Re: telephone rings at night

On Mon, 7 Aug 2006 18:49:25 -0400, "EXT" <noemail@xxxxxxxxxxxxxxxxxxx>
wrote:

Are you sure it is 90v AC, in my checks to build a phone ring detector many
years ago, and in internet research I have found that the ringer is 70 to
90v pulsed DC not AC. The actual phone runs on 12v DC.


If the ringer used DC, those ring-control cords wouldn't work. Such a
cord uses a full-wave rectifier.

The AC ring (75VAC here) is on the same wire as the 50VDC talk
voltage. The combined voltage would vary from -25V to +125V (50+-75).
Removing the AC component allows the phone to work but with no ring.


"Handi" <handi_ca@xxxxxxxxxxx> wrote in message
news:f0JBg.36269$pu3.475332@xxxxxxxxxxxxxxxxxxxxxxxxxx
WoW!, this generated a lot of responses.

I'm not a telephone engineer however I am an electronic tech.

Basically a telephone rings because of the presence of a ninety volt AC
signal sent out from the local toll office. You phone rings because of
that voltage being present.

I suggest that Bell South connect a simple recorder to your phone line for
a period of time to see the level of the "ring" voltage and
time/frequency. Its easy for stay voltages to be induced into wires,
that's likely what's happening in your home.

Your home (and phones) are not possesed!

I understand why the BS technician gave you his cell & home numbers. This
has become his quest. I myself have often had puzzling technical problems
that have stumped me. Typically when I do find the solution it's one of
those "Why didn't I think of that?!".

Please let us know what the final solution is.

Handi_ca


--
Mark Lloyd
http://notstupid.laughingsquid.com

"Democracy is two wolves and a lamb voting on what
to have for lunch. Liberty is a well armed lamb
contesting the vote." - Benjamin Franklin
.

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