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Re: CGA Monitor Flyback ???
Hello, Nick, and all
On Fri, 25 Feb 2000 16:38:44 -0700 Tesla List <tesla-at-pupman-dot-com> writes:
> Original Poster: "Megavolt Nick"
> <tesla-at-fieldfamily.prontoserve.co.uk>
<snip>
> Commercial plasma globes use a cockroft walton multiplier to create
> the HV.
They do? I thought that a plasma globe needed high frequency AC to
operate. A voltage multiplier will give pulsed DC... and are you
referring to -very- large globes? I've had a chance to see the schematics
for some commercial supplies, as well as the actual supply from an 8"
unit, and none used voltage multipliers, and had no diode as in TV usage.
> There is a few megs worth of limiting resistance on the output.
This reminds me of something. I've made a few small plasma globes using
5" clear glass lightbulbs and <50W flyback supplies. While they work
alright, if I arc the HV from the flyback to the lightbulb base, then
stretch the arc till it is almost at breaking point where it sort of
"destablizes", the arcs in the bulb suddenly increase in amount and take
on a look far more like commercial globes. Might this be due to some
pulsed nature of the arc at that point, or some extra resistance?
> If you place a metalic object on top of a plasma globe you can draw
> small
> saprks from it.
>
> Regards
> Nick Field
TT-Y'all-L
Grayson Dietrich
http://www.electrophile.8m-dot-com
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