Updated: 25 May 2010
The material in this section has been removed because it has been published, in a greatly expanded form, in a new book of mine called "Small Signal Audio Design" which is available now.
It looks like this.
An excerpt from the blurb on the back:
"You will learn how to make amplifiers with apparently impossibly low noise, how to design discrete circuitry that can handle enormous signals with vanishingly low distortion, how to use humble low-gain transistors to make an amplifier with an input impedance of more than 50 Megohms, how to transform the performance of low-cost-opamps, how to make filters with very low noise and distortion, how to make incredibly accurate volume controls, how to make a huge variety of audio equalisers, how to make magnetic cartridge preamplifiers that have noise so low it is limited by basic physics, and generally how to sum, switch, clip, compress, and route audio signals. Finally, a chapter on power-supplies, full of practical ways to keep both the ripple and the cost down, shows how to power everything."
And I can verify that is all in there.
It is therefore desirable to free up some space on the site for other new material, such as the recently added "More on two-transistor RIAA stages"
There is more stuff currently under development. I'm sorry for any inconvenience caused, but it will be a good thing in the long run. Really.