Light emitting diode message waiting lamp circuit

Details Light emitting diode message waiting lamp circuit Light emitting diode message waiting lamp circuit

1985-12-16

1987-03-03

Rubinson, Gene Z.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379385, 379396, H04M 100

Patent

active

046481095

ABSTRACT:
A circuit providing a message waiting indication using a light emitting diode and a constant current surge protected circuit for use with PABX extension telephone instruments. Recently developed light emitting diodes operated with current of one milliampere or less are effectively used in the present circuitry which limits current to the device in the operating mode and also as low leakage current while in the "off" mode.

REFERENCES:
patent: 3748403 (1973-07-01), Schartmann et al.
patent: 4440981 (1984-04-01), Grantland et al.
patent: 4529843 (1985-07-01), Boeckmann

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