TRAIN APPROACHING ANNUNCIATOR Russian patent published in 1997 - IPC

Abstract RU 2071429 C1

FIELD: railway transport; signalling devices. SUBSTANCE: device has train approach piezoelectric sensor, low frequency differential amplifier, amplitude detector with RC-circuit at output, time delay circuit, inverter, multivibrator, audio frequency amplifier and sound and light signalling devices. EFFECT: improved reliability, provision of safety. 2 dwg

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RU 2 071 429 C1

Authors

Grachev V.Ju.

Araten S.M.

Zadorozhnyj L.I.

Ignat'Ev A.P.

Ljalin A.I.

Sharadze O.Kh.

Dates

1997-01-10—Published

1993-07-13—Filed