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Mini Spark Gap Tesla Coil

Mini Spark Gap Tesla Coil
Right after I got done making the Plasma speaker I wanted to work on something else that had to do with a high voltage flyback transformer. I searched on the internet, looked at videos on you tube on how to make them. I am going to show you how I made a decent SSTC that makes about 4 inch arcs. This is a good way to have both a working plasma speaker and a mini tesla coil just by adding a few extra parts!
 
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Step 1Items you will need

Items you will need
Flyback driver:

TL494 chip
200uF (or 220uF) electrolytic capacitor
47nF 250v capacitor
100nF capacitor
10nF capacitor
2.2K resistor
10 ohm resistor
UF4007 diode
10K potentiometer
22K potentiometer
IRF540 MOSFET
Large heatsink
Flyback transformer (you can get one from an old CRT.)
12v power source for TL494 oscillator
12v to 40v power source for the flyback transformer
*All the parts (Excluding the fly back, heatsink, and the power supplys, ) I got off of mouser for 12 bucks.*

Tank capacitor & Spark Gap:

8 -- 3000V .047uf CDE HV Meallized Polypropylene Film Capacitors
8 -- 10 Mohms 5% Carbon Film resistors
2 -- Screws for spark gap
*Pricy, caps was 2.22 each on mouser*

Primary Coil:

10 ft soft copper tubing ý OD ( 7 bucks at lowes or you can get 12awg solid wire, it will also work!)

Secondary coil:

PVC 1.5 d x 4 w pipe (2 bucks at lowes)
27AWG enamel-covered solid-conductor copper wire ( Got from radioshack comes in a pack of 22, 27, and 30. Get three of them! Or if you can find them cheaper somewhere else get em! They are 6.59 each

Toroid:

1 Ft 2.5 in drain pipe (lowes 2.15 a foot)
Aluminum plated tape (7 bucks at lowes)
Wood or cardboard
Nylon bolt and nut
washer
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55 comments
1-40 of 55next »
May 21, 2011. 9:29 AMhighvoltageguy says:
could u use an ignition coil?
Feb 17, 2011. 6:54 PMJimmy Proton says:
Just a comment on the name, all Tesla Coils are spark gap (except solid state), it suppose to be the kind of gap.
Mar 16, 2011. 8:57 PMspark light says:
not all tesla coils are spark gap/solid state! You kids have no idea what vacuum tubes are these days, do you? :D
May 15, 2011. 12:21 PMpdub77 says:
HA! Hey, at least they're trying, right? How many kids out there are making Tesla coils? How many kids know who Tesla even is?
May 16, 2011. 3:16 AMspark light says:
Saddeningly few.... Saddeningly few.....
Which is why we must spread the word!
Dec 30, 2010. 5:29 AMjustjimAZ says:
I was just wondering if metallic spray paint would be conductive enough for this purpose? A can wouldn't cost much more than a roll of aluminum tape. It would be easier to keep it smooth.
Oct 3, 2010. 4:57 PMtzq33tdq says:
this is so cool i want to make one. how many volts is it and why is it so awesome?

May 17, 2010. 1:01 AMdeawon2 says:
Hi i've seen some pic's and vid's of tesla coils and i found out that you can make a ring of lightning instead of just sparks i thought this was achieved by putting an engine and a guiding 'lance' sort of speak (to guide your current) on top of your 'topload'. Can you please give me a little more info or even an instructable if possible.
Thank you.

grtz Deawon2
Aug 29, 2010. 9:26 PMquantumkittty says:
the ring of lightning was actually just a lance-to-ground setup, and the effect was caused by a long exposure with the camera when taking the pic :D
Aug 12, 2010. 2:43 PMSkyriam says:
How can you get sparks to your hand and not get hurt?
Aug 10, 2010. 2:59 PMJimmy Proton says:
can you use microwave caps
Sep 8, 2009. 7:08 AMpyrorower says:
You know those zappers people make from disposable cameras? I'm wondering if you remove the capacitor and attached wires to the points on the circuit board that charged the capacitor if you could then use the camera as a sort of high voltage generator to power a small tesla coil. Anybody know?
Jan 9, 2010. 2:27 PMBeanahVulgaris says:
First of all, be carefull. Second, using more than 1 flash charger with it's 300 volt outputs in paralell will create a generator that can supply more watts per second that just one, (scale it up to charge something that needs more amps).

