Scott, Thanks for the nice answer. Barry Ma ------------- On Tue, 26 September 2000, "Scott Lacey" wrote: > Barry, > > These use magnetic coupling to transfer the charging energy. In essence, the > transformer secondary is inside the toothbrush handle, along with the > rectifiers and rechargeable batteries. The older models used line-frequency > sine waves and tended to get warm (but not hot). Many of the newer models > use high-frequency (tens of kilohertz or higher) square waves and do not get > warm while in the stand. > > As for safety, the lack of exposed contacts is a great advantage. Battery > chargers can deliver substantial current - enough to cause burns to a > curious child probing them with a pair of metal tweezers. > > Scott Lacey
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