FIELD: electrical engineering; isolating transformers; feeding digital hardware highly responsive to noise. SUBSTANCE: transformer has shielding case 7 accommodating magnetic core 3 whose leg carries primary winding 2 and secondary winding 4 separated by three-dimensional screen 6 made of high-resistivity isotropic material. Screen 6 may be made in the form of cylinder or built up of several parts. EFFECT: improved noise immunity of transformer. 9 cl, 4 dwg
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