| 摘要 |
<p>PURPOSE:To select easily a desired channel by one touch by providing plural channel selection switches for specifying channels to be selected and plural output terminals corresponding to those channel selection switches. CONSTITUTION:A channel selecting circuit part 11 consists of the channel selection switches S1-S8 corresponding to the 1st - the 8th channels (Ch) and an output holding circuit 14 which generates an H (high)-level output at one of output terminals O1-O8 corresponding to a channel selection switch which is turned on. When the 8th channel selection switch S8 of the channel selecting circuit part 11 is depressed to select the 8th channel, the output holding circuit 14 sends out the ''H''-level output from the output terminal O8 correspondingly. A movable terminal (a) and a fixed terminal b4 are connected together to connect a power source +B to the light emitting diode D8 for the 8th channel display, and the light emitting diode D8 turns on to indicate that the 8th channel is selected.</p> |
