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Re: Jim Mitchell SSTC help!
Original poster: "Jim Mitchell" <Electrontube-at-sbcglobal-dot-net>
Yeah, that is if you want interupted operation, and you risk mangaling the
board. The interuptor is not always desireable, for one, it's LOUD and
you can't just run your coil anywhere without the noise. Two, it doesn't
give the sword like hot spiral streamers that many people desire.
Also if you're running half wave rectified AC, you will need the 555 timer
to kick the coil back into oscillation, because it can die out.
Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
Sent: Monday, June 21, 2004 10:03 AM
Subject: Re: Jim Mitchell SSTC help!
> Original poster: Fucian-at-aol-dot-com
> I have the same board and mine works great. Mine was working awful until i
> made some mods to it though. It sounded just like yours....
> 1st-Throw out the 555...You wont need it after im done with ya ;-)
> 2nd-Place a jumper wire from pin 3 of BOTH UCC chips. This is the enable
> 3rd- Build an interruptor based on the 555 seperate from board. Run a wire
> from its output to the jumper wire connecting your UCC chips.You can use
> the 5volt reg to power your interruptor as well. there is an empty hole
> that will allow you to run a wire this way. This interruptor will save
> UCCs as well as your bridge and give you much better output!
> 4- Put a small heatsink on top of the UCC chips and make sure your
> regulators have good sized heatsinks, just incase yuo go nuts and turn up
> the interruptor too much;-)
> 5-Check your GDT waveforms again and MAKE sure you are getting a decent
> wave...Also, make sure the GDT is phased right. If not, you will burn
> things up.
> I am currently running a fullbridge of IRFP460s with this driver. It
> gets warm, even at high power. I have a small(4in by 9in-28awg) secondary
> and a 3 turn primary. I am getting about 12in max POWERFUL arcs. UCCs get
> warm. Whats your half bridge look like?
> I am here to help in any way possible!Hang in there, Jim's baord does