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From: albert@ucbarpa.Berkeley.EDU.UUCP
Newsgroups: sci.electronics
Subject: Question about multi-switched lights
Message-ID: <18002@ucbvax.BERKELEY.EDU>
Date: Wed, 25-Mar-87 06:21:51 EST
Article-I.D.: ucbvax.18002
Posted: Wed Mar 25 06:21:51 1987
Date-Received: Fri, 27-Mar-87 00:43:52 EST
References: <1922@ihlpl.ATT.COM> <562@puff.WISC.EDU> <3972@fritz.UUCP>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: albert@ucbarpa.Berkeley.EDU.UUCP (Anthony Albert)
Organization: University of California, Berkeley
Lines: 12

I want to put switches on a phone line so that an extension phone in the
basement can be turned on and off at its location in the basement and also
upstairs. I realized that this is the same type of circuit which is used
to turn on stairway lights from the top and bottom of the stairs.  This must
be a fairly simple circuit, but I can't figure out how it's done (without
taking it apart anyway).

Can the same design be used to let 3 or more switches turn a light on or off?

				Anthony Albert
				..!ucbvax!ucbarpa!albert
				albert@ucbarpa.Berkeley.EDU