If you are referring to his Figure 3A - I don't *think* he's using two cathodes. I think the image of two dots with two lines between them is intended to convey that the cathode has physical extent - he describes it somewhere as a "grid of nickel wires" (?) - and the Q pulses swing positive and negative across the cathode when referenced to the center tap of the secondary. This also suggested by figure 3B where the core (again, labeled "15") is just a horizontal line between vertical lines running to the ends of the secondary of T8. Of course I could have missed what you're seeing. Or we could be looking at the same thing and I could be completely missing it. ;-)
With respect to finding the part - the exact part is probably not critical. The circuit design on our blog page doesn't use the same half-bridge driver chip or the same MOSFETs as Godes either, it just produces similar behaviors (I hope). The key points are that it's a radio frequency isolation transformer with a certain turns ratio between primary and secondary. (The fact that it's a radio frequency part supports the whole argument about the Q pulses - it has to pass those higher harmonics as described in the blog page, or the pulses will come out rounded in the secondary, the skin effect won't come into the play to the same effect there, etc.) I found this link: http://www.lintechcomponents.com/product/010478953/F62612H/72656 which might be a starting point for finding or making something similar. Really do be careful. We wouldn't want to lose you. It looks like a 3:1 voltage step-up in the secondary. This circuit can burn a path through your internal organs faster than your muscle fibers can possibly contract to take your hands away. Read up on high voltage technique and think about every action. Always wear eye protection. I once saw a miswired high powered sonar driver blow some of the driver components into little shards some of which became embedded in the wallboard behind the lab bench. This isn't like working on digital electronics. Jeff On Fri, Nov 23, 2012 at 5:54 PM, Jack Cole <[email protected]> wrote: > Thanks for explaining this Jeff. Did you see that he is using 2 cathodes? > What is the difference between the two? > > Initially I was thinking about just trying to replicate his circuit, but > the F626-12 seems to be pretty hard to track down. > > On Fri, Nov 23, 2012 at 5:04 PM, Jeff Berkowitz <[email protected]> wrote: > >> F626-12 > > >
