Line matching circuit for use in a tone pushbutton dialling subs

Details Line matching circuit for use in a tone pushbutton dialling subs Line matching circuit for use in a tone pushbutton dialling subs

1974-05-22

1976-09-21

Claffy, Kathleen H.

179 84R, H04M 150, H04M 100

Patent

active

039820785

ABSTRACT:
An impedance matching circuit for a pushbutton telephone uses two voltage regulating transistors having their emitter-collector terminals connected in parallel with a potentiometer, the output terminals of the telephone set, and the output of a pushbutton tone generator amplifier. The base terminal of one of the transistors is connected directly to a tap of the potentiometer, while the base of the second transistor is connected to a further tap on the potentiometer through a low pass filter.

REFERENCES:
patent: 3731004 (1973-05-01), Coupland
patent: 3823272 (1974-07-01), Tabalba

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