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Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
I wonder if you guys can help me? I've just completed building a small DRSSTC Specs are:- Secondary...7.5 x 2 inch wound with 36 AWG primary.....2.75 inch wound with 12 AWG Toroid ....1.75 x 6 (john Freau one) Full bridge of 40n60A4D IGBT's (yeah over kill!) Steve Wards driver circuit with primary feedback and OCD. a LED peak current detector.
The coil seems to favour its 4th turn of the primary for maximum spark output at low voltage.
My problem is......the coils maximum output at full 240 volt mains in, is only 3.5 inch! I have tried reversing the primary feed back conections, but then its spark output is even smaller. I have also tried reversing the primary coil.....but seems to make no differance at all.
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
My interrupter ON time is variable from 50uS to 150uS....BPS is adjustable from 2mS to 8 mS..........playing around with the interupter seems to make very little difference to spark length with this coil.......its maximum output is 3.5 inch to ground. My primary feedback coils (two cascaded 33 turns per coil) are only half an inch in diameter....my last coil used the comonly used 1.1 inch ones FT-114A-77.....and they worked fine!........could it be that these smaller ones might hinder performance?
My storage caps are 3 x 470uf caps in parrallel....no doubler arrangment, mains voltage is 240 volt.
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
Hi Terry, Thanks for the info, I punched in my parameters of my coil to the JAVA TC calculator, its frquency is 392KHZ, and gives my primary coil turns of 4.95 for the same frquency, coupling is 0.157. I tuned my primary at 4.5 to 5 turns......spark output is about 2 inch.....1.5 inch lower than when it's tuned to turn 4, which seems to be its maximum. I think i will try my driver on another coil to establish whether its a driver fault, or a coil fault.
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Help with Small DRSSTC
