, 14th July 2008 2:29am - No.2904
How are the cases of the ignition coils removed?
 
RMCyberneticsMonday, 14th July 2008 2:24pm - No.2907
Carefully with a stanley knife and a hacksaw.
 
Wayne OlmstedFriday, 18th July 2008 4:58pm - No.2918
Nothing is new under the sun... I used a model t ignition transfoemer (they were self exited with a vibrating interrupter) a spark gap and resonating capacitor made of plate glass and aluminum foil with a copper tube primary and a secondary wound on varnished paper carpet tube and that was in 1955... In 1960 I made a 7 ft tesla coil with a neon sign transformer and a pair of 811A's (large transmitting tubes) driving a copper tube primary with an 8foot secondary (also paper carpet tube) Blanked out radio reception for 10 miles around... didn't need transistors OR plastic
 
AlexMonday, 21st July 2008 2:07am - No.2922
Two things: where are the grounds on the spark coils and what are they grounded to?
 
RMCyberneticsWednesday, 23rd July 2008 10:28am - No.2930
The cround of your coils depends on the type. It is normally connected internally to the primary coil. If you cant open it to seperate it, you can just leave it out.

The ground is on your power supply or the negative terminal of your battery.
 

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