Controller for video tape recorder

Details Controller for video tape recorder Controller for video tape recorder

1977-03-28

1978-06-20

Salce, Patrick R.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307141, 325396, 358190, H02H 312, H04N 700

Patent

active

040965422

ABSTRACT:
A controller for initiating operation of a video tape recorder and for terminating operation when its power consumption drops to a predetermined level utilizes a power transfer circuit for coupling the recorder to a source of energizing potential. A normally open switch, included in the transfer circuit, responds to an actuating signal developed by an operational amplifier, which amplifier is activated by an enabling signal from a preset clock. Thereafter, the amplifier is controlled by a derived signal having an amplitude proportional to the current drawn by the recorder. When the energizing current for the recorder drops below a predetermined level, the derived control signal is now of insufficient amplitude to maintain the amplifier in an operating condition, as a result, the actuating signal for switch is interrupted and operation of the recorder is terminated.

REFERENCES:
patent: 3593148 (1971-07-01), Cummings
patent: 3962532 (1976-06-01), Aubert et al.

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