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Re: CGA Monitor Flyback ???
Hi All,
just my 2c. TV flybacks are not in the least bit 'painless' -
they leave a very nasty burn. Skin conduction has nothing to do with it,
particullarly at 8kHz.
Flybacks can be run at surprisingly high power levels, if you cut away most
of the case, remove the diodes, run them under oil with a new primary. They
can easily cope with 500W and I've managed to get 2kW into them - although
at that power level after a few seconds they literally explode, they put out
really hot 3" arcs until they do. (new record for flyback spark length?)
Commercial plasma globes use a cockroft walton multiplier to create the HV.
There is a few megs worth of limiting resistance on the output.
If you place a metalic object on top of a plasma globe you can draw small
saprks from it.
Regards
Nick Field
> Original Poster: "Jan Florian Wagner" <jwagner-at-cc.hut.fi>
>
> Hi,
>
> > I have been playing some weeks ago with a TV flayback for my kid's
plasma
> > globe. I had it fed by a TV transistor, driven by a variable oscillator,
> > using only 60 VDC. I found maximum output at 8 kHz and 16 kHz.
>
> Now, this get's maybe a bit OT from Tesla coils, but if in all those
> plasma coil driver schematics and "solid state TC with TV flyback", the
> flyback really runs at so low frequency, is it safe/painless at all to
> touch the TV flyback driven plasma globe? I had the impression the
> commercial globes operate at RF - and could be touched due to "skin
> effect" i.e. nerves not responding.
>
> > >When you connect the flyback directly to the mains, it will
> > >just act as a normal step up transformer, not like a flyback.
> > You got to explain this to me: a flyback primary is less than 10 ohms
and
> it is
> > supposed to be supplied with pulses. Connecting it to the mains (in my
> opinion)
> > will simply result in a stinking smoke cloud within a few seconds. Am I
> wrong?
>
> Sounds pretty ok, it'll burn up if connected directly to mains. OTOH, if
> there's that variac the guy used to control the TV flyback, and if he set
> power to real low (variac as voltage divider, and tapped variac part
> impedance much less flyback impedance), then the flyback could have
> miraculously survived. Maybe even operated somewhat well as he said.
> (I don't recommend this mains to TV flyback in any way though.)
>
> Or is there a difference between monitor and TV flybacks? Dunno...
>
> --
> *************************************************
> Jan Florian Wagner
> http://www.hut.fi/~jwagner
>
>
>
>