Subject: Re: Negative ion generators
Summary: You know, it's really been a long, long time...
Sender: Tut AmongUs
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Date: Tue, 17 Sep 2002 11:45:07 GMT
NNTP-Posting-Date: Tue, 17 Sep 2002 07:45:07 EDT
On Fri, 13 Sep 2002 02:23:34 GMT, "Steve Andrew"
>GregS wrote in message
>> In article ,
>email@example.com (Jason Hsu) wrote:
>> >Exactly what voltage and current levels do I need?
>> >I would like to build a negative ion generator. From what I
>> >understand, a negative ion generator has a very high voltage
>> >(thousands) and a very low current. This voltage is fed into a
>> >very-high-voltage diode (oriented to pass the negative voltage but
>> >reject the positive voltage). The resulting very high negative voltage
>> >is fed into a very sharp object (such as a sewing needle), which
>> >injects the negative ions into the air inside the chassis. A nearby
>> >fan disperses the negative ions into the air in the room outside the
>> >Exactly what voltage and current levels do I need? (I also realize
>> >that I must simulate this in PSPICE, because the tiny current levels
>> >and huge voltage levels aren't in a range that regular multimeters can
>> >handle.) I have heard that using too much power will produce ozone,
>> >which is poisonous.
>> Emulate? A good potential is 6-9KV. Current is microamps, maybe
>> 50-500 depending on the emitters and grounds nearby. A DC source is
>> However which way you do it, diode, diodes. Negative of the supply goes
>> to the emitters, needles, wire brush, etc. The positive terminal gets
>> referenced to AC ground. Its a good idea or necessary to add series
>> resistance, so a finger on needle will get less than 1 Ma. preferably less
>> than 500 microAmps. A fan is unecessary. It blows air anyway. A fan
>> can be used to force surrounding air through and land upon a slighty
>> conductive element or just metal. The debris just sticks to all you walls
>> otherwise. It will do it anyway. If the voltage is too high or a ground is
>> too close to the needles, an arc can try to occur which will produce
>> Ozone. Ozone needs carefull attention but is an otherwise
>> excellant odor eliminator, preferably used in an unoccupied space,
>> or while you are away. You like the smell of the sun through a window?
>> Ion generators can reduce odors slightly.
>I've seen ion generators running directly of 240VAC mains supply using
>something like a Cockcroft-Walton or Villard voltage multiplier. You can get
>a circuit for the more commonly used Villard cascade multiplier from
Some nice multipliers can be seen on alt.binaries.pictures.misc