> You'll find your Sonicare Ultrasonic toothbrush has a PIC in it.  A 12Cxxxx IIRC.

Aha!  I knew there was something inherently attractive about it.

> It generates a ~~1MHZ acoutstic pulse on top of the ~~2 khz mechanical 
> oscillation, or thereabouts.  I know this because I had to measure the ultrasonic 
> part of it.
> 
> The induction charger is pretty cool, and simple.  Allows the toothbrush to be completely sealed agaist water and still charge.  You'd have a devil of a time getting it apart since some parts are sonic welded.  I had to cut them apart when I was testing them.

I'll just have to keep an eye open for them at garage sales, then.  Do
you happen
to recall how smart the charging circuit is?  If I leave it in the
charging cradle, will
it slowly kill the NiCad, or is it smart enough to throttle back the
charge current?

Mike H.

> -- Lawrence Lile, P.E.
_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist