RECEIVER OF EMERGENCY ALARM Russian patent published in 1997 - IPC

FIELD: individual acoustic calling facilities with electromagnetic transmission for ascertainment of fact of unauthorized penetration into room or car. SUBSTANCE: in proposed receiver of emergency alarm filter is manufactured in the form of low-frequency filter, volumetric structural elements are mounted on first mounting plate on its internal side and on second plate - on both sides. Volumetric structural elements of first plate are arranged in gaps between structural elements mounted on internal side of second mounting plate. First inductance coil is stripline one. Longitudinal axes of three inductance coils are arranged mutually orthogonally. Longitudinal axis of cylindrical case of by-pass electrolytic capacitor is parallel to plane of mounting plates. Ratio of value of gap between cylindrical case and plane of second mounting plate to distance between plates should not exceed 0.6. Loudspeaker is positioned on external surface of second mounting plate. EFFECT: reduced dimensions and parasitic electromagnetic noises. 2 cl, 3 dwg