New monitors on old machines
pat at computer-refuge.org
Tue Nov 7 16:25:28 CST 2006
On Tuesday 07 November 2006 14:52, der Mouse wrote:
> >> 7) Three way switch at the other enough of the hall.
> > It's already on a three-way switch with the bottom of the stairs...
> > do they make 4-way switches?
> Yes. You need two SPDTs (which you already have) plus as many DPDTs
> as necessary to fill out the desired quota of switches (which means
> just one of them, in your case). I've seen it done (at least for
> three switches).
> You need to cross-wire the DPDT, but that's no biggie (drop me a line
> if you don't know the wiring and I'll outline it for you); I think
> there even exist DPDTs pre-cross-wired to be total no-brainers for
> this application.
Yes, in fact they're called a "4-way" switch at your local hardware or
electrical supply store (because they have 4 terminals).
There's some explanation complete with ASCII art diagrams here:
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
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