Class A Buffering the Correct Way

Here’s a simple way to force an opamp output stage to run in class A when used with a discrete buffer output stage – it takes just 1 resistor to provide a near constant current source load. Operating the opamp (and the output buffer stage) in class A dramatically reduces harmonics on the power rail […]

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Disc Recording Equalization Demystified by Gary A. Gallo

Pictured: A Neumann Cutting Lathe used to make the record master. Picture courtesy of Bakery Mastering This is one of the best non-mathematical introductions to the RIAA disc recording playback chain written. Gallo worked at the Crane School of Music in New York for 30 years as an audio engineer, where he also received a […]

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CFA vs. VFA: A Short Primer For the Uninitiated

This article was written in 2014 in response to what can only be described as a vitriolic debate as to what constituted a CFA on diyAudio.com.  At the time, many of the participants were struggling to grasp the fundamental differences between VFA’s and CFA’s, and even how to tell them apart.  So, this document is […]

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Audio Power Amplifier Design – Peter J Baxandall

In this 6 part series of articles published from January 1978 in the now defunct Wireless World magazine, Peter Baxandall takes the reader through some of the fundamentals of audio amplifier design as they were understood at the time.   Baxandall_Audio Power Amplifier Design In 1978  there was still much discussion about feedback and how […]

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The Theory of TIM – Matti Otala

Matti Otala  follows up on earlier research on the subject of TIM. The Theory of TIM Matti Otala

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Review of Bob Cordell’s Book ‘Designing Audio Power Amplifiers’

‘Designing Audio Power Amplifiers’ by Bob Cordell  – Reviewed by Andrew C. Russell in 2011 Bob Cordell (on the right) pictured with Jan Didden, publisher of ‘Linear Audio’ After a 25 year hiatus from electronics, I returned about 6 years ago (i.e. 2005) to linear design not as a professional but as a hobbyist. Earlier […]

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