The UK Home Automation Archive

Archive Home
Group Home
Search Archive


Advanced Search

The UKHA-ARCHIVE IS CEASING OPERATIONS 31 DEC 2024

Latest message you have seen: ?


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: Silent Phones



At 11:56 12/10/00 +0100, you wrote:
>If you put a large enough capacitor across the line to shunt the ring
it
>would have a VERY low impedance at the frequencies where the 9600 baud

What I had in mind was an L-C-R series resonant circuit across the line,
basically a 16 Hz filter.  However, I hadn't thought about some phones just
electronically detecting the ring signal and then starting up their own
ringers, it probably wouldn't be possible to shunt the ring enough to make
it undetectable without upsetting the line in other ways (unless they use a
diac or something so it doesn't trigger till it gets to 32V or so)

> current from the exchange whilst ringing that it would ring trip the
call
>just as if you had lifted and dropped the receiver.

I'd rather that feature was CLID dependent :-)

Nigel


-------------------------- eGroups Sponsor -------------------------~-~>
Tellme Sports. Tellme Stocks. Tellme News. Just Tellme.
http://click.egroups.com/1/9530/9/_/2065/_/971349636/
---------------------------------------------------------------------_->





Home | Main Index | Thread Index

Comments to the Webmaster are always welcomed, please use this contact form . Note that as this site is a mailing list archive, the Webmaster has no control over the contents of the messages. Comments about message content should be directed to the relevant mailing list.