Abstract: Smoke detector apparatus characterized in the utilization of solid state components in conjunction with standard primary batteries as a power source. Operating under photo-optical principles, the apparatus incorporates a solid state detector which, while having a low current drain characteristic, exhibits dark current phenomena. A stabilization network is provided to accommodate for this phenomena which includes an amplifier having a transistor stage and means for clamping that stage in a partially forwardly biased state. Detection of smoke causes the amplifier to generate a signal output as a step function.

Abstract: An intrusion alarm system incorporating an inertially responsive sensor arrangement which, in one embodiment, is provided as a body of mass suspended in pendulum fashion within a compact housing. A permanent bar magnet suspended therewith operates in conjunction with a manetically actuable switch to provide highly responsive and reliable sensing. A logic circuit provides a responsive, efficient pulsating alarm at dual frequencies optimized for human recognition, and a wireless magnetic remote disarm feature is provided.