Telephone line voltage actuated switch

Details Telephone line voltage actuated switch Telephone line voltage actuated switch

1979-02-05

1986-11-18

Richardson, Robert L.

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

H04M 164

Patent

active

046237593

ABSTRACT:
A voltage actuated switch coupled to a telephone line for actuating a tape recorder or other apparatus with a transistor in series with the apparatus and a power source; a circuit within the switch biases the transistor into conduction when the telephone line voltage is low, "off-hook" causing the tape recorder or apparatus to operate; when the telephone line voltage is high, "on-hook", the circuit biases the transistor off, current ceases to flow to the tape recorder or apparatus that is then turned off.

REFERENCES:
patent: 3524026 (1970-08-01), Langendorf et al.
patent: 3562441 (1971-02-01), Bretschneider
patent: 3728489 (1973-04-01), Beacham

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