The schematics for both the TW523 and PL513 are in the <A HREF="ftp://ftp.x10.com/pub/manuals/technicalnote.pdf">technicalnote.pdf</A> available on the X-10 website.
Are you trying to build your own PIC-based X-10 interface to the power line? If so, there are some people here who have done that who might be willing to share if you can provide details such as power line voltage and frequency.
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