Tuners – Tuner unit with electromagnetic operator – Predetermined center frequency selector
Patent
1977-02-10
1978-04-04
Safourek, Benedict V.
Tuners
Tuner unit with electromagnetic operator
Predetermined center frequency selector
325464, 334 14, H03H 512
Patent
active
040830128
ABSTRACT:
A compact and efficient design of a function switching and indication arrangement for a TV receiver or other communications apparatus is described. The functional setting, illustratively indicative of a selected one of a plurality of TV channels, is chosen by the depression of an associated one of a plurality of keys that are respectively connected to externally accessible first switching terminals of a corresponding number of transistorized binary multivibrators that are arranged in an integrated circuit. The outputs of the multivibrators are coupled, on the integrated circuit chip, to a corresponding plurality of multi-collector transistors, one of whose outputs is used to reset the multivibrators of the non-selected channels, and another of whose outputs is employed to set the selected channel itself. A light emitting diode or other suitable visual indicator is connected in series with the key across the terminals of an energizing DC source, so that both such indicator and the key are coupled to a common access switching terminal of the associated multivibrator. The depression of the key serves simultaneously to provide a selection signal for the appropriate channel, to disable the multivibrator and indicator for each of the other channels, and to illuminate the indicator coupled to the depressed key.
REFERENCES:
patent: 3503018 (1970-03-01), Cavanagh
patent: 3652960 (1972-03-01), Sakamoto et al.
patent: 3714585 (1973-01-01), Koch
patent: 3787788 (1974-01-01), Le Fevre
patent: 3886457 (1975-05-01), Petaja
patent: 3903433 (1975-09-01), Leuschner
patent: 3996540 (1976-12-01), Yamada et al.
patent: 4031473 (1977-06-01), Mitarai
Chin Tommy P.
Loewe-Opta GmbH
Safourek Benedict V.
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