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Registered Member #1637
Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83
Does anyone know any details on Ward's new awesome coil design? Is it just DRSSTC with extra long ringup, or, maybe, he really controls DC bus to grow plasma channel?
I want to know extra details on this extraordinary coil!
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
I had very similar results to steves coil while testing my interupted sstc. No where near the output length though! That is a most impressive coil, I must say!
I codenamed the entire set-up "Prancing Sword", as the output was a single branching sword spark which at the right interrupter frequency gave off the illusion of dancing.
It was a PLL driver ala Mr. Conner, filtered half-bridge. I am sure that Mr. Wards system is much more complex than what I had set-up, mine seemed to mimic his coil to a great extent, too bad I never got around to adding a resonant capacitor. What I do remember is that a very specific coupling/primary geometry, phasing and PLL pot setting was required for the prancing sword, anything off the "ideal" just resulted in regular ISSTC output. Seeing this coil makes me want to revisit the project and add a resonant cap...
Registered Member #1642
Joined: Sun Aug 17 2008, 11:36PM
Location: Black Canyon City
Posts: 96
Yah, I took a close look at Steve's incredible coil at the Teslathon. Very ingenious and clever. I believe he's using a 4CX250B tetrode mounted on a liquid cooled heat exchanger for the modulator along with a really big SCR for the pulsed audio. Brilliant! Way to go, Steve!
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Dr Hankenstein nailed it on the head! Good job
Im not terribly eager to give out the details of the build, its really quite complex compared to any other project ive posted before. The thought of documenting it to the point of it being copy-able isnt really my idea of fun. Sorry guys, i just dont have the time for this stuff lately.
Conner explained it correctly, i modulate the bus voltage into a "high-impedance" DRSSTC operating at 350khz. The fact that i can operate with 16mS long ramp pulses (its arbitrary in fact) allows for 54" sparks from the 9" resonator.
Theres some more pictures of the system as it developed on my flickr page:
In a year from now, this will be the standard and we will all be waiting for the next cool tesla coil
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I have heard about this coil, but i have never seen it. My jaw dropped, and i got reallly pissed that i could not have come up with it.
That is amazing as hell!
Only a few questions, i promise. Unless you want to have the only one (i would have done it that way...).
Is this nearly the same driver and power/tank section of a drsstc? Is the main difference the control of the buss voltage?
I have absolutely no idea how you did this, which pisses me off . But, it pisses me off in a 'good' way. I need to do random things like cramming bananas into the buss bars on IGBTs and stuff to see if i could come up with something.
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Steve's Q.C.W coil design
