From: szekeresREMOVE@pitt.edu (GregS)
Subject: Re: Negative ion generators
Date: Thu, 12 Sep 2002 20:44:37 GMT
NNTP-Posting-Date: Thu, 12 Sep 2002 20:41:33 +0000 (UTC)
X-Newsreader: News Xpress 2.01
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 needed.
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.