Mebart wrote in message
...

[snip]

The Customs department confiscates these things as they catch them
coming into the US, and the FDA shuts down sellers when they find
them. But, small time sellers (such as ebay sellers) fly under the
radar and seem to get away with it.

Not if you report them. IIRC, Ebay has some clause in their Terms of
Use that says that the seller is not allowed to sell an item that breaks
the law. Things like 'email leads', just another way of saying email
addresses for spammers, are illegal, so some spammers are selling the
service where you pay for so many email blasts, and the seller does the
blasting. But it's still illegal if you go by the law(s) that say that
it's illegal to 'blast' spam to recipients without giving them the
ability to unsubscribe. Anyway, if these ozone devices are prohibited
or confiscated based on some federal law, then if they are reported to
Ebay and the report gives the law that is being broken, they should then
shut down the auction.

For awhile at least, until the BOFH sellers find a way around it.

I'm interested in the driver circuit itself, which doesn't seem to be
documented. I know about the constant current mode which varies the
frequency of the driver in order to regulate the output current. I'm
interested in ultra low power high voltage generation, so want
something that is efficient and runs in constant voltage more (by
fixed frequency operation at the resonant frequency, and by varying
the sine wave input drive signal amplitude). I think driving it with a
sine wave avoids the ZVS problem that plaques square wave input signal
operation. As far as I know, this means 'I have to roll my own'
driver.

From my experience, I would say that after a few tens or hundreds of
hours of operation the dust and pollution buildup reduces the resistance
of the insulation, and causes the high voltage to drop to some
ineffective level. Then it's necessary to clean the dust off, or else
use higher power to overcome the resistive drop. In any case, it seems
that low power has some serious drawbacks.

My guess is that this is how the personal ozone generators operate,
although they probably aren't as concerned with efficiency of the
driver as I would be.

M