| 摘要 |
<p>PROBLEM TO BE SOLVED: To cut down the expense of manufacturing and reduce cost by making the device compact and lightweight as a whole, and downsizing the case, and facilitating the handling, and facilitating the manufacture. SOLUTION: A common winding 2 which has a proper number of taps 3, 4 and 5 is provided with a step-down single winding transformer 1 linked with a series winding 10, and those taps 3, 4, and 5 are connected with an i/o common terminal 16 through selection switches 6, 7, and 8, respectively. Also, a short circuit 17, free of opening and closing by other switch 12, is interposed between both ends of the common winding 2, and also outer end 11 of the series winding 10 is connected to the input terminal 14, and moreover, its inner end 9 is connected to an output terminal 15.</p> |
