/r/highvoltage
HV stuff
Discussing all things related to high voltage electronics and experimentation: induction coils, Tesla coils, electrostatics, influence machines, vacuum tubes, x-rays, plasma, spark gaps, lifters, Tesla, and related things
All things related to high voltage electronics and experimentation: induction coils, Tesla coils, electrostatics, influence machines, vacuum tubes, x-rays, plasma, spark gaps, lifters, Tesla, and related stuff
ANSI C84.1-2020 defines
high voltage as 115-230 kV
extra-high voltage as 345-765 kV
ultra-high voltage as 1,100+ kV
Other subreddits
/r/electronics
/r/askelectronics
/r/RFelectronics
/r/electrostatics
/r/Tesla
/r/highvoltage
4,356 Subscribers
Tesla coil in the dark
Got some nice footage of the coil funtioning in the dark, pretty happy with the performance now, I'll build a nice enclosure for the primary circuit asap
21:46 UTC
High power spark gap
Im trying to make a tesla coil. This is about 3A at 2.3kv.
20:55 UTC
6" Tesla coil 6kva microwave powered with beer bottles! 84" lightning
I don't believe i shared this here last year so here i am doing so now, it's been a few years now i should knock the dust off it and fire it up for a new video i may do that soon :)
10:57 UTC
First Tesla Coil test
Just fired my first ever tesla coil for the first time, and am getting very poor output. My guess is its really out of tune, and I need more turns, but I'm already using 10. I get pretty much no corona except a small dot if I'm lucky. Any suggestions on what to do next? I have a 0.045uF tank capacitor (30 942C10P15K-F caps, 10 in series wired in parallel) and two identical small MOTS in series. Secondary is around 4.5" PVC and around 950-1000ish turns. My spark gap is two knobs where ill usually use a leaf blower to extinguish, but I didn't in this video.
03:50 UTC
Made a better primary coil, gettong some longer sparks peaking around 16 inches
I will really focus on building a better spark gap right now becouse it might be te biggest loss at the moment, if it is to close it is consistent but spark length is decreased if it is to far away spark length increases but al seen in the video it occasionally stops, experimented with a rotary one but the bps was to low, I will try again in the future but for now the sparks are pretty good for about 600watt I think
22:56 UTC
Rasputin on a DRSSTC
My first post here! Though some of you might be interested in seeing this :).
Specs: • Halfbridge of FGH75T65SHD • 300V bus • ~280A of primary peak current, OCD at 240A • on-time limited to 70uS
03:51 UTC
Handheld Marx generator
Finished the handheld marx gen i was asking about earlier. Tanks for the advice everyone who commented on that
13:11 UTC
Flyback transformer diode
I recently got big flyback transformer from e-waste store I use zvs to drive it and realized that it only output DC but I want it to output ac but I already put it in oil and vaccum it so there way to fly or short internals diode without open it ?
09:27 UTC
Help with HV isolation
So i got one of those marx gen kits and a zvs off of ebay and i made it handheld. But im having an issue isolating the hv ground from the hot (doodled where it zaps). I know i can make the gap smaller but thats no fun. Also if anyones interested i can publish the project so qnyone can make their own. Also also, how dangerous is it to get zaped by this thing. I know it aint gonna be fun but is the thing lethal? Hopefully not. Thanks in advance
15:24 UTC
Variable output frequency for a slayer exciter/SSTC
I have built a SSTC but the output votltage frequency is too high for my intended application and one way is to change the dimensions of the secondary coil but I can't keep doing that for various frequencies Can I merge my circuit with a 555 timer singnal generator circuit(PMW, Sine wave etc) and expect to change the frequency by altering the resistors/capacitors for the 555 circuit? I have attached a pic of the circuit
06:42 UTC
What are some applications that a positive polarity hv supply can do that a negative one can’t
10:50 UTC
Made a propper topload, 10inch sparks but I think my capacitors are limiting my output
I am using a capacitor bank what equates to 9.4 nf and a 11uh inductor for 500khz, but I have a feelijf 9.4 is to low of a capacitance, if sonore knows more than I do please let me know
22:01 UTC
Component sources
It's been years since my old NST burned up and I want to get back into the hobby. I'm looking to build a 50-70kV(not variable, just in that ballpark), ~1mA HV power supply. I'm looking to modify a standard, el cheapo ZVS driver with PWM control, or just build a 555 circuit with a MOSFET. Not sure yet. But, in any case, I need components.
