Sid Weaver wrote:
>
> kooter@012.NET.IL writes:
>
> > Can anyone explain what is really a "ballast" ?
> > I saw some circuits that mention it as "choke" and sometimes as a
> > "transformer"...my non-technical dictionary refer to it as something not
> > relevant to electric..
> > what is exactly? when to use that word & regard to what?


> A "ballast" is the special transformer located in flourescent light fixtures.
>  As far as I know it is not used in electronic project, only flourescent
> lights.


It's probably more accurate to describe it as a "choke"
and not a transformer. Its purpose is to limit the AC
operating current of the tube once it is ionised
into conduction. You can even use a capacitor to do
do the same job, in the right circumstances.
See this 4W fluoro tube driver;
http://www.romanblack.com/tube4w.htm
:o)
-Roman

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