These two ghosts are powered by this circuit. They have about 28-33nF of cable in each. They ran about 290-300Vpp, instead of the full 360Vpp. I lowered frequency to 1kHz to help voltage.
Here is the schematic. The best inductor and MOSFET choice has not determined. There is a very simple assembly code frame work attached as well. The code, inductor & MOSFET are all related, and must be optimized. But the code was very simple to change.
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10/14/2018 at 02:01
Video of a AA battery EL inverter next to the quiet one. i don't know the brand of the batter powered one, I know it is very common. I took the video on my phone, the picture are not awesome but it does show the difference in noise level.