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'Power Line Interface'
1998\09\30@141839 by Malcolm N. Haynes Jr.

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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

1998\09\30@160534 by Kenneth Lumia

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Malcolm,

You may want to look at http://www.x10.com/products/x10_tw523.htm

The TW523 module connects to the wall - all you need to do is
provide
the data with the correct timing (TX and RX).  This device frees
you from
having to deal with the AC line (hazardous).  Somewhere on that
page there is
link to a PDF file that describes the device in detail, including
timing, etc.
As I recall, there may have also been a schematic.

Ken


{Original Message removed}

1998\09\30@173456 by Kevin McCusker

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Try http://www.hth.com.  They have a 2400 baud power line modem in kit form for about $
36US

Malcolm N. Haynes Jr. wrote:

> 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 c
rossings of the AC line. I need to block the 60Hz signal from the output while a
llowing it to pass for the zero crossing and power supply do you have any ideas.
>
> Thanks in advance for your help.
>
> Malcolm


'Power Line Interface'
1998\10\01@124044 by WIL REEDER
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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_OUTteachtechTakeThisOuTspambc.sympatico.ca

----------
> From: Malcolm N. Haynes Jr. <.....malcolmKILLspamspam@spam@CEW.WWIA.NET>
> To: PICLISTspamKILLspamMITVMA.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

1998\10\01@131552 by Philip Restuccia

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Not intending to nitpick, but for anyone interested in this device and
that will
be doing a Web search to locate it, the correct model number is TW523,
not TW23.
There is also a PL513 receive-only device.  Both are made by X-10 USA.
You can
get more info about the TW523 at http://www.smarthome.com/1135.html to
start.

       Philip Restuccia
       .....philip.restucciaKILLspamspam.....peri.com


WIL REEDER wrote:
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