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RE: DRSSTC III Success 48" arcs from a 12" secondary!

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Dan,
So you decreased the pulse width but increased the current limit to go from 34 to 48 inches. Normally I would think decreasing the pulse width would lower the coil power and make the streamers shorter regardless of the current limit. Perhaps the coil is arcing far early so it never used all the 300uS pulse width anyway ? 

When the coil arcs to ground are you hitting a current limit then ?
I assume you are using a half bridge so the buss voltage lower rail is 0 and the high rail is 340 ?
When you hit a current limit, how long does the coil shut down or timeout? Do you turn back on "instantly" when the current drops or do you put it to sleep for say 1/2 second ?
As you know I am up to something and these issues popped up. :-)) Thanks so much for sharing such great info!! 

Cheers,

        Terry




At 09:24 PM 6/13/2006, you wrote:


Thanks to Part Scavenger . . .

The correct link should be:

http://www.easternvoltageresearch.com/drsstc03_01.jpg

Thanks
Dan




DRSSTC III Success . . .

Well, i have met great success with the prototype DRSSTC III coil i've been
working on for the past year.  Our final prototype is finished and we have
successfully exceeded our initial goal of 30" and we had many hits to a 48"
strike target this evening.

Originally, I had kept my current limit to approximately 550A, and this was
keeping arc length down to about 32-34".  However, once I pushed it up
almost 700A, and reduced pulsewidth from 300us to 100us, i was easily
hitting 40"-48" targets with no problems whatsoever.

I'm sure with increasing the current limit a bit more, i could probably
snake a few more inches and possibly hit 50", but better not be greedy!!!

Here is a photo (composite) of the DRSSTC III running this evening.  The
strike target in the top right of the target is 40" from the break-out
point, and the distance to the cable where the arc at right bottom is
hitting is about 45".

http://www.easternvoltageresearch.com/drsstc3_01.jpg

Not bad from a 12" secondary, eh???

Dan
http://www.drsstcbook.com