Message-
From: Barry Ma
To: emc-p...@majordomo.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Monday, September 25, 2000 6:18 PM
Subject: Re: Battery Safety
>
>Chris' email reminds me of a relevant question:
>
>The charging stand for a battery-driven toothbrush (Sonicar
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 rechargea
Chris' email reminds me of a relevant question:
The charging stand for a battery-driven toothbrush (Sonicare) has no contact
with the toothbrush. What is the charging mechanism? Is it safer than other
battery?
Best Regards,
Barry Ma
Chris:
Is the battery a rechargeable? Have you tried disconnecting the 91K
reisstor and measuring the resulting voltage increase? Doesn't make sense
to me.
Ralph Cameron
EMC Consulting and Suppression of Consumer Electronics
(After sale)
- Original Message -
From: "Maxwell, Chris"
T
I've seen this resistor used for the low battery alarm circuit. It keeps the
battery voltage from rising as load is shed and confusing the low battery alarm
circuit. There is no safety reason that I know of. 91K ohm is an odd value
though, left overs from another product? I'm assuming that the n
Hi,
I've seen this done before on low current designs. Sometimes when you
replace the batteries in this type of design the circuit voltage does not
have time to drop completely away due to the charge saved on bulk
capacitors. When the new batteries are added the circuit comes up in a
peculiar sta
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