Coming Soon: X-Altra RIAA Phono EQ Preamp
The ‘X-Altra Phono EQ Preamp’ is an accurate, very low noise high performance unit that will accept moving coil and moving magnet inputs. A low noise mains power supply (3.5 Watts) is integrated into the unit, which is housed in…
Ground Loops
Updated with new material 7th January 2019 This set of c. 50 slides is the culmination of my experience over a period of about 25 years building numerous power amplifiers and preamplifiers. I first started out in audio around 1975…
Noise in Electronic Circuits
I’ve gathered a few articles here on noise as a go-to reference for anyone interested in the subject. These articles really focus on Johnson noise and not induced noise which is discussed in depth in the ‘Ground Loops’ post elsewhere…
Ovation 250 Power Amplifier
The Ovation 250: A 250W per Channel Audio Power Amplifer (updated 1st June 2013) This amplifier was built in 2005/2006 and this write-up originally published in 2009. Introduction Diy Audio is a wonderful activity:- if you cannot afford a $10 000 power…
The Monolithic Op-Amp: A Tutorial Study
This was an invited paper at the ISSCC in 1974 by James Solomon, who at the time worked for National Semiconductor (acquired in 2011 by TI). Those were heady days in semiconductors, with major process and circuit design breakthroughs taking…
