>
> There is an X10 device called a TW23 power line interface (about $25) that
> will give you access to the zero crossing for sending & receiving. I
> recently saw a circuit using a opto isolator to pick-off the zero crossing;
> this signal then could be used to gate your trans/ rec. The tw23 is a much
> better bet.
> Good luck
>
> Wil Reeder
> spam_OUTteachtechspam_OUTbc.sympatico.ca
>
> ----------
> > From: Malcolm N. Haynes Jr. <STOPspammalcolmCEW.WWIA.NET>
> > To: spamBeGonePICLISTspamMITVMA.MIT.EDU
> > Subject: Power Line Interface
> > Date: Wednesday, September 30, 1998 6:10 AM
> >
> > My name Is Malcolm and I am working on a home automation project.
> Currently I am building a transmitter to place X10 signals onto the 120VAC
> 60Hz house mains. The signal transmitted is a +5V/120kHz square wave. The
> timing is on the zero crossings of the AC line. I need to block the 60Hz
> signal from the output while allowing it to pass for the zero crossing and
> power supply do you have any ideas.
> >
> > Thanks in advance for your help.
> >
> > Malcolm