Oh wow, great build! You Germans always are the best when it comes to high voltage stuff :D I love the fact that you use availible chinese HV components, and the corona and sparks look very beautiful!
I think You haven't seen russian videos yet😂 they are sketchy but they have most amazing HV content 😂 and also look sytopyro's YT channel... His experiments are out of mind 😂
the system I worked on provided milliamps, I don't remember exactly - maybe 5ma max. It was a very large expensive system. Full of sulfur hexafluoride. If you want one - I would estimate $100,000.00 or so would do it. good luck. @@TravisTellsTruths
Very nice, simple and easy to made build! The sparks were absolutely beatifull. I wanted to try this recently but didn't want to order a flyback from the web so I bought a old tube tv amd took the transformer from it. But I managed tp break the transformer and now I have to find a new tube tv. Rip 20€
Beatifull, great work!!!! I suggest that you insulate the flyback aswell. Maybe put it in a little jar of the same oil, probably it have some "leaking current" before the multiplier.
So the large series resistor in your ground path is to tame the spark a bit but also to reduce the current flow through the diodes on discharge? Since the diodes are rated at 20 mA? The one I built only has 8 stages but I used 20,000 V diodes rated for 100 mA. I don't put any resistance between the gap and have had no issues with the diodes. I actually built 2 circuits, the second one with the diodes in the other direction up the capacitor ladder, so I get a positive charge atop one and a negative charge atop the other. Common the ground point and spark between the top loads.
I have a very similar setup that arcs up to 10+ inches, but with 2CL2FM 20kV 100mA diodes. However when I use resistors on the output to limit the current, the arc distance decreases by more than half, so I'm stuck using only 11 ohms. Why do you think that is? Could it be that my resistors wattage is too low (I used ~10W)? Also, did you connect the transformer's black output (HV return) directly to earth ground? Thanks.
Hello! You use just a single 11 ohm resistor with 10W? This is far too less. I am using 10 resistors in series with total 120W. This is for protecting my diodes in the multiplier. Without the resistors I would get longer sparks too. But I want to avoid damaging my multiplier. You can often see setups without any resistor. This is very risky in my eyes. My resistors are located between the negative side of the spark gap and the bottom input point of the multiplier. This point is also connected to ground/earth...
@@stoppi No, the 11Ω resistor is 100W, but when I tried larger value resistors, I used 10W, and the sparks ended up very small :( I'll have to try it with a higher watt resistor but I'm just wondering if the reason the sparks were small is because the resistor wattage was too low, or if it was for another reason, like not enough current being transferred to the secondary / my turn ratio.
@@vusiliyK as I said, using resistors will always reduce the spark intensity and length because the spark itself has a low resistance. Therefore most of the voltage will fall off across the resistors and this limits the sparks... I use 11 kOhm resistors and 11 of them in series, so totally 121 kOhm... But you can go lower with your resistance when you want to increase the spark intensity. But this will also increase the possibility of a damage... It is also a question of how long your runs are.
Thank's. One diode with 20 kV could be not enough for 20 kV input voltage from the flyback transformer. Therefore I took 2 of them in series to be on the safe side
You have a 12 stage CW... is there a limit on how long it can be, as in, some practical issues when too many stages are present? I'm thinking of building (for reasons) a 22 stage CW which cranks up mains voltage of 120vac rms to 7.5kv dc
Hello! It seems tempting to increase the number of stages up to infinity. But you increase the internal resistance with each stage and then you will have additional problems like corona when you use too many stages and at too high voltage. My 12 stages are in the upper reagion of useful stage-numbers. With your low voltage you want to achieve I'd try it out. You want to use 120 VAC at the input. But at which frequency? Multipliers don't really work with low frequencies like 50 Hz. Therefore the input-voltage should have frequencies around 30-40 kHz. Otherwise you will have to increase the capacitance of your capacitors enormous... Good luck
The red 40 kV wire should be replaced with spark plug ignition wire with stranded copper conductor (*not* resistance wire). Then put it inside of 3/8" (9.1mm) I.D. vacuum tubing for more insulation. But I was thinking that instead of all the Cockcroft Walton multipliers, use a Marx generator.
I have very smillar one build year ago but it was very inefficient and unstable. I personally prefer series flyback supply or xray transformer. Voltage multipliers are too unstable for me do much components are making them easy to break if one capacitor fails it might not break the multiplier but will Heat up and burn eventually.
