0sditype 10 years ago I made an Ozone generator with a neon sign transformer as follows. *** DEADLY WARNING # 1 High Voltage can Kill you! **** It's always best to keep one hand in your pocket when around HV so your heart won't be in the current path if you become part of the circuit. Needed: Neon transformer, acrylic tubes, variac, foil, screen, wood, nails, tape and probably a lack of normality. HERE IS HOW I MADE MINE: Take the two HV output wires (solid conductor spark plug wire should work) from a neon transformer and fasten them along a 2X2 wood stick about 15" long. My transformer is 7500V, 150VA and has its center tap internally grounded. Each lead was wrapped to a 2" nail protruding out the end of the stick. The nails are about and inch apart and slightly spread open. At this point I was able to generate an arc. I took a 5" acrylic tube about 18" long and taped metal foil arond the outside and lined the inside with copper screen, I just rolled up the screen and slid it in. I then added 4 stips of thin wood perpendicular to the wood stick to form a H to hold the pole in the middle of the acrylic tube. I connected one nail to a wire on the screen and ran a wire from the other nail around the end of the tube and wrapped a bit foil around it. The tube forms a capacitor which is in series with the transformer's inductance. When turned on the arc at the nails was 3 times stronger. This might short out the secondary coil so I used a variac (varible AC transformer) on the 120V input to the neon transformer to adjust the output to below the arcing threshold. I also checked with a clap on ammeter that the current draw was less then an amp. The unit is rated at 150VA so you don't want to exceed this rating. I attached the wood stick to the transformer and slid the whole thing into a large 10" diameter acrylic tube for protection. - done. ***** DEADLY WARNING # 2 OZONE IS NOT SAFE TO BREATH ***** **** DEADLY WARNING #3 OZONE MAY KILL YOUR PETS AND PLANTS *** When turned on there is a buzz and a purple glow between the foil and screen layers and the smell of lots of Ozone. I pointed the device into my AC return air stream and left for a couple hours. After airing out the house very well the bad A/C smell is now gone. ( I did preciously clean the A/C coils but the smell had returned.) Good luck.