[BC] "live" feeds

[Dana Puopolo]

With two pairs you can do some pretty sexy things. You can send stereo from
the remote. You can simplex a mono feedback/intercom audio channel by using
the center taps of the four windings connecting to the lines (and using two
more transformers). Finally, you can simplex an order wire between the mono
line and ground. THEN you can diode steer the relays. Five things, all on two
pairs!

-D

------ Original Message ------
Received: Thu, 01 May 2008 08:03:46 AM EDT
From: DHultsman5 at aol.com

For many years we used a "Dry-pair"  telephone line to most of our  remotes
to allow talk=back and cue to the announcer at the remote site.  We  always
used a d.c. simplex to ground with a button at the remote location to  allow
the remote announcer to start the first cartridge machine of a stop set.