ฝัง
- เผยแพร่เมื่อ 18 มิ.ย. 2017
- Hello there!
Here you have some technical information:
Power Supply: Dual MOT, primaries in parallel secondaries in series. Around 4.2kV AC
Tank Capacitor: 144nF 6.3kV
Secondary coil wound with 0.3mm wire around a 11cm diameter pipe. Topload with the capacitiance of around 18.5pF, coupled with the secondary coil make up a tank circuit whose resonant frequency is around 140kHz. The sparks in the video are about 60-70cm long.
If you have any questions put them in the comment section - วิทยาศาสตร์และเทคโนโลยี
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Its great when you finally crack the circuit and get it right innit! Good luck for future builds, I for one would love to see more of this 😎💕🖖
That is beautiful! It hurts my heart to see the secondary being burned like that.
hey mate tesla coil is always a wow thing for me i built tesla coils a while ago which can wirelessly light up a incandescent bulb thats awsome.But guess what as a high voltage fan i want arc in my tesla coil lil big arcs . my previos coils were slayer exciter can u guide me how can i build a great tesla coil like yours pls.
Could you replace the capacitor with a 220nf one and a 30awg enameled copper wire??
twin mot? sounds like it can power a much bigger coil! the resonant frequency of this one looks nice tho.
Very nice, try landing a UD2.0 or higher, before UD3. That way you can throw 33uH inductor in it and screw it down. CM600's are not overkill at all, it just depends how far down you would like to drop the resonant frequency..... bigger coils, etc. Those bricks are inexpensive for slow switch times, but the higher ones are where the money will pour. There are SKM300GB125DN's that are made for 100kHz resonant inverters. These should suite your needs perfectly for a medium sized coil, but do get a pair of them. I hope the best on your next build!
Tesla Explorer would bucket caps or beer bottle caps also work or how do u calculate what capacitance u need
Can I have a link for the capacitor?
That's a great coil you got going, I'm doing a build very similar to yours, I wanted to ask if you had any difficulty getting your spark gap to fire optimally with a voltage of about 4.5kv, I've seen many people use voltage doublers and I myself am not doing that and sticking to something in the likes of yours. Also for some reason with my current inductance I need only 2 turns of my primary, that's not bad or anything I presume, is it?
Thanks a lot!
I'm not using any voltage doubler and the spark gap works fine, although it's a bit touchy when I'm trying to change its firing voltage, but it sure does work. The magnetic field may be a bit weak with just two turns tho, but I'm not sure, so I think you should just go ahead and see what works best for you.
Wish you luck with your build :D
How much AC in did you have? did you ballast a 120v 15AMP circuit or did you draw more?
@@Borna44 I powered it with 230V, and didn't ballast it.
I love MOT coils! I hope to build one soon!
How do you ground it indoors?
Usually u wire through windows and attach it to ground/soil or connected to grounded object like water pipe.
@@juntendo6104 Hm, even if it has a high resistance like steel or iron it will still work?
@@theplasmaprince8651 Not ideal but should still work in my opinion. In the world of high voltage, few ohms don't make much difference.
Yeah, I learned that you shouldn’t use mains earth for that. That is, if you value you life and household appliances.
Classic type spark gap I am making Tesla Coil. I have a
few questions to ask you. I would appreciate if you help. I use a 15
kV 30 mA Neon transformer for the input. I used a ceramic type
capacitor for the primary capacity. capacity 25 kV 30 nF. Capacitor
information 6 pieces 10nF 10 kV. 6 pieces 10 nF 15 kV. If I connect a
parallel 10 Megaohm resistor to each capacitor for fast discharge,
will the tesla work correctly? Will it be enough for insulation if I
cover the capacitor leg connections with silicone? Spark gap distance
13 mm is enough? I used 10 mm copper tube in the primary coil. I
wrapped 10 turns. How many mm should the connection cable between the
capacitors and the copper tube? I have 1 mm copper wire for the
secondary coil. How many times will the number of turns of the
secondary coil be? There is a 50mm diameter and 400 mm long plastic
pipe. How many turns should I spiral to resonate correctly? When the
process is finished, what is the spark length in the end when testing?
Which equipment do we need to cool when we make this circuit? Does
over-winding of the secondary coil cause overheating? Is it necessary
to cover the secondary winding with varnish?
If you answer this e-mail, I would appreciate it if you could help.
