Abstract: A delayed response air conditioning/heating control system provides a detector which responds to a door or window left open, after a predetermined period of time, and which automatically resets to start time (maximum) if the door or window is closed prior to time of response; otherwise it disables the air conditioning heating system. The system has a wired, or anternatively a wireless, sensor with built-in delay and reset, and a receiver or detector with latching relay and manual relay reset control. If the air conditioning/heating system was operating at the time of disablement, a flashing light indicates this.

Abstract: A broad band wave detection system which responds to no signal versus any signal with a resettable indicator which responds only after a pre-determined period of time. The system has a crystal detector coupled to a chopper, an AC amplifier, a detector which is coupled to a level detector and a time delay to actuate an indicator driver to produce a visual or aural signal. The system indicates the presence of an RF signal which has remained constant for a pre-set period of time and re-sets to zero time on removal of the RF signal.