How to Make a Negative Ion air ionizer

Step 2: Full-Wave Ionizer Materials and Component Layout

Materials required for full-wave version:

• 2 x 10meg ohm resistors. (limit output current for safety)
• 40 x diode 1N4007.
• 30 x capacitor 100nF 275V class x2 suppression.
• 1 length 350mm ega tube trunking.
• 2 ega tube end caps for trunking.
• 4 x self tappers for end caps.
• low amperage hookup wire, ATX power supply type wire is fine.
• 1metre 3 core 220v ac lead.
• standard pins (or carbonfibre) for high voltage grid.

Optional components

• 60mm x 60mm 12V dc fan, old cpu fan works well.
• finger guard for above fan.
• old cellphone charger +/- 5V dc to power fan.
• small switch for fan, necessary for silent operation.

Comments

[8v92]

Good componet layout , It would supply more output current if ground was replaced with neutral on center terminal and live was connect to both outside terminals so you have two crockoft walton voltage multiplers in parralel. At 220 vac output voltage is around 4750 volts DC . With 30 capacitors a 15 stage unit (single multi[pler) could be built that would put out 7250 volts DC. Also all capacitors after the first stage diode have at least 500 volts DC acrross them but the type of capacitor used can take some overvoltage. With a few changes this unit could also remove smoke and dust from the air (electrostatic precipitater).

[petercd]

sweet, thanks for the heads-up.

Dust removal was also a priority, but negating the ozone produced would be a concern. I suppose the easiest would be to leave it on in the day when I'm at work and simply switch it off when I come home again.

[8v92]

Whenever a conductor with sharp point/s with a high voltage potential of one polarity is near a conductor of opposite polarity ionization and corona discharge occur that produces the o3 molecule or ozone. If you smell an earthy plowed field oder near high voltage equipment that is ozone. In an electrostatic presipitater air flows through a metal screen connected to ground or in this case + to remove any negative --- charge on the dust so it will be attracted to and stick to a wire several inches away from the screen that has a negative charge on it (opposite charges attract) because the screen and wire are not close there is little or no ozone produced.

[CyborgGold]

What wattage shoudl the resistors be, I searched online and found them in 1/2W, 1W, and 2W

[petercd]

1/4 W is fine, so 1/2W is more than adequate. The current consumption is extremely small working out to about 2mW in the usb version and around 5~10mW in these versions. The brushless fan consumes 89mW and is the major current draw in this device.

[CyborgGold]

Thanks for the help!

[Treknology]

This approach is NOT recommended in Australia! The connection to Earth should trigger a Leakage Breaker immediately the device is plugged in. One is recommended to use a standard full wave rectifier and then use that out put to drive the "half wave" version of the circuit.