I could've sworn I replied to this. Anyway, my design uses an LM3478 and an AO4294 - a combination I have used on many boards with different transformers - and fits on a 17mm diameter board. However driving an IN-18 at 155V/6mA the transformer gets very hot! This particular board doesn't do any snubbing on the primary side though.
I have experimented with quite a few different transformers and the design is really quite sensitive to the transformer being used. Interestingly, I have found that a lower winding ratio generally works better I.e. I get better performance with a 1:5 transformer than I do with a 1:10 or a 1:20. I suspect, but can't prove, that this has a lot to do with ringing on the primary, which is worse with the higher ratio transformers. I also tried one of the LT isolated switches and got nowhere fast with it. One interesting thing about these is that they require a minimum output current draw, something I don't like for a Nixie tube application where you might want to turn the tubes off, and I include dimming in this, where you are turning the tubes off and on very rapidly. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/75711b63-833a-435b-92a6-89f108a6b8fb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
