Electronic relay arrangement

Details Electronic relay arrangement Electronic relay arrangement

1979-09-26

1981-11-10

Robinson, Thomas A.

Telegraphy

Repeaters

Using transistors

H04M 126, H04L 2520

Patent

active

043000185

ABSTRACT:
An electronic relay arrangement that is suitable for use as a repeater in systems for single-current as well as double-current telegraphy comprising an input circuit, an output circuit and a transmission circuit interposed between the input and output circuits. The input circuit comprises a current switching device which responds when a threshold current value of the telegraph line current is exceeded and causes a current, having a predetermined constant value, to flow through the transmission circuit. The electrical isolation between the input and output circuits can be effected by, for example, a light-emitting diode in the transmission circuit and a photo-transistor.

REFERENCES:
patent: 3867567 (1975-02-01), Herron et al.
patent: 4000364 (1976-12-01), Silverstein
patent: 4004091 (1977-01-01), Marley et al.

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