Method for RIAA correction of audio signal with use of transformer

A method of RIAA correction of audio signals comprising using in a RIAA-correcting pre-amplifier a transformer having a primary winding and two or more secondary windings, with two of the secondary windings playing essential role in RIAA-correction, wherein a core of the transformer is a shielded-type core made from magnetic plates, with the primary winding wound on a central part of the core, and at least one of the secondary windings which take part in RIAA correction being made in one or more sections, wherein each of the sections being placed on a side part of the core.

A method of RIAA correction of audio signal comprising using in a RIAA-correcting pre-amplifier a transformer having a primary winding and two or more secondary windings, with two of the secondary windings playing essential role in RIAA-correction, wherein a magnetic induction under the action of a constant magnetizing current in one of the windings has equal values at all parts of the core, neglecting non-uniformity of the induction in the cross section plane and losses of magnetic induction along the core, as well as the areas where the core exhibits a bend, has an air gap or constrictive holes.

A circuit for a RIAA-correcting pre-amplifier, comprising:

• a transformer having a primary winding and two or more secondary windings, with two of the secondary windings playing essential role in RIAA-correction, wherein a magnetic core of the transformer includes several separated parallel magnetic circuits.