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Currently i am working on this TC, this is so far my most powerful TC. But needs a few tweaks.
Driver:
And H-Bridge
I am powering it up with 50V inverter (i am too chicken to hook it up to real transformer). Inverter works with around 40khz, interrupter around 4kHz, so it makes pretty good job.
Primary is tapped between 6/12 turns and secondary has around 1100turns. Fres is somwhere between 300-400kHz, i dont have any accesory to measure it precisely. It runs better with 12turns, sparks are like one fat plasma instead of tiny ones. On 6 turns it has problems with self resonance (works, but not nicely) - this has to do sometthing with my inverter, because otherwise it worked better with 6.
As for GDT, i am using toroidal core from PC SMPS, which i believe is iron powder and therefore lossy, so this might be the biggest performance sucker. It has around 6 turns of twisted LAN cable (4+4 wires)
Everything is running up cold except for Bipolars driving GDT, they are now with small heatsinks and ventilated with small fan, which keeps them quite warm.
Free sparks to air is around 5mm long, and hard-to-see.
It makes squeeky sound, ears are in pain when i am running it for more than few minutes, but sparks are only 2cm long!
To do: Change IRF530 for IRFP460 (my best performer so far, but i am scared of gate capacitange of 4 of them), maybe IGBT (somebody with 3 IRG4PC50WPBF ? ) I left out zeners, it runs good without them (some capacitance less) Change SB560 for some better diodes, for higher voltage. Or common fast diodes, like my fav. BY329. Take out some capacity from H bridge, it takes hours to self decharge!
Any ideas for improvements? I might try DR(I)SSTC, but i have no idea of resonant frequency, so ... I was also thinking of audio modulation, just need to find some pulse width schematic and use free NAND gates.
Edit: Today i messed up with this, and got around 6cm spark length (thats about 2 and half inch). Didnt do much with circuit, still waiting for proper components. I just swapped my 4*4700uF / 63V for 4*330uF / 400V, as it seemed to be biggest voltage limiter. Now the schottky SB560 diodes dont let me go higher than 57V, so i need to change them. I also tried DRSSTC with just randomly putting 1-10nF, but didnt seem to help any. It required more turns to run properly. Sparks were hotter and orange.
Spontanious breakout around 1cm, not needle like, but spreaded.
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ISSTC H-bridge
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