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From: has@ukc.UUCP
Newsgroups: sci.electronics
Subject: Re: Question about multi-switched lights
Message-ID: <2807@eagle.ukc.ac.uk>
Date: Sat, 28-Mar-87 06:01:17 EST
Article-I.D.: eagle.2807
Posted: Sat Mar 28 06:01:17 1987
Date-Received: Mon, 30-Mar-87 03:19:42 EST
References: <1922@ihlpl.ATT.COM> <562@puff.WISC.EDU> <3972@fritz.UUCP> <18002@ucbvax.BERKELEY.EDU> <18008@ucbvax.BERKELEY.EDU>
Reply-To: has@ukc.ukc.ac.uk (H.A.Shaw)
Organization: U of Kent at Canterbury, Canterbury, UK
Lines: 29


The easist way to do this is as follows:

-------+
       |------------------------------------------------------------------+
       |                                                                  |
 POWER |                    C           D                                 |
       |       *------------*           *------------*         +-------+  |
       |----*===                                     ===*------| LIGHT |--+
-------+       *------------*           *------------*         +-------+
                            A           B
	   switch 1            switch 2            switch 3

Switch 2 is a double pole, double throw reversing switch.  The contacts are
arranged as follows:

Contacts ( A-->B and C-->D ) or ( A-->D and C-->B )

Switching any switch will reverse the state of the light.  This can be extended
as far as is neccessary.
						HOWiE.

						Howard Shaw,
						Physics Lab.,
						University of Kent,
						Canterbury.
						England.

						has!ukc