I’m building a new preamp – this one with a microcontroller and a pile of digital hardware to provide remote control and switching. The best place for this kind of project is www.diyaudio.com – a huge set of forums for people involved in building their own equipment. I’ve been involved in the forum for almost ten years, building speakers and amplifiers.
My build thread is here: all the information about what I’m building and why. The goal is both to stimulate discussion (not much yet), and to document the process so others can benefit. And to take some pleasure in explaining myself – always a good thing.
More pictures and explanations on diyaudio.