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Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
ok here are more pics(Again)
whole circuit redone on aluminum open-back.. also aids in grounding the whole oscillator circuit..BUT is TOO THIN for a proper heatsinking of the MOSFETs... will need FAN for short run times..that staight white line IS the antenna... about 28cm in height. Im just too lazy to trim it down.. LoL
close up view of the oscillator circuit.. NOW im using UCCxxxx as GDT drivers finally!
here is the half-bridge driver ......im using IRFP450 <fairchild> , my IRFP460(IR) died a few days ago, while powering up from 220Vac.. that was still when I was using discrete gate driver and 1:2 gdt ratio... or that could have been FAKE IRFP460... gdt ratio now is 1:1:1 17T trifilar
the whole setup.. black transformer on the upper left is step down 100Vac transformer rated @ 500watts.. next to it is my variable regulated 12V 1.5A supply (for osc circuit)..the plastic box on the lower left houses the power switch, full wave rectifier, 100uF filter cap, and a 6A fuse.... on the tesla coil side, im using 3T primary (awg#12) with 10mm cleareance PER SIDE of the secondary wall...
picture of streamers at low duty cycle...cant be seen clearly, shutter was too late... streamers could reach 4" to 4.5"...
and now a quick video.. done outside.. still need bigger capacitance value for the power supply anyways.... 100uF is just to small... finally, powered from a 100Vac...
one thing I dont get, the streamers should have looked continuously, not "interrupted", as shown in the video...
I REALLY REALLY need to have a variac!! too bad im poor to buy one..
Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
new primary.. 6T with #12 awg.. and more coupling, happy to know there are no flash overs..
and here is the video... audio not syncing, bad bad video I had to run it in high interruptor rate for a short time because my heatsinks heat up easily... just adjust the "brightness" of your video player to see the secondary coil.. 4" streamers.. NICE!!!
Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
Robert2,
18V zeners? hmmmm Ive read the datasheet for Gate-source voltage, max is +/-30V(Fairchild)..and +/-20V for IR ... Ive got Fairchild mosfets here.... well, no harm in trying :) how about 1:2 gdt ratio?
Madz, regarding heating of the wires going to the primary, its 1mm stranded Cu wire, does NOT heat up... and I ve used bolts/nuts to hold the connection in place, no more alligator clips..
Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
ok here is what ive "learned" so far with my sstc, a comparison with and w/o topload
w/o topload: 1> streamers are ok.. can reach 4.5" 2> not much sensitive to surroundings 3> MOSFETs don't heat up as fast as WITH topload 4> I could easily get high BPS(interrupter)
WITH TOPLOAD: 1> yeah! streamers ARE longer..could reach 6" on VERY slow BPS (2 Hz) 2> kinda sensitive to sorroundings due to TOPLOAD = capacitance 3> MOSFETs make MORE heat 4> I *could* get high BPS rates *IF* I deTUNE the VCO a bit = w/c results in SHORTER streamer length.... If the VCO is *tuned* and give it high BPS, it simply extinguishes them = 1/2" streamers...
so in general, one could select what he wants for an SSTC, with or w/o topload
If I opt to use a topload, I could fascinate friends with longer streamers(at LOW BPS) and NO HIGH BPS(almost like a CW)... but w/o topload, I LOVE the (almost) CW streamers when in high BPS rates... ohhh what to do! what to do!!!
btw, took a video of it with topload... streamers are shorter because I DETUNED it a bit to show the high BPS rate...
hey Steve, THANKS!!!
next time I will try full-wave rectified unsmoothed supply....
My drsstc is runnig almost on CW but i have half-wave rectified mains without filtration. witch gives great results also for a DRSSTC of course u know this video
Registered Member #1773
Joined: Tue Oct 21 2008, 06:56PM
Location: Poland
Posts: 93
raff wrote ...
ok here is what ive "learned" so far with my sstc, a comparison with and w/o topload
w/o topload: 1> streamers are ok.. can reach 4.5" 2> not much sensitive to surroundings 3> MOSFETs don't heat up as fast as WITH topload 4> I could easily get high BPS(interrupter)
WITH TOPLOAD: 1> yeah! streamers ARE longer..could reach 6" on VERY slow BPS (2 Hz) 2> kinda sensitive to sorroundings due to TOPLOAD = capacitance 3> MOSFETs make MORE heat 4> I *could* get high BPS rates *IF* I deTUNE the VCO a bit = w/c results in SHORTER streamer length.... If the VCO is *tuned* and give it high BPS, it simply extinguishes them = 1/2" streamers...
so in general, one could select what he wants for an SSTC, with or w/o topload
If I opt to use a topload, I could fascinate friends with longer streamers(at LOW BPS) and NO HIGH BPS(almost like a CW)... but w/o topload, I LOVE the (almost) CW streamers when in high BPS rates... ohhh what to do! what to do!!!
btw, took a video of it with topload... streamers are shorter because I DETUNED it a bit to show the high BPS rate...
hey Steve, THANKS!!!
next time I will try full-wave rectified unsmoothed supply....
-Ralph
Before start at full power use GDT 1:1:1 and 18V zener with 1n5819 diode ;) This is movie with my h-bridge full power sstc :P
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my 1st SSTC
finally!
I had to run it in high interruptor rate for a short time because my heatsinks heat up easily... just adjust the "brightness" of your video player to see the secondary coil.. 4" streamers.. NICE!!! 