I'm looking to find a source for a flyback or other compact HV transformer but without the internal cap/diode/snubber. Is there a source for such a thing or do I need to wind my own? I'm hoping to build a full-wave multiplier to improve ripple on the output so I need a proper AC signal of, say, 5kV. MOTs are cool but a little larger than what I want(physically and power-wise) so I was hoping to go with a flyback form factor.
What about HV caps & diodes for the multiplier? Are you guys ordering off AliExpress or going to a standard electronics supplier? Same question for HV cables. Can I get, say, 50-70kV cable by the foot somewhere?
I'm hoping to add a milliammeter as well. Do you have a recommendation for a HV friendly one? If I panel mount it, the last thing I want is arcing to the panel/ground.
18:43 UTC
Transformer core
Is there any other metod to separate the core of a transformer without heating it or dipping it into boiling water?
19:37 UTC
Why is there a ribbed material covering the centre coil of a plasma globe?
As per the title. It's something I've always been curious about. Is it merely an insulator, or is it the way the coil is constructed?
22:06 UTC
I want to build a better spark gap for a sgtc, I'm wondering what is better? A multisegmented gap or a rotary one, and why?
This Is my first time building a propper coil so I am not that sure, I can not really find any good comparrison online
20:43 UTC
I'm addicted to increasing my arc size. Anyone else who builds somthing and instead of being happy with the output Just keeps thinking on how to increase it?
20:31 UTC
Improved spark gap test, Just wanted to see what i'd get out of the zvs driver. Planning to building a rotary spark gap, any advice?
Getting some pretty nice sparks but a lot of losses to the bad topload, 3d printing one very soon!
22:22 UTC
Very rough setup with my zvs driver, some nice sparks from the sgtc! (Short test becouse my spark gap was burning lol)
06:35 UTC
Im trying to build a nitric acid reactor and I need help!
I'm trying to build a birland eyde reactor in wich an arc is needed to turn air to nitrogen dioxide. I need a transformer for this and I have found one that seems suitable for my needs it only takes 120v (its a carlin ignitor 4100 model) Input: 120V, 60Hz, 40VA Output: 19KV Peak, 35mA I need something similar to this that can take 220v, but most are too expensive and im not too familiar with this electrical stuff yet I really want to make a reactor of this type. I don't know what to look for so any help would be greatly appreciated.
06:08 UTC
My SRSG Tesla Coil
I finally got my synchronous rotary spark gap Tesla coil working fairly well, though I really need to add a strike ring. So far the strikes to the primary don't seem to have hurt anything, so it seems like the Terry filter is doing it's job. I could probably get some more streamer length out of it but the coupling is fairly low due to me raising the secondary to avoid primary to secondary arcing. I could do with cutting out the inner most ring and lowering the secondary but I also had problems with racing sparks up the secondary so I'm not keen on rasing the coupling much right now.
Stats:
2x 15kV 30mA Franceformer NSTs. They're newer transformers but I haven't had any issues with the built in GFCI
27.15nF MMC with 88 Cornell Dubilier 942C20P15K-F capacitors. 4 parallel strings of 22.
Shinano Tokki x7807-202v synchronous motor, 120 BPS
~7.5 turns on the primary, 0.25" copper tubing spaced 0.25" apart, 6.5" inner diameter.
4.5" x 18" secondary, 26 awg wire, ~990 turns
18.5" top load from Eastern Voltage Research
203kHz measured resonant frequency
Let me know if you all see anything I could improve.
21:00 UTC
400 kV through Laser Scribed Graphene on Kapton
If nothing else, it significantly reduces the sound from the spark gap. Looks pretty cool too.
17:39 UTC
Why would you use ground instead of neutral for HV transformer primary connection?
This is a schematic of of a HV Ignition transformer with the primary connection using the ground without the neutral connection. The relay K1 remove power.
13:49 UTC
For a Tesla coil, could I use this about 500watt zvs setup or should I Just invest in a NST?
21:15 UTC
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