🚀 go-pugleaf

In article <f7d9a152.0209121216.799e7e53@posting.google.com>, jason_hsu@my-deja.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
>chassis.
>
>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.
greg

GregS <szekeresREMOVE@pitt.edu> wrote in message
news:alqu5t$73q$2@usenet01.srv.cis.pitt.edu...
> In article <f7d9a152.0209121216.799e7e53@posting.google.com>,
jason_hsu@my-deja.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
> >chassis.
> >
> >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.
> greg

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
http://www.kronjaeger.com/hv/hv/src/mul/

In article <f7d9a152.0209121216.799e7e53@posting.google.com>, 
jason_hsu@my-deja.com says...
>
>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
>chassis.
>
>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.


PSPICE will be essentially useless for this, and in any case can not be 
considered as s substitute for understanding the principles of high voltage 
power supply design.

Bob.

"Jason Hsu" <jason_hsu@my-deja.com> wrote in message
news:f7d9a152.0209121216.799e7e53@posting.google.com...
> 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
> chassis.
>
> 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.
>
> Jason Hsu, AG4DG
> usenet@@@@@@@jasonhsu.com

there used to be a DSE kit.

Used 240v straight from the wall,
into a cockcroft walton multiplier circuit.
Only protection was a couple of resistors to limit the current.

It claimed to produce around -8000kv
using 22 stage cockcroft walton multiplier.
(But unless I'm doing the sums wrong the max output could not
have been more than around -3.2KV)

Kit got pulled as it was rather dangerous !!
My first electronics kit(1986 at age 14).

With a few modifcations works very well as
power supply for small rail gun.

Either do a web search or
have a look from a book called
Laser, Phaser,ion ray guns and other
working space age projects by R.Iannini

(I got given a copy at 14)

Or any book on the construction and design of particle accelerators
especially the power supplies.

If your in the USA
instead of cockcroft  walton generator,
you would be able to purchase
some high voltage diodes (10 - 30KV)
(sort of components on the resistricted export list)
and use a modified tv flyback transformer.

IIRC, Ramsey Electronics makes a kit.



Jason Hsu wrote:
> 
> Exactly what voltage and current levels do I need?
> 
> I would like to build a negative ion generator.