A system transmits and receives control signals for various types of indoor devices using the existing power wiring in houses and buildings. The transmitter section of the power wiring transmission system is provided with a circuit in which the output of a sine wave oscillator is fed to an emitter-follower...http://www.google.fr/patents/US4517548?utm_source=gb-gplus-shareBrevet US4517548 - Transmitter/receiver circuit for signal transmission over power wiring
Transmitter/receiver circuit for signal transmission over power wiring
