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    • 7. 发明授权
    • Varactor tuner driver circuit
    • 变送器调谐器驱动电路
    • US3769590A
    • 1973-10-30
    • US3769590D
    • 1972-06-12
    • ZENITH RADIO CORP
    • HENDRICKSON M
    • H03J5/02H04B1/16
    • H03J5/0218H03J5/0209
    • A varactor driver circuit in a television receiver for providing a varactor tuner with unique control voltages representative of particular broadcast channels selected by the viewer. The varactor driver circuit utilizes first, second and third sets of electrically isolated conductors arranged in a matrix configuration physically defining individual broadcast channels. Each one of a first set of conductors defines a range of broadcast channels (e.g., channels 20-29) while each of the second conductors together with an associated one of the third conductors defines individual channels (e.g., channel 0, 2, 12 . . . , 82) within the defined ranges. Physically identical plug-in modules each comprising an adjustable voltage divider network, are insertable into the multiple receptacles so defined by the three sets of conductors, each receptacle identifying a unique broadcast channel. A switching arrangement selectively couples the first conductor corresponding to the range of the desired broadcast channel to the varactor tuner. The switching arrangement further couples the second conductor corresponding to the particular channel in that range to a plane of reference potential (B+) while simultaneously coupling the corresponding third conductor to ground. Accordingly, a potential is applied across the voltage divider network, and a control voltage unique to that particular broadcast channel is coupled through the first conductor to the varactor tuner.