Alright, so your power supply is a nice pick. The caps, are they the disc style ceramics? In general id recommend something a bit more beefy. Yes the 10M resistors should be fine, as long as they have a power rating of more than 3W(might be wrong here, but you should try calculating the power that will be dissipating on them). Silicone tube or just silicone? It shouldnt be a big deal, but some insulation is recommended. Just be careful with these caps, despite the resistors they might hold some charge for a bit of time. The time constant of the formed RC circuit is 0.1s though so it should be fine. The spark gap distance is a variable that you will have to find over time, but 13mm should be a good start. 10mm is very thick for the primary, but it should work fine. The wire should be thick, but a standard 2mm^2 wire should do fine. The tube for your seconadry should be thicker, like 10cm diameter, but that thin one should work too. well, id say as many turns as you could fit on that pipe, but you might need a toroid to lower the resonant frequency. The spark lenght can be calculated by entering your psu power here; deepfriedneon.com/tesla_frame6.html this website is very useful. For the cooling nothing is really needed, but its recommended to blow some air across the spark gap. You could use a fan for that. Over winding the seconday shouldnt be a problem, but a varnish is recommended for sure. Its not a must though, up to you.
What kind of spark gap do you have??? very nice coil!
Do you have any kind of doubler on the mots?
What is your secondary and primary wire thickness?
Thanks, I have a static spark gap with a vacuum cleaner to help with the quenching. I don't use a doubler. 0.3mm magnet wire on the secondary, 4.25mm tubing on the primary.
Verynice 👍👍
Mr. Hertz first of all Great job sir ! This is a wonderful , and compact mot TC with all those beautiful streamers .... I'm actually building my first dual mot one now ...
Sir can u please give the schematic of your coil ? And what is the spark gap length ? Is it necessary to use a rotary spark gap ??? Plz reply asap sir ....! Thanks.
Thank u very much for the prompt reply sir ! God bless u !
Is the base of the secondary burning?
yep. i forgot to properly ground it, and it was arcing to the primary 😬
I have a quad mot set up but am having no luck getting the coil to work, how many turns do you have?
The amount of turns determines the resonant frequency of the primary LC circuit, which may be different from the resonant frequency of your coil, what is your primary capacitor and secondary specs?
But to answer your question, its 1400 turns on the secondary on a 11cm diameter pipe, and 11 on the primary, i dont remember where was the tuning point, i think around 4 turns or something like that. Primary cap was around 144nF i think, but sadly im also not sure, i havent worked on this coil for a long time now
How many coats on your secondary?
Jb Steyn I don't remeber exactly, but I think just one. I'd recommend using more(maybe 2-4, depending of the thickness of the layers) because I got some arc overs with just one layer
Aren't those Mmc capacitors expensive? How many did u use?
BHU1 LORD I used 3x 47nF 6.3kV russian military caps in parallel, I don't remember how much did they cost but I think it was a total of 20$
Mr. MHz thanks dude I am really inspired to build one of these
Are the MOTs unballasted and are you running it on 120v or 240v?
Theyre unballasted, powered directly from the mains. I recommend connecting them through some sort of a filter tho, it wont affect the performance, but it will remove all of the unwanted noise coming from the mots
Mr. MHz thanks
What did you use for your capacitor
Jb Steyn I used 3 russian capacitors rated for 47nF and 6.3kV each, all 3 connected in parallel
Make one to power your house. Run it off a nine volt battery. People always get a kick outa seeing that.
Hello There;
I made the tesla coil, the features of which are written below, but the spark coming out of the top load is 3 cm. What should I do to increase the output spark length?
Neon Transformer: Input 230 VAC.Output 15 KV 30 mA
Sparg Gap Spacing : 10 mm
Primary Capacitor Circuit: Ceramic Type 2.5 nF 40 kV (4 pieces of 10 nf 10 kV connected in series)
The resistor was not used.
Primary Coil (primary): 9.56 mm Copper Air Conditioning Pipe
Winding Shape : Spiral Coil
Space Between Windings: 10 mm
Number of Rounds : 11 Rows
Measured on a frequency of 1 KHz with a Primary Coil LCR Meter. Inductance (L) = 0.04 mH
Secondary Coil :
Copper Wire 0.40 mm.
Copper Wire Length 475 meters.
Coil Diameter : 110 mm.
