Hi, I have designed and built my own X10 receivers without needing the 523
interface. They use standard discrete components for interfacing with the
mains.

My units plug directly into the mains, and need no code switches for
house/unit definition; they store this in the EEPROM. They also have some
more features over the original modules.

Also, they are based on the 16F84 / 16F628, chips which are more readily
available and are current.

Do you have a business proposition in mind?

Do write back if you are interested.

Regards,

Anand.

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