At these frequencies (>10 Mhz) top of the dischage isn't "electrical" anymore. It's more like a flame. If you put grounded electrode in the top of the plasma, the gap won't break down! I would like to see it run when oriented upsidedown. I expect the torch flame be significantly shorter
I can't remember who I saw do it.. maybe Vidduley? But he inverted the flame to show what would happen and it basically went straight down. Not sure how that would work with these. I'll see if I can rig something up to try that.
Hard to say but I don't think it would die at that power. Maybe after like an hour or something on a hot day IDK.. but they hold up well for their size. You can get 15kV ones that are decently bigger for around 50 bucks. Probably what I'd do for higher power. It's either that or stacking three of the 33pF caps which are around the same price or more for 3, but then need to add some type of planes to couple them.
@ interesting. I made a similar circuit for the plasma toroid thing. My caps will get pretty hot if it’s not generating a toroid but if the toroid forms then the caps stay pretty cool. I didn’t use a doorknob tho so maybe that’s why
I'm sure there are some RF fets out there that could do it but for the price IDK. I'd think some similar fet would be like $60 but these SiCs don't leave much to be desired. The losses are insanely low when driven class E so it just seems like a waste to use more expensive fets. At 3kW Steve only needed a small bit of airflow to keep his heatsink cool.
I was a little worried about that with the one that killed the fet first try cause even though I wound the secondary to spec, if I had to guess it's closer to 10mhz than it is to 20mhz. So that's why I basically tried winding the primary a little lower just in case. I did also try a secondary with less turns on a similar circuit but I couldn't get it to break out at 30V. This circuit needed some reasonable coupling to get the breakouts to free air. I got some more magnet wire coming today so I'm probably just going to wind a ton of coils. Not sure the best approach to take to try avoiding killing the 150mohm sic I still have yet to try cause I def thought the first fet that died was on a circuit pretty close to spec.
@@Magneticitist I would assume having a secondary the same frequency as the primary would be optimal, but when i switched to one double the primary frequency it stopped acting real weird and the current draw dropped significantly. The flame was a little smaller but it let me crank the input voltage significantly higher
@@darascope It can be done that way especially at lower voltages and powers but Steve's is designed to avoid the secondary resonance so he intentionally only has a moderate voltage boost from it. That's the operation I'm going for as well. It's not a whole lot of wire length difference between around 20mhz and 10mhz with those dimensions though.
@@Magneticitist I just finished up cutting some mica sheets for a new secondary, I'm only using a 1 inch diameter instead of 1.125 inches, javatc says in need ~ 50 turns so tomorrow after the glue dries I can wind a secondary that wont self destruct lol
@@darascope Has Javatc seemed to give you good calculations for these frequencies? I was noticing when plugging in the secondary values of roughly 1.125 inch diameter coil and roughly the same height w/48 windings, it was telling me something closer to 11Mhz if I recall. I figured out my first fet died cause I must have jacked up my resonant caps and didn't notice. I didn't notice til I killed the other fet the same way lol.. luckily I still have a couple of the other 750V fets that are a little nicer so one of those worked no problem and I get better waveforms at a little over 11Mhz. This overheating of the secondary is now a concern I see I need to deal with. Right now I just have the coil wound around a former then carefully removed and wrapped with kapton tape. No core to melt but I figure if it starts melting the tape then it's already melting the wire enamel.
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Awesome stuff!
The most important video on RUclips right now
IDK I'm like 3 years late tho haha
At these frequencies (>10 Mhz) top of the dischage isn't "electrical" anymore. It's more like a flame. If you put grounded electrode in the top of the plasma, the gap won't break down! I would like to see it run when oriented upsidedown. I expect the torch flame be significantly shorter
I can't remember who I saw do it.. maybe Vidduley? But he inverted the flame to show what would happen and it basically went straight down. Not sure how that would work with these. I'll see if I can rig something up to try that.
@Magneticitist I went to his channel. He experimented with HV DC. HV HF makes like in your case makes torch flame discharge quite a different animal
@@imeprezime1285 Oh I remember now it wasn't Vidduley, he has a good video on the history of the circuits, but Vdekje turned his upside down.
Dude that’s crazy. I’m surprised that capacitor didn’t explode. Awesome build. Love seeing your circuits and videos
Hard to say but I don't think it would die at that power. Maybe after like an hour or something on a hot day IDK.. but they hold up well for their size. You can get 15kV ones that are decently bigger for around 50 bucks. Probably what I'd do for higher power. It's either that or stacking three of the 33pF caps which are around the same price or more for 3, but then need to add some type of planes to couple them.
@ interesting. I made a similar circuit for the plasma toroid thing. My caps will get pretty hot if it’s not generating a toroid but if the toroid forms then the caps stay pretty cool. I didn’t use a doorknob tho so maybe that’s why
Very nice! RF rated Fets would work even better. I love how the look like fire, it’s absolutely stunning.
I'm sure there are some RF fets out there that could do it but for the price IDK. I'd think some similar fet would be like $60 but these SiCs don't leave much to be desired. The losses are insanely low when driven class E so it just seems like a waste to use more expensive fets. At 3kW Steve only needed a small bit of airflow to keep his heatsink cool.
is that secondary running at the same or double the primary frequency?
I was a little worried about that with the one that killed the fet first try cause even though I wound the secondary to spec, if I had to guess it's closer to 10mhz than it is to 20mhz. So that's why I basically tried winding the primary a little lower just in case. I did also try a secondary with less turns on a similar circuit but I couldn't get it to break out at 30V. This circuit needed some reasonable coupling to get the breakouts to free air. I got some more magnet wire coming today so I'm probably just going to wind a ton of coils. Not sure the best approach to take to try avoiding killing the 150mohm sic I still have yet to try cause I def thought the first fet that died was on a circuit pretty close to spec.
@@Magneticitist I would assume having a secondary the same frequency as the primary would be optimal, but when i switched to one double the primary frequency it stopped acting real weird and the current draw dropped significantly. The flame was a little smaller but it let me crank the input voltage significantly higher
@@darascope It can be done that way especially at lower voltages and powers but Steve's is designed to avoid the secondary resonance so he intentionally only has a moderate voltage boost from it. That's the operation I'm going for as well. It's not a whole lot of wire length difference between around 20mhz and 10mhz with those dimensions though.
@@Magneticitist I just finished up cutting some mica sheets for a new secondary, I'm only using a 1 inch diameter instead of 1.125 inches, javatc says in need ~ 50 turns so tomorrow after the glue dries I can wind a secondary that wont self destruct lol
@@darascope Has Javatc seemed to give you good calculations for these frequencies? I was noticing when plugging in the secondary values of roughly 1.125 inch diameter coil and roughly the same height w/48 windings, it was telling me something closer to 11Mhz if I recall.
I figured out my first fet died cause I must have jacked up my resonant caps and didn't notice. I didn't notice til I killed the other fet the same way lol.. luckily I still have a couple of the other 750V fets that are a little nicer so one of those worked no problem and I get better waveforms at a little over 11Mhz.
This overheating of the secondary is now a concern I see I need to deal with. Right now I just have the coil wound around a former then carefully removed and wrapped with kapton tape. No core to melt but I figure if it starts melting the tape then it's already melting the wire enamel.