AES E-Library

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

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.

Author: Sowter, G. A. V.
Affiliation: Consultant to Sowter Audio Transformers, Ipswich, England
AES Convention:82 (March 1987) Paper Number:2467 Import into BibTeX
Subject:Circuit Techniques

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD aes11)   /pp8690/pp8703/2564.pdf

Start a discussion about this paper!