Calling circuit

Details Calling circuit Calling circuit

H - Electricity

04

M

379/12, 379/33,

H04M 3/02 (2006.01) H04M 1/72 (2006.01) H04M 3/42 (2006.01)

Patent

CA 1088683

ABSTRACT The diclosure is directed to a calling circuit which controls the connection of two different audio signal sources to a single audio signal transmission path for broadcasting the audio signals over a telephone set loudspeaker as well as controlling the illumination of indicators in the telephone set and at the main control circuit. Only four conductors are used to connect the telephone set with the main control circuit, two of which are power supply conductors which may supply other circuits as well.

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