It can basically become silent at something like ~2.5Mhz or maybe even lower. I have a few in the ~3Mhz range which run silent. The outputs which are clean but have running frequencies much higher than the audible like the hundreds of khz just basically do that hissing due to how the arcs are propagating. It's like taking such a noisy output and then drawing a solid arc from it to a screwdriver or something. If the duty cycle of the current is high enough you just get more of a smooth flame-like arc that's also quiet.
Now that i have some money I might re visit the SIC world. Are you using the class E amplifier tuning image thats been floating around? I've been through steve ward's essay but there's not much about properly tuning components based on waveforms.
@@BoredHighVoltage It's a little hard to really provide steps to take because there's a huge "it all depends" variable going on...but there are some things which typically remain consistent enough. For example this build might change entirely regarding what I need to tweak if I change the coupling too much. Best thing is to just try to get a ballpark decent oscillation, scope it, then just observe what your changes are doing. If you need to decrease or increase gate voltage for example you know you can play with Cgs and maybe the coupling. When I saw my drain swing was not falling back to 0 before the gate turned back on I could play with Cds as well as the coupling some to tune that.
I believe his talking about that famous paper on Class E oscillator or amplifier in which there are like 9 pictures telling you what kind of modification you need to do to the circuit with different DS waveforms.@@Magneticitist
@@Magneticitist its a class E tuning guide floating around on discord but I can't find the original source. Explains what each part does and how changing each parts value changes the waveform.
on your setup what does changing the coupling do for you? i feel like adjusting the coupling on mine does nothing, i still need to look at mine on an oscilloscope tho
@@darascope for this one reducing it slightly increases power, very slightly increases gate voltage, and seems like it also very slightly shifts the phase delay. So for example I raised it another half inch or so and gained about another 100W.
@@darascope yea flame was bigger but reducing coupling helped me tune it better only based on the other variables. By reducing coupling and reducing Cds, I can now get a decent waveform so long as I go above about 55V. Things change a little as the plasma grows. I can't say what I have is optimal tuning or anything, it's just an example of how I could tweak values to get OK switching without having to rewind coils.
@@Magneticitist at one point I increased coupling till i had an arc over between the coils😭, I have no clue how the fet didnt explode, but now im just confused as to why steve tuned his final design for a higher coupling ratio
![Electronic Circuitry Diagnosis And Fault Finding! [Repair]](http://i.ytimg.com/vi/LC7OjuYAOQE/mqdefault.jpg)
That silent flame discharge is unlike any coil I've seen before, guessing it has to do with running in the 10s of MHz rather than 10s or 100s of kHz?
It can basically become silent at something like ~2.5Mhz or maybe even lower. I have a few in the ~3Mhz range which run silent. The outputs which are clean but have running frequencies much higher than the audible like the hundreds of khz just basically do that hissing due to how the arcs are propagating. It's like taking such a noisy output and then drawing a solid arc from it to a screwdriver or something. If the duty cycle of the current is high enough you just get more of a smooth flame-like arc that's also quiet.
Now that i have some money I might re visit the SIC world. Are you using the class E amplifier tuning image thats been floating around? I've been through steve ward's essay but there's not much about properly tuning components based on waveforms.
@@BoredHighVoltage It's a little hard to really provide steps to take because there's a huge "it all depends" variable going on...but there are some things which typically remain consistent enough. For example this build might change entirely regarding what I need to tweak if I change the coupling too much. Best thing is to just try to get a ballpark decent oscillation, scope it, then just observe what your changes are doing. If you need to decrease or increase gate voltage for example you know you can play with Cgs and maybe the coupling.
When I saw my drain swing was not falling back to 0 before the gate turned back on I could play with Cds as well as the coupling some to tune that.
Also not sure what tuning image you're talking about
I believe his talking about that famous paper on Class E oscillator or amplifier in which there are like 9 pictures telling you what kind of modification you need to do to the circuit with different DS waveforms.@@Magneticitist
@@uecmitsuimarinedieselengin873 oh that sounds helpful lol. I don't think ive seen it.
@@Magneticitist its a class E tuning guide floating around on discord but I can't find the original source. Explains what each part does and how changing each parts value changes the waveform.
Looks like sic could achieve a higher efficiency than si mos 🤔
It 100% does!
on your setup what does changing the coupling do for you? i feel like adjusting the coupling on mine does nothing, i still need to look at mine on an oscilloscope tho
@@darascope for this one reducing it slightly increases power, very slightly increases gate voltage, and seems like it also very slightly shifts the phase delay. So for example I raised it another half inch or so and gained about another 100W.
@@Magneticitist so decreasing the coupling helped get it closer to class e? and with that extra 100w did you see a difference in flame size?
@@darascope yea flame was bigger but reducing coupling helped me tune it better only based on the other variables. By reducing coupling and reducing Cds, I can now get a decent waveform so long as I go above about 55V. Things change a little as the plasma grows. I can't say what I have is optimal tuning or anything, it's just an example of how I could tweak values to get OK switching without having to rewind coils.
@@Magneticitist at one point I increased coupling till i had an arc over between the coils😭, I have no clue how the fet didnt explode, but now im just confused as to why steve tuned his final design for a higher coupling ratio
@darascope I mean honestly bro it's pretty amazing you got so far without scoping anything