Control about any device using the remote control from just about any TV set. The circuit switches an on-board SPDT relay; turn it on with the remote; and turn it off with another signal. The relay contacts are rated one amp at 125 volts AC. The circuit operates on any DC supply from 8 to 15 volts; use an old calculator supply etc.. This circuit can have some very practical applications; such as turning on a light by an invalid. Your imagination is the limit.