FIELD: burglar or fire alarms. SUBSTANCE: alarm unit has voltage supply, attenuator, sensors, current regulator, driving pulse generator, binary counter, decoder, switch, analog-to-digital converter, display unit, comparison device, storage device, and keyboard. Proposed circuit arrangement provides for raising immunity to noise caused by strong electromagnetic fields or short-time contact failure at conductor (or alarm conductor) spliced joints. EFFECT: improved reliability of alarm unit. 4 cl, 2 dwg
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