"Mark" <[email protected]> wrote in message
news:[email protected] ups.com...
>
> kell wrote:
>> Major Misunderstanding wrote:
>> > A lady just contacted me and says she can hear her Nokia phone
>> > charging -
>> > like a pulsing sound. Nobody else can hear it but when it is switched
>> > on she
>> > registers the sound from some 2-3 metres away. When it is charged the
>> > sound
>> > stops. I also know of another person who can hear similar sounds from
>> > electrical equipment. Could this be a low frequency sound or is it
>> > something
>> > odd happening...? With the charger on it's own she doesn't hear
>> > anything.
>> >
>>
>
> It may be the charger, my daughter can hear the car charger in my car,
> it uses a switching supply up around 19 kHz or something, she can hear
> it, I can't. It a HIGH frequency sound.
>
> Mark
>

Typically its a burst mode charger. bbbrrrzzz, bbbrrrzzz, bbbrrrzzz is
usuall what I hear on the AM.

Cheers