Telephone line message waiting and ring indicator

Details Telephone line message waiting and ring indicator Telephone line message waiting and ring indicator

H - Electricity

04

M

H04M 3/02 (2006.01) H04M 1/82 (2006.01) H04M 3/537 (2006.01) H04M 19/04 (2006.01)

Patent

CA 2078389

A visual indicator circuit is provided for visually indicating that a telephone is ringing or that a message is waiting. The circuit includes a visual indicator such as a light emitting diode (LED), a voltage triggering circuit for triggering when a minimum predetermined voltage is applied to the telephone lines, and a current limiting circuit for limiting the current provided to the LED.

L'invention est un circuit d'indication visuelle servant à indiquer visuellement qu'un téléphone sonne ou qu'un message a été reçu. Ce circuit comprend un indicateur visuel tel qu'une diode luminescente, un circuit de déclenchement à seuil de tension qui se déclenche quand une tension minimale prédéterminée est appliquée aux lignes téléphoniques, et un circuit limiteur de courant servant à limiter le courant transmis à la diode luminescente.

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