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From: clark@beaver.cs.washington.edu@ssc-vax.UUCP
Newsgroups: mod.telecom
Subject: Hold circuit
Message-ID: <8701210710.AA19514@ucbvax.Berkeley.EDU>
Date: Wed, 14-Jan-87 17:34:41 EST
Article-I.D.: ucbvax.8701210710.AA19514
Posted: Wed Jan 14 17:34:41 1987
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I was thinking some more on the topic of hold circiuts and
remembered that there was a article in a Popular Electronics a few
years back that looked like a very good setup. It was an active type
design, powered off the 120V line, which listened on the phone line
for the '#' key. When this key was detected, a relay was activated,
switching an audio transformer/resistor network across the phone
line. This caused an off hook condition that held the line. The
reason for the transformer was to provide the option of music on
hold, by connecting a tape player or what ever. The controller in
this design monitored the phone line, sensing when any phone was
taken off hook, deactivating the hold relay. In addition, the
controller had a time out that forced the hold function to switch
off after about five minutes so that the line would not be tied up
all day.....

I was going the build the thing, but never got to it....
Any comments for someone that did build and test it ????

Roger Swann		uucp: uw-beaver!ssc-vax!clark