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Convention Paper

Soft Magnetic Materials for Audio Transformers: History, Production and Applications

Authors: Sowter, G. A. V.

AES Convention 82 · Paper 2467 · March 1987

Abstract

The Author traces the history of soft, magnetic materials from 1000 B.C. to the present time. He describes the work of Oersted and Faraday who invented the first transformer, and the gradual improvements in core material over the last 150 years. These cover soft iron, silicon iron, grain orientation, Hi-B steels and domain control by lasers and spark ablation. Amorphous metallic glasses are also detailed. Having spent a lifetime on nickel iron alloys, particularly Mumetal, he discusses design and characteristics of a wide range of audio transformers and magnetic shields.

Details

Published in
AES Convention 82
AES Convention
82
Paper number
2467
Publication date
March 6, 1987
Session subject
Circuit Techniques
Affiliation
Consultant to Sowter Audio Transformers, Ipswich, England (See document for exact affiliation information.)
Type
Convention Paper