| 摘要 |
The input circuit is provided with a transformer (2) whose primary winding is connected via a capacitor (C1) to the telephone feeding line (A, B) and whose secondary winding is connected with a parallel-connected capacitor (C2) to the signal receiver. The one winding (3) of the transformer (2) with a single three-limb core (1) comprises two winding parts (4, 5) with different numbers of windings which are disposed on the outer limbs (6, 7) on either side of the central limb (8) which carries the other winding (9). The winding parts (4, 5) are wound in the same direction so that magnetic fluxes induced in the outer limbs (6, 7) move in the same direction. The winding (3) comprising two winding parts (4, 5) can be used as a primary or secondary winding. <IMAGE>
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