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Registered Member #810
Joined: Wed May 30 2007, 05:23PM
Location: Quincy MA
Posts: 17
Hi Guys, Have heard a lot of great things about SISG coils and was wondering what it would take to convert my current coil (4" 1000 turn secondary, 12K/60ma NST etc) over.
Also was wondering if I can use Java TC for a SISG coil....
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I think all you would have to do is replace the spark gap with the sisg module. I am quite sure any sgtc calculator will work fine, the only difference is the spark gap which will not change anything. Same tank cap and everything.
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Just MAKE SURE OF THE CURRENT! Or your SISG-module can fail due to pulsed overcurrent - the IGBTs can handle some overload even above the given pulsed current value from datasheet for such a short time the SISG firing takes, but it's still not unlimited.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Also, every SISG I've ever seen was DC only. They only "spark" in the forward direction, and conduct in reverse like a diode. You'd need a high voltage rectifier for your NST.
Registered Member #810
Joined: Wed May 30 2007, 05:23PM
Location: Quincy MA
Posts: 17
Thanks guys for all the great info....
Am using boards that I got from Mark Dunn so nothing too exotic or different from the standard approach that everyone else seems to be using.... 12KV will need a lot of diodes to rectify so am thinking it might be simpler to just go with a rectified MOT (similar to the piranah)....
One quick question though..... With a rectified MOT/SISG configuration will I need to use a different capacitance value for my tank circuit.... I assume that the tank/primary/secondary/topload is already tuned as a resonant system and therefore should not need to be changed for a different charging/trigger system... Is this the right thought?
Am trying to avoid any part of the upgrade that does not need to be changed so I can have the SISG upgrade in place for halloween...;- )
Much appreciate the benefit of your experience and insight.....
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Converting a SGTC to SISG
