Here is my version of corona maker. Made from thin bare wire wound to insulated wire. The induction will force corona to come out the thin wire. Since the one that insulated do not exposed to air, only corona made by thin wire produce ozone. And if your driver circuit produce DC dominant HV you can make it produce mostly negative ino by connecting the coil the correct way.
Use neon bulb to check current direction. only leg with negative current in the neon will lit.
one way to wound it:
the corona, not very clear unfortunately, my webcam can not capture it well. Run at about 600mA at 10V.
Edit:
Now I use insulated wire as positive wound over a bare copper pipe as negative.
Slight modification to the circuit:
Use neon bulb to check current direction. only leg with negative current in the neon will lit.
one way to wound it:
the corona, not very clear unfortunately, my webcam can not capture it well. Run at about 600mA at 10V.
Edit:
Now I use insulated wire as positive wound over a bare copper pipe as negative.
Slight modification to the circuit:
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