Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!sco!deanr
From: deanr@sco.COM (Dean Reece)
Newsgroups: sci.electronics
Subject: Re: Wanted: Phone-in-use Indicator
Message-ID: <4174@scolex.sco.COM>
Date: 19 Dec 89 21:06:45 GMT
References: <6375@nigel.udel.EDU> <1989Dec18.101522.20175@santra.uucp>
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Reply-To: deanr@sco.COM (Dean Reece)
Organization: The Santa Cruz Operation, Inc.
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In sci.electronics neumann@udel.edu (Brian R. Neumann) writes:
>
>Does anyone know of any simple circuit I could build or of any device
>that I could by to show when the phone is in use?

Sure, I built one into my phone, and it works great.  The schematic is
available on page 668 of "The GIANT Handbook pf Electronic Circuits"
published by TAB books, ISBN= 0-8306-9673-3 in hardback, or ...-9662-8
in paperback

It needs a 6 volt (or 5 volt) external supply.
 ______________________________________________________________________
| Dean Reece     Member Technical Staff |"The flames are all long gone |
| The Santa Cruz Operation 408/458-1422 | but the pain lingers on"     |
|___________deanr@sco.com_______________|___________________Pink_Floyd_|