How to make this usefull... Charge a capacitor bank and periodically discharge it through a transformer. Dependant on how many watthours the stacked up chargers can give, you could run a tesla coil off of a huge bank of 1.5v sources (the chargers can use 2v but why push the horses to death when you can just link up more horses to take the load?)..... maybe even the Baghdad batteries could be used! Or maybe even John Hutchinson's ammoshell casimir effect batteries.

suggestion for the periodically discharging switch: In the spirit of ancient technologies, i suggest a rotating spark gap where a metallic star, attached to a laquered shaft of wood, is rotated by a separate source (a dc motor or something) and thus if it is a 6 point star you would have 6 discharges per rotation as the points brush up against contact flaps or something.

Completely possible to have done with just transformers and baghdad batteries to transmit radio or use for highvoltage lightning.... but thats getting off topic.
Jan 17, 2010. 9:57 AMXellers says:
Just for fun, I once used a modified camera flash supply (minus the rectifier diode) and a voltage multiplier to power a small Tesla Coil. It wasn't too impressive, but it was very fun to draw 2" long sparks that were coming from a single 1.5 AA battery.
Jan 18, 2010. 1:22 AMBeanahVulgaris says:
wow!  did you have to periodically charge the cap bank for a good while?
Jan 18, 2010. 9:28 AMXellers says:
Actually, it was even more impressive because the capacitors fired about twice per second! Of course, the battery didn't last very long.... ;)
Jan 18, 2010. 6:08 PMBeanahVulgaris says:
I'd love to try to hook up a large battery bank of potatoes or even "baghdad battery" bank. I've been trying to mess with circuits that pick up a static charge from the air. This is an idea dating back to Nikola Tesla's patent "Utilization of Radiant Energy"

The idea is using a teslacoil system in reverse (the HV terminals pick up HV static in the air and periodically discharge into a resonant transformer that stores the energy in a battery or something).
Jan 18, 2010. 6:54 PMXellers says:
Ummmm.... not to upset you, but that wasn't quite what Tesla's idea was.... What I've been able to achieve is transmission of energy from one resonant oscillator to another (at the same frequency) - that isn't quite the same thing as "[picking] up HV static in the air."
Jan 19, 2010. 12:11 AMBeanahVulgaris says:
The patent you want to look up is US# 685 957

Tesla understood the research of Kristian Birkeland in his experiments with his terella laboratory. He discovered the actions behind the aurora borialis and australus. Tesla knew that charge particles were bombarding the earth every day . He realized that if the energy from the sun was only lets say positively charged particles, then the sun would charge negative and the energy would diffuse through space as 1/R^2. If the negative and positive flowed together the net charge loss would be neutral and thus the energy component would be kinetic. I dont know if he knew the magnetosphere split the charges into positive and negative but im sure he realized something like this was going on.
Basically if the atmosphere consists of this charged strata, is there a way to harness it. Basically like harnessing the power of a lightning bolt, but instead of harvesting the strike, you harvest the dipole the earth naturally has before the dielectric breakdown occurs (the lightning).
Sep 26, 2009. 10:15 AMThe 4th Doctor says:
no the spark gap would have to be very very small and precise for 300 volts and disposable camera circuits supply a very low amount of power :/
Jan 17, 2010. 3:34 PMBeanahVulgaris says:
well i was thinking more along the lines of the rotating metallic star hitting contacts or something. Sparkgap operating at 300V isnt enough i agree... unless its a very small delicately placed gap.

As for the low power, this is true. But to increase the power output you can link the 300Volt outputs in paralell. The acctual charging circuitry on the board takes up something like a 10th of the space so size is not toooo much of an issue. (look up coilguns on this site and theres an instructable on removing the small charging circuit on the flash camera circuitboard).

Technically you should be able to connect X amounts of these things in paralell to get Y increase in current at 300V. I've been trying to look into the use of these power charge circuits as a power supply for a post apocalypse scenario (i liked playing fallout so i see it kinda as a hobby idea... i promise im not crazy or stockpiling things in a giant fallout shelter.)
Jan 17, 2010. 6:28 PMThe 4th Doctor says:
i think quite a few would be needed i doubt these things could crank 10 watts without blowing smoke, cant imagine it being practical. power supply for post apocalyptic scenario you say, an inverter? same problem again

but i guess pretty large masses of em can be had fairly easily usually
Jan 18, 2010. 1:21 AMBeanahVulgaris says:
Inverter? nah, i've been thinking about ways around semiconductors for highpower systems.

And yes, it would probably take quite a few to get a good steady 10w/h out of it, but thats the beauty of the simple circuit... as many as you like could be added.
Its the 1.5V source im worried about lol...  a huge HUGE bank of baghdad batteries or maybe John Hutchinson's casimir effect battery.
May 17, 2010. 1:12 AMdeawon2 says:
If you wanna make a post apocalyptic scenario maybe you could try a 'lightning machine'
used for charging clouds with static energy at a certain place and then making them bump in eachother (basicly how lightning works,but I guess you already knew) and then finding an effective delivery system for global coverage
Dec 2, 2009. 2:39 PMjosh1324 says:
Does it hurt to touch the sparks?
Jan 17, 2010. 3:56 PMBeanahVulgaris says:
yes.