Coil Length: 550 mm
Number of Rounds : 1375 rows
The Secondary Coil was measured with the LCR Meter on a frequency of 1 Khz. Inductance (L) = 33.4 mH
Toroid :
Aluminum Aspirator Ventilation Pipe
Channel Diameter: 130 mm
Toroid Total Diameter : 400 mm
Toroid Center Inner Diameter : 160 mm
Hey, this seems like a pretty solid build. I would point out the capacitance. try going for 100nF maybe. Remeber that the higher capacitance, the more energy the cap can store and discharge into the primary, thus giving you a stronger magnetic field and more output on the secondary!
@@mhz579 In the classical tesla coil I made, I used ceramic disc capacitors in the primary capacitor circuit. During the test phase, the ceramic capacitors could not handle the stress and burned out one by one. Now I will create a primary capacitor circuit again.2 I have a question. 1) Should I use a polarized capacitor (DC). Should I use a non-polar capacitor? This time I will use a Polypropylene capacitor. 2) Which of the MKP and CBB capacitors I use for this, will I make the right choice?
@@engincoskun6620 Ceramic type capacitors dont handle high power applications like a tesla coil well. Use a non polar capacitor, MKP would be great. Cornell Dubilier caps are a good pick. 942C20P15K-F to be specific is an often used type of cap, that can self heal.
@@mhz579 I do not have a dc rectifier circuit, can I use an ac type capacitor
@@engincoskun6620 yes of course. use a non polar capacitor. As i said, an MKP will be great
How mant volts were your capcitors rated for (vdc)
You can easily calculate how many volts they will recieve. For my setup i went with 6.3kV, which is a bit low considering that the peak AC voltage of my HV PSU is about 6kV, but so far only one of them blew up so i guess its fine lol(no but for real, i would recommend at least 8kV rated caps, in general its better to have a large safety marigin when dealing with tesla coils)
@@mhz579 why do you need double the voltage rating of what your inputing?
@@Borna44 Well, at first you need to calculate the peak AC voltage, which is the RMS value multiplied by sqrt(2) (so for egzample, 230V*sqrt(2)=325V peak, and in the case of my dual MOT high voltage supply 4200V*sqrt(2)=5940V peak), and then you usually add some safety marigin, since there may be a short sudden jump in your line voltage, or the voltage may increase due to resonant rise, which occurs in a Tesla Coil. In general its better to multiply your peak AC voltage by 1.5, and use that value. That way you can be sure that your capacitors will last for a long time.
@@mhz579 ah o see ok thank you
Why did you use caps of only 144nF, shouldn't you have been using more especially with a low voltage like that and high current comapred to other coils that use 12kv os such?
Its the resonant cap, the input voltage or curret doesnt really matter. I think you may have mistaken the resonant cap of the hv supply with the resonant cap of the primary LC circuit. The hv supply resonant caps capacitance is indeed dependant on the supply voltage and current
Hm, I'm a little bit confused. so you used caps on the power supply for resonant PFC to my understanding. But for my coil myself I used a calculator (deepfriendneon) to match my tank capacitance with the input voltage and current. For example with your setup I calculated 315nF for an optimal tank capacitance in your LC circuit. So if those were your LC caps what were your LC caps?
@@sblabs2800 Well, I just used the standard resonant frequency formula (1/2*pi*sqrt(inductance*capacitiance) if i remember correctly) and it does not really depend on the power supply output current/voltage so I dunno
Hmm well actually on the website you mentioned it says "maximum recommended tank capacitor size" so i guess mine doesnt exceed the value it suggests, so thats fine lol
Lol that's good. Yea cuz I got really confused but now I see what you did you matched your capacitance to get the frequency you need to resonate based on the frequency formula but I think you're supposed to match your capacitance first to the input power and then work with your inductance and treat your capacitance as a constant. the reason is your supposed to get your capacitors filled and discharge every half wave in the AC cycle. Yea I feel like if you had time to revist your coil you could definitely increase the output voltage since resonant transformers are outV=root(CPrimary/CSec) * inputV
What is your secondary's specs?
Jb Steyn It has 1400 turns of 0.3mm magnet wire around a 11cm diameter pvc pipe
MHz thanks and what did you use for coating your secondaty?
I actually don't remember, but according to tesla coil forums these are good for secondary coating: Polyurethane based varnish or clear epoxy, envirotek lite epoxy or Ranbar U2020
Make us tutorial
Shematic please🙏🙏
That's not low frequency
So
Looks like 140khz to me
Oh hey this is the 69th comment lol