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From: albert@ucbarpa.Berkeley.EDU.UUCP
Newsgroups: sci.electronics
Subject: Re: Question about multi-switched lights
Message-ID: <18008@ucbvax.BERKELEY.EDU>
Date: Wed, 25-Mar-87 18:50:23 EST
Article-I.D.: ucbvax.18008
Posted: Wed Mar 25 18:50:23 1987
Date-Received: Fri, 27-Mar-87 04:15:37 EST
References: <1922@ihlpl.ATT.COM> <562@puff.WISC.EDU> <3972@fritz.UUCP> <18002@ucbvax.BERKELEY.EDU>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: albert@ucbarpa.Berkeley.EDU.UUCP (Anthony Albert)
Organization: University of California, Berkeley
Lines: 20

Well, I thought about it some more and figured it out. It requires 2 DPDT
switches.


                                        ___
          ____ \___ _ _ _ _ _ _ _ _ _ __|  \___
         |                                     |
_________|                                     |________
         |_____                                |
	       \___ _ _ _ _ _ _ _ _ _ ____ \___|


This represents 2 DPDT switches connected by 2 wires (_ _ _). To create a
similar circuit with 3 switches, they'd have to be 4 pole. In general, a
                                               n-1
circuit with n switches requires each to have 2    poles.

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