Push-button dial circuit

Details Push-button dial circuit Push-button dial circuit

1980-09-12

1983-01-04

Popek, Joseph A.

179 84VF, H04M 100

Patent

active

043673759

ABSTRACT:
A push-button dial circuit having a low DC resistance and a high output impedance. An oscillator for generating a multi-tone dial signal is connected through a buffer transistor to terminals for coupling the multi-tone dial signal to a subscriber's line. The terminals also supply a DC power source current to the dial circuit. A constant voltage circuit is connected to the oscillator to stabilize the DC current supplied to the oscillator, and a reactance transistor circuit is connected between the terminals and the oscillator for defining a DC supply path from the terminals through the reactance transistor circuit to the oscillator. The reactance transistor circuit includes a transistor having a capacitor and a resistor respectfully connected across the base-emitter path and across the base-collector path of the transistor.

REFERENCES:
patent: 3916114 (1975-10-01), Persson
patent: 3989902 (1976-11-01), Cowpland

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