Telephone set ringing current injection device

Details Telephone set ringing current injection device Telephone set ringing current injection device

1979-09-14

1981-12-15

Konick, Bernard

179 18HB, H04M 302

Patent

active

043061184

ABSTRACT:
A telephone set line circuit ringing current injection device having a hybrid circuit in which each feed wire is connected in series with a resistor, and a stage consisting of a diode connected in parallel with the collector-to-emitter circuit of a transistor. The cathode of one diode is connected to the collector of the transistor on the side of one of the feed wires, the anode of the other diode and the emitter of the other transistor are connected to the other wire.

REFERENCES:
patent: 3829619 (1974-08-01), Close et al.
patent: 3917909 (1975-11-01), Macrander et al.
patent: 4001516 (1977-01-01), Weisigk et al.

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