Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1977-01-21
1978-04-11
Robinson, Thomas A.
Telegraphy
Systems
Line-clearing and circuit maintenance
307294, H03K 1726, H04L 2502
Patent
active
040840700
ABSTRACT:
A circuit for protecting a TELEX line driver from damage due to overcurrent caused by a short circuit on the communications line. Two transistors are connected to form a monostable circuit having an input coupled across a resistor in the current path of the line driver. When current in the line driver exceeds a safe threshold value, the monostable circuit is triggered into a relatively long timed state during which the output of the monostable circuit inhibits conduction in the line driver. When the monostable circuit returns to its stable state, the line driver conducts for a short time until the monostable circuit is again triggered. Conduction in the line driver has a protective low duty cycle until the short circuit is removed and normal operation is automatically resumed.
REFERENCES:
patent: 3317668 (1967-05-01), Johnsen
patent: 3887824 (1975-06-01), Blauert et al.
Khalifeh Jacob Richard
Reed Lamar Nelson
Christoffersen H.
Cohen Samuel
Olson Carl V.
RCA Corporation
Robinson Thomas A.
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