Television shut-off device

Details Television shut-off device Television shut-off device

1971-10-21

1976-08-17

Safourek, Benedict V.

325393, H04B 116

Patent

active

039756882

ABSTRACT:
An automatic shut-off device for television sets or equivalent apparatus receiving electromagnetic signals and transforming the same into audio or video signals. A shut-off device includes a detecting circuit which responds to the presence of a video or audio signal on the apparatus to be controlled permitting the set up of a switching circuit in the form of a silicon controlled rectifier energizing a relay in the power circuit of the apparatus or television set. The automatic device includes a time delayed portion simultaneously energized with the detecting portion to provide a timing function through unijunction transistor to control the firing of the silicon controlled rectifier in the operation of the relay.

REFERENCES:
patent: 3378775 (1968-04-01), Joseph
patent: 3541453 (1970-11-01), Vanderpoel et al.
patent: 3559072 (1971-01-01), Davisson

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