What happens if you remove the R resistpr to ground , the current limiting resistor. I understand that it limits the current, but what is the significance of reducing the current in your circuit ? Thanks
Hi! Good question. The resistor should limit the current to protect the diodes of the multiplier. If I don't use the resistor the sparks will get much more intense but the diodes will be more burdened...
@@jackspratt4343 unfortunately I haven't measured the current. But with the resistor the current-limit can be estimated with ohms law I = output voltage of the multiplier divided by the resistance...
At 0:30 you can see the schematics. The AC-flyback transformer is connected to the input of the multiplier. One input is also connected to ground and then with the resistors to limit the current of the discharge...
@@stoppi Brilliant. I see now. Thanks. If I have any sensitive electronic equipment nearby, should I move it before switching on the current. Thanks again.
If you need oil for insulation, do not use natural oils. Use vacuum pump oil instead, this is synthetic oil and the cheapest one is the oil used for milking machine vacuum pumps. Natural oils will oxidise and get rancid.
Hi! For example here: highvoltageshop.com/epages/b73088c0-9f9a-4230-9ffc-4fd5c619abc4.sf/de_DE/?ObjectPath=/Shops/b73088c0-9f9a-4230-9ffc-4fd5c619abc4/Products/TRANSHF_15KVAC
e.g. out of an old legacy cathode tube TV set. These things can handle up to maybe 30-35 kV. (which was used for acceleration of electrons across the evacuated cathode tube). The kV rating had something to do with the longestpossible distance between the emitter plate and the screen front. (how long the cathode tube actually was and how big the screen was as well in dimension)
Hello! For lower voltages there's the 10 kV per cm rule. With increasing voltages this value decreases. Therefore the estimate voltage for 26 cm sparks is around 200 kV.
Hello stoppi, its me again from Slovenia. I have a qestion... Do you maybe have a spare ac flyback transformer for sale? I cannot find it in my country :( it must be AC flyback
Hi Gregor! I would have one for you, but I'd like to have 18 Euro for it and shipping to slovenia would cost 12 Euro with hermes, which is the cheapest one. Therefore I think that you would get one on ebay for less money...
@@gregca1234 For 30 Euro including shipping to Slovenia I can offer you a new one like in the video. Otherwise you can ask at a local electronics store or television repair store...
@@alphaindustries5775 you can run it without the resistors but then the diodes may be killed. The sparks would be much brighter and powerful without resistors...
@@stoppi was ich nicht ganz verstehe: Wenn du einen 264 kOhm Widerstand hast, müsste sich, bei 200kV, doch eine Leistung von von 151 kW ergeben, oder? Da P = U^2/R.wie kommst du auf die 132 Watt?
@@gunrunner110 hallo! Die 132W ist die nominalleistung der Widerstände, nämlich 12 Stück in Serie zu je 11W. Deine Rechnung stimmt schon rein theoretisch, nur fällt in der Praxis wenn nur ganz kurz diese Leistung an den Widerständen ab. Da bricht ja sehr schnell die Spannung ein bzw. Liefert die Kaskade nicht genug Strom nach. Aber super, dass du alles so genau beobachtest und hinterfragst. Bin ähnlich gestrickt ;-)
@@peterplatzer4713 bitte ;-) gutes gelingen beim Versuch. Die verlinkten Dioden sind mit 100mA spezifiziert und eigentlich nicht teurer als jene üblichen mit 20mA...
Hello! As shown in the video I used 20kV/20mA high voltage diodes (2CL20kV) and 30kV/1nF high voltage capacitors. Good luck with your project and be careful 😉
@@stoppi how you calculated the values of components. Means if I need 60kv output and input is 8 kv then how do I calculate the value of the diode and capacitor. And how many diodes and capacitors are required?
@@chetansoni6299 you have to inform yourself about a multiplier. If it has n stages, the output voltage is 2*n times the peak of the input voltage. So if the peak of the input voltage is f.e. 8 kV and you have 5 stages, then the output voltage will be 80 kV. Each stage consists of 2 capacitors and two diodes. The capacitors should be chosen for 2-3 times the input voltage. Therefore I recommend 30 kV capacitors at 8 kV input voltage. Then you are safe...
Hi! I have sold one last week. Now there are "just" 3 pcs remaining and maybe I will need all of them. But look at highvoltageshop.at in the internet. They are selling AC transformers for around 27 euro...
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