Channel selection apparatus

Details Channel selection apparatus Channel selection apparatus

1978-05-22

1980-03-04

Griffin, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

334 15, H04B 116

Patent

active

041919246

ABSTRACT:
A channel selection apparatus comprises a counter, a decoder, a clock pulse generator, and a control circuit for controlling them, and selects a channel by switching a channel selection voltage by selecting a potentiometer. The counter includes a cascade-connected flip-flop such that a trailing edge of an AND output of an output of a flip-flop in one stage and a channel selection count input signal triggers a flip-flop in the following stage. The decoder includes a plurality of output transistors and a plurality of parallel-connected transistor sets with common collectors of each of the transistor sets being connected to a base of a corresponding output transistor and input signals being applied to bases of each of the transistor sets.

REFERENCES:
patent: 3518586 (1970-06-01), Nilssen et al.
patent: 3652960 (1972-03-01), Sakamoto et al.
patent: 3654557 (1972-04-01), Sakamoto et al.
patent: 3879747 (1975-04-01), Sakamoto
patent: 4047112 (1977-09-01), Sakamoto

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