Circuit for use in a telephone set

Details Circuit for use in a telephone set Circuit for use in a telephone set

H - Electricity

04

M

379/30

H04M 1/26 (2006.01) H04M 1/31 (2006.01)

Patent

CA 1163387

-9- PHN9692 ABSTRACT A circuit comprising a line interruption arrange- ment for producing dial pulses, comprising a series arrangement of a semiconductor switching element and a control device connected between a first and a second line terminal, the first and second terminals being provide to enable connection to subscriber's line. To limit the current in the subscriber's line while using a minimum of components, the control circuit comprises a current detec- tion device which is connected to the control electrode of the semiconductor switching element to drive the semicon- ductor switching element into saturation when the line current is below a predetermined value and to drive the semiconductor switching element out of saturation when the line current is above the said predetermined value.

371237

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