Re: inductively charged LED lamps

"NovySan" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I was wondering if anyone had schematics for a small LED and battery
> that inductively charges by sitting in a cradle and switches on when
> taken from the cradle.  I'm trying to build a much cheaper version of
> the this <http://www.thinkgeek.com/gadgets/lights/5cf5/>. It's called
> a "Candela" lamp.  Anyone ever build one of these?  I've searches Nutz
> and Volts back issues, but no luck.

The inductive chargers seem popular for electric toothbrushes.  Find a used
or discarded one of those and use the charger part.  My guess is that they
run at a high enough frequency to make the inductive coupling efficient.
Maybe between 100kHz and 1Mhz, and possibly a ferrite core.  Just a guess.

-- glen