Go here : [url=http://www.whatsbestforum.com/showthread.php?9421-Possibly-the-most-frugal-high-end-sounding-amp]Possibly the most frugal high-end sounding amp?[/url]
If you have comments, feedback, critique or improvements and don't want to put it on that thread, feel free to leave it in the comments here.
Here are the first measurements - the Nitro amp being fed by the Ozone DAC with a six-tone multiple, peak digital level -20dB. Peak output power around 100mW in an 8R speaker (connected for this test). It looks from this that the datasheet is a little pessimistic on THD, though here I'm measuring the TDA8566, not the 8561. No measurement graphs are presented in the 8566 DS and the 8561 only has plots for 2R and 4R loads, not 8R.
Schematic now added. BOM here : [URL="https://docs.google.com/spreadsheet/ccc?key=0AspUyZApcGQhdFFiVW1ZZE1pb3ppX2NQN0hiMXgzdHc&usp=sharing"]https://docs.google.com/spreadsheet/ccc?key=0AspUyZApcGQhdFFiVW1ZZE1pb3ppX2NQN0hiMXgzdHc&usp=sharing[/URL]...