Matt's Big Class A

Single-ended Class A Audio Amplifier

This is from my archived web pages. "Matt's Big Class A" was published in the September 2003 issue of AudioXpress magazine.

Schematic, parts placement, more pictures, and a descriptive article long enough for bedtime reading. The article describes the amplifier and its design. All the Figures and Photos mentioned in the article are listed at the bottom of this page. The Photos can be enlarged by clicking on them.


The amplifier was my senior project at San Diego State University (SDSU) for the fall 1999 semester. The design uses a differential input stage, gain stage, and single ended class A output (plus two buffer stages). I wanted to build an amplifier that was low in distortion and used a class A output stage. I think the biggest difference in sound from an amplifier comes from the amplifier topology. Many more pictures are below.