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A transformer includes a magnetic core through which an insulated electrical first conductor extends to define a turn of winding. The first conductor is tubular, in that it defines a generally axial aperture. A plurality of electrically insulated conductive windings are twisted together to form a bu

A transformer includes a magnetic core through which an insulated electrical first conductor extends to define a turn of winding. The first conductor is tubular, in that it defines a generally axial aperture. A plurality of electrically insulated conductive windings are twisted together to form a bundle, or a pair if only two. The bundle extends through the axial aperture, to define at least an additional turn of winding. The individual conductors of the bundle are stripped of insulation at locations without the aperture of the first conductor.

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1. A transformer comprising: an elongated magnetic core defining first and second apertures extending therethrough;an electrical first conductor extending through said first and second apertures, said first conductor having a tubular shape; anda twisted pair of insulated second and third conductors,

1. A transformer comprising: an elongated magnetic core defining first and second apertures extending therethrough;an electrical first conductor extending through said first and second apertures, said first conductor having a tubular shape; anda twisted pair of insulated second and third conductors, said twisted pair extending through said first conductor;wherein the elongated magnetic core substantially envelops the electrical first conductor and the twisted pair of insulated second and third conductors, thereby reducing transformer leakage flux; andwherein said first conductor is electrically insulated from said magnetic core. 2. A transformer comprising: an elongated magnetic core defining first and second apertures extending therethrough, said first aperture defining first and second ends, and said second aperture defining first and second ends;an electrical first conductor defining an axis of elongation and also defining first and second ends, said first conductor extending through said first and second apertures in such a manner that said first end of said first conductor lies adjacent to said second end of said first conductor, said first conductor having a generally tubular shape defining an opening extending generally parallel with said axis of elongation from said first to said second end of said first conductor;a twisted pair, longer than the length of said first conductor, of first and second insulated conductors, said twisted pair extending at least from said first end to said second end of said opening of said first conductor, each end of said first and second insulated conductors being without insulation at a location without said opening of said first conductor; anda layer of insulation surrounding said first conductor at least in those regions in which said first conductor extends through said first and second apertures;wherein the elongated magnetic core substantially envelops the electrical first conductor and the twisted pair of insulated second and third conductors, thereby reducing transformer leakage flux. 3. A transformer according to claim 2, wherein said apertures extending through said core are mutually parallel, and wherein each of said first and second apertures defines first and second ends, said first ends of said first and second apertures being mutually adjacent, and said second ends of said first and second apertures being mutually adjacent. 4. A transformer according to claim 2, wherein said core defines mutually parallel first and second planes, with said first apertures being defined in said first plane and said second apertures being defined in said second plane. 5. A transformer according to claim 2, wherein said first and second ends of said first conductor are physically and electrically connected to connection leads. 6. A transformer according to claim 5, wherein said first conductor is a braided conductor, and said connection leads at said first and second ends of said first conductor are extensions of said braid of said braided conductor. 7. A transformer according to claim 5, wherein said first conductor is a braided conductor, and said connection leads at said first and second ends of said first conductor are pigtail connections. 8. A transformer comprising: an elongated magnetic core defining first and second apertures extending therethrough, said first aperture defining first and second ends, and said second aperture defining first and second ends;an electrical first conductor defining an axis of elongation and also defining first and second ends, said first conductor extending into said first end of said first aperture and exiting from said second end of said first aperture, and from said second end of said first aperture entering said second end of said second aperture and exiting from said first end of said second aperture, said first conductor having a generally tubular shape defining an opening extending generally parallel with said axis of elongation from said first to said second end of said first conductor;a twisted pair, longer than the length of said first conductor, of first and second insulated conductors, said twisted pair extending at least from said first end to said second end of said opening of said first conductor, each end of said first and second insulated conductors being without insulation at a location without said first conductor; anda layer of electrical insulation extending over the exterior of said first conductor over at least a portion of its length;wherein the elongated magnetic core substantially envelops the electrical first conductor and the twisted pair of insulated second and third conductors, thereby reducing transformer leakage flux.