Circuit arrangement for a tone pushbutton selection telephone su

Details Circuit arrangement for a tone pushbutton selection telephone su Circuit arrangement for a tone pushbutton selection telephone su

1975-02-11

1976-08-31

Claffy, Kathleen H.

179 81R, H04M 150

Patent

active

039782956

ABSTRACT:
A circuit arrangement for a tone push-button selection telephone subscriber set, in which a tone signal generator and a microphone amplifier are coupled to direct current networks, each of which is coupled to an output network such that two current mirror circuits having the same current ratio factor are obtained. The direct currents in the networks are exclusively switched by means of a long-tailed pair, so that the direct current flowing in the output network has a constant value.

REFERENCES:
patent: 3424870 (1969-01-01), Breeden
patent: 3454726 (1969-07-01), Gasser
patent: 3588373 (1971-06-01), Thyssens
patent: 3665489 (1972-05-01), Vollmer

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