Telephone line voltage actuated switches

Details Telephone line voltage actuated switches Telephone line voltage actuated switches

1973-09-26

1977-04-12

Cardillo, Jr., Raymond F.

179 6R, 179 81R, H04M 100, H04M 1100

Patent

active

040176860

ABSTRACT:
High (resting) telephone line voltage added to a bias voltage biases a semiconductor to cut-off; low (talking) voltage added to the bias voltage biases the semiconductor into conduction to actuate associated apparatus, such as a tape recorder, either directly or by actuating a second semiconductor.

REFERENCES:
patent: 2228673 (1941-01-01), Reeves
patent: 3146310 (1964-08-01), Jeffries et al.
patent: 3567867 (1971-03-01), Rice et al.
patent: 3818141 (1974-06-01), Jacobson

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