Its kinda like bodies of water.

If im in a pressure chamber and the pressure of the water rises, i can take it.
Thats like voltage.

But voltage with a path to flow is like being in that pressure chamber and then some one busts open the side of it with axe or sledge hammer or something...... All of a sudden the water would rush through a path to the low pressure open hole. Being in this path i would get hit with a current of water and possibly shot out through the hole. weee!

So when you touch one terminal its like being in that chamber. When you touch a terminal of a different pressure/voltage you create a path through yourself for the current to flow. You are in the path where high pressure meets low pressure.

I forget the acctual values of current that can kill a person. But even rediculously low amperages placed across the heart (from fingertip to fingertip) can kill a person or create toxins that are very very hard on the body. Just as a small example, if we are mostly water and putting positive and negative leads into water creates hydrogen and oxygen gas, imagine what thoes chems can do to a person.

Tesla's high frequency high voltage systems dont hurt as much because of 2 things. 1, the higher the frequency the less your nerves can respond to the flucutating electric fields.
2, there is such a low current that the wattage thats travelling through you is low (Watts= voltage*current)
3, there is the supposed 'skineffect' where the flowing charge for high frequency currents seems to exist mainly on the surface of a conducting body.  True for conductors but i wonder for organisms...

anyways, if i got anything wrong, other peeps pls pls correct. Thx.

(sorry about the longwindedness but hopefully that answers the 1 question that was asked and maybe afew more that arose.)




Jul 18, 2009. 6:53 PMvolthead says:
If you want if to sing try replacing the spark gap with some xenon flash tubes from camera flash circuits. Hope it works
Sep 2, 2009. 8:31 AMXellers says:
How would that work? Modulation is only possible on solid state and vacuum tube Tesla Coils.
Sep 2, 2009. 9:06 PMvolthead says:
You would need to have a bps of 20000 and vary the current with IGBTs. Also I have learned a lot more since I posted that comment. And some (like me) have a low budget so MOTs are the only option. MOTs can be ballasted resistively with a 150W light.
Sep 3, 2009. 6:50 AMXellers says:
Changing the BPS rate does change the frequency that you hear coming from the sparks, but the reason that it is not done with SGTCs is that as you increase the BPS, the energy stored in the tank capacitor in each cycle is lower and lower, and the capacitor is usually matched to the frequency of the transformer and its voltage and current, so on some cycles, the transformer will charge the capacitor and then reverse polarity, and discharge it. It might work, but at each frequency, the sparks would take a different appearance, even though the total energy in the circuit would remain the same. Also, IGBTs are not practical with a SGTC due to the VERY high voltages and currents involved. You might be able to try this with an OLTC, but I wouldn't expect good results. Also, MOTs are usually better ballasted using an inductive ballast, such as another MOT with shorted secondary windings.
Sep 2, 2009. 3:42 PMXellers says:
Don't use microwave oven transformers, yet. You should only do this when you are very confident in your constructions skills (verify this by building a few smaller neon sign transformer or OBIT powered Tesla Coils first), when you fully understand the physics of the circuit (be comfortable with LC circuits and using calculators, understand quenching and damping effects within the circuit, and be able to understand the current flow within the circuit), and when you have a large, clean area to work in. Even a ballasted microwave oven transformer is lethal. Also, you should collect more transformers, at least 3 for a ballasted antiparallel setup that should provide 4kV. You may also consider using a voltage multiplier, to make the voltages easier to work with. A Tesla Coil built using microwave oven transformers is a big commitment, and will take a lots of time and effort. I recommend that you set those transformers aside for the time being.
Sep 2, 2009. 9:14 PMvolthead says:
You are doing better than me. I keep meaning to make an instructable but I have not made anything cool yet. Good luck.
Sep 9, 2009. 5:34 AMpyrorower says:
Before I build this and attempt to also modify it to "sing", there is one thing I am unsure of... After modifying the coil to sing, would the current be higher than in the unmodified version?
Sep 9, 2009. 1:32 PMXellers says:
First of all, you won't be able to modulate any sort of spark gap Tesla Coil, so don't expect to. Also, modulation does increase the current in the coil. It only varies it, to expand or contract the plasma generated by the coil to oscillate air. We perceive these oscillations as sound.
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Author:Somersetcommunitycollege
I have 2 associates degrees in electrical tech also getting another degree.