INDIVIDUAL VOLTAGE ALARM Russian patent published in 1998 - IPC

FIELD: electrical engineering. SUBSTANCE: voltage alarm has antenna connected to self-control circuit connected in its turn to power supply source through automatic on-off device, as well to first and second channels. First channel consists of series-connected amplifier, detector and pulse generator. Second channel has series-connected follower, filter, amplifier, detector, and pulse generator. Automatic on-off device is also connected to input of second channel amplifier. Pulse generator outputs of both channels are connected through OR gate to tone generator the output of which is connected to piezoradiator which generates audio signal at frequency of pulse generator of first or second channel. EFFECT: more effective construction. 4 cl, 4 dwg