A 50W/Channel Composite Amplifier

In this often mentioned project published in audioXpress, April 2001, the author explores the advantages of composite amplifiers and provides a detailed description on how he built his 50W per channel unit. A composite amplifier (also called nested-feedback amplifiers) consists of two or more operational amplifiers cascaded together with a negative-feedback loop around the entire network. Read the complete article now available online.

Linear Audio Volume 11 is now available and includes excellent tutorials by Gary Galo, Hans Polak, Giovanni Stochino, Michael Kiwanuka, Guido Tent and Burkhard Vogel; articles on Circuit Design by Dimitri Danyuk and Douglas Self; articles on Room Acoustics by Hannes Allmaier and Bill Waslo, book reviews, and much more.

Linear Audio 9 is the tenth volume in a series of bookzines dedicated to audio technology and perception. Linear Audio offers a variety of articles written by an international team of authors and accredited academics on a plethora of engaging subjects, from tutorials to circuit and system design, test reports and book reviews.

Focal Press released the 2nd edition of Douglas Self’ Small Signal Audio Design originally published in 2010 and a valuable resource on audio circuitry, components and dealing with audio electronics. The second edition is expanded with ADCs and DACs, microcontrollers, more coverage of discrete op amp design, and a completely new chapter on headphone amplifiers.