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Posted by NoSpam on September 2, 2008, 3:27 pm
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Tony Jeffree wrote:
> On Tue, 02 Sep 2008 16:28:18 +0100, Chris Edwards
>
>>
>>
>> There used to be a series of sayings.. "You know you're getting old
>> when....." followed by something like ".....you bend down to tie your laces
>> and wonder what else you can usefully do while you're down there"
>>
>> Today I realized how quickly one can get left behind by the pace of
>> modern technology - blink and you've missed it! Earlier, I casually picked
>> up an electric toothbrush belonging to a friend. It was seated onto a
>> small plastic pedestal which was wired into the mains, and obviously
>> contained a charger. The connection between the brush body and the charger
>> was by means of a solid plastic spigot on the charger being entered into a
>> socket in the base of the plastic body, there was no metal to metal
>> connection of any sort.
>>
>> I assume the body contains a rechargeable battery. How is the
>> current passed into the brush body to recharge the battery - by induction?
>> Do any other products work this way? How much current can be transmitted?
>> How long has this technology been available?
>>
>> Sigh......I have absolutely no idea how this thing works, what
>> else have I missed? Will the horseless carriage catch on? Answers on a
>> postcard, please...... :}
>
> Think of it as a two-part mains transformer...the primary is in the
> base that plugs into the mains and the secondary is in the bottom of
> the toothbrish handle. The plastic spigot is almost certainly hiding a
> soft iron armature of some kind under its plastic skin.
>
> No magic involved...no "new" technology...the currents will be low -
> trickle-charge level.
>
> Regards,
> Tony
I changed the battery in mine a while ago and was surprised to find a
pcb with an IC and several components to control the charge rate. My
shaver has an LCD display with charge level and suggestions about when
it needs an ultrasonic clean.
Chips with everything!
Dave
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>
> There used to be a series of sayings.. "You know you're getting old
>when....." followed by something like ".....you bend down to tie your laces
>and wonder what else you can usefully do while you're down there"
>
> Today I realized how quickly one can get left behind by the pace of
>modern technology - blink and you've missed it! Earlier, I casually picked
>up an electric toothbrush belonging to a friend. It was seated onto a
>small plastic pedestal which was wired into the mains, and obviously
>contained a charger. The connection between the brush body and the charger
>was by means of a solid plastic spigot on the charger being entered into a
>socket in the base of the plastic body, there was no metal to metal
>connection of any sort.
>
> I assume the body contains a rechargeable battery. How is the
>current passed into the brush body to recharge the battery - by induction?
>Do any other products work this way? How much current can be transmitted?
>How long has this technology been available?
>
> Sigh......I have absolutely no idea how this thing works, what
>else have I missed? Will the horseless carriage catch on? Answers on a
>postcard, please...... :}