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From: ditz@ECN.PURDUE.EDU (Michael R Ditz)
Newsgroups: sci.electronics
Subject: Zero-crossing help
Message-ID: <9102182138.AA22294@en.ecn.purdue.edu>
Date: 18 Feb 91 21:38:41 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 14


I am working on an X-10 based home control system for a senior
project.  We have decided to make our own X-10 transmitter for
specific reasons.  The part that I am having trouble with is the
zero-cross detector.  What we need is the AC line as input, and 
some "nice" voltage output pulse at each zero-cross.  One of
the problems is that a transformer CANNOT be used, because it
will shift the phase.  I would GREATLY appreciate any help on 
how to do this.


Thanx!!!

   Mike  (ditz@en.ecn.purdue.edu)