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How do I detect telephone "off hook" condition?
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 More options Nov 13 2012, 4:34 am
Newsgroups: sci.electronics.misc
From: robbiedca...@gmail.com
Date: Tue, 13 Nov 2012 01:34:50 -0800 (PST)
Local: Tues, Nov 13 2012 4:34 am
Subject: Re: How do I detect telephone "off hook" condition?
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On Tuesday, February 13, 1996 3:00:00 AM UTC-5, James W. Lynch wrote:
> Does anyone have plans for a simple off-hook detector?  I need to know
> when someone has lifted a receiver.  A dial-tone detector circuit would
> also work.  

> Any suggestions?

> Thanks,
> Jim.

Did all Telephone exchange Inc. companie have that off hook tone that was a medium pitch sound that went like a horn? Was it a siren or a buzzer?

 
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