Ring sense telephone tone ringer circuit

Details Ring sense telephone tone ringer circuit Ring sense telephone tone ringer circuit

1984-10-10

1986-07-08

Dwyer, James L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307362, 179 84R, H04M 100

Patent

active

045994943

ABSTRACT:
A sense circuit which senses when the magnitude of a full wave rectified current exceeds a predetermined threshold value comprises current mirrors for diverting a very small portion of the current to an output wherein this current is filtered to produce a direct current (dc) voltage. The magnitude of the dc voltage varies directly with the magnitude of the rectified current. The dc voltage is compared with a reference voltage to produce an output signal when the magnitude of the reference voltage is exceeded.

REFERENCES:
patent: 4292604 (1981-09-01), Embree et al.
patent: 4447675 (1984-05-01), Arntsen et al.

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