A clear plastic box with a receiver for one power outlet

This was made to control outside Christmas lighting. A clear box contains the receiver and a relay driver transister.
This controls a power relay in a NEMA box. This box also contains a power transformer for the receiver and the relay.
An additionl two devices may be controlled via a 3mm audio jack.

Here is a photograph of the two units:

Here is the receiver circuit diagram:

Here is the Outlet Box circuit diagram:

Here is the program code.