ELECTRONIC VOLUME AND ON/OFF CIRCUITS FOR REMOTE CONTROL SYSTEMS

摘要

A remotely operable all electronic volume and on/off control circuit for a signal receiver having a sound channel responsive to variations in an alterable impedance includes an insulated-gate FET-type (IGFET) semiconductor and adjustable impedance series connected intermediate the sound channel and a potential reference level, an on-off relay coupled to the adjustable impedance for effecting energization of the signal receiver, a memory means coupled to the semiconductor, and a single relay up-down volume control means coupled to the memory means and responsive to signals at two different frequencies for effecting increased and decreased audio volume from the sound channel and for effecting operation and discontinuance of operation of the signal receiver.