Arrangement for applying signals to a telephone line

Details Arrangement for applying signals to a telephone line Arrangement for applying signals to a telephone line

H - Electricity

04

M

379/67

H04M 7/00 (2006.01) H04M 19/00 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1143494

25.1.1980 1 PHN 9466 "ABSTRACT". Arrangement for applying signals to a telephone line. Arrangement for applying signals to a two- wire telephone line, comprising two line control circuits each comprising a fed-back amplifier circuit. According to the invention the amplifier circuits are constructed from an input stage constituted by an operational ampli- fier, a transistor arranged as a voltage amplifier (inter- mediate stage), and a power output stage which is in the form of a push pull amplifier. The line control circuits can either receive the control signals with an opposite polarity or they can both receive the same control signal, one line control circuit being used as an inverting and the other as a non-inverting amplifier.

352542

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