Control device

H - Electricity – 03 – J

Patent

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342/10, 365/12

H03J 5/02 (2006.01) H03H 5/12 (2006.01) H03K 17/96 (2006.01) H04N 5/44 (2006.01)

Patent

CA 1057433

ABSTRACT OF TEE DISCLOSURE A channel selector for use with a tuner of the type using a VARICAP ? diode as a channel selecting element which includes a plurality of preset potentiometers-for supplying different direct current voltages to the VARICAP ? diode, a clock pulse generator, a switching device for supplying to the VARICAP ? diode the different voltages taken out of the plurality of preset potentiometers by-switching these preset potentiometers in turn whenever an output pulse from the clock pulse generator is supplied to the switching device, and a plurality of switches. The logic sum of the outputs of the switches is applied as one input to a NAND gate. The logic products of the outputs of the switches and their associated outputs of the stepping switching device are applied as inputs to a NOR gate. The output of the NOR gate is applied as the other input to the NAND gate. The clock pulse generator is controlled in response to the NAND gate.

196151

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