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Registered Member #4078
Joined: Tue Aug 30 2011, 12:53PM
Location: Sydney, Australia
Posts: 19
When floating, the generator is going to hover around 1/2 the max voltage with respect to ground, both positive and negative. This will also reduce the tendency for corona discharge.
On the downside, it means the ground terminal of your flyback is also at high potential with respect to the low voltage side, so can arc over. Particularly when firing, as the ground terminal could be anywhere between 0 and the full output voltage from ground.
The arcing resistors are probably a side effect of the corona loss - current will constantly flow out the corona, which will create a voltage across the resistors (ohms law).
If you want to improve performance, you can do a couple of things:
1) Use some silicone sealant on exposed metal to reduce corona. 2) Run the generator in bipolar mode (and grounded). This will ensure no more than half the voltage will appear anywhere on the generator, both when charging and when firing. Bipolar mode is easy - just charge the generator from the middle rather than the bottom (and ensure the smallest gap is here too)
Thank you for your answer, it really helps me to understand what is at stake.
In fact, to convert the marx to a bipolar, I just have to remove the fourth spark gap, and put the power supply there, whitout forgetting the ballast resistor
Oh wow :) that is awesome! Hm... I have like a million page protectors lying around my house, and (though I am out of it I can esily obtain it) I can get aluminum foil and I am in a desperate need for capacitors, about 15nF worth. I still do not understand how you made the capacitors. Can you please explain again so I can make them so I can finally finish my SGTC? Also, do you need to dip them in oil? if so, what type of oil? I do not have access to cap oil... only cooking oil but I heard that works as well but won't it ignite?
:3 BTW epic marx generator, I was telling my dad just last night, "Who doesn't want a marx generator?" after he was talkin about travelling to Munich, a place I went before and saw one...
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Marx generator with homemade capacitors
